Radio frequency circuit control method, radio frequency circuit control system and radio frequency product

Abstract

The invention discloses a radio frequency circuit control method, a radio frequency circuit control system and a radio frequency product. The method comprises the steps that a phase-locked loop of a radio frequency circuit control system inputs pulse waves to a low-pass filter according to the target frequency of a radio frequency circuit and the working frequency output by a voltage-controlled oscillator; the controller controls the connection mode of the control circuit and the low-pass filter according to the target frequency and the working frequency; the connection mode comprises any one of voltage bias connection, discharge connection and disconnection connection; the low-pass filter performs filtering processing on the pulse wave based on a connection mode with the control circuit to obtain a control voltage, and inputs the control voltage to the voltage-controlled oscillator; and the voltage-controlled oscillator outputs the working frequency corresponding to the control voltage based on the control voltage. According to the embodiment of the invention, the efficiency of correcting the frequency of the radio frequency circuit is improved while the additional power consumption of the radio frequency circuit is not increased, and the quick locking of the phase-locked loop in the radio frequency circuit is realized.

Description

Technical Field

[0001] The present application belongs to the field of circuit technology, and specifically relates to a radio frequency circuit control method, a radio frequency circuit control system and a radio frequency product. Background Art

[0002] With the rapid development of science and technology and the continuous improvement of the degree of technological advancement in life, phase-locked loop (PLL) circuits and voltage-controlled oscillator (VCO) circuits play an important role in wireless communications, radio frequency identification (RFID), radar systems, satellite communications, mobile communications and many other fields. Since different application scenarios require the use of different frequencies, when the frequency of the RF product needs to be changed and the frequency change exceeds the capture bandwidth, in order to improve the compatibility of the RF product with different frequency bands, the RF circuit in the RF product needs to be frequency corrected so that the operating frequency of the RF circuit reaches the frequency that needs to be changed, and the phase-locked loop circuit is locked.

[0003] Currently, the frequency correction method for the radio frequency circuit is generally to increase the current of a charge pump to charge and discharge the capacitor in the radio frequency circuit so that the operating frequency of the radio frequency circuit reaches the frequency that needs to be changed.

[0004] However, in actual application scenarios, for RF products with a large frequency band, frequency correction of the RF circuit by increasing the charge pump current not only takes a long time to correct, but also increases the power consumption of the RF product. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a control method for a radio frequency circuit, a radio frequency circuit control system and a radio frequency product, which can solve the problems of long frequency correction time and high power consumption in the process of frequency correction of the radio frequency circuit in the related technology.

[0006] In a first aspect, an embodiment of the present application provides a control method for a radio frequency circuit, which is applied to a radio frequency circuit control system, wherein the radio frequency circuit control system includes a radio frequency circuit and a control circuit; the radio frequency circuit includes a controller, a phase-locked loop, a low-pass filter and a voltage-controlled oscillator; the controller, the phase-locked loop, the low-pass filter and the voltage-controlled oscillator are connected in series in sequence; the voltage-controlled oscillator is also connected to the low-pass filter; the controller is also connected to the control circuit; the method includes:

[0007] The phase-locked loop inputs a pulse wave to the low-pass filter according to the target frequency of the radio frequency circuit and the operating frequency output by the voltage-controlled oscillator;

[0008] The controller controls the connection mode between the control circuit and the low-pass filter according to the target frequency and the operating frequency; the connection mode includes any one of voltage bias connection, discharge connection and disconnection;

[0009] The low-pass filter performs filtering processing on the pulse wave based on the connection mode with the control circuit to obtain a control voltage, and inputs the control voltage into the voltage-controlled oscillator;

[0010] The voltage-controlled oscillator outputs an operating frequency corresponding to the control voltage based on the control voltage.

[0011] Optionally, the control circuit includes a voltage bias circuit and a discharge circuit; the voltage bias circuit is used to provide a bias voltage to the low-pass filter, and the discharge circuit is used to discharge the low-pass filter;

[0012] The controller controls the connection mode between the control circuit and the low-pass filter according to the target frequency and the operating frequency, including:

[0013] When the first frequency value of the operating frequency and the second frequency value of the target frequency are the same, the controller controls the discharge circuit to be disconnected from the low-pass filter, and controls the voltage bias circuit to be disconnected from the low-pass filter;

[0014] When the first frequency value is less than the second frequency value, the controller controls the voltage bias circuit to be connected to the low-pass filter, and controls the discharge circuit to be disconnected from the low-pass filter;

[0015] In a case where the first frequency value is greater than the second frequency value, the controller controls the discharge circuit to be connected to the low-pass filter, and controls the voltage bias circuit to be disconnected from the low-pass filter.

[0016] Optionally, the method further comprises:

[0017] When the radio frequency circuit is turned off, the controller controls the discharge circuit to be connected to the low-pass filter, and controls the voltage bias circuit to be disconnected from the low-pass filter.

[0018] Optionally, the control circuit includes a voltage bias circuit and a discharge circuit;

[0019] The voltage bias circuit includes a first triode, a second triode, a third triode, a metal oxide semiconductor field effect transistor and a power supply; the base of the first triode is connected to the second input and output interface of the controller, the collector of the first triode is connected to the base of the second triode, the collector of the second triode is connected to the base of the third triode, the collector of the third triode is connected to the gate of the metal oxide semiconductor field effect transistor, the source of the metal oxide semiconductor field effect transistor is connected to the low-pass filter, and the drain of the metal oxide semiconductor field effect transistor and the emitter of the third triode are both connected to the power supply;

[0020] The discharge circuit includes a fourth transistor, a fifth transistor and a ground terminal, the base of the fourth transistor is connected to the first input-output interface of the controller, the collector of the fourth transistor is connected to the base of the fifth transistor, the collector of the fifth transistor is connected to the low-pass filter, and the emitter of the fifth transistor is connected to the ground terminal.

[0021] Optionally, when the first frequency value of the operating frequency and the second frequency value of the target frequency are the same, the controller controls the connection mode between the control circuit and the low-pass filter according to the target frequency and the operating frequency, including:

[0022] The controller inputs a high-level control signal to the base of the fourth transistor through the first input-output interface, so as to control the ground terminal in the discharge circuit to be disconnected from the low-pass filter by using the high-level control signal;

[0023] The controller inputs a high-level control signal to the base of the first transistor through the second input-output interface, so as to use the high-level control signal to control the power supply in the voltage bias circuit to be disconnected from the low-pass filter.

[0024] Optionally, when the first frequency value of the operating frequency is less than the second frequency value of the target frequency, the controller controls the connection mode between the control circuit and the low-pass filter according to the target frequency and the operating frequency, including:

[0025] The controller inputs a high-level control signal to the base of the fourth transistor through the first input-output interface, so as to control the ground terminal in the discharge circuit to be disconnected from the low-pass filter by using the high-level control signal;

[0026] The controller inputs a low-level control signal to the base of the first transistor through the second input-output interface, so as to control the power supply in the voltage bias circuit to be connected to the low-pass filter by using the low-level control signal.

[0027] Optionally, when the first frequency value of the operating frequency is greater than the second frequency value of the target frequency, the controller controls the connection mode between the control circuit and the low-pass filter according to the target frequency and the operating frequency, including:

[0028] The controller inputs a low-level control signal to the base of the fourth transistor through the first input-output interface, so as to control the ground terminal in the discharge circuit to be connected to the low-pass filter by using the low-level control signal;

[0029] The controller inputs a high-level control signal to the base of the first transistor through the second input-output interface, so as to use the high-level control signal to control the power supply in the voltage bias circuit to be disconnected from the low-pass filter.

[0030] Optionally, the first transistor, the second transistor, the fourth transistor and the fifth transistor are NPN transistors;

[0031] The third transistor is a PNP transistor.

[0032] Optionally, the method further comprises:

[0033] The controller sends a frequency control signal to the phase-locked loop; the frequency control signal carries the target frequency of the radio frequency circuit.

[0034] Optionally, the phase-locked loop inputs a pulse wave to the low-pass filter according to a target frequency of the radio frequency circuit and an operating frequency output by the voltage-controlled oscillator, comprising:

[0035] The phase-locked loop determines the phase difference between the operating frequency and the target frequency according to the target frequency of the radio frequency circuit and the operating frequency output by the voltage-controlled oscillator;

[0036] The phase-locked loop generates a pulse wave corresponding to the phase difference and inputs the pulse wave to the low-pass filter.

[0037] Optionally, the low-pass filter performs filtering processing on the pulse wave based on a connection mode with the control circuit to obtain a control voltage, including:

[0038] In the case where the connection mode is a voltage bias connection, the low-pass filter performs filtering processing on the pulse wave based on the bias voltage provided by the control circuit to obtain a control voltage;

[0039] When the connection mode is a discharge connection, the low-pass filter is discharged through a control circuit, and the pulse wave is filtered based on the discharge voltage obtained after the discharge to obtain a control voltage;

[0040] When the connection mode is disconnection, the low-pass filter performs filtering processing on the pulse wave based on the current voltage to obtain a control voltage.

[0041] In a second aspect, an embodiment of the present application provides a radio frequency circuit control system, the radio frequency circuit control system comprising a radio frequency circuit and a control circuit; the radio frequency circuit comprises a controller, a phase-locked loop, a low-pass filter and a voltage-controlled oscillator; the controller, the phase-locked loop, the low-pass filter and the voltage-controlled oscillator are sequentially connected in series; the voltage-controlled oscillator is also connected to the low-pass filter; the controller is also connected to the control circuit;

[0042] The phase-locked loop is used to input a pulse wave to the low-pass filter according to the target frequency of the radio frequency circuit and the operating frequency output by the voltage-controlled oscillator;

[0043] The controller is used to control the connection mode between the control circuit and the low-pass filter according to the target frequency and the operating frequency; the connection mode includes any one of voltage bias connection, discharge connection and disconnection;

[0044] The low-pass filter is used to filter the pulse wave based on the connection mode with the control circuit to obtain a control voltage, and input the control voltage to the voltage-controlled oscillator;

[0045] The voltage-controlled oscillator is used to output an operating frequency corresponding to the control voltage based on the control voltage.

[0046] In a third aspect, an embodiment of the present application provides a radio frequency product, which includes the radio frequency circuit control system as described above.

[0047] The control method of the RF circuit provided in the embodiment of the present application is based on the controller, phase-locked loop, low-pass filter, voltage-controlled oscillator and control circuit in the RF circuit control system. According to the target frequency of the RF circuit and the working frequency output by the voltage-controlled oscillator in real time, a pulse wave is input to the low-pass filter through the phase-locked loop, thereby realizing pulse control of the voltage-controlled oscillator; the controller controls the connection mode between the control circuit and the low-pass filter according to the target frequency and the working frequency, so that the low-pass filter can filter the pulse wave based on the connection mode with the control circuit to obtain a control voltage, and input the control voltage to the voltage-controlled oscillator, thereby realizing bias control of the voltage-controlled oscillator; the embodiment of the present application performs pulse control on the voltage-controlled oscillator through the phase-locked loop of the RF circuit control system, and performs bias control on the voltage-controlled oscillator through the controller of the RF circuit control system, while not increasing the extra power consumption of the RF circuit, it also shortens the time for correcting the frequency of the RF circuit, improves the efficiency of correcting the frequency of the RF circuit, and realizes the rapid locking of the phase-locked loop in the RF circuit without generating extra power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 is a flowchart of a method for controlling a radio frequency circuit provided in an embodiment of the present application;

[0049] Figure 2 It is a logic block diagram of a radio frequency circuit control system provided in an embodiment of the present application;

[0050] Figure 3 is a schematic diagram of a pulse wave provided in an embodiment of the present application;

[0051] Figure 4 is a schematic diagram of another pulse wave provided in an embodiment of the present application;

[0052] Figure 5 is a schematic diagram of another pulse wave provided in an embodiment of the present application;

[0053] Figure 6 is a schematic diagram of another pulse wave provided in an embodiment of the present application;

[0054] Figure 7 It is a logic block diagram of another radio frequency circuit control system provided in an embodiment of the present application;

[0055] Figure 8 It is a step flow chart of another method for controlling a radio frequency circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0057] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0058] Method Embodiment

[0059] The control method of the radio frequency circuit provided in the embodiment of the present application is described in detail below through specific embodiments and application scenarios in combination with the accompanying drawings.

[0060] Reference Figure 1 , shows a flowchart of a method for controlling a radio frequency circuit provided in an embodiment of the present application, the method specifically comprising step S101 and step S104:

[0061] Step S101: The phase-locked loop inputs a pulse wave to the low-pass filter according to the target frequency of the radio frequency circuit and the operating frequency output by the voltage-controlled oscillator.

[0062] Step S102: the controller controls the connection mode between the control circuit and the low-pass filter according to the target frequency and the operating frequency; the connection mode includes any one of voltage bias connection, discharge connection and disconnection.

[0063] Step S103: The low-pass filter performs filtering processing on the pulse wave based on the connection mode with the control circuit to obtain a control voltage, and inputs the control voltage to the voltage-controlled oscillator.

[0064] Step S104: the voltage-controlled oscillator outputs an operating frequency corresponding to the control voltage based on the control voltage.

[0065] The control method of the radio frequency circuit provided in the embodiment of the present application can be applied to the radio frequency circuit control system. Figure 2, shows a logic block diagram of a radio frequency circuit control system provided by an embodiment of the present application, such as Figure 2 As shown, the RF circuit control system includes a RF circuit and a control circuit, and the RF circuit includes a controller, a phase-locked loop, a low-pass filter (LPF) and a voltage-controlled oscillator; the controller, the phase-locked loop, the low-pass filter and the voltage-controlled oscillator are connected in series in sequence; the voltage-controlled oscillator is also connected to the low-pass filter; and the controller is also connected to the control circuit.

[0066] Among them, the controller can be a microcontroller unit (MCU); the phase-locked loop (for example, MB15E03SL chip) can include but is not limited to an internal counter (Counter), a prescaler (Prescaler), a phase detector (Phase Detector, PFD) and a charge pump, etc.; the controller and the phase-locked loop communicate through a serial peripheral interface (Serial Peripheral Interface, SPI).

[0067] In an embodiment of the present application, the controller can determine the target frequency corresponding to the RF circuit according to the actual application needs of the RF circuit, and send the target frequency to the phase-locked loop through a communication connection with the phase-locked loop, so that the phase-locked loop can perform the operation corresponding to step S101 based on the target frequency and the operating frequency output by the voltage-controlled oscillator. Specifically, when the RF circuit is powered on and started, the phase-locked loop is in an unlocked state, and the operating frequency output by the voltage-controlled oscillator may be different from the target frequency. The controller can set the target frequency through SPI communication according to the working crystal of the phase-locked loop (such as 16MHz, 8MHz, etc.). Of course, when the operating frequency of the RF circuit needs to jump to a frequency point higher than the current operating frequency, or when the operating frequency of the RF circuit needs to jump to a frequency point lower than the current operating frequency, the controller can also set the target frequency through SPI communication according to the working crystal of the phase-locked loop.

[0068] The phase-locked loop inputs a pulse wave to the low-pass filter according to the target frequency of the RF circuit and the operating frequency output by the voltage-controlled oscillator. Specifically:

[0069] First, the phase-locked loop receives the target frequency sent by the controller through a communication connection with the controller, and obtains the operating frequency output by the voltage-controlled oscillator through a communication connection with the voltage-controlled oscillator; it can be understood that the operating frequency output by the voltage-controlled oscillator is the actual operating frequency of the RF circuit.

[0070] Then, the phase-locked loop uses an internal counter, a frequency divider and a phase detector to determine the difference between the target frequency and the operating frequency according to the target frequency and the operating frequency; wherein the difference between the target frequency and the operating frequency includes a frequency value difference between the target frequency and the operating frequency and a phase difference between the target frequency and the operating frequency.

[0071] Then, the phase-locked loop inputs a pulse wave corresponding to the phase difference between the target frequency and the operating frequency to the low-pass filter through the charge pump, so that the low-pass filter performs the operation corresponding to step S103; Figure 3 , showing a schematic diagram of a pulse wave provided in an embodiment of the present application, the phase-locked loop adjusts the phase difference between the target frequency and the operating frequency by inputting a pulse wave into a low-pass filter, so that the phase of the operating frequency of the RF circuit gradually approaches the phase of the target frequency.

[0072] Specifically, in the scenario where the operating frequency of the RF circuit is fixed at a certain frequency point and operates normally, the phase difference between the target frequency determined by the phase-locked loop in step S101 and the operating frequency is zero or close to zero; at this time, refer to Figure 4 , shows a schematic diagram of another pulse wave provided in an embodiment of the present application, in which the phase-locked loop inputs a nearly constant pulse wave to the low-pass filter through a charge pump.

[0073] In the scenario where the operating frequency of the RF circuit needs to jump to a frequency point higher than the current operating frequency, the phase difference between the target frequency determined by the phase-locked loop in step S101 and the operating frequency becomes larger in the positive direction; at this time, refer to Figure 5 , shows a schematic diagram of another pulse wave provided in an embodiment of the present application, in which the phase-locked loop inputs more pulse waves to the low-pass filter through the charge pump, so that the control voltage input by the low-pass filter to the voltage-controlled oscillator increases, so as to gradually adjust the phase of the operating frequency output by the voltage-controlled oscillator to the same as the phase of the target frequency.

[0074] In the scenario where the operating frequency of the RF circuit needs to jump to a frequency point lower than the current operating frequency, the phase difference between the target frequency determined by the phase-locked loop in step S101 and the operating frequency becomes larger in the opposite direction; at this time, refer to Figure 6 , shows a schematic diagram of another pulse wave provided in an embodiment of the present application, in which the phase-locked loop inputs fewer pulse waves to the low-pass filter through the charge pump, so that the control voltage input by the low-pass filter to the voltage-controlled oscillator is reduced, so as to gradually adjust the phase of the operating frequency output by the voltage-controlled oscillator to the same as the phase of the target frequency.

[0075] In the scenario where the RF circuit is shut down, the controller will stop controlling the phase-locked loop, the phase-locked loop will lose lock, the RF circuit will be powered off, and the pulse wave input to the low-pass filter by the phase-locked loop through the charge pump will gradually decrease, causing the control voltage input to the voltage-controlled oscillator by the low-pass filter to decrease, thereby gradually reducing the operating frequency output by the voltage-controlled oscillator to zero.

[0076] It should be noted that in step S101, the phase-locked loop inputs a pulse wave to the low-pass filter according to the target frequency and the operating frequency output by the voltage-controlled oscillator, which is a pulse control of the voltage-controlled oscillator, so that the phase of the operating frequency output by the voltage-controlled oscillator is consistent with the phase of the target frequency; and in step S102, the controller controls the connection between the control circuit and the low-pass filter according to the target frequency and the operating frequency, which is a bias control of the voltage-controlled oscillator, so that the frequency value of the operating frequency output by the voltage-controlled oscillator is consistent with the frequency value of the target frequency. The RF circuit control system combines the pulse control and bias control of the voltage-controlled oscillator to jointly realize the process of adjusting the operating frequency output by the voltage-controlled oscillator to the target frequency.

[0077] Among them, during the process of pulse control of the voltage-controlled oscillator, the phase-locked loop gradually adjusts the phase of the operating frequency output by the voltage-controlled oscillator to the same phase as the target frequency, and at the same time, the frequency value of the operating frequency output by the voltage-controlled oscillator gradually approaches the frequency value of the target frequency. However, this process is slow and takes a long time. In the embodiment of the present application, combined with the bias control of the voltage-controlled oscillator by the controller, the process of adjusting the frequency value of the operating frequency to the frequency value of the target frequency can be accelerated, so that the operating frequency output by the voltage-controlled oscillator can be adjusted to the target operating frequency more quickly, thereby improving the efficiency of correcting the frequency of the RF circuit.

[0078] In the embodiment of the present application, the controller controls the connection mode between the control circuit and the low-pass filter according to the target frequency and the operating frequency, specifically:

[0079] First, the controller determines the target frequency corresponding to the RF circuit according to the actual application requirements of the RF circuit, and obtains the operating frequency output by the voltage-controlled oscillator from the phase-locked loop through a communication connection with the phase-locked loop.

[0080] Then, the controller determines a frequency value difference between the target frequency and the operating frequency according to the target frequency and the operating frequency.

[0081] Then, the controller sends a circuit control signal to the control circuit according to the frequency value difference between the target frequency and the operating frequency, so as to control the connection mode between the control circuit and the low-pass filter through the circuit control signal; in the embodiment of the present application, the connection mode between the control circuit and the low-pass filter includes any one of a voltage bias connection, a discharge connection and a disconnection; the voltage bias connection is used to provide a bias voltage to the low-pass filter through the control circuit to increase the loop voltage of the low-pass filter; the discharge connection is used to discharge the low-pass filter through the control circuit to reduce the loop voltage of the low-pass filter; the disconnection refers to controlling the control circuit to disconnect from the low-pass filter, at which time, the control circuit will not control the loop voltage of the low-pass filter.

[0082] Specifically, in a scenario where the operating frequency of the RF circuit is fixed at a certain frequency point and operates normally, the second frequency value of the target frequency is approximately equal to the first frequency value of the operating frequency, and there is no need to adjust the operating frequency currently output by the voltage-controlled oscillator. In this scenario, in step S102, the controller can control the connection between the control circuit and the low-pass filter to be disconnected through a circuit control signal.

[0083] In a scenario where the operating frequency of the RF circuit needs to jump to a frequency point higher than the current operating frequency, the second frequency value of the target frequency is greater than the first frequency value of the operating frequency, and the first frequency value of the operating frequency currently output by the voltage-controlled oscillator needs to be increased to the second frequency value of the target frequency. In this scenario, in step S102, the controller can control the connection between the control circuit and the low-pass filter to be a voltage bias connection through a circuit control signal, so as to provide a bias voltage to the low-pass filter through the control circuit, thereby increasing the loop voltage of the low-pass filter, and further increasing the control voltage input from the low-pass filter to the voltage-controlled oscillator, so that the first frequency value of the operating frequency output by the voltage-controlled oscillator can be increased to the second frequency value of the target frequency more quickly.

[0084] In a scenario where the operating frequency of the RF circuit needs to jump to a frequency point lower than the current operating frequency, the second frequency value of the target frequency is less than the first frequency value of the operating frequency, and the first frequency value of the operating frequency currently output by the voltage-controlled oscillator needs to be reduced to the second frequency value of the target frequency. In this scenario, in step S102, the controller can control the connection between the control circuit and the low-pass filter to be a discharge connection through a circuit control signal, so as to discharge the low-pass filter through the control circuit, thereby reducing the loop voltage of the low-pass filter, and further reducing the control voltage input from the low-pass filter to the voltage-controlled oscillator, so that the first frequency value of the operating frequency output by the voltage-controlled oscillator can be reduced to the second frequency value of the target frequency more quickly.

[0085] In an optional embodiment, after determining the frequency value difference between the target frequency and the operating frequency, the phase-locked loop can also send the frequency value difference between the target frequency and the operating frequency to the controller through a communication connection with the controller, so that the controller can directly control the connection method between the control circuit and the low-pass filter according to the frequency value difference between the target frequency and the operating frequency.

[0086] In an embodiment of the present application, after the phase-locked loop inputs a pulse wave to the low-pass filter and the controller controls the connection method between the control circuit and the low-pass filter, the low-pass filter in the RF circuit control system can filter the pulse wave based on the connection method with the control circuit, obtain a control voltage, and input the control voltage to the voltage-controlled oscillator.

[0087] Specifically, a cut-off frequency of the pulse wave is set in the low-pass filter. The low-pass filter can filter out high-frequency noise of the pulse wave input to the phase-locked loop based on the cut-off frequency to form a voltage level (VoltageLevel), and determine the voltage level as the control voltage.

[0088] It should be noted that when the connection method between the control circuit and the low-pass filter is a voltage bias connection, a bias voltage is provided to the low-pass filter through the control circuit, so that the loop voltage of the low-pass filter increases. When the cutoff frequency of the filter remains unchanged, the purpose of increasing the control voltage obtained by the low-pass filter is achieved, thereby increasing the frequency value of the operating frequency output by the voltage-controlled oscillator.

[0089] When the control circuit and the low-pass filter are connected in a discharge connection, the low-pass filter is discharged through the control circuit, so that the loop voltage of the low-pass filter is reduced. When the cutoff frequency of the filter remains unchanged, the purpose of reducing the control voltage obtained by the low-pass filter is achieved, thereby reducing the frequency value of the operating frequency output by the voltage-controlled oscillator.

[0090] When the control circuit and the low-pass filter are disconnected, the control circuit does not control the voltage of the low-pass filter. The low-pass filter can filter the pulse wave based on the current loop voltage. By inputting a control voltage corresponding to the current loop voltage into the voltage-controlled oscillator, the operating frequency output by the voltage-controlled oscillator can be kept stable, thereby improving the stability of the RF circuit during normal operation.

[0091] It can be understood that a voltage-controlled oscillator is an oscillation circuit whose output frequency and input control voltage are in a positive correspondence relationship; in the embodiment of the present application, the pulse wave input to the low-pass filter is controlled by a phase-locked loop, and the loop voltage of the low-pass filter is controlled by a controller using a control circuit, thereby controlling the control voltage input from the low-pass filter to the voltage-controlled oscillator, thereby controlling the operating frequency of the voltage-controlled oscillator output, and efficiently adjusting the operating frequency of the voltage-controlled oscillator output to the target frequency.

[0092] When the operating frequency output by the voltage-controlled oscillator is adjusted to the target frequency, the difference between the operating frequency output by the voltage-controlled oscillator and the target frequency is close to zero, and the phase-locked loop in the RF circuit will be in a locked state. It should be noted that adjusting the operating frequency output by the voltage-controlled oscillator to the target frequency means: adjusting the phase of the operating frequency to be the same as the phase of the target frequency through pulse control, and adjusting the frequency value of the operating frequency to be the same as the frequency value of the target frequency through bias control.

[0093] In summary, the control method of the RF circuit provided in the embodiment of the present application performs pulse control on the voltage-controlled oscillator through the phase-locked loop of the RF circuit control system, and performs bias control on the voltage-controlled oscillator through the controller of the RF circuit control system. This shortens the time for correcting the frequency of the RF circuit without increasing the extra power consumption of the RF circuit, improves the efficiency of correcting the frequency of the RF circuit, and realizes rapid locking of the phase-locked loop in the RF circuit without incurring extra power consumption overhead.

[0094] Optionally, the control circuit includes a voltage bias circuit and a discharge circuit; the voltage bias circuit is used to provide a bias voltage to the low-pass filter, and the discharge circuit is used to discharge the low-pass filter; step S102, the controller controls the connection mode between the control circuit and the low-pass filter according to the target frequency and the operating frequency, including steps S1021 to S1023:

[0095] Step S1021: When the first frequency value of the operating frequency and the second frequency value of the target frequency are the same, the controller controls the discharge circuit to be disconnected from the low-pass filter, and controls the voltage bias circuit to be disconnected from the low-pass filter.

[0096] Step S1022: When the first frequency value is less than the second frequency value, the controller controls the voltage bias circuit to be connected to the low-pass filter, and controls the discharge circuit to be disconnected from the low-pass filter.

[0097] Step S1023: When the first frequency value is greater than the second frequency value, the controller controls the discharge circuit to be connected to the low-pass filter, and controls the voltage bias circuit to be disconnected from the low-pass filter.

[0098] In an embodiment of the present application, the control circuit includes a voltage bias circuit and a discharge circuit; wherein the voltage bias circuit is used to provide a bias voltage to the low-pass filter, and the discharge circuit is used to discharge the low-pass filter.

[0099] Specifically, in a scenario where the operating frequency of the RF circuit is fixed at a certain frequency point and operates normally, the first frequency value of the operating frequency output by the voltage-controlled oscillator is the same as the second frequency value of the target frequency. The controller executes step S1021 to control the discharge circuit to disconnect from the low-pass filter, and controls the voltage bias circuit to disconnect from the low-pass filter, so that the connection mode between the control circuit and the low-pass filter is disconnected. In this scenario, there is no need to adjust the operating frequency currently output by the voltage-controlled oscillator, that is, there is no need to adjust the voltage of the low-pass filter through the control circuit.

[0100] In a scenario where the operating frequency of the RF circuit needs to jump to a frequency point higher than the current operating frequency, the first frequency value of the operating frequency output by the voltage-controlled oscillator is less than the second frequency value of the target frequency. The controller executes step S1022 to control the voltage bias circuit to be connected to the low-pass filter, and controls the discharge circuit to be disconnected from the low-pass filter, so that the connection method between the control circuit and the low-pass filter is a voltage bias connection. In this scenario, it is necessary to increase the first frequency value of the operating frequency currently output by the voltage-controlled oscillator to the second frequency value of the target frequency, that is, it is necessary to provide a bias voltage to the low-pass filter through the voltage bias circuit in the control circuit, so that the loop voltage of the low-pass filter is increased, and then the control voltage input from the low-pass filter to the voltage-controlled oscillator is increased, so that the first frequency value of the operating frequency output by the voltage-controlled oscillator can be increased to the second frequency value of the target frequency more quickly.

[0101] In a scenario where the operating frequency of the RF circuit needs to jump to a frequency point lower than the current operating frequency, the first frequency value of the operating frequency output by the voltage-controlled oscillator is greater than the second frequency value of the target frequency. The controller executes step S1023 to control the discharge circuit to be connected to the low-pass filter, and controls the voltage bias circuit to be disconnected from the low-pass filter, so that the connection mode between the control circuit and the low-pass filter is a discharge connection. In this scenario, it is necessary to reduce the first frequency value of the operating frequency currently output by the voltage-controlled oscillator to the second frequency value of the target frequency, that is, it is necessary to discharge the low-pass filter through the discharge circuit in the control circuit, so that the loop voltage of the low-pass filter is reduced, and then the control voltage input from the low-pass filter to the voltage-controlled oscillator is reduced, so that the first frequency value of the operating frequency output by the voltage-controlled oscillator can be reduced to the second frequency value of the target frequency more quickly.

[0102] The control method of the RF circuit provided in the embodiment of the present application can realize the disconnection, voltage bias connection and discharge connection of the control circuit and the low-pass filter based on the voltage bias circuit and the discharge circuit of the control circuit. The frequency of the RF circuit can be corrected in application scenarios where the operating frequency of the RF circuit is fixed at a certain frequency point to work normally, the operating frequency of the RF circuit needs to jump to a frequency point higher than the current operating frequency, and the operating frequency of the RF circuit needs to jump to a frequency point lower than the current operating frequency. This shortens the time for correcting the frequency of the RF circuit, improves the efficiency of correcting the frequency of the RF circuit, and expands the application scope of the embodiment of the present application.

[0103] Optionally, the method further includes step S1024:

[0104] Step S1024: When the RF circuit is turned off, the controller controls the discharge circuit to be connected to the low-pass filter, and controls the voltage bias circuit to be disconnected from the low-pass filter.

[0105] In an embodiment of the present application, when the RF circuit is shut down, the controller can control the discharge circuit to be connected to the low-pass filter based on the voltage bias circuit and the discharge circuit of the control circuit, and control the voltage bias circuit to be disconnected from the low-pass filter, so that the connection mode between the control circuit and the low-pass filter is a discharge connection; when the RF circuit is shut down, the controller controls the connection mode between the control circuit and the low-pass filter to be a discharge connection through step S1024, so that the low-pass filter can be discharged through the discharge circuit and quickly restored to the starting state of the RF circuit to avoid affecting the next power-on operation of the RF circuit, thereby improving the feasibility of the embodiment of the present application.

[0106] Optionally, refer to Figure 7 , shows a logic block diagram of another radio frequency circuit control system provided in an embodiment of the present application; Figure 7 As shown, the control circuit includes a voltage bias circuit and a discharge circuit. The voltage bias circuit includes a first transistor (Q 1 )、The second transistor (Q 2 )、The third transistor (Q 3 ), metal oxide semiconductor field effect transistor (Q 6 ) and a power supply (VDD); the base of the first transistor is connected to the second input-output interface (PA2) of the controller, the collector of the first transistor is connected to the base of the second transistor, the collector of the second transistor is connected to the base of the third transistor, the collector of the third transistor is connected to the gate of the metal oxide semiconductor field effect transistor, the source of the metal oxide semiconductor field effect transistor is connected to the low-pass filter, and the drain of the metal oxide semiconductor field effect transistor and the emitter of the third transistor are both connected to the power supply.

[0107] The discharge circuit includes a fourth transistor (Q 4 )、The fifth transistor (Q 5 ) and the ground terminal, the base of the fourth transistor is connected to the first input-output interface (PA2) of the controller, the collector of the fourth transistor is connected to the base of the fifth transistor, the collector of the fifth transistor is connected to the low-pass filter, and the emitter of the fifth transistor is connected to the ground terminal.

[0108] The first input / output interface and the second input / output interface are both general-purpose input / output (GPIO) interfaces of the controller.

[0109] The triode includes a base (Base, B), a collector (Collector, C) and an emitter (Emitter, E); the base regulates the current between the collector and the emitter through control, the collector is responsible for outputting the amplified current, and the emitter provides current input and maintains a forward bias state. The Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) includes a gate (Gate, G), a source (S) and a drain (Drain, D); the gate is the electrode for controlling the signal input, and the source and drain are the inflow and outflow ends of the current.

[0110] It should be noted that the related technology also includes a method of increasing the bandwidth of the low-pass filter loop for frequency correction of the RF circuit, but the method of increasing the bandwidth of the low-pass filter loop is equivalent to changing the design of the RF circuit, and requires the addition of additional circuits, thereby increasing the area of ​​the printed circuit board (PCB) and increasing the cost of frequency correction of the RF circuit; in the embodiment of the present application, the voltage bias circuit and discharge circuit of the control circuit in the RF circuit control system are composed of a triode, a metal oxide semiconductor field effect transistor, and a power supply. On the basis of the RF circuit, fewer devices are added, and the devices that constitute the control circuit are all general devices with low cost. The bias circuit and the discharge circuit can be adjusted according to actual use requirements, so that the bias circuit can provide a bias voltage to the low-pass filter, and the discharge circuit can discharge the low-pass filter. It has high flexibility and low circuit cost, and can enable the RF circuit to achieve a fast locking effect; and the RF circuit control system in the embodiment of the present application has the advantages of high integration and compact structure.

[0111] Optionally, refer to Figure 7 The voltage bias circuit may further include a first resistor (R 1 )、Second resistor (R 2 )、The third resistor (R 3 )、The fourth resistor (R 4 )、The fifth resistor (R 5 )、The ninth resistor (R 9 )、The tenth resistor (R 10 )、Capacitance(C 1 ), the supply voltage terminal (VCC) and the ground terminal.

[0112] Among them, the first resistor is connected in series between the second input and output interface of the controller and the base of the first transistor; the second resistor is connected in series between the collector of the first transistor and the base of the second transistor; the third resistor is connected in series between the collector of the first transistor and the power supply voltage end; the fourth resistor is connected in series between the collector of the second transistor and the base of the third transistor; the fifth resistor is connected in series between the collector of the third transistor and the gate of the metal oxide semiconductor field effect transistor; the ninth resistor is connected in series between the source of the metal oxide semiconductor field effect transistor and the low-pass filter; the tenth resistor is connected in parallel with the base and emitter of the third transistor; the emitter of the first transistor, the emitter of the second transistor, the power supply and the ground terminal are connected, and a capacitor is connected in series between the power supply and the ground terminal.

[0113] In an optional embodiment, Figure 7At least one of the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, the ninth resistor, and the tenth resistor in the medium voltage bias circuit is a variable resistor to control the magnitude of the bias voltage provided by the voltage bias circuit to the low-pass filter, thereby achieving precise control of the bias voltage and improving the accuracy of the RF circuit control system in the embodiment of the present application in the process of controlling the RF circuit.

[0114] Optionally, refer to Figure 7 The discharge circuit may further include a sixth resistor (R 6 )、The seventh resistor (R 7 )、The eighth resistor (R 8 ) and the power supply voltage terminal. Among them, the sixth resistor is connected in series between the first input / output interface of the controller and the base of the fourth triode; the seventh resistor is connected in series between the collector of the fourth triode and the base of the fifth triode; the eighth resistor is connected in series between the power supply voltage terminal and the collector of the fourth triode; the emitter of the fourth triode and the emitter of the fifth triode are connected to the ground terminal.

[0115] In an optional embodiment, Figure 7 At least one of the sixth resistor, the seventh resistor, and the eighth resistor in the discharge circuit is a variable resistor to control the discharge speed of the low-pass filter through the discharge circuit, thereby improving the accuracy of the RF circuit control system in the embodiment of the present application in the process of controlling the RF circuit.

[0116] Optionally, the first transistor, the second transistor, the fourth transistor and the fifth transistor in the control circuit are all NPN transistors; and the third transistor is a PNP transistor.

[0117] Optionally, when the first frequency value of the operating frequency and the second frequency value of the target frequency are the same, the controller in step S102 controls the connection mode between the control circuit and the low-pass filter according to the target frequency and the operating frequency, including steps A11 to A12:

[0118] Step A11: The controller inputs a high-level control signal to the base of the fourth transistor through the first input-output interface, so as to use the high-level control signal to control the ground terminal in the discharge circuit to be disconnected from the low-pass filter.

[0119] Step A12: the controller inputs a high-level control signal to the base of the first transistor through the second input-output interface, so as to use the high-level control signal to control the power supply in the voltage bias circuit to disconnect from the low-pass filter.

[0120] The circuit control signal sent by the controller to the control circuit may include a high-level control signal and a low-level control signal.

[0121] In an embodiment of the present application, when the first frequency value of the operating frequency and the second frequency value of the target frequency are the same, the controller needs to control the discharge circuit to be disconnected from the low-pass filter, and control the voltage bias circuit to be disconnected from the low-pass filter.

[0122] Specifically, the first transistor, the second transistor, the fourth transistor and the fifth transistor in the control circuit are all NPN transistors; the third transistor is a PNP transistor; and the metal oxide semiconductor field effect transistor is an N type.

[0123] Reference Figure 7 , when the first frequency value of the operating frequency and the second frequency value of the target frequency are the same, in order to control the discharge circuit to be disconnected from the low-pass filter, the controller can input a high-level control signal to the base of the fourth transistor through the first input-output interface; it can be seen from the transistor characteristics that when a high-level control signal is input to the base of the fourth transistor, the fourth transistor is turned on, and the collector of the fourth transistor is at a low level; it can be inferred that the base of the fifth transistor is at a low level, and the fifth transistor is cut off, so that the ground terminal in the discharge circuit is disconnected from the low-pass filter, thereby achieving the purpose of disconnecting the discharge circuit from the low-pass filter.

[0124] To control the voltage bias circuit to disconnect from the low-pass filter, the controller can input a high-level control signal to the base of the first transistor through the second input-output interface; from the transistor characteristics, when a high-level control signal is input to the base of the first transistor, the first transistor is turned on, and the collector of the first transistor is at a low level; it can be inferred that the base of the second transistor is at a low level, and the second transistor is cut off; if the collector of the second transistor is at a high level, the base of the third transistor is also at a high level, and the third transistor is cut off; if the collector of the third transistor is at a low level, the gate of the metal oxide semiconductor field effect transistor is also at a low level, and the metal oxide semiconductor field effect transistor is cut off, so that the power supply in the voltage bias circuit is disconnected from the low-pass filter, and the power supply cannot provide a bias voltage to the low-pass filter through the metal oxide semiconductor field effect transistor, thereby achieving the purpose of disconnecting the voltage bias circuit from the low-pass filter. In this scenario, the loop voltage of the low-pass filter continues to maintain the reference voltage of the currently locked frequency point.

[0125] Optionally, when the first frequency value of the operating frequency is less than the second frequency value of the target frequency, the controller in step S102 controls the connection mode between the control circuit and the low-pass filter according to the target frequency and the operating frequency, including steps A21 to A22:

[0126] Step A21, the controller inputs a high-level control signal to the base of the fourth transistor through the first input-output interface, so as to use the high-level control signal to control the ground terminal in the discharge circuit to be disconnected from the low-pass filter.

[0127] Step A22: the controller inputs a low-level control signal to the base of the first transistor through the second input-output interface, so as to use the low-level control signal to control the power supply in the voltage bias circuit to be connected to the low-pass filter.

[0128] In an embodiment of the present application, when the first frequency value of the operating frequency is less than the second frequency value of the target frequency, the controller needs to control the voltage bias circuit to be connected to the low-pass filter, and control the discharge circuit to be disconnected from the low-pass filter.

[0129] Specifically, the first transistor, the second transistor, the fourth transistor and the fifth transistor in the control circuit are all NPN transistors; the third transistor is a PNP transistor; and the metal oxide semiconductor field effect transistor is an N type.

[0130] Reference Figure 7 , when the first frequency value of the operating frequency is less than the second frequency value of the target frequency, in order to control the voltage bias circuit to be connected to the low-pass filter, the controller can input a low-level control signal to the base of the first transistor through the second input-output interface. It can be seen from the transistor characteristics that when the low-level control signal is input to the base of the first transistor, the first transistor is cut off, and the collector of the first transistor is at a high level; it can be inferred that the base of the second transistor is at a high level, and the second transistor is turned on; the collector of the second transistor is at a low level, then the base of the third transistor is also at a low level, and the third transistor is turned on; the collector of the third transistor is at a high level, then the gate of the metal oxide semiconductor field effect transistor is also at a high level, and the metal oxide semiconductor field effect transistor is turned on, so that the power supply in the voltage bias circuit is connected to the low-pass filter, and the power supply can provide a bias voltage to the low-pass filter through the metal oxide semiconductor field effect transistor, thereby achieving the purpose of connecting the voltage bias circuit to the low-pass filter. In this scenario, a bias voltage is provided to the low-pass filter through a voltage bias circuit in the control circuit, so that the loop voltage of the low-pass filter increases, thereby increasing the control voltage input from the low-pass filter to the voltage-controlled oscillator, thereby more quickly increasing the first frequency value of the operating frequency output by the voltage-controlled oscillator to the second frequency value of the target frequency.

[0131] When the first frequency value of the operating frequency is less than the second frequency value of the target frequency, in order to control the discharge circuit to be disconnected from the low-pass filter, the controller can input a high-level control signal to the base of the fourth transistor through the first input-output interface to cut off the fifth transistor, thereby disconnecting the ground terminal in the discharge circuit from the low-pass filter, thereby achieving the purpose of disconnecting the discharge circuit from the low-pass filter.

[0132] Optionally, when the first frequency value of the operating frequency is greater than the second frequency value of the target frequency, the controller in step S102 controls the connection mode between the control circuit and the low-pass filter according to the target frequency and the operating frequency, including steps A31 to A32:

[0133] Step A31, the controller inputs a low-level control signal to the base of the fourth transistor through the first input-output interface, so as to use the low-level control signal to control the ground terminal in the discharge circuit to be connected to the low-pass filter.

[0134] Step A32: the controller inputs a high-level control signal to the base of the first transistor through the second input-output interface, so as to use the high-level control signal to control the power supply in the voltage bias circuit to disconnect from the low-pass filter.

[0135] In an embodiment of the present application, when the first frequency value of the operating frequency is greater than the second frequency value of the target frequency, the controller needs to control the discharge circuit to be connected to the low-pass filter, and control the voltage bias circuit to be disconnected from the low-pass filter.

[0136] Specifically, the first transistor, the second transistor, the fourth transistor and the fifth transistor in the control circuit are all NPN transistors; the third transistor is a PNP transistor; and the metal oxide semiconductor field effect transistor is an N type.

[0137] Reference Figure 7 , when the first frequency value of the operating frequency is greater than the second frequency value of the target frequency, in order to control the connection between the discharge circuit and the low-pass filter, the controller can input a low-level control signal to the base of the fourth transistor through the first input-output interface. It can be seen from the transistor characteristics that when the low-level control signal is input to the base of the fourth transistor, the fourth transistor is cut off, and the collector of the fourth transistor is at a high level; it can be inferred that the base of the fifth transistor is at a high level, the fifth transistor is turned on, and the low-pass filter is connected to the ground terminal through the fifth transistor, so that the loop voltage of the low-pass filter is rapidly reduced, thereby reducing the control voltage input from the low-pass filter to the voltage-controlled oscillator, so that the first frequency value of the operating frequency output by the voltage-controlled oscillator can be reduced to the second frequency value of the target frequency more quickly.

[0138] In order to control the voltage bias circuit to be disconnected from the low-pass filter, the controller can input a high-level control signal to the base of the first transistor through the second input-output interface to cut off the metal oxide semiconductor field effect transistor, thereby disconnecting the power supply in the voltage bias circuit from the low-pass filter. The power supply cannot provide a bias voltage to the low-pass filter through the metal oxide semiconductor field effect transistor, thereby achieving the purpose of disconnecting the voltage bias circuit from the low-pass filter.

[0139] Optionally, in the scenario where the RF circuit is shut down, the controller can control the discharge circuit to be connected to the low-pass filter and control the voltage bias circuit to be disconnected from the low-pass filter in the same way as steps A31 to A32, so that the low-pass filter can be discharged through the discharge circuit and quickly restored to the starting state of the RF circuit to avoid affecting the next power-on operation of the RF circuit.

[0140] The control method of the RF circuit provided in the embodiment of the present application is a controller that controls the connection method between the control circuit and the low-pass filter based on electronic devices that constitute a voltage bias circuit and a discharge circuit in different application scenarios. While shortening the time for correcting the frequency of the RF circuit and improving the efficiency of correcting the frequency of the RF circuit, it also reduces the cost of correcting the frequency of the RF circuit and improves the flexibility of correcting the frequency of the RF circuit.

[0141] Optionally, the method further comprises:

[0142] Step B11: The controller sends a frequency control signal to the phase-locked loop; the frequency control signal carries the target frequency of the radio frequency circuit.

[0143] In an embodiment of the present application, before step S101, the controller may first determine the target frequency corresponding to the RF circuit according to the actual application requirements of the RF circuit, and then generate a control signal for the phase-locked loop based on the target frequency, and send the control signal carrying the target frequency to the phase-locked loop through a communication connection with the phase-locked loop, so that the phase-locked loop can perform the operation corresponding to step S101 based on the target frequency carried in the control signal and the operating frequency output by the voltage-controlled oscillator.

[0144] Optionally, in step S101, the phase-locked loop inputs a pulse wave to the low-pass filter according to the target frequency of the radio frequency circuit and the operating frequency output by the voltage-controlled oscillator, including steps S1011 to S1012:

[0145] Step S1011: The phase-locked loop determines a phase difference between the operating frequency and the target frequency according to the target frequency of the radio frequency circuit and the operating frequency output by the voltage-controlled oscillator.

[0146] Step S1012: the phase-locked loop generates a pulse wave corresponding to the phase difference, and inputs the pulse wave to the low-pass filter.

[0147] In an embodiment of the present application, in the process of inputting a pulse wave into a low-pass filter according to the target frequency of the RF circuit and the operating frequency output by the voltage-controlled oscillator, the phase-locked loop can first determine the phase difference between the operating frequency and the target frequency according to the target frequency of the RF circuit and the operating frequency output by the voltage-controlled oscillator using a phase detector, and then generate a pulse wave corresponding to the phase difference according to the phase difference between the operating frequency and the target frequency, and input the pulse wave into the low-pass filter through a communication connection with the low-pass filter, so as to use the pulse wave to control the phase of the operating frequency of the RF circuit to gradually approach the phase of the target frequency.

[0148] Optionally, in step S104, the low-pass filter performs filtering processing on the pulse wave based on the connection mode with the control circuit to obtain the control voltage, including steps S1041 to S1043:

[0149] Step S1041: When the connection mode is a voltage bias connection, the low-pass filter filters the pulse wave based on the bias voltage provided by the control circuit to obtain a control voltage.

[0150] Specifically, when the connection between the control circuit and the low-pass filter is a voltage bias connection, the control circuit can provide a bias voltage to the low-pass filter, so that the loop voltage of the low-pass filter increases, and when the cutoff frequency of the filter remains unchanged, the purpose of increasing the control voltage obtained by the low-pass filter is achieved, thereby increasing the frequency value of the operating frequency output by the voltage-controlled oscillator. In this scenario, the low-pass filter can filter the pulse wave based on the bias voltage provided by the control circuit to obtain the control voltage.

[0151] Step S1042: when the connection mode is a discharge connection, the low-pass filter is discharged through a control circuit, and the pulse wave is filtered based on the discharge voltage obtained after the discharge to obtain a control voltage.

[0152] Specifically, when the connection between the control circuit and the low-pass filter is a discharge connection, the low-pass filter can be discharged through the control circuit, so that the loop voltage of the low-pass filter is reduced, and the purpose of reducing the control voltage obtained by the low-pass filter is achieved when the cut-off frequency of the filter remains unchanged, thereby reducing the frequency value of the operating frequency output by the voltage-controlled oscillator. In this scenario, the low-pass filter can be discharged through the control circuit, and the pulse wave can be filtered based on the discharge voltage obtained after the discharge to obtain the control voltage.

[0153] Step S1043: When the connection mode is disconnection, the low-pass filter performs filtering processing on the pulse wave based on the current voltage to obtain a control voltage.

[0154] Specifically, when the connection between the control circuit and the low-pass filter is disconnected, the control circuit does not control the voltage of the low-pass filter, and the low-pass filter can filter the pulse wave based on the current loop voltage. By inputting the control voltage corresponding to the current loop voltage to the voltage-controlled oscillator, the operating frequency output by the voltage-controlled oscillator can be kept stable, thereby improving the stability of the RF circuit during normal operation. In this scenario, the low-pass filter can filter the pulse wave based on the current voltage to obtain the control voltage.

[0155] As an example, see Figure 8 , shows a flowchart of the steps of another method for controlling a radio frequency circuit provided in an embodiment of the present application; Figure 8 As shown, the method may include the following steps S201 to S211:

[0156] Step S201: Power on the radio frequency circuit.

[0157] Step S202: The radio frequency circuit operates.

[0158] Step S203: whether to adjust the frequency band.

[0159] Specifically, the controller can determine the target frequency corresponding to the RF circuit according to the actual application requirements of the RF circuit, and determine whether the operating frequency output by the voltage-controlled oscillator is the same as the target frequency. If the operating frequency and the target frequency are the same, step S202 is continued; if the operating frequency and the target frequency are not the same, step S204 is executed.

[0160] Step S204: whether it is a high-pitched frequency band.

[0161] Specifically, when the operating frequency and the target frequency are not the same, the controller can determine the size relationship between the first frequency value of the operating frequency and the second frequency value of the target frequency. When the first frequency value is less than the second frequency value, it is determined that a high-adjustment frequency band is required, and step S205 is executed; when the first frequency value is not less than the second frequency value, step S208 is executed.

[0162] Step S205: The first input / output interface outputs a high-level control signal, and the second input / output interface outputs a low-level control signal.

[0163] Specifically, when the first frequency value is less than the second frequency value, the frequency band needs to be adjusted high. The controller can input a high-level control signal to the base of the fourth transistor through the first input-output interface to control the ground terminal in the discharge circuit to disconnect from the low-pass filter using the high-level control signal, and input a low-level control signal to the base of the first transistor through the second input-output interface to control the power supply in the voltage bias circuit to connect to the low-pass filter using the low-level control signal, thereby realizing the voltage bias connection between the control circuit and the low-pass filter.

[0164] Step S206: The low-pass filter outputs a control voltage.

[0165] Specifically, the low-pass filter performs filtering processing on the pulse wave input by the phase-locked loop based on the bias voltage provided by the control circuit to obtain the control voltage.

[0166] Step S207: Check whether the control voltage is stable.

[0167] Specifically, when the control voltage output by the low-pass filter is stable, the low-pass filter can execute step S202 to input the control voltage into the voltage-controlled oscillator, so that the voltage-controlled oscillator outputs an operating frequency corresponding to the control voltage, until the operating frequency output by the voltage-controlled oscillator is adjusted to the target frequency, the difference between the operating frequency output by the voltage-controlled oscillator and the target frequency is close to zero, and the phase-locked loop in the RF circuit will be in a locked state.

[0168] When the control voltage output by the low-pass filter is unstable, the low-pass filter may repeatedly execute step S206 until the control voltage is stable.

[0169] Step S208: Whether it is a low-frequency band.

[0170] Specifically, when the first frequency value is not less than the second frequency value, the controller can determine whether the first frequency value is greater than the second frequency value, and when the first frequency value is greater than the second frequency value, it is determined that the frequency band needs to be lowered, and step S209 is executed; when the first frequency value is equal to the second frequency value, it is determined that the frequency band does not need to be lowered, and step S202 is executed.

[0171] Step S209: The first input / output interface outputs a low-level control signal, and the second input / output interface outputs a high-level control signal.

[0172] Specifically, when the first frequency value is greater than the second frequency value, a low frequency band is required, and the controller can input a low-level control signal to the base of the fourth transistor through the first input-output interface to control the ground terminal in the discharge circuit to be connected to the low-pass filter using the low-level control signal, and input a high-level control signal to the base of the first transistor through the second input-output interface to control the power supply in the voltage bias circuit to be disconnected from the low-pass filter using the high-level control signal, thereby realizing the discharge connection between the control circuit and the low-pass filter.

[0173] Step S210: The low-pass filter outputs a control voltage.

[0174] Specifically, the low-pass filter is discharged through the control circuit, and based on the discharge voltage obtained after the discharge, the pulse wave input by the phase-locked loop is filtered to obtain the control voltage.

[0175] Step S211: Check whether the control voltage is stable.

[0176] Specifically, when the control voltage output by the low-pass filter is stable, the low-pass filter can execute step S202 to input the control voltage into the voltage-controlled oscillator, so that the voltage-controlled oscillator outputs an operating frequency corresponding to the control voltage, until the operating frequency output by the voltage-controlled oscillator is adjusted to the target frequency, the difference between the operating frequency output by the voltage-controlled oscillator and the target frequency is close to zero, and the phase-locked loop in the RF circuit will be in a locked state.

[0177] When the control voltage output by the low-pass filter is unstable, the low-pass filter may repeatedly perform step S210 until the control voltage is stable.

[0178] To summarize, the control method of the RF circuit provided in the embodiment of the present application performs pulse control on the voltage-controlled oscillator through the phase-locked loop of the RF circuit control system, and performs bias control on the voltage-controlled oscillator through the controller of the RF circuit control system. This shortens the time for correcting the frequency of the RF circuit without increasing the extra power consumption of the RF circuit, improves the efficiency of correcting the frequency of the RF circuit, and realizes rapid locking of the phase-locked loop in the RF circuit without incurring extra power consumption overhead.

[0179] Device Embodiment

[0180] Reference Figure 2 The embodiment of the present application also provides a radio frequency circuit control system, the radio frequency circuit control system includes a radio frequency circuit and a control circuit; the radio frequency circuit includes a controller, a phase-locked loop, a low-pass filter and a voltage-controlled oscillator; the controller, the phase-locked loop, the low-pass filter and the voltage-controlled oscillator are connected in series in sequence; the voltage-controlled oscillator is also connected to the low-pass filter; the controller is also connected to the control circuit;

[0181] The phase-locked loop is used to input a pulse wave to the low-pass filter according to the target frequency of the radio frequency circuit and the operating frequency output by the voltage-controlled oscillator;

[0182] The controller is used to control the connection mode between the control circuit and the low-pass filter according to the target frequency and the operating frequency; the connection mode includes any one of voltage bias connection, discharge connection and disconnection;

[0183] The low-pass filter is used to filter the pulse wave based on the connection mode with the control circuit to obtain a control voltage, and input the control voltage to the voltage-controlled oscillator;

[0184] The voltage-controlled oscillator is used to output an operating frequency corresponding to the control voltage based on the control voltage.

[0185] Optionally, the control circuit includes a voltage bias circuit and a discharge circuit; the voltage bias circuit is used to provide a bias voltage to the low-pass filter, and the discharge circuit is used to discharge the low-pass filter;

[0186] The controller is specifically used for:

[0187] When the first frequency value of the operating frequency and the second frequency value of the target frequency are the same, controlling the discharge circuit to be disconnected from the low-pass filter, and controlling the voltage bias circuit to be disconnected from the low-pass filter;

[0188] When the first frequency value is less than the second frequency value, controlling the voltage bias circuit to be connected to the low-pass filter, and controlling the discharge circuit to be disconnected from the low-pass filter;

[0189] When the first frequency value is greater than the second frequency value, the discharge circuit is controlled to be connected to the low-pass filter, and the voltage bias circuit is controlled to be disconnected from the low-pass filter.

[0190] Optionally, the controller is further configured to:

[0191] When the radio frequency circuit is turned off, the discharge circuit is controlled to be connected to the low-pass filter, and the voltage bias circuit is controlled to be disconnected from the low-pass filter.

[0192] Optionally, the control circuit includes a voltage bias circuit and a discharge circuit;

[0193] The voltage bias circuit includes a first triode, a second triode, a third triode, a metal oxide semiconductor field effect transistor and a power supply; the base of the first triode is connected to the second input and output interface of the controller, the collector of the first triode is connected to the base of the second triode, the collector of the second triode is connected to the base of the third triode, the collector of the third triode is connected to the gate of the metal oxide semiconductor field effect transistor, the source of the metal oxide semiconductor field effect transistor is connected to the low-pass filter, and the drain of the metal oxide semiconductor field effect transistor and the emitter of the third triode are both connected to the power supply;

[0194] The discharge circuit includes a fourth transistor, a fifth transistor and a ground terminal, the base of the fourth transistor is connected to the first input-output interface of the controller, the collector of the fourth transistor is connected to the base of the fifth transistor, the collector of the fifth transistor is connected to the low-pass filter, and the emitter of the fifth transistor is connected to the ground terminal.

[0195] Optionally, when the first frequency value of the operating frequency is the same as the second frequency value of the target frequency, the controller is specifically configured to:

[0196] Inputting a high-level control signal to the base of the fourth transistor through the first input-output interface, so as to control the ground terminal in the discharge circuit to be disconnected from the low-pass filter by using the high-level control signal;

[0197] A high-level control signal is input to the base of the first transistor through the second input-output interface, so as to use the high-level control signal to control the power supply in the voltage bias circuit to be disconnected from the low-pass filter.

[0198] Optionally, when the first frequency value of the operating frequency is less than the second frequency value of the target frequency, the controller is specifically configured to:

[0199] Inputting a high-level control signal to the base of the fourth transistor through the first input-output interface, so as to control the ground terminal in the discharge circuit to be disconnected from the low-pass filter by using the high-level control signal;

[0200] A low-level control signal is input to the base of the first transistor through the second input-output interface, so as to utilize the low-level control signal to control the power supply in the voltage bias circuit to be connected to the low-pass filter.

[0201] Optionally, when the first frequency value of the operating frequency is greater than the second frequency value of the target frequency, the controller is specifically configured to:

[0202] Inputting a low-level control signal to the base of the fourth transistor through the first input-output interface, so as to control the ground terminal in the discharge circuit to be connected to the low-pass filter by using the low-level control signal;

[0203] A high-level control signal is input to the base of the first transistor through the second input-output interface, so as to use the high-level control signal to control the power supply in the voltage bias circuit to be disconnected from the low-pass filter.

[0204] Optionally, the first transistor, the second transistor, the fourth transistor and the fifth transistor are NPN transistors;

[0205] The third transistor is a PNP transistor.

[0206] Optionally, the controller is further configured to:

[0207] A frequency control signal is sent to the phase-locked loop; the frequency control signal carries the target frequency of the radio frequency circuit.

[0208] Optionally, the phase-locked loop is specifically used for:

[0209] Determining a phase difference between the operating frequency and the target frequency according to the target frequency of the radio frequency circuit and the operating frequency output by the voltage-controlled oscillator;

[0210] A pulse wave corresponding to the phase difference is generated, and the pulse wave is input to the low-pass filter.

[0211] Optionally, the low-pass filter is specifically used to:

[0212] In the case where the connection mode is a voltage bias connection, filtering the pulse wave based on the bias voltage provided by the control circuit to obtain a control voltage;

[0213] When the connection mode is a discharge connection, discharge is performed through a control circuit, and the pulse wave is filtered based on the discharge voltage obtained after the discharge to obtain a control voltage;

[0214] When the connection mode is disconnection, the pulse wave is filtered based on the current voltage to obtain a control voltage.

[0215] As for the above-mentioned device embodiment, since it is basically similar to the control method embodiment of the radio frequency circuit, the relevant parts can be referred to the partial description of the method embodiment.

[0216] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0217] An embodiment of the present application also provides a radio frequency product, which includes the radio frequency circuit control system as described above. The radio frequency circuit control system can implement the radio frequency circuit control method as described above and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0218] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0219] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A method for controlling a radio frequency circuit, characterized in that: Applied to a radio frequency circuit control system, the radio frequency circuit control system includes a radio frequency circuit and a control circuit; the radio frequency circuit includes a controller, a phase-locked loop, a low-pass filter and a voltage-controlled oscillator; the controller, the phase-locked loop, the low-pass filter and the voltage-controlled oscillator are connected in series in sequence; the voltage-controlled oscillator is also connected to the low-pass filter; the controller is also connected to the control circuit; the method includes: The phase-locked loop inputs a pulse wave to the low-pass filter according to the target frequency of the radio frequency circuit and the operating frequency output by the voltage-controlled oscillator; The controller controls the connection mode between the control circuit and the low-pass filter according to the target frequency and the operating frequency; the connection mode includes any one of voltage bias connection, discharge connection and disconnection; The low-pass filter performs filtering processing on the pulse wave based on the connection mode with the control circuit to obtain a control voltage, and inputs the control voltage into the voltage-controlled oscillator; The voltage-controlled oscillator outputs an operating frequency corresponding to the control voltage based on the control voltage.

2. The method according to claim 1, characterized in that The control circuit includes a voltage bias circuit and a discharge circuit; the voltage bias circuit is used to provide a bias voltage to the low-pass filter, and the discharge circuit is used to discharge the low-pass filter; The controller controls the connection mode between the control circuit and the low-pass filter according to the target frequency and the operating frequency, including: When the first frequency value of the operating frequency and the second frequency value of the target frequency are the same, the controller controls the discharge circuit to be disconnected from the low-pass filter, and controls the voltage bias circuit to be disconnected from the low-pass filter; When the first frequency value is less than the second frequency value, the controller controls the voltage bias circuit to be connected to the low-pass filter, and controls the discharge circuit to be disconnected from the low-pass filter; In a case where the first frequency value is greater than the second frequency value, the controller controls the discharge circuit to be connected to the low-pass filter, and controls the voltage bias circuit to be disconnected from the low-pass filter.

3. The method according to claim 2, characterized in that The method further comprises: When the radio frequency circuit is turned off, the controller controls the discharge circuit to be connected to the low-pass filter, and controls the voltage bias circuit to be disconnected from the low-pass filter.

4. The method according to claim 1, characterized in that The control circuit includes a voltage bias circuit and a discharge circuit; The voltage bias circuit includes a first triode, a second triode, a third triode, a metal oxide semiconductor field effect transistor and a power supply; the base of the first triode is connected to the second input and output interface of the controller, the collector of the first triode is connected to the base of the second triode, the collector of the second triode is connected to the base of the third triode, the collector of the third triode is connected to the gate of the metal oxide semiconductor field effect transistor, the source of the metal oxide semiconductor field effect transistor is connected to the low-pass filter, and the drain of the metal oxide semiconductor field effect transistor and the emitter of the third triode are both connected to the power supply; The discharge circuit includes a fourth transistor, a fifth transistor and a ground terminal, the base of the fourth transistor is connected to the first input-output interface of the controller, the collector of the fourth transistor is connected to the base of the fifth transistor, the collector of the fifth transistor is connected to the low-pass filter, and the emitter of the fifth transistor is connected to the ground terminal.

5. The method according to claim 4, characterized in that When the first frequency value of the operating frequency and the second frequency value of the target frequency are the same, the controller controls the connection mode between the control circuit and the low-pass filter according to the target frequency and the operating frequency, including: The controller inputs a high-level control signal to the base of the fourth transistor through the first input-output interface, so as to control the ground terminal in the discharge circuit to be disconnected from the low-pass filter by using the high-level control signal; The controller inputs a high-level control signal to the base of the first transistor through the second input-output interface, so as to use the high-level control signal to control the power supply in the voltage bias circuit to be disconnected from the low-pass filter.

6. The method according to claim 4, characterized in that In a case where the first frequency value of the operating frequency is less than the second frequency value of the target frequency, the controller controls the connection mode between the control circuit and the low-pass filter according to the target frequency and the operating frequency, including: The controller inputs a high-level control signal to the base of the fourth transistor through the first input-output interface, so as to control the ground terminal in the discharge circuit to be disconnected from the low-pass filter by using the high-level control signal; The controller inputs a low-level control signal to the base of the first transistor through the second input-output interface, so as to control the power supply in the voltage bias circuit to be connected to the low-pass filter by using the low-level control signal.

7. The method according to claim 4, characterized in that In a case where the first frequency value of the operating frequency is greater than the second frequency value of the target frequency, the controller controls the connection mode between the control circuit and the low-pass filter according to the target frequency and the operating frequency, including: The controller inputs a low-level control signal to the base of the fourth transistor through the first input-output interface, so as to control the ground terminal in the discharge circuit to be connected to the low-pass filter by using the low-level control signal; The controller inputs a high-level control signal to the base of the first transistor through the second input-output interface, so as to use the high-level control signal to control the power supply in the voltage bias circuit to be disconnected from the low-pass filter.

8. The method according to claim 4, characterized in that The first transistor, the second transistor, the fourth transistor and the fifth transistor are NPN transistors; The third transistor is a PNP transistor.

9. The method according to claim 1, characterized in that: The method further comprises: The controller sends a frequency control signal to the phase-locked loop; the frequency control signal carries the target frequency of the radio frequency circuit.

10. The method according to claim 1, characterized in that The phase-locked loop inputs a pulse wave to the low-pass filter according to the target frequency of the radio frequency circuit and the operating frequency output by the voltage-controlled oscillator, including: The phase-locked loop determines the phase difference between the operating frequency and the target frequency according to the target frequency of the radio frequency circuit and the operating frequency output by the voltage-controlled oscillator; The phase-locked loop generates a pulse wave corresponding to the phase difference and inputs the pulse wave to the low-pass filter.

11. The method according to claim 1, characterized in that: The low-pass filter performs filtering processing on the pulse wave based on the connection mode with the control circuit to obtain a control voltage, including: In the case where the connection mode is a voltage bias connection, the low-pass filter performs filtering processing on the pulse wave based on the bias voltage provided by the control circuit to obtain a control voltage; When the connection mode is a discharge connection, the low-pass filter is discharged through a control circuit, and the pulse wave is filtered based on the discharge voltage obtained after the discharge to obtain a control voltage; When the connection mode is disconnection, the low-pass filter performs filtering processing on the pulse wave based on the current voltage to obtain a control voltage.

12. A radio frequency circuit control system, characterized in that: The radio frequency circuit control system includes a radio frequency circuit and a control circuit; the radio frequency circuit includes a controller, a phase-locked loop, a low-pass filter and a voltage-controlled oscillator; the controller, the phase-locked loop, the low-pass filter and the voltage-controlled oscillator are connected in series in sequence; the voltage-controlled oscillator is also connected to the low-pass filter; the controller is also connected to the control circuit; The phase-locked loop is used to input a pulse wave to the low-pass filter according to the target frequency of the radio frequency circuit and the operating frequency output by the voltage-controlled oscillator; The controller is used to control the connection mode between the control circuit and the low-pass filter according to the target frequency and the operating frequency; the connection mode includes any one of voltage bias connection, discharge connection and disconnection; The low-pass filter is used to filter the pulse wave based on the connection mode with the control circuit to obtain a control voltage, and input the control voltage to the voltage-controlled oscillator; The voltage-controlled oscillator is used to output an operating frequency corresponding to the control voltage based on the control voltage.

13. A radio frequency product, characterized in that: The radio frequency product includes the radio frequency circuit control system as described in claim 12.

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