Active-Balun-Based Signal Conditioning Circuit, Method, and Signal Processing Device

Abstract

The signal conditioning circuit, method, and signal processing device based on an active balun provided by this application relate to the technical field of signal processing. In this application, the analog signal to be processed is subjected to DC component adjustment processing to form a DC component adjusted analog signal; the DC component adjusted analog signal is subjected to single-ended to differential conversion processing to form a differential analog signal; the differential analog signal is subjected to signal amplification processing to form a target analog signal; the voltage of the DC signal in the DC component adjusted analog signal is collected, and the corresponding DC signal acquisition voltage is output; a corresponding differential conversion control voltage is output based on the DC signal acquisition voltage; a differential conversion bias voltage is provided to the active balun unit based on the differential conversion control voltage, where the differential conversion bias voltage serves as the basis for single-ended to differential conversion processing. Based on the above, the problem in the prior art that it is difficult to reliably process analog signals can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of signal processing, and in particular, to a signal conditioning circuit, method, and signal processing device based on an active balun. Background Art

[0002] With the development of fields such as radar, communication, and electronic countermeasures, in broadband, high-speed signal acquisition and processing, and test and measurement systems, it is necessary to process radio frequency and microwave signals with a wider bandwidth (DC to 20 GHz) and a higher rate (80 GSa / s or higher). It is difficult for radio frequency devices to achieve full-band coverage. Generally, the signal is first segmented and frequency-divided, and then combined and output. Among them, the existing mainstream signal acquisition and processing platform can only reach a bandwidth of DC to 13 GHz and a sampling rate of 40 GSa / s; a higher bandwidth needs to be achieved through frequency conversion, and a higher sampling rate needs to be achieved through interleaving technology. However, the spurs and noise brought by frequency conversion will reduce the accuracy and reliability of the system. Although time-domain interleaving or frequency-domain interleaving technology can improve the bandwidth and sampling rate of signal acquisition through error correction and compensation, various mismatch errors between multiple parallel interleaved samplings will affect the waveform reconstructed by the digital backend, bringing pressure to the digital backend signal processing, and ultimately affecting the overall sampling accuracy and functional technical indicators of the data processing platform. To solve the above technical problems, a corresponding conditioning circuit is generally designed to condition the acquired analog signal. However, the inventor has found that in the prior art, there is a problem that it is difficult to reliably condition the analog signal during the signal conditioning process. Summary of the Invention

[0003] In view of this, the purpose of the present application is to provide a signal conditioning circuit, method, and signal processing device based on an active balun to improve the problem of difficult reliable processing of analog signals existing in the prior art.

[0004] To achieve the above purpose, the present application adopts the following technical solutions:

[0005] A signal conditioning circuit based on an active balun includes:

[0006] A coupling and transformation unit, where the coupling and transformation unit is used to receive an analog signal to be processed through an input end, perform DC component adjustment processing on the analog signal to be processed to form a DC component-adjusted analog signal, and output the DC component-adjusted analog signal through an output end;

[0007] Active balun unit, wherein the input end of the active balun unit is connected to the output end of the coupling transformation unit, and the active balun unit is configured to obtain the DC component adjustment analog signal, perform single-ended to differential processing on the DC component adjustment analog signal to form a differential analog signal, and output the differential analog signal through the output end;

[0008] Operational amplifier unit, wherein the input end of the operational amplifier unit is connected to the output end of the active balun unit, and the operational amplifier unit is configured to obtain the differential analog signal and perform signal amplification processing on the differential analog signal to form a target analog signal;

[0009] Voltage acquisition unit, wherein the input end of the voltage acquisition unit is connected to the output end of the coupling transformation unit, and the voltage acquisition unit is configured to acquire the voltage of the DC signal in the DC component adjustment analog signal and output the corresponding DC signal acquisition voltage through the output end;

[0010] Differential conversion control unit, wherein the input end of the differential conversion control unit is connected to the output end of the voltage acquisition unit, and the differential conversion control unit is configured to obtain the DC signal acquisition voltage and output the corresponding differential conversion control voltage based on the DC signal acquisition voltage;

[0011] Voltage feedback unit, wherein the input end of the voltage feedback unit is connected to the output end of the differential conversion control unit, and the voltage feedback unit is configured to obtain the differential conversion control voltage and provide a differential conversion bias voltage to the active balun unit based on the differential conversion control voltage, and the differential conversion bias voltage serves as the basis for the active balun unit to perform single-ended to differential processing.

[0012] In a preferred selection of the present application, in the above signal conditioning circuit based on an active balun, the voltage feedback unit includes:

[0013] Driver amplifier, wherein the positive input terminal of the driver amplifier is connected to the output end of the differential conversion control unit through a first resistor, and the driver amplifier is configured to amplify the differential conversion control voltage output by the differential conversion control unit and output it to the linear controllable power supply;

[0014] Linear controllable power supply, wherein the input end of the linear controllable power supply is connected to the output end of the driver amplifier through a second resistor, and the linear controllable power supply is configured to obtain the amplified differential conversion control voltage and perform voltage stabilization processing on the amplified differential conversion control voltage to form a differential conversion bias voltage;

[0015] Schottky diode, wherein the anode of the Schottky diode is connected to the output terminal of the linearly controllable power supply, and the cathode of the Schottky diode is connected to the DC bias voltage feedback control pin of the active balun unit to provide the differential conversion bias voltage;

[0016] First capacitor, wherein the first end of the first capacitor is connected to the cathode of the Schottky diode, and the second end of the first capacitor is grounded;

[0017] Third resistor, wherein the first end of the third resistor is connected to the non-inverting input terminal of the driver amplifier, and the second end of the third resistor is connected to the output terminal of the driver amplifier;

[0018] First bead, wherein the first end of the first bead is connected to the positive power supply terminal of the driver amplifier, and the second end of the first bead serves as the positive terminal for connecting the power supply voltage;

[0019] Second bead, wherein the first end of the second bead is connected to the negative power supply terminal of the driver amplifier, and the second end of the second bead serves as the negative terminal for connecting the power supply voltage.

[0020] In a preferred selection of the present application, in the above-mentioned signal conditioning circuit based on an active balun, the linearly controllable power supply includes:

[0021] Voltage regulator component, wherein the input terminal of the voltage regulator component is connected to the second resistor, and the output terminal of the voltage regulator component is connected to the anode of the Schottky diode;

[0022] Fourth resistor, wherein the first end of the fourth resistor is connected to the input terminal of the voltage regulator component, and the second end of the fourth resistor is connected to the cathode of the Schottky diode;

[0023] Fifth resistor, wherein the first end of the fifth resistor is connected to the input of the voltage regulator component, and the second end of the fifth resistor is grounded.

[0024] In a preferred selection of the present application, in the above-mentioned signal conditioning circuit based on an active balun, the voltage regulator component includes:

[0025] Error amplifier, wherein the non-inverting input terminal of the error amplifier is connected to the second resistor, and the inverting input terminal of the error amplifier serves as the connection terminal for the reference voltage;

[0026] First controller, wherein the input terminal of the first controller is connected to the output terminal of the error amplifier;

[0027] A first field-effect transistor, wherein the gate of the first field-effect transistor is connected to the output terminal of the first controller, the source of the first field-effect transistor is grounded, and the drain of the first field-effect transistor is connected to the anode of the Schottky diode.

[0028] In a preferred selection of the present application, in the above-mentioned signal conditioning circuit based on an active balun, the signal conditioning circuit based on an active balun further includes:

[0029] A power-on timing control unit, wherein the power-on timing control unit is connected to the power supply terminal of the active balun unit, and the power-on timing control unit is used to control the power-on timing of the positive power supply terminal of the active balun unit to be later than the power-on timing of the negative power supply terminal of the active balun unit.

[0030] In a preferred selection of the present application, in the above-mentioned signal conditioning circuit based on an active balun, the power-on timing control unit includes:

[0031] A second field-effect transistor, wherein the source of the second field-effect transistor is connected to the positive terminal of an external power supply, and the drain of the second field-effect transistor is connected to the positive power supply terminal of the active balun unit;

[0032] A second capacitor, wherein the first end of the second capacitor is connected to the source of the second field-effect transistor, and the second end of the second capacitor is grounded;

[0033] A sixth resistor, wherein the first end of the sixth resistor is connected to the source of the second field-effect transistor, and the second end of the sixth resistor is connected to the gate of the second field-effect transistor;

[0034] A first triode, wherein the collector of the first triode is connected to the gate of the second field-effect transistor;

[0035] A seventh resistor, wherein the first end of the seventh resistor is connected to the base of the first triode, and the second end of the seventh resistor is grounded;

[0036] An eighth resistor, wherein the first end of the eighth resistor is connected to the emitter of the first triode, and the second end of the eighth resistor is grounded;

[0037] A ninth resistor, wherein the first end of the ninth resistor is connected to the emitter of the first triode, and the second end of the ninth resistor is connected to the negative power supply terminal of the active balun unit and the negative terminal of the external power supply;

[0038] A third capacitor, wherein the first end of the third capacitor is connected to the first end of the ninth resistor, and the second end of the third capacitor is connected to the second end of the ninth resistor;

[0039] After the positive terminal and the negative terminal of the external power supply are respectively powered, the negative power supply terminal of the active balun unit is powered on through the negative terminal of the external power supply, and the first triode is turned on based on the power supply of the negative terminal of the external power supply, so that the gate of the second field effect transistor provides a negative voltage provided by the negative terminal of the external power supply. After the positive voltage provided by the positive terminal of the external power supply is applied to the source of the second field effect transistor, the second field effect transistor is turned on, so that the positive voltage provided by the positive terminal of the external power supply is applied to the positive power supply terminal of the active balun unit, thereby controlling the power-on timing of the positive power supply terminal of the active balun unit to be later than the power-on timing of the negative power supply terminal of the active balun unit.

[0040] In a preferred selection of the present application, in the above signal conditioning circuit based on an active balun, the voltage acquisition unit includes:

[0041] An operational amplifier, wherein the non-inverting input terminal of the operational amplifier is connected to the output terminal of the coupling transformation unit through a tenth resistor to obtain the voltage of the DC signal in the DC component adjusted analog signal, and the inverting input terminal of the operational amplifier is grounded through an eleventh resistor and connected to the output terminal of the operational amplifier through a twelfth resistor to form a feedback loop;

[0042] A thirteenth resistor, wherein the first end of the thirteenth resistor is connected to the output terminal of the operational amplifier, and the second end of the thirteenth resistor is used as the output terminal of the voltage acquisition unit, so that the DC signal acquisition voltage formed by the operational amplifier amplifying the DC signal of the DC component adjusted analog signal is output through this output terminal;

[0043] A third magnetic bead, wherein the first end of the third magnetic bead is connected to the positive power supply terminal of the operational amplifier, and the second end of the third magnetic bead is used as the positive terminal for connecting the power supply voltage;

[0044] A fourth magnetic bead, wherein the first end of the fourth magnetic bead is connected to the negative power supply terminal of the operational amplifier, and the second end of the fourth magnetic bead is used as the negative terminal for connecting the power supply voltage.

[0045] On the above basis, the present application further provides a signal conditioning method based on an active balun, which is applied to the above signal conditioning circuit based on an active balun. The signal conditioning method based on an active balun includes:

[0046] Receiving a to-be-processed analog signal through the coupling transformation unit, and performing DC component adjustment processing on the to-be-processed analog signal to form a DC component adjusted analog signal;

[0047] Obtain the DC component adjustment analog signal through the active balun unit, and perform single-ended to differential processing on the DC component adjustment analog signal to form a differential analog signal;

[0048] Obtain the differential analog signal through the operational amplifier unit, and perform signal amplification processing on the differential analog signal to form a target analog signal;

[0049] Collect the voltage of the DC signal in the DC component adjustment analog signal through the voltage acquisition unit, and output the corresponding DC signal acquisition voltage;

[0050] Obtain the DC signal acquisition voltage through the differential conversion control unit, and output the corresponding differential conversion control voltage based on the DC signal acquisition voltage;

[0051] Obtain the differential conversion control voltage through the voltage feedback unit, and provide a differential conversion bias voltage to the active balun unit based on the differential conversion control voltage, where the differential conversion bias voltage is used as the basis for the active balun unit to perform single-ended to differential processing.

[0052] In a preferred selection of the present application, in the above signal conditioning method based on an active balun, the signal conditioning circuit based on an active balun further includes a power-on timing control unit, and the signal conditioning method based on an active balun further includes:

[0053] Control the power-on timing of the positive power supply terminal of the active balun unit to be later than the power-on timing of the negative power supply terminal of the active balun unit through the power-on timing control unit.

[0054] On the above basis, the present application further provides a signal processing device, including:

[0055] The above signal conditioning circuit based on an active balun;

[0056] An analog-to-digital conversion circuit, where the input end of the analog-to-digital conversion circuit is connected to the output end of the signal conditioning circuit based on an active balun, and the analog-to-digital conversion circuit is used to perform analog-to-digital conversion processing on the target analog signal output by the signal conditioning circuit based on an active balun to form a target digital signal.

[0057] The signal conditioning circuit, method, and signal processing device based on an active balun provided by this application perform DC component adjustment processing on the analog signal to be processed to form an analog signal with DC component adjustment; perform single-ended to differential conversion processing on the analog signal with DC component adjustment to form a differential analog signal; perform signal amplification processing on the differential analog signal to form a target analog signal; collect the voltage of the DC signal in the analog signal with DC component adjustment and output the corresponding DC signal acquisition voltage; output the corresponding differential conversion control voltage based on the DC signal acquisition voltage; and provide a differential conversion bias voltage to the active balun unit based on the differential conversion control voltage. Based on the above, since the differential conversion bias voltage will be used as the basis for single-ended to differential conversion processing, the reliability of single-ended to differential conversion processing is higher, thereby ensuring the reliability of the output differential analog signal to achieve reliable conditioning of the analog signal and improving the problem in the prior art that it is difficult to reliably process the analog signal. Description of the Drawings

[0058] To make the above objects, features, and advantages of this application more obvious and understandable, the following specific preferred embodiments are given in conjunction with the accompanying drawings and are described in detail as follows.

[0059] Figure 1 Schematic diagram of the signal processing device provided by the embodiment of this application.

[0060] Figure 2 Schematic diagram of the signal conditioning circuit based on an active balun provided by the embodiment of this application.

[0061] Figure 3 Application schematic diagram of the voltage feedback unit provided by the embodiment of this application.

[0062] Figure 4 Application schematic diagram of the linear controllable power supply provided by the embodiment of this application.

[0063] Figure 5 Circuit schematic diagram of the power-on timing control unit provided by the embodiment of this application.

[0064] Figure 6 Application schematic diagram of the voltage acquisition unit provided by the embodiment of this application.

[0065] Figure 7 Application schematic diagram of the differential conversion control unit provided by the embodiment of this application.

[0066] Figure 8 Circuit schematic diagram of the coupling transformation unit provided by the embodiment of this application.

[0067] Figure 9 Circuit schematic diagram of the active balun unit provided by the embodiment of this application.

[0068] Figure 10 Schematic diagram of the frequency response characteristic curve of the active balun unit provided by the embodiment of the present application.

[0069] Figure 11 Schematic diagram of the circuit of the operational amplifier unit provided by the embodiment of the present application.

[0070] Figure 12 Schematic diagram of the steps included in the signal conditioning method based on an active balun provided by the embodiment of the present application.

[0071] Icon: D - Schottky diode, C1 - First capacitor, R1 - First resistor, Second resistor R2, R3 - Third resistor, L1 - First bead, L2 - Second bead, R4 - Fourth resistor, R5 - Fifth resistor, Q1 - First field - effect transistor, L5 - Inductive device, Q2 - Second field - effect transistor, C2 - Second capacitor, C3 - Third capacitor, R6 - Sixth resistor, R7 - Seventh resistor, R8 - Eighth resistor, R9 - Ninth resistor, K - First triode, U1 - Operational amplifier, R10 - Tenth resistor, R11 - Eleventh resistor, R12 - Twelfth resistor, R13 - Thirteenth resistor, L3 - Third bead, L4 - Fourth bead. Detailed implementation manners

[0072] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Usually, the components of the embodiments of the present application described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0073] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but merely represents the selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0074] As Figure 1 shown, the embodiment of the present application provides a signal processing device. Among them, the signal processing device may include a signal conditioning circuit based on an active balun and an analog - to - digital conversion circuit.

[0075] Specifically, the active balun-based signal conditioning circuit can be used to perform corresponding conditioning (such as amplification processing) on the received analog signal to be processed, so as to output a target analog signal. The input end of the analog-to-digital conversion circuit is connected to the output end of the active balun-based signal conditioning circuit, and the analog-to-digital conversion circuit is used to perform analog-to-digital conversion processing on the target analog signal output by the active balun-based signal conditioning circuit to form a target digital signal.

[0076] Combined with Figure 2 As shown, an embodiment of the present application further provides an active balun-based signal conditioning circuit, and the active balun-based signal conditioning circuit can be applied to the above signal processing device. Among them, the active balun-based signal conditioning circuit may include a coupling transformation unit, an active balun unit, an operational amplification unit, a voltage acquisition unit, a differential conversion control unit, and a voltage feedback unit.

[0077] Specifically, the coupling transformation unit is used to receive the analog signal to be processed through the input end, perform DC component adjustment processing on the analog signal to be processed to form a DC component adjusted analog signal, and output the DC component adjusted analog signal through the output end. The input end of the active balun unit is connected to the output end of the coupling transformation unit, and the active balun unit is used to obtain the DC component adjusted analog signal, perform single-ended to differential processing on the DC component adjusted analog signal to form a differential analog signal, and output the differential analog signal through the output end. The input end of the operational amplification unit is connected to the output end of the active balun unit, and the operational amplification unit is used to obtain the differential analog signal and perform signal amplification processing on the differential analog signal to form a target analog signal. The input end of the voltage acquisition unit is connected to the output end of the coupling transformation unit, and the voltage acquisition unit is used to collect the voltage of the DC signal in the DC component adjusted analog signal and output the corresponding DC signal acquisition voltage through the output end. The input end of the differential conversion control unit is connected to the output end of the voltage acquisition unit, and the differential conversion control unit is used to obtain the DC signal acquisition voltage and output the corresponding differential conversion control voltage based on the DC signal acquisition voltage. The input end of the voltage feedback unit is connected to the output end of the differential conversion control unit, and the voltage feedback unit is used to obtain the differential conversion control voltage and provide a differential conversion bias voltage to the active balun unit based on the differential conversion control voltage, and the differential conversion bias voltage serves as the basis for the active balun unit to perform single-ended to differential processing.

[0078] Based on the above, since the differential conversion bias voltage is used as the basis for single-ended to differential processing, the reliability of single-ended to differential processing is higher, thus ensuring the reliability of the output differential analog signal to achieve reliable conditioning of the analog signal and improving the problem in the prior art that it is difficult to reliably process the analog signal.

[0079] It should be noted that for the voltage feedback unit, the specific composition of the voltage feedback unit is not limited and can be selected according to actual needs.

[0080] For example, in an alternative embodiment, in combination with Figure 3 , the voltage feedback unit may include a driving amplifier, a linear controllable power supply, a Schottky diode D, a first capacitor C1, a first resistor R1, a second resistor R2, a third resistor R3, a first magnetic bead L1, and a second magnetic bead L2.

[0081] Specifically, the non-inverting input terminal of the driving amplifier is connected to the output terminal of the differential conversion control unit through the first resistor R1. The driving amplifier is configured to amplify the differential conversion control voltage output by the differential conversion control unit and output it to the linear controllable power supply. The input terminal of the linear controllable power supply is connected to the output terminal of the driving amplifier through the second resistor R2. The linear controllable power supply is configured to obtain the amplified differential conversion control voltage and perform voltage stabilization processing on the amplified differential conversion control voltage to form a differential conversion bias voltage. The anode of the Schottky diode D is connected to the output terminal of the linear controllable power supply, and the cathode of the Schottky diode D is connected to the DC bias voltage feedback control pin of the active balun unit to provide the differential conversion bias voltage. The first end of the first capacitor C1 is connected to the cathode of the Schottky diode D, and the second end of the first capacitor C1 is grounded. The first end of the third resistor R3 is connected to the non-inverting input terminal of the driving amplifier, and the second end of the third resistor R3 is connected to the output terminal of the driving amplifier. The first end of the first magnetic bead L1 is connected to the positive power supply terminal of the driving amplifier, and the second end of the first magnetic bead L1 serves as the positive terminal connected to the power supply voltage. The first end of the second magnetic bead L2 is connected to the negative power supply terminal of the driving amplifier, and the second end of the second magnetic bead L2 serves as the negative terminal connected to the power supply voltage.

[0082] It should be noted that for the linear controllable power supply, the specific composition of the linear controllable power supply is not limited and can be selected according to actual needs.

[0083] For example, in an alternative embodiment, in combination with Figure 4 , the linear controllable power supply may include a voltage stabilizing component, a fourth resistor R4, and a fifth resistor R5.

[0084] Specifically, the input end of the voltage stabilizing component is connected to the second resistor R2, and the output end of the voltage stabilizing component is connected to the anode of the Schottky diode D. The first end of the fourth resistor R4 is connected to the input end of the voltage stabilizing component, and the second end of the fourth resistor R4 is connected to the cathode of the Schottky diode D. The first end of the fifth resistor R5 is connected to the input of the voltage stabilizing component, and the second end of the fifth resistor R5 is grounded.

[0085] Regarding the voltage stabilizing component, it should be noted that the specific composition of the voltage stabilizing component is not limited and can be selected according to actual needs.

[0086] For example, in an alternative embodiment, the voltage stabilizing component may include an error amplifier, a first controller, and a first field effect transistor Q1.

[0087] Specifically, the positive input terminal of the error amplifier is connected to the second resistor R2, and the negative input terminal of the error amplifier serves as the connection terminal for the reference voltage. The input terminal of the first controller is connected to the output terminal of the error amplifier. The gate of the first field effect transistor Q1 is connected to the output terminal of the first controller, the source of the first field effect transistor Q1 is grounded, and the drain of the first field effect transistor Q1 is connected to the anode of the Schottky diode D.

[0088] Among them, in an alternative embodiment, the voltage stabilizing component may further include an inductor component L5. Among them, the inductor component L5 may also be a magnetic bead and may be connected between the power supply of the linear controllable power supply (such as Figure 4 VBATT in) that can supply power to each device of the linear controllable power supply, such as supplying power to the first controller, etc.) and the drain of the first field effect transistor Q1 to provide a filtering effect.

[0089] Based on the above embodiments, considering the electrical safety of the active balun unit, the signal conditioning circuit based on the active balun may further include a power-on sequence control unit.

[0090] Specifically, the power-on sequence control unit is connected to the power supply terminal of the active balun unit, and the power-on sequence control unit is used to control the power-on sequence of the positive power supply terminal of the active balun unit to be later than the power-on sequence of the negative power supply terminal of the active balun unit.

[0091] Regarding the power-on sequence control unit, it should be noted that the specific composition of the power-on sequence control unit is not limited and can be selected according to actual needs.

[0092] For example, in an alternative embodiment, in combination with Figure 5, the power-on timing control unit may include a second field effect transistor Q2, a second capacitor C2, a third capacitor C3, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a first triode K.

[0093] Specifically, the source of the second field effect transistor Q2 is connected to the positive terminal of the external power supply, and the drain of the second field effect transistor Q2 is connected to the positive power supply terminal of the active balun unit. The first end of the second capacitor C2 is connected to the source of the second field effect transistor Q2, and the second end of the second capacitor C2 is grounded. The first end of the sixth resistor R6 is connected to the source of the second field effect transistor Q2, and the second end of the sixth resistor R6 is connected to the gate of the second field effect transistor Q2. The collector of the first triode K is connected to the gate of the second field effect transistor Q2. The first end of the seventh resistor R7 is connected to the base of the first triode K, and the second end of the seventh resistor R7 is grounded. The first end of the eighth resistor R8 is connected to the emitter of the first triode K, and the second end of the eighth resistor R8 is grounded. The first end of the ninth resistor R9 is connected to the emitter of the first triode K, and the second end of the ninth resistor R9 is connected to the negative power supply terminal of the active balun unit and the negative terminal of the external power supply. The first end of the third capacitor C3 is connected to the first end of the ninth resistor R9, and the second end of the third capacitor C3 is connected to the second end of the ninth resistor R9.

[0094] Wherein, after the positive terminal and the negative terminal of the external power supply are respectively powered, the negative power supply terminal of the active balun unit is powered on through the negative terminal of the external power supply, and the first triode K is turned on based on the power supply of the negative terminal of the external power supply, so that the negative voltage provided by the negative terminal of the external power supply is applied to the gate of the second field effect transistor Q2. Thus, after the positive voltage provided by the positive terminal of the external power supply is applied to the source of the second field effect transistor Q2, the second field effect transistor Q2 is turned on, so that the positive voltage provided by the positive terminal of the external power supply is applied to the positive power supply terminal of the active balun unit, and further controls the power-on timing of the positive power supply terminal of the active balun unit to be later than the power-on timing of the negative power supply terminal of the active balun unit.

[0095] It should be noted that for the voltage acquisition unit, the specific composition of the voltage acquisition unit is not limited and can be selected according to actual needs.

[0096] For example, in an alternative embodiment, in combination with Figure 6 , the voltage acquisition unit may include an operational amplifier U1, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a third bead L3, and a fourth bead L4.

[0097] Specifically, the positive input terminal of the operational amplifier U1 is connected to the output terminal of the coupling and transformation unit through the tenth resistor R10 to obtain the voltage of the DC signal in the DC component adjustment analog signal. The negative input terminal of the operational amplifier U1 is grounded through the eleventh resistor R11 and connected to the output terminal of the operational amplifier U1 through the eleventh resistor R11 to form a feedback loop. The first terminal of the thirteenth resistor R13 is connected to the output terminal of the operational amplifier U1, and the second terminal of the thirteenth resistor R13 serves as the output terminal of the voltage acquisition unit, so that the DC signal acquisition voltage formed by the operational amplifier U1 amplifying the DC signal of the DC component adjustment analog signal is output through this output terminal. The first terminal of the third magnetic bead L3 is connected to the positive power supply terminal of the operational amplifier U1, and the second terminal of the third magnetic bead L3 serves as the positive terminal connected to the power supply voltage. The first terminal of the fourth magnetic bead L4 is connected to the negative power supply terminal of the operational amplifier U1, and the second terminal of the fourth magnetic bead L4 serves as the negative terminal connected to the power supply voltage.

[0098] Regarding the differential conversion control unit, it should be noted that the specific composition of the differential conversion control unit is not limited and can be selected according to actual requirements.

[0099] For example, in an alternative embodiment, in combination with Figure 7 , the differential conversion control unit includes an analog-to-digital converter, a second controller, and a digital-to-analog converter.

[0100] Specifically, the input terminal of the analog-to-digital converter is connected to the output terminal of the voltage acquisition unit. The analog-to-digital converter is used to obtain the DC signal acquisition voltage and output a corresponding acquisition voltage digital signal based on the DC signal acquisition voltage. The input terminal of the second controller is connected to the output terminal of the analog-to-digital converter. The second controller is used to obtain the acquisition voltage digital signal and output a corresponding feedback voltage digital signal based on the acquisition voltage digital signal. The input terminal of the digital-to-analog converter is connected to the output terminal of the second controller, and the output terminal of the digital-to-analog converter is connected to the input terminal of the voltage feedback unit. The digital-to-analog converter is used to obtain the feedback voltage digital signal and output a corresponding differential conversion control voltage to the voltage feedback unit based on the feedback voltage digital signal.

[0101] It should be noted that the model of the driving amplifier can be AD8051, which is mainly used to control and transmit circuit signals. Its main functions are to output low-level signals to high levels and to amplify signals, amplifying weak signals to a certain level for subsequent processing. The model of the error amplifier can also be AD8051. In addition, the specific types of the first controller and the second controller are not limited. For example, they can include, but are not limited to, various microcontrollers, DSP chips, FPGA chips, SOC chips, CPU chips, etc.

[0102] It should be noted that the specific types of the coupling transformation unit, the active balun unit, and the operational amplifier unit are not limited. For example, the coupling transformation unit can be used to shield DC signals and pass AC signals, and its specific composition will be described later. The active balun unit can have the functions of converting single-ended to differential and achieving a certain coefficient of gain (an active balun can convert the input single-ended signal into a differential signal. Moreover, traditional transformers or baluns are passive devices, and even if they can meet the transmission of high-frequency signals, they cannot meet the transmission of DC signals, and can only reach the transmission of frequency signals at the kilohertz level at most), and its specific composition will be described later. The operational amplifier unit can be a gain-adjustable operational amplifier circuit (for example, it can be controlled by a controller through a serial port to amplify the input differential signal with variable gain to adapt to the conditioning and amplification of analog signals with a wide voltage input range, so that the amplitude of the analog signal output to the subsequent analog-to-digital converter is close to the full scale of the analog-to-digital converter, enabling the analog-to-digital converter to work in the state with the highest resolution and optimal performance when the amplitude of the input signal is close to the full scale), and its specific composition will be described later. Among them, two resistors are connected between the active balun unit and the operational amplifier unit.

[0103] Specifically, in combination with Figure 8 , in a specific application example, the coupling transformation unit can include an input port (such as Figure 8 VIN in Figure 8 ), an output port (such as Figure 8 VOUT in Figure 8 ), a positive power supply port (such as Figure 8 VS+ in Figure 8 ), a negative power supply port (such as Figure 8 VS- in Figure 8 ), and a DC bias voltage feedback port (such as Figure 8 VG in Figure 8 ). Among them, the input signal is clamped within the safe range of the positive power supply port and the negative power supply port through two diodes (such as Figure 8 D11 and D12 in Figure 8 ), the input signal is input from the gate of the field effect transistor (such as Figure 8 Q11 in Figure 8 ), and is output from the drain to the subsequent amplifier (such as Figure 8 Q12 in Figure 8Q12) in is supplied with positive power by the positive power supply port through a resistor (such as Figure 8 R15) in, and the negative power supply port supplies negative power to it. The decoupling capacitor (such as Figure 8 C11) in filters the positive power supply for it. The signal output after passing through the amplifier (such as Figure 8 Q12) in is the output signal of the coupling transformation unit. Moreover, by adjusting the magnitude of the voltage at the DC bias voltage feedback port to be equal to the DC bias voltage of the input signal, it can be made such that the DC voltage from it through the resistor (such as Figure 8 R17) in to the amplifier (such as Figure 8 Q12) in cancels out the DC voltage of the input signal from through the resistor (such as Figure 8 R16) in to the amplifier (such as Figure 8 Q12) in. Based on this, when the positive power supply port supplies power to the source electrode of the field effect transistor (such as Figure 8 Q11) in, the field effect transistor (such as Figure 8 Q11) in conducts, and the AC component of the input signal is output to the subsequent amplifier (such as Figure 8 Q12) in, and the subsequent amplifier (such as Figure 8 Q12) in amplifies the input AC signal to a certain extent.

[0104] Specifically, in combination with Figure 9 , in a specific application example, the active balun unit may include a single - ended input port (such as Figure 9 VIN) in, a differential output port (such as Figure 9 VOIUTP) in, a differential output port (such as Figure 9 VOUTN) in, a positive power supply port (such as Figure 9 VDD) in, and a negative power supply port (such as Figure 9 VSS) in. Among them, the core devices of the active balun unit are two field effect transistors (such as Figure 9 Q21 and Q22) in, and moreover, they are both supplied with power to their gates by the same positive power supply port through two resistors (such as Figure 9 R22 and R23) in, and are respectively filtered for their positive power supply by two decoupling capacitors (such as Figure 9 C21 and C22) in. The input signal passes through the resistor (such as Figure 9 R21) in and is power - divided to the drain of the field effect transistor (such as Figure 9 Q22) in the positive - terminal path and the gate of the field effect transistor (such as Figure 9 Q21) in the negative - terminal path. In the positive - terminal path, the source electrode of the field effect transistor (such as Figure 9 Q22) in passes through the resistor (such as Figure 9The positive terminal signal is output by R27), and the negative power supply port provides negative power supply for its gate through a resistor (such as Figure 9 R25) in it, and the decoupling capacitor (such as Figure 9 C24) in it filters the negative power supply for it; when the source, negative power supply port, gate, and positive power supply port of the field effect transistor (such as Figure 9 Q22) in it are turned on, the field effect transistor in the positive terminal path (such as Figure 9 Q22) in it conducts, and the positive terminal signal is output. In the negative terminal path, the source of the field effect transistor (such as Figure 9 Q21) in it is grounded, and the drain outputs the negative terminal signal through a resistor (such as Figure 9 R26) in it, and the negative power supply port provides negative power supply for its drain through a resistor (such as Figure 9 R24) in it, and the decoupling capacitor (such as Figure 9 C23) in it filters the negative power supply for it; when the gate and positive power supply port of the field effect transistor (such as Figure 9 Q21) in it are turned on, the field effect transistor in the negative terminal path (such as Figure 9 Q21) in it conducts, and the negative terminal signal is output.

[0105] In the circuit of the active balun unit, the source voltage of the field effect transistor (such as Figure 9 Q22) in it is obtained by voltage division of the voltage provided by the positive power supply port through the field effect transistor (such as Figure 9 Q21) to the ground. Therefore, when the external power supply supplies power to the negative power supply port, its power supply loop is an external reverse injection output, rather than an input and then a return output through the ground, so that the above-mentioned adaptive linearly adjustable LCD output voltage circuit is required to supply power to it (exemplarily, this negative power supply port can refer to the above-mentioned DC bias voltage feedback control pin, that is, the output end of the above-mentioned adaptive linearly adjustable LCD output voltage circuit can be connected to this negative power supply port. Thus, due to the different magnitudes of the input signals, different amplification coefficients are required for it. Therefore, it is necessary to dynamically adjust the power supply to the negative power supply port, that is, the above-mentioned adaptive linearly adjustable LCD output voltage circuit can dynamically adjust according to the collected DC signal acquisition voltage, that is, the above-mentioned provides a differential conversion bias voltage to the active balun unit, and the differential conversion bias voltage is used as the basis for the active balun unit to perform single-ended to differential processing). At the same time, through this circuit, it can be found that the source of the field effect transistor in the positive terminal path (such as Figure 9 Q22) in it outputs the positive terminal signal, and the drain of the field effect transistor in the positive terminal path (such as Figure 9 Q22) in it is connected to the gate of the field effect transistor in the negative terminal path (such as Figure 9 Q21) in it; the field effect transistor in the negative terminal path (such as Figure 9The drain output negative terminal signal of Q21) in has its source grounded. The entire circuit has a symmetric structure. Therefore, to ensure the output balance of single-ended to differential conversion and for the two field-effect transistors to operate well in the linear region, the DC bias of their input signals needs to be close to 0V. Based on the aforementioned active balun unit configuration, its frequency response characteristic curve has good flatness, as Figure 10 .

[0106] Specifically, in combination with Figure 11 , in a specific application example, the operational amplifier unit may include a differential input port (such as VINP in Figure 11 ), a differential input port (such as VINN in Figure 11 ), a differential output port (such as VOUTP in Figure 11 ), a differential output port (such as VOUTN in Figure 11 ), two programmable impedance arrays, and an amplifier (such as Q31 in Figure 11 ). Among them, the differential analog signal (such as the aforementioned differential analog signal) is input into the operational amplifier unit through the differential input ports (such as VINP and VINN in Figure 11 ). The two signals respectively control the programmable impedance arrays (which is a network composed of multiple adjustable impedances (usually composed of resistors or potentiometers). It can dynamically adjust the value of each impedance through programmable signals to provide precise impedance matching to optimize signal transmission and minimize reflections) for matching attenuation of the input signals through the corresponding programmable signals (for example, provided by a controller connected through a serial port). The attenuated signals are output to an amplifier (such as Q31 in Figure 11 ). The amplifier (such as Q31 in Figure 11 ) is powered by the positive and negative power supplies connected through the positive power supply port (such as VS+ in Figure 11 ) and the negative power supply port (such as VS- in Figure 11 ), and the positive and negative power supplies are respectively filtered by a decoupling capacitor (such as C33 and C34 in Figure 11 ). For the differential signals input to the amplifier (such as Q31 in Figure 11 ), they are respectively feedback amplified and compensated with corresponding coefficients through the RC feedback network (such as R31&C31 and R32&C32 in Figure 11 ), and finally, differential signals (such as the aforementioned target analog signal) are output through the differential output ports (such as VOUTP and VOUTN in Figure 11 ).

[0107] In combination with Figure 12, an embodiment of the present application further provides a signal conditioning method based on an active balun, which can be applied to the above-mentioned signal conditioning circuit based on an active balun. Among them, the signal conditioning method based on an active balun may include the following steps:

[0108] Step S110: Receive the analog signal to be processed through the coupling and transformation unit, and perform DC component adjustment processing on the analog signal to be processed to form a DC component adjusted analog signal;

[0109] Step S120: Obtain the DC component adjusted analog signal through the active balun unit, and perform single-ended to differential processing on the DC component adjusted analog signal to form a differential analog signal;

[0110] Step S130: Obtain the differential analog signal through the operational amplifier unit, and perform signal amplification processing on the differential analog signal to form a target analog signal;

[0111] Step S140: Collect the voltage of the DC signal in the DC component adjusted analog signal through the voltage acquisition unit, and output the corresponding DC signal acquisition voltage;

[0112] Step S150: Obtain the DC signal acquisition voltage through the differential conversion control unit, and output the corresponding differential conversion control voltage based on the DC signal acquisition voltage;

[0113] Step S160: Obtain the differential conversion control voltage through the voltage feedback unit, and provide a differential conversion bias voltage to the active balun unit based on the differential conversion control voltage.

[0114] Among them, the differential conversion bias voltage is used as the basis for the active balun unit to perform single-ended to differential processing. The specific implementation process of the above steps can refer to the relevant descriptions in the previous text.

[0115] It can be understood that in an alternative embodiment, to ensure the safety of power supply, the signal conditioning circuit based on an active balun further includes a power-on sequence control unit, and the signal conditioning method based on an active balun may further include the following steps:

[0116] Control the power-on sequence of the positive power supply terminal of the active balun unit to be later than the power-on sequence of the negative power supply terminal of the active balun unit through the power-on sequence control unit.

[0117] In summary, the signal conditioning circuit, method, and signal processing device based on an active balun provided by the present application perform DC component adjustment processing on an analog signal to be processed to form a DC component adjusted analog signal; perform single-ended to differential conversion processing on the DC component adjusted analog signal to form a differential analog signal; perform signal amplification processing on the differential analog signal to form a target analog signal; collect the voltage of the DC signal in the DC component adjusted analog signal and output the corresponding DC signal acquisition voltage; output a corresponding differential conversion control voltage based on the DC signal acquisition voltage; and provide a differential conversion bias voltage to the active balun unit based on the differential conversion control voltage. Based on the above, since the differential conversion bias voltage is used as the basis for single-ended to differential conversion processing, the reliability of the single-ended to differential conversion processing is higher, thereby ensuring the reliability of the output differential analog signal to achieve reliable conditioning of the analog signal and improving the problem in the prior art that it is difficult to reliably process analog signals.

[0118] The foregoing is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A signal conditioning circuit based on an active balun, characterized in that: include: A coupling transformation unit, wherein the coupling transformation unit is used to receive an analog signal to be processed through an input terminal, perform a DC component adjustment process on the analog signal to be processed to form a DC component adjusted analog signal, and output the DC component adjusted analog signal through an output terminal; An active balun unit, wherein the input end of the active balun unit is connected to the output end of the coupling transformation unit, and the active balun unit is used to obtain the DC component adjustment analog signal, and perform single-ended conversion processing on the DC component adjustment analog signal to form a differential analog signal, and output the differential analog signal through the output end; An operational amplifier unit, wherein an input end of the operational amplifier unit is connected to an output end of the active balun unit, and the operational amplifier unit is used to obtain the differential analog signal and perform signal amplification processing on the differential analog signal to form a target analog signal; A voltage acquisition unit, wherein the input end of the voltage acquisition unit is connected to the output end of the coupling transformation unit, and the voltage acquisition unit is used to acquire the voltage of the DC signal in the DC component adjustment analog signal, and output the corresponding DC signal acquisition voltage through the output end; A differential conversion control unit, wherein an input end of the differential conversion control unit is connected to an output end of the voltage acquisition unit, and the differential conversion control unit is used to obtain the DC signal acquisition voltage and output a corresponding differential conversion control voltage based on the DC signal acquisition voltage; A voltage feedback unit, wherein the input end of the voltage feedback unit is connected to the output end of the differential conversion control unit, the voltage feedback unit is used to obtain the differential conversion control voltage, and provide a differential conversion bias voltage to the active balun unit based on the differential conversion control voltage, and the differential conversion bias voltage serves as a basis for the active balun unit to perform single-ended to differential processing.

2. The signal conditioning circuit based on active balun according to claim 1, characterized in that: The voltage feedback unit comprises: A driving amplifier, wherein a non-inverting input terminal of the driving amplifier is connected to an output terminal of the differential conversion control unit via a first resistor, and the driving amplifier is used to amplify the differential conversion control voltage output by the differential conversion control unit and output it to a linear controllable power supply via a second resistor; A linear controllable power supply, wherein the input end of the linear controllable power supply is connected to the output end of the driving amplifier through the second resistor, and the linear controllable power supply is used to obtain the amplified differential conversion control voltage and perform voltage stabilization on the amplified differential conversion control voltage to form a differential conversion bias voltage; A Schottky diode, wherein an anode of the Schottky diode is connected to the output end of the linear controllable power supply, and a cathode of the Schottky diode is connected to a DC bias voltage feedback control pin of the active balun unit to provide the differential conversion bias voltage; A first capacitor, wherein a first end of the first capacitor is connected to the cathode of the Schottky diode, and a second end of the first capacitor is grounded; A third resistor, wherein a first end of the third resistor is connected to the non-inverting input end of the driving amplifier, and a second end of the third resistor is connected to the output end of the driving amplifier; A first magnetic bead, wherein a first end of the first magnetic bead is connected to a positive terminal of a power supply of the driving amplifier, and a second end of the first magnetic bead is used as a positive terminal connected to a power supply voltage; A second magnetic bead, wherein a first end of the second magnetic bead is connected to the negative end of the power supply of the driving amplifier, and a second end of the second magnetic bead is used as a negative end connected to the power supply voltage.

3. The signal conditioning circuit based on active balun according to claim 2, characterized in that: The linear controllable power supply comprises: A voltage stabilizing component, wherein an input end of the voltage stabilizing component is connected to the second resistor, an output end of the voltage stabilizing component is connected to an anode of the Schottky diode, a first end of the second resistor is connected to an output end of the driving amplifier, and a second end of the second resistor is connected to an input end of the voltage stabilizing component; A fourth resistor, wherein a first end of the fourth resistor is connected to the input end of the voltage stabilizing component, and a second end of the fourth resistor is connected to the cathode of the Schottky diode; A fifth resistor, wherein a first end of the fifth resistor is connected to the input of the voltage stabilizing component, and a second end of the fifth resistor is grounded.

4. The signal conditioning circuit based on active balun according to claim 3, characterized in that: The voltage stabilizing component comprises: an error amplifier, wherein a positive phase input terminal of the error amplifier is connected to the second end of the second resistor, and a negative phase input terminal of the error amplifier is used as a connection terminal for a reference voltage; a first controller, wherein an input terminal of the first controller is connected to an output terminal of the error amplifier; A first field effect transistor, wherein a gate of the first field effect transistor is connected to an output end of the first controller, a source of the first field effect transistor is grounded, and a drain of the first field effect transistor is connected to an anode of the Schottky diode.

5. The signal conditioning circuit based on active balun according to claim 1, characterized in that: The active balun-based signal conditioning circuit further includes: A power-on timing control unit, wherein the power-on timing control unit is connected to the power supply end of the active balun unit, and the power-on timing control unit is used to control the power-on timing of the positive power supply end of the active balun unit to be later than the power-on timing of the negative power supply end of the active balun unit.

6. The signal conditioning circuit based on active balun according to claim 5, characterized in that: The power-on timing control unit comprises: A second field effect transistor, wherein a source of the second field effect transistor is connected to a positive terminal of an external power supply, and a drain of the second field effect transistor is connected to a positive power supply terminal of the active balun unit; A second capacitor, wherein a first end of the second capacitor is connected to the source of the second field effect transistor, and a second end of the second capacitor is grounded; a sixth resistor, wherein a first end of the sixth resistor is connected to the source of the second field effect transistor, and a second end of the sixth resistor is connected to the gate of the second field effect transistor; A first triode, wherein the collector of the first triode is connected to the collector of the second field effect transistor; a seventh resistor, wherein a first end of the seventh resistor is connected to the base of the first transistor, and a second end of the seventh resistor is grounded; an eighth resistor, wherein a first end of the eighth resistor is connected to the emitter of the first transistor, and a second end of the eighth resistor is grounded; A ninth resistor, wherein a first end of the ninth resistor is connected to the emitter of the first transistor, and a second end of the ninth resistor is connected to the negative power supply end of the active balun unit and the negative end of the external power supply; a third capacitor, wherein a first end of the third capacitor is connected to a first end of the ninth resistor, and a second end of the third capacitor is connected to a second end of the ninth resistor; Among them, after the positive and negative ends of the external power supply are powered respectively, the negative power supply end of the active balun unit is powered on through the negative end of the external power supply, and the first transistor is turned on based on the power supply of the negative end of the external power supply, so that the gate of the second field effect transistor is the negative voltage provided by the negative end of the external power supply, so that after the positive voltage provided by the positive end of the external power supply is applied to the source of the second field effect transistor, the second field effect transistor is turned on, so that the positive voltage provided by the positive end of the external power supply is applied to the positive power supply end of the active balun unit, thereby controlling the power-on timing of the positive power supply end of the active balun unit to be later than the power-on timing of the negative power supply end of the active balun unit.

7. The signal conditioning circuit based on active balun according to claim 1, characterized in that: The voltage acquisition unit comprises: An operational amplifier, wherein a positive phase input terminal of the operational amplifier is connected to an output terminal of the coupling conversion unit through a tenth resistor to obtain a voltage of a DC signal in the DC component adjustment analog signal, and a negative phase input terminal of the operational amplifier is grounded through an eleventh resistor and connected to an output terminal of the operational amplifier through a twelfth resistor to form a feedback loop; a thirteenth resistor, wherein a first end of the thirteenth resistor is connected to the output end of the operational amplifier, and a second end of the thirteenth resistor serves as the output end of the voltage acquisition unit, so that a DC signal acquisition voltage formed by the operational amplifier amplifying the DC signal of the DC component adjustment analog signal is output through the output end; A third magnetic bead, wherein a first end of the third magnetic bead is connected to the positive power supply terminal of the operational amplifier, and a second end of the third magnetic bead serves as a positive terminal connected to the power supply voltage; A fourth magnetic bead, wherein a first end of the fourth magnetic bead is connected to the negative power supply terminal of the operational amplifier, and a second end of the fourth magnetic bead is used as a negative terminal connected to the power supply voltage.

8. A signal conditioning method based on active balun, characterized in that: The signal conditioning circuit based on active balun as described in any one of claims 1 to 7, wherein the signal conditioning method based on active balun comprises: Receiving the analog signal to be processed through the coupling transformation unit, and performing a DC component adjustment process on the analog signal to be processed to form a DC component adjusted analog signal; The DC component adjustment analog signal is obtained through the active balun unit, and the DC component adjustment analog signal is converted from a single-ended to a differential to form a differential analog signal; Acquiring the differential analog signal through the operational amplifier unit, and performing signal amplification processing on the differential analog signal to form a target analog signal; The voltage acquisition unit acquires the voltage of the DC signal in the DC component adjustment analog signal, and outputs a corresponding DC signal acquisition voltage; The DC signal acquisition voltage is acquired by the differential conversion control unit, and a corresponding differential conversion control voltage is output based on the DC signal acquisition voltage; The differential conversion control voltage is obtained through the voltage feedback unit, and a differential conversion bias voltage is provided to the active balun unit based on the differential conversion control voltage, wherein the differential conversion bias voltage serves as a basis for the active balun unit to perform single-ended to differential processing.

9. The signal conditioning method based on active balun according to claim 8, characterized in that: The active balun-based signal conditioning circuit further includes a power-on timing control unit, and the active balun-based signal conditioning method further includes: The power-on timing control unit controls the power-on timing of the positive power supply terminal of the active balun unit to be later than the power-on timing of the negative power supply terminal of the active balun unit.

10. A signal processing device, characterized in that: include: The signal conditioning circuit based on active balun according to any one of claims 1 to 7; An analog-to-digital conversion circuit, wherein the input end of the analog-to-digital conversion circuit is connected to the output end of the signal conditioning circuit based on the active balun, and the analog-to-digital conversion circuit is used to perform analog-to-digital conversion processing on a target analog signal output by the signal conditioning circuit based on the active balun to form a target digital signal.

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