Signal generation apparatus, method, and power amplification system

Abstract

A signal generation, apparatus, a method, and a power amplification system. The signal generation apparatus comprises a compensation module and a signal amplification module, the compensation module being used for providing at least one compensation signal, and the signal amplification module being used for amplifying the compensation signal, so that the amplified compensation signal matches a power amplifier. The compensation signal generated by the compensation module can compensate for an amount of change in a related signal in the power amplifier over time and / or environmental factors, so that an output signal of the power amplifier is prevented from being affected by time and / or environmental factors such as temperature, and is more stable. The compensation signal provided by the compensation module can be determined according to a change situation that may occur in a corresponding application scenario of the power amplifier. In addition, the compensation module is independent of components such as a main bias circuit in the power amplifier, does not need to change an internal structure and / or parameter of the power amplifier, is applicable to multiple types of power amplifier, is also applicable to multiple types of application scenarios, having greater flexibility.

Description

Signal generating apparatus, method and power amplification system Technical Field

[0001] This application relates to the field of circuit technology, specifically to a signal generating device, method, and power amplification system. Background Technology

[0002] Power amplifiers (PAs) are crucial components of radio frequency (RF) equipment, and the stability of their output signals significantly impacts the performance of the RF devices. However, in actual operation, the output signal of a power amplifier is easily affected by environmental factors such as time and / or temperature. For example, the amplitude of the output signal of some power amplifiers may increase with rising ambient temperature. Traditional solutions often adjust the output signal of the power amplifier by reconfiguring the structure and / or parameters of the main bias circuit in the power amplifier to stabilize it. This adjustment method requires changes to the internal structure and / or parameters of the power amplifier (such as the main bias circuit), which has limitations.

[0003] Summary of the Invention

[0004] In view of this, this application provides a signal generating device, method and power amplification system to solve the problem of limitations in traditional schemes for stabilizing the output signal of power amplifiers.

[0005] This application provides a signal generating device, including a compensation module and a signal amplification module;

[0006] The compensation module is used to provide at least one compensation signal;

[0007] The signal amplification module is used to amplify the compensation signal so that the amplified compensation signal matches the power amplifier.

[0008] Optionally, the compensation module includes a reference current source, a first resistor, and at least one current providing unit; the input terminal of the reference current source is used to connect to a first voltage, and the output terminal is connected to the input terminal of the signal amplification module to generate a reference current; the current providing unit is used to output a time-varying current in at least one direction to the output terminal of the reference current, and the time-varying current is superimposed on the reference current to form the compensation current; the first resistor is connected between the output terminal of the reference current source and the ground terminal to convert the compensation current into a compensation voltage.

[0009] Optionally, the at least one current providing unit includes a first current providing unit and / or a second current providing unit; the first current providing unit is used to provide a first superimposed current so that the corresponding compensation current has a downward compensation capability; the second current providing unit is used to provide a second superimposed current so that the corresponding compensation current has an upward compensation capability.

[0010] Optionally, the first current providing unit includes at least one pull-up current generating branch; the pull-up current generating branch includes a first current source, a first variable capacitor, a first variable resistor, and a first MOSFET; the input terminal of the first current source is used to connect to the second voltage and is connected to the first terminal of the first variable resistor, and the output terminal is connected to the first terminal of the first variable capacitor and the gate of the first MOSFET respectively; the second terminal of the first variable capacitor is grounded; the source of the first MOSFET is connected to the second terminal of the first variable resistor, and the drain is connected to the output terminal of the reference current source.

[0011] Optionally, the first current providing unit further includes a first switch corresponding to each of the pull-up current generating branches; the first switch is disposed between the drain of the first MOS transistor and the output terminal of the reference current source, and is used to control the on / off state of the corresponding pull-up current generating branch.

[0012] Optionally, the second current providing unit includes at least one pull-down current generating branch; the pull-down current generating branch includes a second current source, a second variable capacitor, a second variable resistor, a second MOSFET, a third MOSFET, and a fourth MOSFET; the input terminal of the second current source is used to connect to the third voltage and is connected to the first terminal of the second variable resistor, and the output terminal is connected to the first terminal of the second variable capacitor and the gate of the second MOSFET respectively; the second terminal of the second variable capacitor is grounded; the drain of the second MOSFET is connected to the drain of the third MOSFET, the gate of the third MOSFET, and the gate of the fourth MOSFET respectively; the source of the third MOSFET is grounded; the drain of the fourth MOSFET is connected to the output terminal of the reference current source, and the source is grounded.

[0013] Optionally, the second current providing unit further includes a second switch corresponding to each of the pull-down current generating branches; the second switch is disposed between the drain of the fourth MOS transistor and the output terminal of the reference current source, and is used to control the on / off state of the corresponding pull-down current generating branch.

[0014] Optionally, the compensation module includes a downward compensation branch and / or an upward compensation branch; the downward compensation branch is used to provide a first time-varying voltage that decreases over time; and the upward compensation branch is used to provide a second time-varying voltage that increases over time.

[0015] Optionally, the signal generating device further includes a third switch corresponding to the downward compensation branch and a fourth switch corresponding to the upward compensation branch; the third switch is disposed between the output terminal of the downward compensation branch and the input terminal of the signal amplification module, and is used to control the on / off state of the downward compensation branch; the fourth switch is disposed between the output terminal of the upward compensation branch and the input terminal of the signal amplification module, and is used to control the on / off state of the upward compensation branch.

[0016] Optionally, the downward compensation branch includes a first voltage source, a second resistor, a third resistor, and a first capacitor; the first terminal of the first voltage source is grounded, and the second terminal is connected to the first terminal of the second resistor and the first terminal of the first capacitor; the second terminal of the second resistor is connected to the second terminal of the first capacitor, the first terminal of the third resistor, and the input terminal of the signal amplification module; the second terminal of the third resistor is grounded.

[0017] Optionally, the upward compensation branch includes a second voltage source, a fourth resistor, a fifth resistor, a sixth resistor, and a second capacitor; the first terminal of the second voltage source is grounded, and the second terminal is connected to the first terminal of the fourth resistor; the second terminal of the fourth resistor is connected to the first terminal of the fifth resistor, the first terminal of the second capacitor, and the input terminal of the signal amplification module; the second terminal of the fifth resistor is connected to the second terminal of the second capacitor and the first terminal of the sixth resistor; the second terminal of the sixth resistor is grounded.

[0018] This application also provides a signal generation method, which is applied to any of the above-mentioned signal generation devices, comprising:

[0019] Obtain the compensation requirements of the power amplifier;

[0020] Provide at least one compensation signal according to the compensation requirements;

[0021] The compensation signal is amplified so that the amplified compensation signal matches the power amplifier.

[0022] This application also provides a power amplification system, which includes a power amplifier and any of the above-described signal generating devices.

[0023] In the signal generating apparatus, method, and power amplification system described in this application, the compensation module can provide at least one compensation signal based on the possible changes in the output signal of the power amplifier in the corresponding application scenario. This compensation signal is then amplified by the signal amplification module and applied to the power amplifier. In this way, the compensation signal can compensate for the changes in the relevant signals in the power amplifier caused by time and / or environmental factors, making the output signal of the power amplifier more stable and less affected by environmental factors such as time and / or temperature. Furthermore, the compensation signal provided by the compensation module can be determined based on the possible changes in the power amplifier in the corresponding application scenario and is independent of components such as the main bias circuit in the power amplifier. It does not require changes to the internal structure and / or parameters of the power amplifier, making it applicable to multiple types of power amplifiers and multiple application scenarios, thus providing greater flexibility. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 is a schematic diagram of a power amplifier system according to an embodiment of this application;

[0026] Figure 2 is a schematic diagram of the power amplifier system structure according to another embodiment of this application;

[0027] Figure 3 is a schematic diagram of the power amplifier system structure according to another embodiment of this application;

[0028] Figures 4a, 4b, 4c and 4d are schematic diagrams of relevant signals according to an embodiment of this application;

[0029] Figures 5a, 5b and 5c are schematic diagrams of a first current supply unit according to an embodiment of this application;

[0030] Figures 6a, 6b and 6c are schematic diagrams of a second current supply unit according to an embodiment of this application;

[0031] Figure 7 is a schematic diagram of the power amplifier system structure according to another embodiment of this application;

[0032] Figures 8a, 8b and 8c are schematic diagrams of the power amplifier system structure according to another embodiment of this application;

[0033] Figure 9a is a schematic diagram of the power amplifier system structure according to another embodiment of this application;

[0034] Figures 9b and 9c are schematic diagrams of relevant signals according to an embodiment of this application. Detailed Implementation

[0035] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In the absence of conflict, the following embodiments and their technical features can be combined with each other.

[0036] The first aspect of this application provides a signal generating device for a power amplification system, which provides a control signal to a power amplifier within the system to stabilize the output signal of the power amplifier. Referring to FIG1, the signal generating device includes a compensation module 100 and a signal amplification module 200.

[0037] The compensation module 100 is used to provide at least one compensation signal (such as compensation voltage or compensation current) to compensate for possible changes in the output signal of the power amplifier 300. The number and characteristics of the compensation signals provided by the compensation module 100 can be determined based on the possible changes in the output signal of the power amplifier 300 in the corresponding application scenario; for example, if the output signal of the power amplifier 300 increases with increasing temperature, the compensation module 100 can provide one gradually decreasing compensation signal; or if the output signal of the power amplifier 300 decreases over time, the compensation module 100 can provide one gradually increasing compensation signal; or the compensation module 100 can provide two or more compensation signals to compensate for changes in the power amplifier 300 after combining multiple compensation signals. Optionally, the compensation module 100 can output multiple compensation signals, such as simultaneously outputting multiple upward compensation signals (gradually increasing compensation signals), simultaneously outputting multiple downward compensation signals (gradually decreasing compensation signals), or simultaneously outputting at least one upward compensation signal and at least one downward compensation signal, etc. Optionally, the compensation module 100 includes multiple compensation branches, each of which can output a compensation signal.

[0038] The signal amplification module 200 amplifies the compensation signal so that the amplified compensation signal matches the bias / drive requirements of the power amplifier 300. For example, the amplified compensation signal can directly act on components such as the main bias circuit of the power amplifier 300. In this way, the compensation signal can compensate for the changes in the relevant signals in the power amplifier 300 with time and / or environmental factors, so that the output signal of the power amplifier 300 is not affected by environmental factors such as time and / or temperature, and is more stable. Moreover, the compensation signal provided by the compensation module 100 can be determined according to the possible changes in the power amplifier 300 in the corresponding application scenario, and is independent of the main bias circuit and other components in the power amplifier 300. It does not require changes to the internal structure and / or parameters of the power amplifier 300, and can be applied to multiple types of power amplifiers and multiple application scenarios, with higher flexibility.

[0039] Optionally, as shown in Figure 2, the signal amplification module 200 includes an operational amplifier Q, resistors Ra1 and Ra2; the first input terminal (non-inverting input terminal) of the operational amplifier Q serves as the input terminal of the signal amplification module 200 and is connected to the output terminal of the compensation module 100; the second input terminal (inverting input terminal) is connected to the first terminals of resistors Ra1 and Ra2 respectively; the second terminal of resistor Ra2 is grounded; the second terminal of resistor Ra1 is connected to the output terminal of the operational amplifier Q; the output terminal of the operational amplifier Q serves as the output terminal of the signal amplification module 200 and is used to output the amplified compensation signal.

[0040] In some embodiments, referring to FIG3, the compensation module 100 includes a reference current source I0, a first resistor R1, and at least one current supply unit (such as a first current supply unit 111 and / or a second current supply unit 112).

[0041] The input terminal of the reference current source I0 is used to connect to the first voltage Vdd1, and the output terminal is connected to the input terminal of the signal amplification module 200 to generate a reference current, which can be a bandgap reference current.

[0042] The output terminal of the current providing unit is connected to the output terminal of the reference current source I0, and is used to output a time-varying current in at least one direction to the output terminal of the reference current to generate a time-varying current. The time-varying current is superimposed on the reference current to form the compensation current.

[0043] The first resistor R1 is connected between the output terminal and ground terminal of the reference current source I0, and is used to convert the compensation current into a compensation voltage. This compensation voltage is used as a compensation signal input to the signal amplification module 200. The amplified compensation voltage output by the signal amplification module 200 can act on the main bias circuit and other components of the power amplifier 300 to compensate for possible changes in the output signal of the power amplifier 300.

[0044] In some examples, as shown in Figure 3, at least one current supply unit includes a first current supply unit 111 and / or a second current supply unit 112.

[0045] The first current providing unit 111 is used to provide a first superimposed current so that the corresponding compensation current has a downward compensation capability (e.g., to compensate for the increase of the corresponding signal). In this way, the subsequent compensation voltage can compensate for the possible increase of the output signal of the power amplifier 300. Specifically, the compensation current after the first superimposed current and the reference current are superimposed can be referred to Figure 4a. In Figure 4a, Ios represents the first superimposed current, and I0 represents the reference current. The compensation current after the two are superimposed is converted into a compensation voltage. This compensation voltage decreases over time, thus having a downward compensation capability, and can compensate for the increase of the relevant signal in the power amplifier 300. After being amplified by the signal amplification module 200, the compensation voltage is applied to the power amplifier 300. The output signal RFout of the power amplifier 300 may be as shown in Figure 4b. Figure 4b shows that when the output signal of the power amplifier 300 may increase due to environmental factors, the first current providing unit 111 provides a first superimposed current Ios. After corresponding processing, the power amplifier 300 is compensated, which can keep the output signal RFout of the power amplifier 300 within a stable range and improve the fidelity of the output signal RFout of the power amplifier 300.

[0046] The second current providing unit 112 is used to provide a second superimposed current so that the corresponding compensation current has an upward compensation capability (e.g., to compensate for the decrease in the corresponding signal). In this way, the subsequent compensation voltage can compensate for the possible decrease in the output signal of the power amplifier 300. Specifically, the compensation current after the second superimposed current and the reference current are superimposed can be referred to in Figure 4c. In Figure 4c, Ius represents the second superimposed current, and I0 represents the reference current. The compensation current after the two are superimposed is converted into a compensation voltage. This compensation voltage increases over time, thus having an upward compensation capability, and can compensate for the decrease in the relevant signal in the power amplifier 300. After being amplified by the signal amplification module 200, the compensation voltage is applied to the power amplifier 300. The output signal RFout of the power amplifier 300 may be as shown in Figure 4d. Figure 4d shows that when the output signal of the power amplifier 300 may decrease due to environmental factors, the second current providing unit 112 provides a second superimposed current Ius. After corresponding processing, the power amplifier 300 is compensated, which can keep the output signal RFout of the power amplifier 300 within a stable range and improve the fidelity of the output signal RFout of the power amplifier 300.

[0047] In some examples, as shown in Figure 5a, the first current providing unit 111 includes at least one pull-down current generating branch Ios, each pull-down current generating branch Ios being used to generate a first superimposed current. The first superimposed current has a falling rate (also referred to as a slope). Optionally, the amplitude and falling rate of the first superimposed current generated by each pull-down current generating branch Ios are different, so that the falling rate of the first superimposed current provided by the entire first current providing unit 111 can be adjusted by adjusting the pull-down current generating branch connected to the first current providing unit 111.

[0048] Specifically, referring to Figure 5b, the pull-down current generating branch Ios includes a first current source Ir_os, a first variable capacitor Ct_os, a first variable resistor Rt_os, and a first MOSFET M1; the first MOSFET M1 can be a PMOS transistor. The input terminal of the first current source Ir_os is used to connect to the second voltage Vdd2 and is connected to the first terminal of the first variable resistor Rt_os. The output terminal is connected to the first terminal of the first variable capacitor Ct_os and the gate of the first MOSFET M1. The second terminal of the first variable capacitor Ct_os is grounded. The source of the first MOSFET M1 is connected to the second terminal of the first variable resistor Rt_os, and the drain is connected to the output terminal of the reference current source I0. It can serve as the output terminal of the pull-down current generating branch Ios, outputting a first superimposed current Ios, which is superimposed on the reference current. The specific parameters of the first variable capacitor Ct_os and the first variable resistor Rt_os can be set according to the required rate of decrease of the corresponding first superimposed current Ios. For example, the first variable resistor Rt_os can be used to determine the maximum value of the first superimposed current Ios, and the first variable capacitor Ct_os can be used to determine the time when the first superimposed current Ios changes from the maximum value to the minimum value.

[0049] In the pull-down current generation branch Ios shown in Figure 5b, when the first current source Ir_os first provides current, the first MOSFET M1 is turned on, and the first superimposed current Ios reaches its maximum value. As the gate voltage of the first MOSFET M1 increases, the first superimposed current Ios gradually decreases, and its change process can be referred to as Ios in Figure 4a. When the gate voltage of the first MOSFET M1 rises to a certain level, the first MOSFET M1 is turned off, and the first superimposed current Ios is 0. Since the current direction of the first superimposed current Ios is consistent with the current direction of the reference current I0, the compensation current after their superposition is shown in Figure 4a. Optionally, the first current source Ir_os can be controlled by an enable signal. For example, the control terminal of the first current source Ir_os can be connected to an enable signal. When the enable signal is high, the first current source Ir_os provides the corresponding current; when the enable signal is low, the first current source Ir_os does not provide current.

[0050] Optionally, referring to Figure 5c, the first current providing unit 111 further includes a first switch S1 corresponding to each pull-down current generating branch Ios; the first switch S1 can be set between the drain of the first MOS transistor M1 and the output terminal of the reference current source I0, and is used to control the on / off state of the corresponding pull-down current generating branch Ios, that is, when it is necessary to turn on the pull-down current generating branch Ios, the corresponding first switch S1 is closed, and when it is necessary to turn off the pull-down current generating branch Ios, the corresponding first switch S1 is opened.

[0051] In some examples, as shown in Figure 6a, the second current providing unit includes at least one pull-up current generating branch Ius, each pull-up current generating branch Ius being used to generate a second superimposed current. The second superimposed current has a rising rate (also referred to as a slope). Optionally, the rising rates of the second superimposed current generated by each pull-up current generating branch Ius are different, so that the rising rate of the second superimposed current provided by the entire second current providing unit 112 can be adjusted by adjusting the pull-up current generating branches connected to the second current providing unit 112.

[0052] Specifically, referring to Figure 6b, the pull-up current generating branch Ius includes a second current source Ir_us, a second variable capacitor Ct_us, a second variable resistor Rt_us, a second MOS transistor M2, a third MOS transistor M3, and a fourth MOS transistor M4; wherein the second MOS transistor M2 is a PMOS transistor, and the third MOS transistor M3 and the fourth MOS transistor M4 are NMOS transistors respectively. The input terminal of the second current source Ir_us is connected to the third voltage Vdd3 and the first terminal of the second variable resistor Rt_us. Its output terminal is connected to the first terminal of the second variable capacitor Ct_us and the gate of the second MOSFET M2. The second terminal of the second variable capacitor Ct_us is grounded. The drain of the second MOSFET M2 is connected to the drain of the third MOSFET M3, the gate of the third MOSFET M3, and the gate of the fourth MOSFET M4. The source of the third MOSFET M3 is grounded. The source of the fourth MOSFET M4 is grounded, and its drain is connected to the output terminal of the reference current source I0. This can be used as the output terminal of the pull-up current generation branch Ius to output a second superimposed current Ius, which is then superimposed on the reference current. The specific parameters of the second variable capacitor Ct_us and the second variable resistor Rt_us can be set according to the required rise rate of the corresponding second superimposed current Ius. For example, the second variable resistor Rt_us can be used to determine the maximum value of the second superimposed current Ius, and the second variable capacitor Ct_us can be used to determine the time it takes for the second superimposed current Ius to change from its minimum value to its maximum value.

[0053] In the pull-up current generation branch Ius shown in Figure 6b, when the second current source Ir_us just starts to provide current, the second MOSFET M2 is turned on, and the drain current of the second MOSFET M2 reaches its maximum value. The third MOSFET M3 and the fourth MOSFET M4 form a mirror circuit, replicating the drain current of the second MOSFET M2 to obtain the second superimposed current Ius. Therefore, the second superimposed current Ius reaches its maximum value. As the gate voltage of the second MOSFET M2 increases, the drain current of the second MOSFET M2 gradually decreases. When the gate voltage of the second MOSFET M2 rises to a certain level, the second MOSFET M2 is turned off. At this time, the drain current of the second MOSFET M2, that is, the second superimposed current Ius, is 0. Since the current direction of the second superimposed current Ius is opposite to the current direction of the reference current I0, the compensation current after the two are superimposed is shown in Figure 4c. Optionally, the second current source Ir_us can be controlled by an enable signal. For example, the control terminal of the second current source Ir_us can be connected to an enable signal. When the enable signal is high, the second current source Ir_us provides the corresponding current. When the enable signal is low, the second current source Ir_us does not provide current.

[0054] Among them, the first voltage Vdd1, the second voltage Vdd2, and the third voltage Vdd3 can be the same voltage or they can be different voltages; for example, the three can be the same voltage, or they can be three different voltages, or any two of the three can be the same voltage and the other one can be a different voltage.

[0055] Optionally, referring to Figure 6c, the second current providing unit 112 further includes a second switch S2 corresponding to each pull-up current generating branch Ius; the second switch is disposed between the drain of the fourth MOS transistor M4 and the output terminal of the reference current source I0, and is used to control the on / off state of the corresponding pull-up current generating branch Ius, that is, when it is necessary to connect the pull-up current generating branch Ius, the corresponding second switch S2 is closed, and when it is necessary to turn off the pull-up current generating branch Ius, the corresponding second switch S2 is opened.

[0056] In some examples, referring to Figure 7, the compensation module 100 includes a first current providing unit 111 and a second current providing unit 112, specifically including at least one pull-down current generating branch Ios, at least one pull-up current generating branch Ius, and at least one first switch S1 corresponding to the pull-down current generating branch Ios, and at least one second switch S2 corresponding to the pull-up current generating branch Ius. Thus, the compensation module 100 can close at least one first switch S1 and connect the corresponding pull-down current generating branch Ios when a downward compensation voltage (also known as a negative compensation voltage) is needed, and close at least one second switch S2 and connect the corresponding pull-up current generating branch Ius when an upward compensation voltage (also known as a positive compensation voltage) is needed. In some scenarios, the compensation module 100 can also simultaneously connect at least a portion of the first switch S1 and at least a portion of the second switch S2 to provide a superimposed current with an appropriate rate of change.

[0057] Optionally, the signal generating device may further include a control module (not shown in the figure), which can be connected to each of the first switches S1 and each of the second switches S2 to control the on / off state of each of the first switches S1 and each of the second switches S2 according to the compensation requirements of the power amplifier 300. The control module can be implemented using a low-power chip such as a microcontroller. Optionally, the control module can load a control program according to the compensation requirements of the power amplifier 300 in each time period, so as to control the on / off state of each first switch S1 and second switch S2 according to the control program. For example, if the output signal of the power amplifier 300 may increase in the first time period and needs to be downward compensated, the output signal is within an acceptable range in the second time period, the output signal may decrease in the third time period and needs to be upward compensated, and the output signal decreases even more in the fourth time period and needs to be upward compensated even more significantly, then the control module can turn on a pull-up current generating branch Ios in the first time period, turn off all first switches S1 and second switches S2 in the second time period, turn on a pull-up current generating branch Ius in the third time period, and continue to turn on another pull-up current generating branch Ius in the fourth time period (providing a greater upward compensation by turning on two pull-up current generating branches Ius).

[0058] In some embodiments, referring to Figures 8a and 8b, the compensation module 100 includes a downward compensation branch 121 and / or an upward compensation branch 122. Specifically, when the compensation module 100 includes both the downward compensation branch 121 and the upward compensation branch 122, the downward compensation branch 121 and the upward compensation branch 122 each have a corresponding switch to activate one of them.

[0059] The downward compensation branch 121 is used to provide a first time-varying voltage that decreases over time. This first time-varying voltage is amplified by the signal amplification module 200 to obtain a downward compensation voltage, which can compensate for the change in the related signal in the power amplifier 300 that increases over time.

[0060] The upward compensation branch 122 is used to provide a second time-varying voltage that increases over time. This second time-varying voltage is amplified by the signal amplification module 200 to obtain an upward compensation voltage, which can compensate for the change in the related signal in the power amplifier 300 as it decreases over time.

[0061] In some examples, referring to Figure 8c, the signal generating device further includes a third switch S3 corresponding to the downward compensation branch 121 and a fourth switch S4 corresponding to the upward compensation branch 122. The third switch S3 is located between the output terminal of the downward compensation branch 121 and the input terminal of the signal amplification module 200, and is used to control the on / off state of the downward compensation branch 121; that is, the corresponding third switch S3 is closed when the downward compensation branch 121 needs to be connected, and opened when the downward compensation branch 121 needs to be disconnected. The fourth switch S4 is located between the output terminal of the upward compensation branch 122 and the input terminal of the signal amplification module 200, and is used to control the on / off state of the upward compensation branch 122; that is, the corresponding fourth switch S4 is closed when the upward compensation branch 122 needs to be connected, and opened when the upward compensation branch 122 needs to be disconnected.

[0062] Optionally, if the signal generating device further includes a control module, the third switch S3 and the fourth switch S4 can be connected to the control module respectively, so that the control module controls the on / off state of the third switch S3 and the fourth switch S4 according to the compensation requirements of the power amplifier 300.

[0063] In some examples, referring to Figure 9a, the downward compensation branch 121 includes a first voltage source V1, a second resistor R2, a third resistor R3, and a first capacitor C1. The first terminal of the first voltage source V1 is grounded, and its second terminal is connected to both the first terminal of the second resistor R2 and the first terminal of the first capacitor C1. The second terminal of the second resistor R2 serves as the output terminal of the downward compensation branch 121, and is connected to the second terminal of the first capacitor C1, the first terminal of the third resistor R3, and the input terminal of the signal amplification module 200. The second terminal of the third resistor R3 is grounded. If the signal generating device further includes a third switch S3, the second terminal of the second resistor R2 can be connected to the input terminal of the signal amplification module 200 via the third switch S3.

[0064] In the aforementioned downward compensation branch 121, when the first voltage source V1 just begins to provide voltage, the voltage at the output terminal of the downward compensation branch 121 (i.e., the second terminal of the second resistor R2) is the voltage provided by the first voltage source V1. Due to the charging effect of the first capacitor C1, the voltage at this output terminal gradually decreases and eventually forms a stable voltage. The voltage change process at this output terminal can be referred to Figure 9b, which is a first time-varying voltage that decreases over time.

[0065] Optionally, the first voltage source V1 can be controlled by an enable signal. For example, the control terminal of the first voltage source V1 can be connected to an enable signal. When the enable signal is high, the first voltage source V1 provides the corresponding voltage, and when the enable signal is low, the first voltage source V1 does not provide voltage.

[0066] In some examples, as shown in Figure 9a, the upward compensation branch 122 includes a second voltage source V2, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a second capacitor C2. The first terminal of the second voltage source V2 is grounded, and the second terminal is connected to the first terminal of the fourth resistor R4. The second terminal of the fourth resistor R4 serves as the output terminal of the upward compensation branch 122, and is connected to the first terminal of the fifth resistor R5, the first terminal of the second capacitor C2, and the input terminal of the signal amplification module 200, respectively. The second terminal of the fifth resistor R5 is connected to the second terminal of the second capacitor C2 and the first terminal of the sixth resistor R6, respectively. The second terminal of the sixth resistor R6 is grounded. If the signal generating device also includes a fourth switch S4, the second terminal of the fourth resistor R4 can be connected to the input terminal of the signal amplification module 200 through the fourth switch S4.

[0067] In the above-mentioned upward compensation branch 122, when the second voltage source V2 just starts to provide voltage, the voltage at the output terminal of the upward compensation branch 122 (i.e. the second terminal of the fourth resistor R4) is the voltage at the first terminal of the sixth resistor R6. Due to the charging effect of the second capacitor C2, the voltage at the output terminal gradually increases and eventually forms a stable voltage. The voltage change process at the output terminal can be referred to Figure 9c, which is the second time-varying voltage that increases with time.

[0068] Optionally, the second voltage source V2 can be controlled by an enable signal. For example, the control terminal of the second voltage source V2 can be connected to an enable signal. When the enable signal is high, the second voltage source V2 provides the corresponding voltage, and when the enable signal is low, the second voltage source V2 does not provide voltage.

[0069] In the above signal generating device, the compensation module 100 can provide at least one compensation signal according to the possible changes in the output signal of the power amplifier 300 in the corresponding application scenario, so as to compensate the output signal of the power amplifier 300. The signal amplification module 200 amplifies the above compensation signal and then applies it to the power amplifier 300. In this way, the compensation signal can compensate for the changes in the relevant signals in the power amplifier 300 with time and / or environmental factors, so that the output signal of the power amplifier 300 is not affected by environmental factors such as time and / or temperature, and is more stable. Moreover, the compensation signal provided by the compensation module 100 can be determined according to the possible changes in the power amplifier 300 in the corresponding application scenario, and is independent of the main bias circuit and other components in the power amplifier 300. It does not require changes to the internal structure and / or parameters of the power amplifier 300, and can be applied to multiple types of power amplifiers and multiple application scenarios, with higher flexibility.

[0070] It should be noted that in the above embodiments, one end of a device being connected to (or accessed) an object can be directly connected to (or accessed) the corresponding object. For example, the input terminal of the reference current source I0 being used to access the first voltage Vdd1 can be directly connected to the first voltage Vdd1. One end of a device being connected to (or accessed) an object can also be indirectly connected to (or accessed) the corresponding object. For example, the input terminal of the reference current source I0 being used to access the first voltage Vdd1 can also be connected to the first voltage Vdd1 through other components. That is, the input terminal of the reference current source I0 is first connected to one end of a component, and the other end of the component is then connected to the first voltage Vdd1. This application does not specifically limit this.

[0071] A second aspect of this application provides a signal generation method, which is applied to the signal generation apparatus described in any of the above embodiments, including steps S410 to S430.

[0072] S410, Obtain the compensation requirements of the power amplifier. This step S410 can perform tests and analyses on the power amplifier in the corresponding application scenario to obtain the variation characteristics of the power amplifier's output signal at different time periods in this type of application scenario, thereby determining the compensation requirements of the power amplifier; for example, in a certain type of application scenario, the output signal of the power amplifier may increase in the first time period, so the compensation requirement for the first time period is downward compensation; the output signal may decrease in the second time period, so the compensation requirement for the second time period is upward compensation.

[0073] S420, provide at least one compensation signal according to the compensation requirement. Specifically, step S420 can provide the compensation signal in time periods. For example, in the first time period, it can connect one pull-down current generating branch or downward compensation branch to provide a downward compensation signal; in the second time period, it can connect one pull-up current generating branch or upward compensation branch to provide an upward compensation signal; in the third time period, it can connect two pull-down current generating branches to further increase the amplitude of the downward compensation signal, and so on.

[0074] S430, amplify the compensation signal so that the amplified compensation signal matches the power amplifier and can directly act on the main bias circuit and other components of the power amplifier. In this way, the compensation signal can compensate for the changes in the relevant signals in the power amplifier with time and / or environmental factors, so that the output signal of the power amplifier is not affected by environmental factors such as time and / or temperature, and is more stable.

[0075] The above signal generation method, when applied to the signal generation device described in any of the above embodiments, has all the beneficial effects of the signal generation device described in any of the above embodiments, and will not be repeated here.

[0076] A third aspect of this application provides a power amplification system, as shown in Figures 1 to 3, wherein the power amplification system includes a power amplifier 300 and a signal generating device as described in any of the above embodiments.

[0077] Specifically, referring to Figures 2 and 3, the power amplifier 300 may include components such as a main bias circuit 310, a resistor Rb, an inductor L, a voltage source Vcc, a capacitor Cin, and a capacitor Cout. These components are connected accordingly. Under the action of the compensation signal output by the aforementioned signal generator, it can be applied to various application scenarios, and has a stable output signal in various application scenarios, thus having higher reliability.

[0078] The power amplifier described above includes the signal generating device described in any of the above embodiments, and has all the beneficial effects of the signal generating device described in any of the above embodiments, which will not be repeated here.

[0079] Although this application has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art based on a reading and understanding of this specification and drawings. This application includes all such modifications and variations and is limited only by the scope of the appended claims. In particular, with respect to the various functions performed by the aforementioned components, the terminology used to describe such components is intended to correspond to any component (unless otherwise indicated) that performs the specified function of said component (e.g., is functionally equivalent to it), even if structurally not equivalent to the disclosed structure performing the functions in the exemplary implementations of this specification shown herein.

[0080] That is, the above description is only an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural changes made using the content of this application’s specification and drawings, such as the combination of technical features between different embodiments, or direct or indirect application in other related technical fields, are similarly included within the patent protection scope of this application.

[0081] Furthermore, it should be understood that in the description of this application, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Additionally, for structural elements with the same or similar characteristics, this application may use the same or different reference numerals for identification. Moreover, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0082] In this application, the term "exemplary" is used to mean "serving as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as more preferred or advantageous than other embodiments. This application has been provided above to enable any person skilled in the art to implement and use it. Various details have been set forth in the above description for purposes of explanation. It should be understood that those skilled in the art will recognize that this application can be implemented without using these specific details. In other embodiments, well-known structures and processes will not be described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed herein.

Claims

1. A signal generating device, characterized in that, The signal generating device includes a compensation module and a signal amplification module; The compensation module is used to provide at least one compensation signal; The signal amplification module is used to amplify the compensation signal so that the amplified compensation signal matches the power amplifier.

2. The signal generating device according to claim 1, characterized in that, The compensation module includes a reference current source, a first resistor, and at least one current supply unit; The input terminal of the reference current source is used to connect to a first voltage, and the output terminal is connected to the input terminal of the signal amplification module to generate a reference current. The current providing unit is used to output a time-varying current in at least one direction to the output terminal of the reference current, and the time-varying current is superimposed on the reference current to form the compensation current; The first resistor is connected between the output terminal of the reference current source and the ground terminal, and is used to convert the compensation current into a compensation voltage.

3. The signal generating device according to claim 2, characterized in that, The at least one current providing unit includes a first current providing unit and / or a second current providing unit; The first current providing unit is used to provide a first superimposed current so that the corresponding compensation current has a downward compensation capability; The second current providing unit is used to provide a second superimposed current so that the corresponding compensation current has an upward compensation capability.

4. The signal generating device according to claim 3, characterized in that, The first current providing unit includes at least one pull-up current generating branch; The pull-up current generating branch includes a first current source, a first variable capacitor, a first variable resistor, and a first MOSFET; the input terminal of the first current source is used to connect to the second voltage and is connected to the first terminal of the first variable resistor, and the output terminal is connected to the first terminal of the first variable capacitor and the gate of the first MOSFET respectively. The second terminal of the first variable capacitor is grounded; the source of the first MOS transistor is connected to the second terminal of the first variable resistor, and the drain is connected to the output terminal of the reference current source.

5. The signal generating device according to claim 4, characterized in that, The first current providing unit also includes a first switch corresponding to each of the pull-up current generating branches; The first switch is located between the drain of the first MOS transistor and the output terminal of the reference current source, and is used to control the on / off state of the corresponding pull-up current generation branch.

6. The signal generating device according to claim 3, characterized in that, The second current supply unit includes at least one pull-down current generating branch; The pull-down current generating branch includes a second current source, a second variable capacitor, a second variable resistor, a second MOSFET, a third MOSFET, and a fourth MOSFET; the input terminal of the second current source is used to connect to the third voltage and is connected to the first terminal of the second variable resistor, and the output terminal is connected to the first terminal of the second variable capacitor and the gate of the second MOSFET respectively; the second terminal of the second variable capacitor is grounded; the drain of the second MOSFET is connected to the drain of the third MOSFET, the gate of the third MOSFET, and the gate of the fourth MOSFET respectively. The source of the third MOS transistor is grounded; the drain of the fourth MOS transistor is connected to the output terminal of the reference current source, and its source is grounded.

7. The signal generating device according to claim 6, characterized in that, The second current providing unit also includes a second switch corresponding to each of the pull-down current generating branches; The second switch is located between the drain of the fourth MOS transistor and the output terminal of the reference current source, and is used to control the on / off state of the corresponding pull-down current generation branch.

8. The signal generating device according to claim 1, characterized in that, The compensation module includes a downward compensation branch and / or an upward compensation branch; The downward compensation branch is used to provide a first time-varying voltage that decreases over time; The upward compensation branch is used to provide a second time-varying voltage that increases over time.

9. The signal generating device according to claim 8, characterized in that, The signal generating device further includes a third switch corresponding to the downward compensation branch and a fourth switch corresponding to the upward compensation branch; The third switch is located between the output terminal of the downward compensation branch and the input terminal of the signal amplification module, and is used to control the on / off state of the downward compensation branch. The fourth switch is located between the output terminal of the upward compensation branch and the input terminal of the signal amplification module, and is used to control the on / off state of the upward compensation branch.

10. The signal generating device according to claim 8, characterized in that, The downward compensation branch includes a first voltage source, a second resistor, a third resistor, and a first capacitor; The first terminal of the first voltage source is grounded, and the second terminal is connected to the first terminal of the second resistor and the first terminal of the first capacitor, respectively; the second terminal of the second resistor is connected to the second terminal of the first capacitor, the first terminal of the third resistor and the input terminal of the signal amplification module, respectively; the second terminal of the third resistor is grounded.

11. The signal generating device according to claim 8, characterized in that, The upward compensation branch includes a second voltage source, a fourth resistor, a fifth resistor, a sixth resistor, and a second capacitor; The first terminal of the second voltage source is grounded, and the second terminal is connected to the first terminal of the fourth resistor; the second terminal of the fourth resistor is connected to the first terminal of the fifth resistor, the first terminal of the second capacitor, and the input terminal of the signal amplification module; the second terminal of the fifth resistor is connected to the second terminal of the second capacitor and the first terminal of the sixth resistor; the second terminal of the sixth resistor is grounded.

12. A signal generation method, characterized in that, The signal generation method is applied to the signal generation apparatus according to any one of claims 1 to 11, comprising: Obtain the compensation requirements of the power amplifier; Provide at least one compensation signal according to the compensation requirements; The compensation signal is amplified so that the amplified compensation signal matches the power amplifier.

13. A power amplification system, characterized in that, The power amplification system includes a power amplifier and a signal generating device as described in any one of claims 1 to 11.

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