Control circuit for solving switching frequency spectrum stray problem in radio frequency module and radio frequency module

Abstract

The invention relates to the technical field of radio frequency, and particularly discloses a control circuit for solving the problem of frequency spectrum stray of a switch in a radio frequency module and the radio frequency module, and a core module of the control circuit is composed of an oscillation circuit and a multi-stage negative voltage generation circuit. According to the multi-stage negative voltage generation circuit adopting a multi-stage charge pump structure, the oscillation circuit provides a clock signal, and the multi-stage negative voltage generation circuit provides a negative voltage signal for the radio frequency switch. The multi-stage charge pump structure can solve the problem of frequency spectrum stray caused by overlarge voltage swing of a single-stage charge pump when the power supply voltage is too high, and the problem that the radio frequency performance cannot be met due to too low negative voltage generated by the single-stage charge pump structure when the power supply voltage is too low. Therefore, a lower power supply voltage can be adopted, a pure frequency spectrum can be generated, and the radio frequency switch performance is good.

Description

Technical Field

[0001] The present application relates to the field of radio frequency technology, and in particular to a control circuit and a radio frequency module for solving the problem of switching spectrum spurious in a radio frequency module. Background Art

[0002] Spurious signals refer to energy components that appear in the signal spectrum and are concentrated on frequencies other than the desired signal. The intensity of various interfering signals in the RF band is usually greater than that of the desired signal. Therefore, the RF switch noise must be very low, that is, the RF switch needs to have a fairly high spectrum purity within the working frequency band to ensure that the useful signal obtained has a high signal-to-noise ratio, thereby ensuring the quality of communication.

[0003] In order to obtain high spectrum purity for the RF switch, it is necessary to reduce the ripple effect of the control voltage on the RF switch end as much as possible. At the same time, in order to take into account other performance of the RF switch, a negative voltage control circuit is usually used. The negative voltage control circuit often brings some spectrum spurious. This is because when the negative voltage control circuit is powered by an internal or external power supply, the negative voltage generated depends on the size of the power supply provided by the previous stage. Often, if the power supply voltage is too high, spectrum spurious problems will occur, and if the power supply voltage is too low, the negative voltage will be too high to meet the RF performance.

[0004] Solving the problem that the negative pressure control circuit of the radio frequency switch cannot take into account both spectrum purity and radio frequency performance is a technical problem that needs to be solved by those skilled in the art. Summary of the invention

[0005] The purpose of this application is to provide a control circuit and a radio frequency module for solving the problem of switch spectrum spuriousness in a radio frequency module, and to solve the problem that the negative voltage control circuit of the radio frequency switch cannot take into account both spectrum purity and radio frequency performance.

[0006] In order to solve the above technical problems, the present application provides a control circuit for solving the switching spectrum spurious problem in a radio frequency module, comprising: an oscillation circuit and a multi-stage negative voltage generating circuit;

[0007] Wherein, the multi-stage negative voltage generating circuit has a multi-stage charge pump structure;

[0008] The output end of the oscillation circuit is connected to the clock signal input end of the multi-stage negative voltage generating circuit, and the output end of the multi-stage negative voltage generating circuit is connected to the negative voltage bias input end of the radio frequency switch.

[0009] Optionally, the multi-stage negative voltage generating circuit is specifically a two-stage negative voltage generating circuit with a two-stage charge pump structure.

[0010] Optionally, a first-stage negative voltage generating circuit in the multi-stage negative voltage generating circuit includes a first PMOS transistor, a first NMOS transistor, a second PMOS transistor, a second NMOS transistor, a first capacitor, and a second capacitor;

[0011] The first end of the first capacitor and the first end of the second capacitor are connected to the output end of the oscillation circuit, the second end of the first capacitor, the drain of the first PMOS tube, the drain of the first NMOS tube, the gate of the second PMOS tube, and the gate of the second NMOS tube are connected, the second end of the second capacitor, the drain of the second PMOS tube, the drain of the second NMOS tube, the gate of the first PMOS tube, and the gate of the first NMOS tube are connected, the source of the first PMOS tube and the source of the second NMOS tube are connected as a first wiring terminal, and the source of the first NMOS tube and the source of the second PMOS tube are connected as a second wiring terminal;

[0012] The first terminal of the negative voltage generating circuit at the input end of the multi-stage negative voltage generating circuit is grounded, the second terminal of the negative voltage generating circuit at the output end of the multi-stage negative voltage generating circuit is connected to the first terminal of the second-stage negative voltage circuit, and the second terminal of the second-stage negative voltage circuit is connected to the negative voltage bias input end of the radio frequency switch.

[0013] Optionally, the negative pressure generating circuit further includes a stackable decoupling capacitor circuit;

[0014] The stackable decoupling capacitor circuit includes a plurality of third capacitors of different types;

[0015] A first end of the third capacitor is connected to the second terminal, and a second end of the third capacitor is grounded.

[0016] Optionally, the third capacitor specifically includes a metal-insulator-metal capacitor and a metal-oxide-semiconductor capacitor.

[0017] Optionally, both the first capacitor and the second capacitor are adjustable capacitors.

[0018] Optionally, the oscillation circuit specifically includes an oscillation regulation circuit and a ring oscillation circuit;

[0019] The output end of the oscillation regulating circuit is connected to the input end of the ring oscillation circuit, and the output end of the ring oscillation circuit is connected to the clock signal input end of the multi-stage negative voltage generating circuit;

[0020] The oscillation regulating circuit is used to provide a plurality of oscillation frequencies for the ring oscillation circuit, so that the ring oscillation circuit outputs a plurality of clock signals accordingly.

[0021] Optionally, the oscillation regulation circuit specifically includes a programmable circuit and an oscillation signal output circuit;

[0022] The output end of the programmable circuit is connected to the control end of the oscillation signal output circuit, and the output end of the oscillation signal output circuit is connected to the clock signal input end of the multi-stage negative voltage generating circuit;

[0023] The programmable circuit is used to adjust the on-off of the switch in the oscillation signal output circuit so that the oscillation signal output circuit generates a variety of oscillation frequencies.

[0024] Optionally, the programmable circuit specifically includes a plurality of inverter circuits, each of which is composed of two first inverters and a second inverter connected in sequence;

[0025] The oscillation signal output circuit includes oscillation signal output branches corresponding to the inverter circuits one by one, and each of the oscillation signal output branches includes a third PMOS tube, a fourth PMOS tube, a fifth PMOS tube, and a sixth PMOS tube;

[0026] In each of the oscillation signal output branches, the drain of the third PMOS tube, the source of the fourth PMOS tube, and the gate of the fifth PMOS tube are connected, the source of the third PMOS tube and the source of the fifth PMOS tube are connected to a DC power supply, the drain of the fifth PMOS tube and the source of the sixth PMOS tube are connected, the drain of the sixth PMOS tube is the output end of the oscillation signal output circuit, the gate of the third PMOS tube is connected to the output end of the first inverter, and the gate of the fourth PMOS tube is connected to the output end of the second inverter.

[0027] In order to solve the above technical problems, the present application also provides a radio frequency module, including a control circuit as described in any of the above items for solving the switching spectrum spurious problem in the radio frequency module.

[0028] The control circuit provided by the present application solves the problem of switching spectrum spuriousness in the RF module, wherein the core module of the control circuit is composed of an oscillating circuit and a multi-stage negative voltage generating circuit. Compared with the negative voltage control circuit of the RF switch in the related art, a multi-stage negative voltage generating circuit with a multi-stage charge pump structure is adopted, in which the oscillating circuit provides a clock signal, and the multi-stage negative voltage generating circuit provides a negative voltage signal for the RF switch. The multi-stage charge pump structure can solve the problem of spectrum spuriousness caused by excessive voltage swing of a single-stage charge pump when the power supply voltage is too high, and the problem that the negative voltage generated by the single-stage charge pump structure is too low to meet the RF performance when the power supply voltage is too low. Therefore, a lower power supply voltage can be used, which can produce a pure spectrum and have good RF switch performance.

[0029] The present application also provides a radio frequency module having the above-mentioned beneficial effects, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions of the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 A schematic diagram of the structure of a control circuit for solving the problem of switching spectrum spurious in a radio frequency module provided in an embodiment of the present application;

[0032] Figure 2 A circuit diagram of a multi-stage negative pressure generating circuit provided in the present application;

[0033] Figure 3 A circuit diagram of a programmable circuit provided in an embodiment of the present application;

[0034] Figure 4 A circuit diagram of an oscillation signal output circuit provided in an embodiment of the present application;

[0035] 101 is an oscillating circuit, and 102 is a multi-stage negative pressure generating circuit. DETAILED DESCRIPTION

[0036] The core of this application is to provide a control circuit and a radio frequency module for solving the problem of switch spectrum spuriousness in the radio frequency module, which is used to solve the problem that the negative pressure control circuit of the radio frequency switch cannot take into account both spectrum purity and radio frequency performance.

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] Embodiment 1

[0039] Figure 1 A schematic diagram of the structure of a control circuit for solving the problem of switching spectrum spurious in a radio frequency module provided in an embodiment of the present application; Figure 2 A circuit diagram of a multi-stage negative pressure generating circuit provided in this application.

[0040] like Figure 1As shown, the control circuit for solving the switching spectrum spurious problem in the radio frequency module provided in the embodiment of the present application includes: an oscillation circuit 101 and a multi-stage negative voltage generating circuit 102;

[0041] Wherein, the multi-stage negative voltage generating circuit 102 has a multi-stage charge pump structure;

[0042] The output end of the oscillation circuit 101 is connected to the clock signal input end of the multi-stage negative voltage generating circuit 102 , and the output end of the multi-stage negative voltage generating circuit 102 is connected to the negative voltage bias input end of the radio frequency switch.

[0043] In the related technologies of RF modules, negative voltage control circuits all use a first-level negative voltage generation circuit to provide negative voltage for RF switches. If the power supply voltage is too high, spectrum spurious problems will occur. If the power supply voltage is too low, the negative voltage generated will be too high and cannot meet the RF performance. In the control circuit for solving the switch spectrum spurious problem in the RF module provided in the embodiment of the present application, the negative voltage generation circuit adopts a multi-stage charge pump structure, which can solve the problem that the negative voltage generated when the power supply voltage is low is too high and cannot meet the RF performance, so that a lower power supply voltage can be used, which can produce a pure spectrum and have good RF switch performance.

[0044] It should be noted that the control circuit provided in the present application for solving the switching spectrum spurious problem in the RF module is composed of an oscillation circuit 101 and a multi-stage negative voltage generating circuit 102, but is not limited to including only these two circuit parts.

[0045] The multi-stage negative voltage generating circuit 102 is powered by an internal power supply and / or an external power supply, and outputs a negative voltage to a negative voltage bias input terminal of the radio frequency switch. The clock signal of the multi-stage negative voltage generating circuit 102 is provided by the oscillation circuit 101.

[0046] In practical applications, the multi-stage negative voltage generating circuit 102 may specifically be a two-stage negative voltage generating circuit having a two-stage charge pump structure.

[0047] like Figure 1 As shown, in the control circuit for solving the switching spectrum spurious problem in the radio frequency module provided in the embodiment of the present application, the multi-stage negative voltage generating circuit 102 specifically includes a first-stage negative voltage circuit and a second-stage negative voltage circuit.

[0048] In the embodiment of the present application, the first-stage negative voltage circuit and the second-stage negative voltage circuit may adopt the same structure.

[0049] like Figure 2 As shown, a first-stage negative voltage generating circuit in the multi-stage negative voltage generating circuit 102 includes a first PMOS transistor, a first NMOS transistor, a second PMOS transistor, a second NMOS transistor, a first capacitor, and a second capacitor;

[0050] The first end of the first capacitor and the first end of the second capacitor are connected to the output end of the oscillation circuit 101, the second end of the first capacitor, the drain of the first PMOS tube, the drain of the first NMOS tube, the gate of the second PMOS tube, and the gate of the second NMOS tube are connected, the second end of the second capacitor, the drain of the second PMOS tube, the drain of the second NMOS tube, the gate of the first PMOS tube, and the gate of the first NMOS tube are connected, the source of the first PMOS tube and the source of the second NMOS tube are connected as a first terminal, and the source of the first NMOS tube and the source of the second PMOS tube are connected as a second terminal;

[0051] The first terminal of the negative voltage generating circuit at the input end of the multi-stage negative voltage generating circuit 102 is grounded, the second terminal of the negative voltage generating circuit at the output end of the multi-stage negative voltage generating circuit 102 is connected to the first terminal of the second-stage negative voltage circuit, and the second terminal of the second-stage negative voltage circuit is connected to the negative voltage bias input end of the radio frequency switch.

[0052] Taking the multi-stage negative voltage generating circuit 102 as a two-stage negative voltage generating circuit having a two-stage charge pump structure as an example, Figure 2As shown, it can be recorded that in the first stage negative voltage generating circuit, the first PMOS tube is Q1, the first NMOS tube is Q2, the second PMOS tube is Q3, the second NMOS tube is Q4, the first capacitor is C1, the second capacitor is C2, the first terminal is A1, and the second terminal is B1. In the second stage negative voltage generating circuit, the first PMOS tube is Q5, the first NMOS tube is Q6, the second PMOS tube is Q7, the second NMOS tube is Q8, the first capacitor is C3, the second capacitor is C4, the first terminal is A2, and the second terminal is B2. Then the first end of the first capacitor C1, the first end of the second capacitor C2, the first end of the first capacitor C3, and the first end of the second capacitor C4 are respectively connected to the output end of the oscillation circuit 101, and are controlled by the clock signal CLK. The second end of the first capacitor C1, the drain of the first PMOS tube Q1, the drain of the first NMOS tube Q2, the gate of the second PMOS tube Q3, and the gate of the second NMOS tube Q4 are connected; the second end of the second capacitor C2, the drain of the second PMOS tube Q3, the drain of the second NMOS tube Q4, the gate of the first PMOS tube Q1, and the gate of the first NMOS tube Q2 are connected; the source of the first PMOS tube Q1 and the source of the second NMOS tube Q4 are grounded; the source of the first NMOS tube Q2, the source of the second PMOS tube Q3, and the source of the first PMOS tube Q2 are grounded. The source of Q5 and the source of the second NMOS tube Q8 are connected, the second end of the first capacitor C3, the drain of the first PMOS tube Q5, the drain of the first NMOS tube Q6, the gate of the second PMOS tube Q7, and the gate of the second NMOS tube Q8 are connected, the second end of the second capacitor C4, the drain of the second PMOS tube Q7, the drain of the second NMOS tube Q8, the gate of the first PMOS tube Q5, and the gate of the first NMOS tube Q6 are connected, and the source of the first NMOS tube Q6 and the source of the second PMOS tube Q7 are connected to the negative voltage bias input terminal of the RF switch. When the multi-stage negative voltage generating circuit 102 includes more than two stages of negative voltage generating circuits, the same applies.

[0053] Furthermore, in the control circuit for solving the switching spectrum spurious problem in the radio frequency module provided in the embodiment of the present application, both the first-stage negative voltage circuit and the second-stage negative voltage circuit may further include a stackable decoupling capacitor circuit;

[0054] The stackable decoupling capacitor circuit includes a plurality of third capacitors of different types;

[0055] A first end of the third capacitor is connected to the second terminal, and a second end of the third capacitor is grounded.

[0056] like Figure 2As shown, a decoupling capacitor circuit is added after each level of negative voltage circuit. In order to increase the capacitor area, the decoupling capacitor circuit is composed of two different types of capacitors, that is, a superimposable decoupling capacitor circuit is added after each level of negative voltage circuit. Each capacitor in the superimposable decoupling capacitor circuit can be recorded as a third capacitor. According to the chip production process, different types of capacitors are often deployed at different levels of the chip. Different types of third capacitors can be used to form a superimposable decoupling capacitor circuit. The superimposed structure can effectively increase the capacitance size within the unchanged chip area area to obtain a smaller bias ripple at the RF switch end, and can also effectively reduce the problem of increased chip area caused by the two-stage structure. Specifically, different types of third capacitors can be selected from metal-insulator-metal (Metal-Insulator-Metal, MIM) capacitors and metal-oxide-semiconductor (Metal-Oxide-Semiconductor, MOS) capacitors.

[0057] Taking the multi-stage negative voltage generating circuit 102 as a two-stage negative voltage generating circuit having a two-stage charge pump structure as an example, Figure 2 As shown, it can be recorded that in the first stage negative voltage generating circuit, the superimposable decoupling capacitor circuit is composed of capacitor C5 and capacitor C6. In the second stage negative voltage generating circuit, the superimposable decoupling capacitor circuit is composed of capacitor C7 and capacitor C8. Then capacitor C5 and capacitor C6 are respectively connected between the second terminal B1 of the first stage negative voltage generating circuit and the ground, and capacitor C7 and capacitor C8 are respectively connected between the second terminal B2 of the second stage negative voltage generating circuit and the ground.

[0058] Embodiment 2

[0059] Depending on the chip and the application scenario, the negative voltage control circuit with fixed parameter components in the related art may not be able to achieve the best performance of the RF switch. Therefore, in the control circuit for solving the switching spectrum spurious problem in the RF module provided in the embodiment of the present application, in each level of the negative voltage generating circuit, at least one of the first capacitor and the second capacitor can use an adjustable capacitor. Furthermore, both the first capacitor and the second capacitor can use adjustable capacitors.

[0060] The adjustable capacitor is a capacitor with adjustable capacitance, which can be specifically composed of a capacitor switching circuit and a plurality of capacitors with different capacitances. In practical applications, the best RF performance and the smallest RF switching frequency deviation can usually be obtained by controlling the first capacitor and the second capacitor to have the same capacitance. It is understandable that in some applications, it is not excluded that the best RF performance and the smallest RF switching frequency deviation can be obtained when the first capacitor and the second capacitor have different capacitances.

[0061] In the multi-stage negative voltage generating circuit 102, the first capacitor and the second capacitor in each stage of the negative voltage generating circuit can also be controlled to have the same or different capacitances to form a variety of combination schemes to obtain the best RF performance and the minimum RF switching frequency deviation.

[0062] Embodiment 3

[0063] Figure 3 A circuit diagram of a programmable circuit provided in an embodiment of the present application; Figure 4 A circuit diagram of an oscillation signal output circuit provided in an embodiment of the present application.

[0064] On the basis of the above embodiments, the embodiment of the present application further introduces the oscillation circuit 101. Depending on the different chips and application scenarios, if the negative voltage control circuit with fixed parameter components in the related technology is used, it may not be possible to achieve the best performance of the RF switch. Therefore, in the control circuit for solving the switching spectrum spurious problem in the RF module provided in the embodiment of the present application, the oscillation circuit 101 may specifically include an oscillation adjustment circuit and a ring oscillation circuit;

[0065] The output end of the oscillation regulating circuit is connected to the input end of the ring oscillation circuit, and the output end of the ring oscillation circuit is connected to the clock signal input end of the multi-stage negative voltage generating circuit 102;

[0066] The oscillation regulating circuit is used to provide a variety of oscillation frequencies for the ring oscillation circuit, so that the ring oscillation circuit can output a variety of clock signals accordingly.

[0067] In a specific implementation, the composition of the ring oscillator circuit can specifically refer to the composition of the ring oscillator circuit in the RF module in the related art, and will not be repeated here. Unlike the oscillator circuit 101 with a fixed oscillation frequency in the RF module recorded in the related art, the embodiment of the present application adopts an adjustable oscillator circuit 101, that is, different types of oscillation signals are generated by the oscillation adjustment circuit to control the ring oscillator circuit, so as to output a variety of different clock signals to the multi-stage negative voltage generating circuit 102. The clock signal provided to the multi-stage negative voltage circuit can be adjusted by debugging the oscillation adjustment circuit, so as to maximize the switching efficiency of the RF switch while meeting the spectrum purity, thereby providing guarantee for the communication quality.

[0068] The adjustable oscillation circuit provided in the embodiment of the present application can be used in conjunction with the adjustable first capacitor and the adjustable second capacitor in the multi-stage negative voltage generating circuit 102 provided in the second embodiment of the present application. In practical applications, different clock signals are generated by adjusting the oscillation frequency of the oscillation circuit 101 and the capacitance of the first capacitor and the capacitance of the second capacitor in the multi-stage negative voltage generating circuit 102, so that different combination schemes can be obtained, thereby further obtaining a radio frequency switch control scheme with the highest switching efficiency on the basis of the multi-stage negative voltage generating circuit 102.

[0069] like Figure 3 and Figure 4 As shown, in the control circuit for solving the switching spectrum spurious problem in the radio frequency module provided in the embodiment of the present application, the oscillation regulation circuit may specifically include a programmable circuit and an oscillation signal output circuit;

[0070] The output end of the programmable circuit is connected to the control end of the oscillation signal output circuit, and the output end of the oscillation signal output circuit is connected to the clock signal input end of the multi-stage negative voltage generating circuit 102;

[0071] The programmable circuit is used to adjust the on-off of the switch in the oscillation signal output circuit so that the oscillation signal output circuit generates a variety of oscillation frequencies.

[0072] In a specific implementation, the input end of the programmable circuit can be connected to the control pin of the front-stage controller, and can also be connected to the control switch to receive an external control signal to adjust the control signal output by the programmable circuit.

[0073] Furthermore, the programmable circuit specifically includes a plurality of inverter circuits, each of which is composed of two first inverters and a second inverter connected in sequence;

[0074] The oscillation signal output circuit includes oscillation signal output branches corresponding to the inverter circuits one by one, and each oscillation signal output branch includes a third PMOS tube, a fourth PMOS tube, a fifth PMOS tube, and a sixth PMOS tube;

[0075] In each oscillation signal output branch, the drain of the third PMOS tube, the source of the fourth PMOS tube, and the gate of the fifth PMOS tube are connected, the source of the third PMOS tube and the source of the fifth PMOS tube are connected to a DC power supply, the drain of the fifth PMOS tube and the source of the sixth PMOS tube are connected, the drain of the sixth PMOS tube is the output end of the oscillation signal output circuit, the gate of the third PMOS tube is connected to the output end of the first inverter, and the gate of the fourth PMOS tube is connected to the output end of the second inverter.

[0076] In a specific implementation, taking a four-bit programmable circuit as an example, Figure 3 and Figure 4As shown, the programmable circuit specifically includes four inverter circuits. Among them, the first inverter circuit is composed of an inverter U11 and an inverter U12. The input end of the inverter U11 receives the control signal LOGIC <0> The output of the inverter U11 outputs selF_B <0> The signal is sent to the gate of the third PMOS tube Q11, and the output end of the inverter U12 outputs selF <0> The signal is sent to the gate of Q12 of the fourth PMOS tube; the second inverter circuit is composed of an inverter U21 and an inverter U22, and the input end of the inverter U21 receives the control signal LOGIC <1> The output terminal of the inverter U21 outputs selF_B <1> The signal is sent to the gate of the third PMOS tube Q21, and the output end of the inverter U22 outputs selF <1> The third inverter circuit is composed of an inverter U31 and an inverter U32, and the input end of the inverter U31 receives the control signal LOGIC <2> The output terminal of the inverter U31 outputs selF_B <2> The signal is sent to the gate of the third PMOS tube Q31, and the output end of the inverter U32 outputs selF <2> The fourth inverter circuit is composed of an inverter U41 and an inverter U42, and the input end of the inverter U41 receives the control signal LOGIC <3> The output terminal of the inverter U41 outputs selF_B <3> The signal is sent to the gate of the third PMOS tube Q41, and the output end of the inverter U42 outputs selF <3> The signal is given to the gate of Q42 of the fourth PMOS tube.

[0077] Based on Figure 3 The programmable circuit shown and Figure 4 The oscillation signal output circuit shown outputs a current I_osc to the ring oscillation circuit to adjust the clock signal output by the ring oscillation circuit.

[0078] Embodiment 4

[0079] The above describes in detail various embodiments corresponding to the control circuit for solving the problem of switching spectrum spurious in the RF module. On this basis, the present application also discloses a RF module corresponding to the control circuit for solving the problem of switching spectrum spurious in the RF module. The RF module may include the control circuit for solving the problem of switching spectrum spurious in the RF module provided by any one of the above embodiments.

[0080] In practical applications, the radio frequency module provided in the embodiment of the present application can be applied to communication equipment, smart terminals and other equipment. A control signal can be input into the device where the radio frequency module is located to control the clock signal output by the adjustable oscillation circuit and the capacitance of the first capacitor and the capacitance of the second capacitor in the multi-stage negative voltage generating circuit through a controller or a switching switch, so as to maximize the switching efficiency of the radio frequency switch while meeting the spectrum purity, thereby providing guarantee for communication quality.

[0081] Since the embodiments of the RF module part correspond to the embodiments of the control circuit part for solving the switching spectrum spurious problem in the RF module, please refer to the description of the embodiments of the control circuit part for solving the switching spectrum spurious problem in the RF module for the embodiments of the RF module part, which will not be repeated here.

[0082] The above is a detailed introduction to a control circuit and a radio frequency module provided by the present application for solving the problem of switch spectrum spuriousness in a radio frequency module. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments can refer to each other. For the radio frequency module disclosed in the embodiment, since it corresponds to the control circuit for solving the problem of switch spectrum spuriousness in the radio frequency module disclosed in the embodiment, the description is relatively simple. For the relevant parts, refer to the description of the control circuit for solving the problem of switch spectrum spuriousness in the radio frequency module. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

[0083] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

Claims

1. A control circuit for solving the problem of switching spectrum spurious in a radio frequency module, characterized in that: include: Oscillation circuit and multi-stage negative voltage generating circuit; Wherein, the multi-stage negative voltage generating circuit has a multi-stage charge pump structure; The output end of the oscillation circuit is connected to the clock signal input end of the multi-stage negative voltage generating circuit, and the output end of the multi-stage negative voltage generating circuit is connected to the negative voltage bias input end of the radio frequency switch.

2. The control circuit for solving the switching spectrum spurious problem in the radio frequency module according to claim 1, characterized in that: The multi-stage negative voltage generating circuit is specifically a two-stage negative voltage generating circuit with a two-stage charge pump structure.

3. The control circuit for solving the switching spectrum spurious problem in the radio frequency module according to claim 1, characterized in that: The first-stage negative voltage generating circuit in the multi-stage negative voltage generating circuit comprises a first PMOS transistor, a first NMOS transistor, a second PMOS transistor, a second NMOS transistor, a first capacitor and a second capacitor; The first end of the first capacitor and the first end of the second capacitor are connected to the output end of the oscillation circuit, the second end of the first capacitor, the drain of the first PMOS tube, the drain of the first NMOS tube, the gate of the second PMOS tube, and the gate of the second NMOS tube are connected, the second end of the second capacitor, the drain of the second PMOS tube, the drain of the second NMOS tube, the gate of the first PMOS tube, and the gate of the first NMOS tube are connected, the source of the first PMOS tube and the source of the second NMOS tube are connected as a first wiring terminal, and the source of the first NMOS tube and the source of the second PMOS tube are connected as a second wiring terminal; The first terminal of the negative voltage generating circuit at the input end of the multi-stage negative voltage generating circuit is grounded, the second terminal of the negative voltage generating circuit at the output end of the multi-stage negative voltage generating circuit is connected to the first terminal of the second-stage negative voltage circuit, and the second terminal of the second-stage negative voltage circuit is connected to the negative voltage bias input end of the radio frequency switch.

4. The control circuit for solving the switching spectrum spurious problem in the radio frequency module according to claim 3, characterized in that: The negative pressure generating circuit also includes a stackable decoupling capacitor circuit; The stackable decoupling capacitor circuit includes a plurality of third capacitors of different types; A first end of the third capacitor is connected to the second terminal, and a second end of the third capacitor is grounded.

5. The control circuit for solving the switching spectrum spurious problem in the radio frequency module according to claim 4, characterized in that: The third capacitor specifically includes a metal-insulator-metal capacitor and a metal-oxide-semiconductor capacitor.

6. The control circuit for solving the switching spectrum spurious problem in the radio frequency module according to claim 3, characterized in that: The first capacitor and the second capacitor are both adjustable capacitors.

7. The control circuit for solving the switching spectrum spurious problem in the radio frequency module according to claim 1, characterized in that: The oscillation circuit specifically includes an oscillation adjustment circuit and a ring oscillation circuit; The output end of the oscillation regulating circuit is connected to the input end of the ring oscillation circuit, and the output end of the ring oscillation circuit is connected to the clock signal input end of the multi-stage negative voltage generating circuit; The oscillation regulating circuit is used to provide a plurality of oscillation frequencies for the ring oscillation circuit, so that the ring oscillation circuit outputs a plurality of clock signals accordingly.

8. The control circuit for solving the switching spectrum spurious problem in the radio frequency module according to claim 7, characterized in that: The oscillation regulation circuit specifically includes a programmable circuit and an oscillation signal output circuit; The output end of the programmable circuit is connected to the control end of the oscillation signal output circuit, and the output end of the oscillation signal output circuit is connected to the clock signal input end of the multi-stage negative voltage generating circuit; The programmable circuit is used to adjust the on-off of the switch in the oscillation signal output circuit so that the oscillation signal output circuit generates a variety of oscillation frequencies.

9. The control circuit for solving the switching spectrum spurious problem in the radio frequency module according to claim 8, characterized in that: The programmable circuit specifically includes a plurality of inverter circuits, each of which is composed of two first inverters and a second inverter connected in sequence; The oscillation signal output circuit includes oscillation signal output branches corresponding to the inverter circuits one by one, and each of the oscillation signal output branches includes a third PMOS tube, a fourth PMOS tube, a fifth PMOS tube, and a sixth PMOS tube; In each of the oscillation signal output branches, the drain of the third PMOS tube, the source of the fourth PMOS tube, and the gate of the fifth PMOS tube are connected, the source of the third PMOS tube and the source of the fifth PMOS tube are connected to a DC power supply, the drain of the fifth PMOS tube and the source of the sixth PMOS tube are connected, the drain of the sixth PMOS tube is the output end of the oscillation signal output circuit, the gate of the third PMOS tube is connected to the output end of the first inverter, and the gate of the fourth PMOS tube is connected to the output end of the second inverter.

10. A radio frequency module, characterized in that: It comprises a control circuit for solving the switching spectrum spurious problem in a radio frequency module as described in any one of claims 1 to 9.

Images