Single-ended to differential output circuits and communication equipment

Abstract

This application provides a single-ended to differential output circuit and a communication device. The output circuit includes at least one conversion circuit, each conversion circuit including: a first filtering module for receiving a target signal and outputting a DC component or an AC component of the target signal; a second filtering module for receiving the target signal and outputting an AC component or a DC component of the target signal; the first filtering module and the second filtering module output signals of different types; an inverting amplifier module for receiving the DC component and the AC component and outputting a first differential signal to the radio frequency circuit; and a non-inverting follower module for receiving the DC component and the AC component and outputting a second differential signal to the radio frequency circuit; the second differential signal and the first differential signal have the same amplitude and a phase difference of 180°.

Description

Technical Field

[0001] This application relates to the field of radio frequency communication technology, and in particular to a single-ended to differential output circuit and communication device. Background Technology

[0002] In high-speed communication circuits, single-ended links are frequently used in data centers and other applications due to their advantages such as high density, small size, and doubled data processing capacity. However, their poor linearity and low signal-to-noise ratio limit their application. Signal processing often requires converting single-ended input signals into differential output signals; therefore, single-ended to differential circuits have become crucial components in communication systems.

[0003] However, common single-ended to differential circuits have a large difference in frequency response between the two outputs, which can lead to severe signal distortion and cause the amplitude and phase imbalances of the two output signals to gradually worsen. Utility Model Content

[0004] This application provides a single-ended to differential output circuit and a communication device that can process an input target signal to extract the DC component and AC component of the target signal respectively, and then process the DC component and AC component to output a first differential signal and a second differential signal with equal amplitude and a phase difference of 180°.

[0005] To address the aforementioned technical problems, this application provides a single-ended to differential output circuit. The single-ended to differential output circuit includes at least one conversion circuit, each configured to receive a target signal and differentially convert the target signal to output to an RF circuit. Each conversion circuit includes a first filtering module, a second filtering module, an inverting amplifier module, and a non-inverting follower module. The first filtering module receives the target signal and outputs either the DC or AC component of the target signal. The second filtering module receives the target signal and outputs either the AC or DC component of the target signal. The first and second filtering modules output signals of different types. The inverting amplifier module is coupled to the outputs of both the first and second filtering modules, and receives both the DC and AC components, outputting a first differential signal to the RF circuit. The non-inverting follower module is coupled to the outputs of both the second and first filtering modules, and receives both the DC and AC components, outputting a second differential signal to the RF circuit. The second differential signal has the same amplitude as the first differential signal, and the phase difference between the second and first differential signals is 180°.

[0006] In order to solve the above-mentioned technical problems, this application provides a communication device, which includes the above-mentioned single-ended to differential output circuit.

[0007] The single-ended to differential output circuit and communication device provided in this application embodiment include at least one conversion circuit. Each conversion circuit is configured to receive a target signal and differentially convert the target signal to output to an RF circuit. Each conversion circuit includes a first filtering module, a second filtering module, an inverting amplifier module, and a non-inverting follower module. Each conversion circuit can use the first filtering module to process the input target signal to extract the DC or AC component of the target signal, use the second filtering module to process the input target signal to extract the AC or DC component of the target signal, and then use the inverting amplifier module and the non-inverting follower module to process the DC and AC components to output a first differential signal and a second differential signal with equal amplitude and a phase difference of 180°. The circuit structure is simple and can achieve standard differential output. Attached Figure Description

[0008] 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 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. Wherein:

[0009] Figure 1 This is a schematic diagram of the single-ended to differential output circuit in some embodiments of this application;

[0010] Figure 2 This is a schematic diagram of the single-ended to differential output circuit in some embodiments of this application;

[0011] Figure 3 This is a schematic diagram of the single-ended to differential output circuit and the radio frequency circuit in some embodiments of this application;

[0012] Figure 4 This is a schematic diagram of the single-ended to differential output circuit and the radio frequency circuit in some embodiments of this application;

[0013] Figure 5 These are schematic diagrams of the conversion circuit and radio frequency circuit in some embodiments of this application;

[0014] Figure 6 This is a schematic diagram of the structure of the first filtering module in some embodiments of this application;

[0015] Figure 7 This is a circuit schematic diagram of the first filtering module in some embodiments of this application;

[0016] Figure 8 This is a schematic diagram of the structure of the second filtering module in some embodiments of this application;

[0017] Figure 9 This is a circuit schematic diagram of the second filter unit in some embodiments of this application;

[0018] Figure 10 This is a circuit schematic diagram of the third filter unit in some embodiments of this application;

[0019] Figure 11 This is a circuit schematic diagram of the second filtering module in some embodiments of this application;

[0020] Figure 12 This is a schematic diagram of the structure of the second filtering module in some embodiments of this application;

[0021] Figure 13 This is a circuit schematic diagram of the second filter unit in some embodiments of this application;

[0022] Figure 14 This is a circuit schematic diagram of the third filter unit in some embodiments of this application;

[0023] Figure 15 This is a circuit schematic diagram of the second filtering module in some embodiments of this application;

[0024] Figure 16 This is a circuit schematic diagram of the inverting amplifier module in some embodiments of this application;

[0025] Figure 17 This is a circuit schematic diagram of the in-phase follower module in some embodiments of this application;

[0026] Figure 18 This is a circuit schematic diagram of a single-ended to differential output circuit in some embodiments of this application;

[0027] Figure 19 This is a circuit schematic diagram of a single-ended to differential output circuit in some embodiments of this application;

[0028] Figure 20 These are schematic diagrams of the communication device in some embodiments of this application;

[0029] Figure 21 These are schematic diagrams of the communication device in some embodiments of this application. Detailed Implementation

[0030] The technical solutions of 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 the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0031] According to some embodiments provided in this application, such as Figures 1 to 4 As shown, Figure 1 and Figure 2 These are schematic diagrams of single-ended to differential output circuits in some embodiments of this application. Figure 3 and Figure 4 These are schematic diagrams of the single-ended to differential output circuit and the radio frequency circuit in some embodiments of this application.

[0032] This application provides a single-ended to differential output circuit 10 in some embodiments, which includes at least one conversion circuit 100. The conversion circuit 100 converts a single-ended signal into a differential signal. The signal input of the single-ended signal consists of a signal line and a ground line, and the single-ended signal transmits the signal using only one signal line. The differential signal consists of two signal lines, both of which are used to transmit the signal, and the differential signals transmitted by the two signal lines have equal amplitudes and opposite phases.

[0033] The single-ended to differential output circuit 10 includes one conversion circuit 100, such as... Figure 1 As shown; the single-ended to differential output circuit 10 includes two conversion circuits 100, such as... Figure 2 As shown; the single-ended to differential output circuit 10 may include other conversion circuits 100, such as 3, 4, etc., which are not limited here.

[0034] Each conversion circuit 100 is used to receive a target signal (corresponding to the single-ended signal mentioned above). The number of conversion circuits 100 corresponds one-to-one with the number of target signals. The number of conversion circuits 100 can be determined according to the number of signals input to the single-ended to differential output circuit 10.

[0035] When multiple conversion circuits 100 exist, the target signals received by different conversion circuits 100 may be the same or different. The differences in target signals are reflected in aspects such as signal type, signal amplitude, and signal phase. For example, when a single-ended to differential output circuit 10 includes one conversion circuit 100, the target signal received by this conversion circuit 100 is the in-phase component, quadrature component, or other components in an in-phase or quadrature signal. When a single-ended to differential output circuit 10 includes two conversion circuits 100, the target signals received by these two conversion circuits 100 are respectively the in-phase component and the quadrature component in an in-phase or quadrature signal, or other components.

[0036] The single-ended to differential output circuit 10 provided in this application is connected to the radio frequency (RF) circuit 20. Specifically, the output terminal of the conversion circuit 100 within the single-ended to differential output circuit 10 is connected to the input terminal of the RF circuit 20. The single-ended to differential output circuit 10 is part of the RF front-end circuit. Each conversion circuit 100 is configured to receive a target signal and differentially convert the target signal to output it to the RF circuit 20. The target signal includes both AC and DC components.

[0037] like Figure 1 The single-ended to differential output circuit 10 shown includes a conversion circuit 100 whose output terminal is connected to the input terminal of the radio frequency circuit 20. See [link to relevant documentation] for details. Figure 3 The conversion circuit 100 is configured to receive a target signal and differentially convert the target signal and output it to the radio frequency circuit 20.

[0038] like Figure 2 The single-ended to differential output circuit 10 shown includes two conversion circuits 100 whose output terminals are respectively connected to the input terminals of the radio frequency circuit 20. See [link to relevant documentation] for details. Figure 4 These two conversion circuits 100 each receive a target signal and differentially convert the corresponding target signals, outputting them to the radio frequency circuit 20. The target signals received by the two conversion circuits 100 may be the same or different.

[0039] It is understood that when the single-ended to differential output circuit 10 includes three or more conversion circuits 100, the output terminals of the multiple conversion circuits 100 are respectively connected to the input terminals of the radio frequency circuit 20. The target signals received by the multiple conversion circuits 100 may be the same or different, and the signals input to the radio frequency circuit 20 may be the same or different.

[0040] It is understandable that the target signal received by each conversion circuit 100 can be determined according to the required function.

[0041] Taking a single-ended to differential output circuit 10, which includes two conversion circuits 100, as an example, where one conversion circuit 100 receives the in-phase component (represented by the "I signal") of an in-phase quadrature signal, and the other conversion circuit 100 receives the quadrature component (represented by the "Q signal") of an in-phase quadrature signal, the phase difference between the I and Q signals is 90°. In communication equipment, the I and Q signals, as the core of quadrature modulation technology, are widely used in wireless communication, radio, and high-precision digital modulation and demodulation. I / Q signals achieve efficient spectrum utilization and anti-interference capabilities by independently controlling their amplitude and phase. However, the high-frequency characteristics of radio frequency signals place stringent requirements on the circuit's noise immunity, common-mode rejection, and amplitude-phase consistency. In radio frequency front-end circuits, I / Q single-ended signals are susceptible to power supply noise, crosstalk, and environmental interference, while I / Q differential signals, through symmetrical transmission, can significantly suppress common-mode noise and improve the signal-to-noise ratio. Therefore, high-performance single-ended to differential circuits become key modules in the radio frequency link, directly affecting the system's bit error rate and modulation accuracy.

[0042] In related solutions, integrated chips are used to convert I / Q signals from single-ended to differential. However, bandwidth and transmission rate are limited by the chip, which cannot meet the requirements of high-performance RF solutions, and the cost is high. In addition, when common single-ended to differential circuits process signals with both AC and DC components, the differential output has an amplitude imbalance, resulting in constellation diagram distortion and severe DC leakage.

[0043] Based on this, the single-ended to differential output circuit 10 provided in this application is not only suitable for the front end of the RF circuit 20, but also ensures standard differential output under I / Q single-ended signal inputs of different amplitudes, that is, the DC component amplitude of the output differential signal is equal and the AC component phase difference is 180°. At the same time, the single-ended to differential output circuit 10 achieves high-fidelity I / Q signal conversion without external calibration, thereby improving the overall performance of the communication equipment.

[0044] According to some embodiments provided in this application, such as Figure 5 As shown, Figure 5 This is a schematic diagram of the conversion circuit and the radio frequency circuit in some embodiments of this application. The conversion circuit 100 includes a first filter module 101, a second filter module 102, an inverting amplifier module 103, and a non-inverting follower module 104.

[0045] The first filtering module 101 is used to receive the target signal and output the DC component or AC component of the target signal.

[0046] The second filtering module 102 is used to receive the target signal and output the AC or DC component of the target signal. The first filtering module 101 and the second filtering module 102 output different signal types. When the first filtering module 101 outputs a DC component, the second filtering module 102 outputs an AC component, and vice versa.

[0047] The first input terminal of the inverting amplifier module 103 is coupled to the output terminal of the first filter module 101, and the second input terminal of the inverting amplifier module 103 is coupled to the output terminal of the second filter module 102. The inverting amplifier module 103 is used to receive DC components and AC components and output the first differential signal to the radio frequency circuit 20.

[0048] The first input terminal of the in-phase follower module 104 is coupled to the output terminals of the second filter module 102 and the first filter module 101. The second input terminal of the in-phase follower module 104 is coupled to the output terminal of the in-phase follower module 104. The in-phase follower module 104 is used to receive the DC component and the AC component and output the second differential signal to the radio frequency circuit 20.

[0049] The second differential signal has the same amplitude as the first differential signal, and the phase difference between the second differential signal and the first differential signal is 180°.

[0050] In some embodiments of this application, the DC and AC components in the target signal are extracted using the first filtering module 101 and the second filtering module 102, respectively, facilitating subsequent separate processing of the DC and AC components. The DC and AC components are superimposed and input into the inverting amplifier module 103, which can then be used to obtain a first differential signal based on the DC and AC components. Furthermore, the DC and AC components are superimposed and input into the in-phase follower module 104, which can then be used to obtain a second differential signal with the same amplitude as the first differential signal but a phase difference of 180°. This achieves the conversion from a single-ended signal (target signal) to a differential signal output as both a first and a second differential signal after differential conversion, ensuring that the first and second differential signals have the same amplitude and a 180° phase difference under different biases and amplitudes.

[0051] According to some embodiments provided in this application, such as Figure 6 As shown, Figure 6 This is a schematic diagram of the structure of the first filtering module in some embodiments of this application.

[0052] like Figure 6As shown, the first filtering module 101 includes a first filtering unit 1011 and a first amplification unit 1012. The first filtering unit 1011 is used to receive the target signal, and the first amplification unit 1012 is coupled to the output terminal of the first filtering unit 1011 and is used to output the DC component or AC component in the target signal.

[0053] In some embodiments, the first filtering unit 1011 includes a first-order filter, a second-order filter, or other order filters, which are not limited here.

[0054] In some embodiments, the first filtering unit 1011 includes a passive filter or an active filter, which is not limited here.

[0055] In some embodiments, the first filtering unit 1011 includes a low-pass filter, a high-pass filter, or others, which are not limited here.

[0056] In some embodiments, the first filtering unit 1011 includes at least one RC filter circuit. When the first filtering unit 1011 includes multiple RC filter circuits, the multiple RC filter circuits are connected in series. Each RC filter circuit includes at least one resistor and at least one capacitor.

[0057] In some embodiments, the RC filter circuit can be a low-pass filter, a high-pass filter, or others. The RC filter circuit can be used to obtain both the DC component and the AC component of the target signal.

[0058] When the RC filter circuit outputs the DC component, the first filter module 101 can extract the DC component from the target signal separately, independently of the AC component. This avoids mutual interference between the extraction of the DC and AC components, which could then interfere with the subsequently extracted differential signal.

[0059] When the RC filter circuit outputs the AC component, the first filter module 101 can extract the AC component in the target signal separately, independently of the DC component in the target signal. This avoids mutual interference between the extraction of the DC component and the AC component, which would then interfere with the subsequently extracted differential signal.

[0060] In some embodiments, the number of RC filter circuits in the first filter unit 1011 can be one, two, or other numbers, which can be determined according to the actual situation and is not limited here.

[0061] For example, when the RC filter circuit is a first-order high-pass filter, and the RC filter circuit includes a resistor and a capacitor, the first end of the resistor is coupled to the first plate of the capacitor, the second end of the resistor is grounded, the second plate of the capacitor is used to receive the target signal, the first plate of the capacitor and the first end of the resistor serve as the output terminal of the RC filter circuit, and the first amplification unit 1012 outputs the AC component in the target signal.

[0062] For example, when the RC filter circuit is a first-order low-pass filter, and the RC filter circuit includes a resistor and a capacitor, the first plate of the capacitor is coupled to the first end of the resistor, the second plate of the capacitor is grounded, the second end of the resistor is used to receive the target signal, the first end of the resistor and the first plate of the capacitor serve as the output terminal of the RC filter circuit, and the first amplification unit 1012 outputs the DC component in the target signal.

[0063] For example, when the RC filter circuit is a second-order high-pass filter, and the RC filter circuit includes two resistors and two capacitors, specifically a seventh resistor, an eighth resistor, a third capacitor, and a fourth capacitor, the first end of the seventh resistor is coupled to the first plate of the third capacitor, the second end of the seventh resistor is grounded, the second plate of the third capacitor is used to receive the target signal, the first plate of the fourth capacitor is coupled to the first plate of the third capacitor and the first end of the seventh resistor, the second plate of the fourth capacitor is coupled to the first end of the eighth resistor, the second end of the eighth resistor is grounded, the second plate of the fourth capacitor and the first end of the eighth resistor serve as the output terminal of the RC filter circuit, and the first amplification unit 1012 outputs the AC component in the target signal.

[0064] For example, when the RC filter circuit is a second-order low-pass filter, and the RC filter circuit includes two resistors and two capacitors, specifically a seventh resistor, an eighth resistor, a third capacitor, and a fourth capacitor, the first plate of the third capacitor is coupled to the first end of the seventh resistor, the second plate of the third capacitor is grounded, the second end of the seventh resistor is used to receive the target signal, the first end of the eighth resistor is coupled to the first end of the seventh resistor and the first plate of the third capacitor, the second end of the eighth resistor is coupled to the first plate of the fourth capacitor, the second plate of the fourth capacitor is grounded, the second end of the eighth resistor and the first end of the fourth capacitor serve as the output end of the RC filter circuit, and the first amplification unit 1012 outputs the DC component in the target signal.

[0065] In some embodiments, the first filtering unit 1011 includes at least one LC filter circuit. When the first filtering unit 1011 includes multiple LC filter circuits, the multiple LC filter circuits are connected in series. Each LC filter circuit includes at least one inductor and at least one capacitor.

[0066] In some embodiments, the LC filter circuit can be a low-pass filter, a high-pass filter, or others. The RC filter circuit can be used to obtain both the DC component and the AC component of the target signal.

[0067] When the LC filter circuit outputs a DC component, the first filter module 101 can extract the DC component from the target signal separately, independently of the AC component in the target signal. This avoids mutual interference between the extraction of the DC component and the AC component, which would then interfere with the subsequently extracted differential signal.

[0068] When the LC filter circuit outputs the AC component, the first filter module 101 can extract the AC component in the target signal separately, independently of the DC component in the target signal. This avoids mutual interference between the extraction of the DC component and the AC component, which would then interfere with the subsequently extracted differential signal.

[0069] In some embodiments, the number of LC filter circuits in the first filter unit 1011 can be one, two, or other numbers, which can be determined according to the actual situation and is not limited here.

[0070] For example, when the LC filter circuit is a first-order high-pass filter, and the LC filter circuit includes an inductor and a capacitor, the first end of the inductor is coupled to the first plate of the capacitor, the second end of the inductor is grounded, the second plate of the capacitor is used to receive the target signal, and the first plate of the capacitor and the first end of the inductor serve as the output terminal of the LC filter circuit, and the first amplification unit 1012 outputs the AC component in the target signal.

[0071] For example, when the LC filter circuit is a first-order low-pass filter, and the LC filter circuit includes an inductor and a capacitor, the first plate of the capacitor is coupled to the first end of the inductor, the second plate of the capacitor is grounded, the second end of the inductor is used to receive the target signal, and the first end of the inductor and the first plate of the capacitor serve as the output terminals of the LC filter circuit, and the first amplification unit 1012 outputs the DC component in the target signal.

[0072] For example, when the LC filter circuit is a second-order high-pass filter, and the LC filter circuit includes two inductors and two capacitors, specifically a first inductor, a second inductor, a third capacitor, and a fourth capacitor, the first end of the first inductor is coupled to the first plate of the third capacitor, the second end of the first inductor is grounded, the second plate of the third capacitor is used to receive the target signal, the first plate of the fourth capacitor is coupled to the first plate of the third capacitor and the first end of the first inductor, the second plate of the fourth capacitor is coupled to the first end of the second inductor, the second end of the second inductor is grounded, the second plate of the fourth capacitor and the first end of the second inductor serve as the output terminals of the LC filter circuit, and the first amplification unit 1012 outputs the AC component in the target signal.

[0073] For example, when the LC filter circuit is a second-order low-pass filter, and the LC filter circuit includes two inductors and two capacitors, specifically a first inductor, a second inductor, a third capacitor, and a fourth capacitor, the first plate of the third capacitor is coupled to the first end of the first inductor, the second plate of the third capacitor is grounded, the second end of the first inductor is used to receive the target signal, the first end of the second inductor is coupled to the first end of the first inductor and the first plate of the third capacitor, the second end of the second inductor is coupled to the first plate of the fourth capacitor, the second plate of the fourth capacitor is grounded, the second end of the second inductor and the first end of the fourth capacitor serve as the output terminals of the RC filter circuit, and the first amplification unit 1012 outputs the DC component of the target signal.

[0074] In other embodiments, the first filtering unit 1011 includes at least one RC filter circuit and at least one LC filter circuit, with the RC filter circuit and the LC filter circuit connected in series. For details, please refer to the above content, which will not be repeated here.

[0075] When both the RC filter structure and the LC filter structure are low-pass filters, the first amplification unit 1012 outputs the DC component of the target signal.

[0076] When both the RC and LC filter structures are high-pass filters, the first amplification unit outputs the AC component of the target signal. In some embodiments, the first amplification unit 1012 includes a first amplifier, the non-inverting input of the first amplifier is coupled to the output of the first filter unit 1011, the inverting input of the first amplifier is grounded through a first resistor, and the inverting input of the first amplifier is coupled to the output of the first amplifier through a second resistor. The output of the first amplifier is used to output either a DC component or an AC component.

[0077] For example, when the RC filter circuit is a first-order high-pass filter, and the RC filter circuit includes a seventh resistor and a third capacitor, the non-inverting input terminal of the first amplifier is coupled to the first terminal of the seventh resistor and the first plate of the third capacitor, the second terminal of the seventh resistor is grounded, the second plate of the third capacitor is used to receive the target signal, the inverting input terminal of the first amplifier is grounded through the first resistor, and the inverting input terminal of the first amplifier is coupled to the output terminal of the first amplifier through the second resistor, and the output terminal of the first amplifier is used to output the AC component in the target signal.

[0078] For example, when the RC filter circuit is a first-order low-pass filter, and the RC filter circuit includes a seventh resistor and a third capacitor, the non-inverting input terminal of the first amplifier is coupled to the first terminal of the seventh resistor and the first plate of the third capacitor, the second plate of the third capacitor is grounded, the second terminal of the seventh resistor is used to receive the target signal, the inverting input terminal of the first amplifier is grounded through the first resistor, and the inverting input terminal of the first amplifier is coupled to the output terminal of the first amplifier through the second resistor, and the output terminal of the first amplifier is used to output the DC component in the target signal.

[0079] For example, when the RC filter circuit is a second-order high-pass filter, and the RC filter circuit includes two resistors and two capacitors, specifically a seventh resistor, an eighth resistor, a third capacitor, and a fourth capacitor, the non-inverting input terminal of the first amplifier is coupled to the second plate of the fourth capacitor and the first terminal of the eighth resistor, the second terminal of the eighth resistor is grounded, the first plate of the fourth capacitor is coupled to the first plate of the third capacitor and the first terminal of the seventh resistor, the second terminal of the seventh resistor is grounded, the second plate of the third capacitor is used to receive the target signal, the inverting input terminal of the first amplifier is grounded through the first resistor, and the inverting input terminal of the first amplifier is coupled to the output terminal of the first amplifier through the second resistor, the output terminal of the first amplifier is used to output the AC component in the target signal.

[0080] For example, when the RC filter circuit is a second-order low-pass filter, and the RC filter circuit includes two resistors and two capacitors, specifically a seventh resistor, an eighth resistor, a third capacitor, and a fourth capacitor, the non-inverting input terminal of the first amplifier is coupled to the second terminal of the eighth resistor and the first plate of the fourth capacitor, the second plate of the fourth capacitor is grounded, the first terminal of the eighth resistor is coupled to the first terminal of the seventh resistor and the first plate of the third capacitor, the second plate of the third capacitor is grounded, the second terminal of the seventh resistor is used to receive the target signal, the inverting input terminal of the first amplifier is grounded through the first resistor, and the inverting input terminal of the first amplifier is coupled to the output terminal of the first amplifier through the second resistor, the output terminal of the first amplifier is used to output the DC component in the target signal.

[0081] It is worth noting that the values ​​of the resistors and capacitors included in the RC filter circuit of the first filter unit 1011 can be dynamically determined according to the frequency of the AC component in the target signal. When the frequency of the AC component in the target signal changes, new resistors and capacitors can be dynamically replaced with resistors and / or capacitors of other values.

[0082] It is worth noting that the values ​​of the inductor and capacitor included in the LC filter circuit of the first filter unit 1011 can be dynamically determined according to the frequency of the AC component in the target signal. When the frequency of the AC component in the target signal changes, new inductors and capacitors can be dynamically replaced to replace them with inductors and / or capacitors with other values.

[0083] In some embodiments, as the frequency of the AC component increases, the values ​​of the resistors and capacitors in the RC filter circuit will decrease accordingly, and the values ​​of the inductors and capacitors in the LC filter circuit will also decrease accordingly.

[0084] It is worth noting that the values ​​of the first resistor and the second resistor in the first amplification unit 1012 can be dynamically adjusted according to the amplitude of the required DC component output.

[0085] According to some embodiments provided in this application, such as Figure 7 As shown, Figure 7 This is a circuit schematic diagram of the first filtering module in some embodiments of this application.

[0086] like Figure 7 As shown, the first filter module 101 includes two RC filter circuits 201, a first amplifier 202, and a first resistor ( Figure 7 (represented by "R1") and the second resistor ( Figure 7 (Used as "R2" in Chinese).

[0087] Among them, the two RC filter circuits 201 are first-order low-pass filters, and the two RC filter circuits 201 form a second-order low-pass filter, including the seventh resistor ( Figure 7 (Represented by "R7"), the eighth resistor ( Figure 7 (Represented by "R8"), the third capacitor ( Figure 7 (indicated by "C3") and the fourth capacitor ( Figure 7 (C4 is used as a symbol in the diagram). The first plate of the third capacitor is coupled to the first terminal of the seventh resistor. The second plate of the third capacitor is grounded. The second terminal of the seventh resistor is used to receive the target signal. The first terminal of the eighth resistor is coupled to the first terminal of the seventh resistor and the first plate of the third capacitor. The second terminal of the eighth resistor is coupled to the first plate of the fourth capacitor. The second plate of the fourth capacitor is grounded.

[0088] The non-inverting input terminal of the first amplifier 202 ( Figure 7 (Used as a "+") is used to couple the second terminal of the eighth resistor and the first plate of the fourth capacitor, the inverting input terminal of the first amplifier 202 ( Figure 7 (Used as a "-") is grounded through the first resistor, and the inverting input terminal of the first amplifier 202 is coupled to the output terminal of the first amplifier 202 through the second resistor. The output terminal of the first amplifier 202 is used to output the DC component.

[0089] The first filtering module 101 provided in some embodiments of this application can extract the DC component in the target signal separately, independently of the AC component in the target signal. This can avoid mutual interference between the extraction of the DC component and the AC component, which would then interfere with the subsequently extracted differential signal.

[0090] According to some embodiments provided in this application, such as Figures 8 to 10 As shown, Figure 8 This is a schematic diagram of the structure of the second filtering module in some embodiments of this application. Figure 9 This is a circuit schematic diagram of the second filter unit in some embodiments of this application. Figure 10 This is a circuit schematic diagram of the third filter unit in some embodiments of this application.

[0091] like Figure 8 As shown, the second filtering module 102 includes a second filtering unit 1021 and a third filtering unit 1022.

[0092] When the first filter module 101 outputs the DC component, the second filter unit 1021 and the third filter unit 1022 are used to receive the target signal and extract the AC component in the target signal.

[0093] Specifically, the second filtering unit 1021 is used to receive the target signal and output the first AC component to the inverting amplifier module 103. The inverting amplifier module 103 receives the DC component and the first AC component and outputs the first differential signal to the radio frequency circuit 20.

[0094] The third filtering unit 1022 is used to receive the target signal and output the second AC component to the in-phase follower module 104. The in-phase follower module 104 receives the DC component and the second AC component and outputs the second differential signal to the radio frequency circuit 20.

[0095] The first AC component may be the same as or different from the second AC component, depending on the circuit structure of the second filter unit 1021 and the third filter unit 1022.

[0096] In some embodiments, such as Figure 9 As shown, the second filter unit 1021 includes a first capacitor ( Figure 9 (represented by "C1") and the third resistor ( Figure 9 (Represented by "R3" in the diagram). The first plate of the first capacitor receives the target signal. The first terminal of the third resistor is coupled to the second plate of the first capacitor, and the second terminal of the third resistor outputs the first AC component. The second terminal of the third resistor is coupled to the second input terminal of the inverting amplifier module 103 to transmit the first AC component to the inverting amplifier module 103. The third resistor protects against the superposition of the first AC and DC components into the inverting amplifier module 103.

[0097] In some embodiments, such as Figure 10 As shown, the third filter unit 1022 includes a second capacitor ( Figure 10 (represented by "C2") and the fourth resistor ( Figure 10(Illustrated by "R4" in the diagram). The first plate of the second capacitor receives the target signal. The first terminal of the fourth resistor is coupled to the second plate of the second capacitor, and the second terminal of the fourth resistor outputs the second AC component. The second terminal of the fourth resistor is coupled to the first input terminal of the in-phase follower module 104 to transmit the second AC component to the in-phase follower module 104. The fourth resistor protects against the superposition of the second AC component and the DC component into the in-phase follower module 104.

[0098] In some embodiments, the first capacitor is a DC blocking capacitor; the second capacitor is a DC blocking capacitor.

[0099] According to some embodiments of this application, such as Figure 11 As shown, Figure 11 This is a circuit schematic diagram of the second filtering module in some embodiments of this application.

[0100] like Figure 11 As shown, the second filter module 102 includes a first capacitor ( Figure 11 (C1 is used as an indicator in the text), the second capacitor ( Figure 11 (C2 is used as a symbol in the text), the third resistor ( Figure 11 (represented by "R3") and the fourth resistor ( Figure 11 (Used as "R4" in Chinese).

[0101] The connection method and function of the first capacitor, the second capacitor, the third resistor, and the fourth resistor can be found in [reference needed]. Figure 13 and Figure 14 This will not be elaborated upon here.

[0102] The second filtering module 102 provided in some embodiments of this application can extract the AC component in the target signal separately, independently of the DC component in the target signal. This can avoid mutual interference between the extraction of DC and AC components, which would then interfere with the subsequently extracted differential signal.

[0103] According to some embodiments provided in this application, such as Figures 12 to 14 As shown, Figure 12 This is a schematic diagram of the structure of the second filtering module in some embodiments of this application. Figure 13 This is a circuit schematic diagram of the second filter unit in some embodiments of this application. Figure 14 This is a circuit schematic diagram of the third filter unit in some embodiments of this application.

[0104] like Figure 12 As shown, the second filtering module 102 includes a second filtering unit 1021 and a third filtering unit 1022.

[0105] When the first filtering module 101 outputs the AC component, the second filtering unit 1021 and the third filtering unit 1022 are used to receive the target signal and extract the DC component from the target signal.

[0106] Specifically, the second filtering unit 1021 is used to receive the target signal and output the first DC component to the inverting amplifier module 103. The inverting amplifier module 103 receives the first DC component and the AC component and outputs the first differential signal to the radio frequency circuit 20.

[0107] The third filtering unit 1022 is used to receive the target signal and output the second DC component to the in-phase follower module 104. The in-phase follower module 104 receives the second DC component and the AC component and outputs the second differential signal to the radio frequency circuit 20.

[0108] The first DC component may be the same as or different from the second DC component, depending on the circuit structure of the second filter unit 1021 and the third filter unit 1022.

[0109] In some embodiments, the second filtering unit 1021 includes at least one RC filter circuit and / or at least one LC filter circuit.

[0110] Specifically, the second filtering unit 1021 includes at least one RC filter circuit. When the second filtering unit 1021 includes multiple RC filter circuits, the multiple RC filter circuits are connected in series.

[0111] Alternatively, the second filtering unit 1021 may include at least one LC filter circuit. When the second filtering unit 1021 includes multiple LC filter circuits, the multiple LC filter circuits are connected in series.

[0112] Alternatively, the second filtering unit 1021 includes at least one RC filter circuit and at least one LC filter circuit. The RC filter circuit and the LC filter circuit are connected in series.

[0113] In some embodiments, the number of RC filter circuits and the number of LC filter circuits in the second filter unit 1021 can be determined according to actual conditions, and no limitation is imposed here.

[0114] In some embodiments, the RC filter circuit and LC filter circuit in the second filter unit 1021 can be a first-order filter, a second-order filter, or other order filters, which are not limited here.

[0115] In some embodiments, the RC filter circuit and LC filter circuit in the second filter unit 1021 can be passive filters or active filters, and no limitation is made here.

[0116] In some embodiments, the third filtering unit 1022 includes at least one RC filter circuit and / or at least one LC filter circuit.

[0117] Specifically, the third filtering unit 1022 includes at least one RC filter circuit. When the third filtering unit 1022 includes multiple RC filter circuits, the multiple RC filter circuits are connected in series.

[0118] Alternatively, the third filtering unit 1022 may include at least one LC filter circuit. When the third filtering unit 1022 includes multiple LC filter circuits, the multiple LC filter circuits are connected in series.

[0119] Alternatively, the third filtering unit 1022 includes at least one RC filter circuit and at least one LC filter circuit. The RC filter circuit and the LC filter circuit are connected in series.

[0120] In some embodiments, the number of RC filter circuits and the number of LC filter circuits in the third filter unit 1022 can be determined according to the actual situation, and no limitation is imposed here.

[0121] In some embodiments, the RC filter circuit and LC filter circuit in the third filter unit 1022 can be first-order filters, second-order filters or other orders of filters, which are not limited here.

[0122] In some embodiments, the RC filter circuit and LC filter circuit in the third filter unit 1022 can be passive filters or active filters, and no limitation is made here.

[0123] In some embodiments, such as Figure 13 As shown, the second filter unit 1021 includes a nineteenth resistor ( Figure 13 (represented by "R19") and the first capacitor ( Figure 13 (C1 is used as a descriptor in the diagram). The first plate of the first capacitor is grounded. The first terminal of the nineteenth resistor is used to receive the target signal. The second terminal of the nineteenth resistor is coupled to the second plate of the first capacitor and is used to output the first DC component. The second terminal of the nineteenth resistor and the second plate of the first capacitor are coupled to the first input terminal of the inverting amplifier module 103 to input the first DC component to the inverting amplifier module 103.

[0124] In some embodiments, such as Figure 14 As shown, the third filter unit 1022 includes a twentieth resistor ( Figure 14 (represented by "R20") and the second capacitor ( Figure 14 (C2 is used as a symbol in the diagram). The first plate of the second capacitor is grounded, the first end of the twentieth resistor is used to receive the target signal, the second end of the twentieth resistor is coupled to the second plate of the second capacitor, and the second end of the twentieth resistor is used to output the second DC component.

[0125] According to some embodiments of this application, such as Figure 15 As shown, Figure 15 This is a circuit schematic diagram of the second filtering module in some embodiments of this application.

[0126] like Figure 15 As shown, the second filter module 102 includes a nineteenth resistor ( Figure 15 (Represented by "R19"), the twentieth resistor ( Figure 15 (Represented by "R20"), First capacitor ( Figure 15 (indicated by "C1") and the second capacitor ( Figure 15 (C2 is used as a symbol in Chinese).

[0127] The connection method and function of the nineteenth resistor, the twentieth resistor, the first capacitor, and the second capacitor can be found in [reference needed]. Figure 13 and Figure 14 This will not be elaborated upon here.

[0128] According to some embodiments provided in this application, such as Figure 16 As shown, Figure 16 This is a circuit schematic diagram of the inverting amplifier module in some embodiments of this application.

[0129] like Figure 16 As shown, the inverting amplifier module 103 includes a second amplifier 1031 and a fifth resistor ( Figure 16 (Used as "R5" in Chinese).

[0130] When the first filter module 101 outputs a DC component, the non-inverting input terminal of the second amplifier 1031 ( Figure 16 The inverting amplifier module 103 (indicated by "+") is used as the first input terminal of the inverting amplifier module 103, coupled to the output terminal of the first filter module 101. The inverting input terminal of the second amplifier 1031 (using "+") is used as the first input terminal of the inverting amplifier module 103. Figure 16 (Used as a "-") is used as the second input terminal of the inverting amplifier module 103, which is coupled to the output terminal of the second filter module 102. The first terminal of the fifth resistor is coupled to the output terminal of the second filter module 102, and the second terminal of the fifth resistor is coupled to the output terminal of the second amplifier 1031.

[0131] The non-inverting input of the second amplifier 1031 is used to receive the DC component, the inverting input of the second amplifier 1031 is used to receive the AC component, and the output of the second amplifier 1031 is used to output the first differential signal.

[0132] In one application scenario, based on Figure 7 The first filter module 101 shown and Figure 11The second filter module 102 shown has a non-inverting input terminal of the second amplifier 1031 coupled to the output terminal of the first amplifier 202, an inverting input terminal of the second amplifier 1031 coupled to the first terminal of the fifth resistor and the second terminal of the third resistor, and the second terminal of the fifth resistor coupled to the output terminal of the second amplifier 1031.

[0133] When the first filter module 101 outputs an AC component, the inverting input terminal of the second amplifier 1031 is used as the first input terminal of the inverting amplifier module 103 and coupled to the output terminal of the first filter module 101; the non-inverting input terminal of the second amplifier 1031 is used as the second input terminal of the inverting amplifier module 103 and coupled to the output terminal of the second filter module 102; the first terminal of the fifth resistor is coupled to the output terminal of the first filter module 101, and the second terminal of the fifth resistor is coupled to the output terminal of the second amplifier 1031.

[0134] The non-inverting input of the second amplifier 1031 is used to receive the DC component, the inverting input of the second amplifier 1031 is used to receive the AC component, and the output of the second amplifier 1031 is used to output the first differential signal.

[0135] In one application scenario, based on Figure 7 The first filter module 101 shown and Figure 15 The second filter module 102 shown has a non-inverting input terminal of the second amplifier 1031 coupled to the second terminal of the nineteenth resistor and the second plate of the first capacitor. The inverting input terminal of the second amplifier 1031 is coupled to the output terminal of the first amplifier 202 and the first terminal of the fifth resistor. The second terminal of the fifth resistor is coupled to the output terminal of the second amplifier 1031.

[0136] According to some embodiments provided in this application, such as Figure 17 As shown, Figure 17 This is a circuit schematic diagram of the in-phase follower module in some embodiments of this application.

[0137] like Figure 17 As shown, the in-phase follower module 104 includes a third amplifier 1041 and a sixth resistor ( Figure 17 (Used as "R6" in Chinese).

[0138] Among them, the non-inverting input terminal of the third amplifier 1041 ( Figure 17 (Used as a "+") is coupled to the output of the first filter module 101 and the output of the second filter module 102. The first end of the sixth resistor is coupled to the inverting input of the third amplifier 1041. Figure 17 (Used as a "-" in the diagram), the second end of the sixth resistor is coupled to the output of the third amplifier 1041.

[0139] The non-inverting input of the third amplifier 1041 is used to receive the DC component and the AC component, and the output of the third amplifier 1041 is used to output the second differential signal.

[0140] In one application scenario, based on Figure 7 The first filter module 101 shown and Figure 11 The second filter module 102 shown has a non-inverting input terminal of the third amplifier 1041 coupled to the output terminal of the first amplifier 202 and the second terminal of the fourth resistor. The inverting input terminal of the third amplifier 1041 is coupled to the first terminal of the sixth resistor, and the second terminal of the sixth resistor is coupled to the output terminal of the third amplifier 1041.

[0141] In one application scenario, based on Figure 7 The first filter module 101 shown and Figure 15 The second filter module 102 shown has a non-inverting input terminal of the third amplifier 1041 coupled to the output terminal of the first amplifier 202, the second terminal of the twentieth resistor, and the second plate of the second capacitor. The inverting input terminal of the third amplifier 1041 is coupled to the first terminal of the sixth resistor, and the second terminal of the sixth resistor is coupled to the output terminal of the third amplifier 1041.

[0142] In some embodiments, when the first filter module 101 outputs a DC component or an AC component, the single-ended to differential output circuit 10 further includes a ninth resistor. One end of the ninth resistor is coupled to the output terminal of the first filter module 101, and the second end of the ninth resistor is coupled to the first input terminal of the in-phase follower module 104. The ninth resistor can protect against the process of the second DC component and the AC component being superimposed onto the in-phase follower module 104. Furthermore, the ninth resistor can protect against the process of the DC component and the second AC component being superimposed onto the in-phase follower module 104.

[0143] Specifically, based on Figure 7 The first filter module 101 shown and Figure 11 The second filter module 102 shown has a ninth resistor whose first end is coupled to the output of the first amplifier 202, and a ninth resistor whose second end is coupled to the second end of the fourth resistor and the non-inverting input of the third amplifier 1041.

[0144] Specifically, based on Figure 7 The first filter module 101 shown and Figure 15 The second filter module 102 shown has a first end of the ninth resistor coupled to the output of the first amplifier 202, and a second end of the ninth resistor coupled to the second end of the twentieth resistor, the second plate of the second capacitor, and the non-inverting input of the third amplifier 1041.

[0145] In some embodiments, when the first filter module 101 outputs an AC component, the single-ended to differential output circuit 10 further includes a third resistor. The first end of the third resistor is coupled to the output terminal of the first filter unit 1011, and the second end of the third resistor is coupled to the second input terminal of the inverting amplifier module 103. The third resistor can protect the process of the first DC component and the AC component being superimposed on the inverting amplifier module 103.

[0146] Specifically, based on Figure 7 The first filter module 101 shown and Figure 15 The second filter module 102 shown has a third resistor whose first end is coupled to the output of the first amplifier 202, and a third resistor whose second end is coupled to the inverting input of the second amplifier 1031 and the first end of the fifth resistor.

[0147] In some embodiments, when the first filter module 101 outputs an AC component, the single-ended to differential output circuit 10 further includes a fourth resistor. The first end of the fourth resistor is coupled to the output terminal of the third filter unit 1022, and the second end of the fourth resistor is coupled to the first input terminal of the in-phase follower module 104. The fourth resistor can protect the process of the second DC component and the AC component being superimposed onto the in-phase follower module 104.

[0148] Specifically, based on Figure 14 The third filter unit 1022 shown and Figure 17 The non-inverting follower module 104 shown has a first terminal of the fourth resistor coupled to the second terminal of the twentieth resistor and the second plate of the second capacitor, and the second terminal of the fourth resistor coupled to the non-inverting input terminal of the third amplifier 1041.

[0149] In some embodiments, when the first filter module 101 outputs an AC component, the single-ended to differential output circuit 10 further includes a twenty-third resistor. The first end of the twenty-third resistor is coupled to the output terminal of the second filter unit 1021, and the second end of the twenty-third resistor is coupled to the first input terminal of the inverting amplifier module 103. The twenty-third resistor can protect the process of the first DC component and the AC component being superimposed on the inverting amplifier module 103.

[0150] Specifically, based on Figure 15 The second filter module 102 shown and Figure 16 The inverting amplifier module 103 shown has its first end of the twenty-third resistor coupled to the second end of the nineteenth resistor and the second plate of the first capacitor, and its second end of the twenty-third resistor coupled to the non-inverting input of the second amplifier 1031.

[0151] In summary, see Figure 18 , Figure 18This is a circuit diagram of a single-ended to differential output circuit in some embodiments of this application. The single-ended to differential output circuit 10 includes 18 resistors, 6 amplifiers and 8 capacitors.

[0152] Among them, the 18 resistors are the first resistor ( Figure 18 (Represented by "R1"), second resistor ( Figure 18 (Represented by "R2"), the third resistor ( Figure 18 (Represented by "R3"), the fourth resistor ( Figure 18 (Represented by "R4"), the fifth resistor ( Figure 18 (Represented by "R5"), the sixth resistor ( Figure 18 (Represented by "R6"), the seventh resistor ( Figure 18 (Represented by "R7"), the eighth resistor ( Figure 18 (Represented by "R8") Ninth resistor ( Figure 18 (represented by "R9"), the tenth resistor ( Figure 18 (Represented by "R10"), eleventh resistor ( Figure 18 (Represented by "R11"), the twelfth resistor ( Figure 18 (Represented by "R12"), the thirteenth resistor ( Figure 18 (Represented by "R13"), the fourteenth resistor ( Figure 18 (Represented by "R14"), the fifteenth resistor ( Figure 18 (Represented by "R15"), the sixteenth resistor ( Figure 18 (Represented by "R16"), the seventeenth resistor ( Figure 18 (represented by "R17") and the eighteenth resistor ( Figure 18 (Used as "R18" in Chinese).

[0153] The six amplifiers are the first amplifier 202, the second amplifier 1031, the third amplifier 1041, the fourth amplifier 203, the fifth amplifier 204, and the sixth amplifier 205.

[0154] Among them, the 8 capacitors are the first capacitor ( Figure 18 (C1 is used as an indicator in the text), the second capacitor ( Figure 18 (C2 is used as a reference in the text), the third capacitor ( Figure 18 (C3 is used as a symbol in the middle), the fourth capacitor ( Figure 18 (C4 is used as a descriptor in the text), the fifth capacitor ( Figure 18 (C5 is used as an indicator in the text), the sixth capacitor ( Figure 18 (C6 is used as an indicator in the text), the seventh capacitor ( Figure 18 (represented by "C7") and the eighth capacitor ( Figure 18 (C8 is used as a symbol in Chinese).

[0155] The second terminal of the seventh resistor is used to receive the I signal. Figure 18 (Indicated by "Vi_in"), the first terminal of the seventh resistor is coupled to the first plate of the third capacitor, the second plate of the third capacitor is grounded, the first terminal of the eighth resistor is coupled to the first terminal of the seventh resistor and the first plate of the third capacitor, and the second terminal of the eighth resistor is coupled to the first plate of the fourth capacitor and the non-inverting input terminal of the first amplifier 202. Figure 18 (Used as "+"), the second plate of the fourth capacitor is grounded, and the first terminal of the first resistor is coupled to the inverting input terminal of the first amplifier 202. Figure 18 (Used as a "-" in the diagram), the second end of the first resistor is grounded, the first end of the second resistor is coupled to the inverting input of the first amplifier 202, and the second end of the second resistor is coupled to the output of the first amplifier 202.

[0156] The first plate of the first capacitor is used to receive the I signal, the second plate of the first capacitor is coupled to the first terminal of the third resistor, and the second terminal of the third resistor is coupled to the inverting input terminal of the second amplifier 1031. Figure 18 (Used as a "-"), the first end of the fifth resistor is coupled to the inverting input of the second amplifier 1031, the second end of the fifth resistor is coupled to the output of the second amplifier 1031, and the non-inverting input of the second amplifier 1031 (…). Figure 18 The output of the first amplifier 202 is coupled to the output of the second amplifier 1031 (indicated by "+"). The differential signal output from the second amplifier 1031 is the first differential signal. Figure 18 (This is illustrated in Chinese using "Vi_out+").

[0157] The first plate of the second capacitor is used to receive the I signal. The second plate of the second capacitor is coupled to the first terminal of the fourth resistor. The second terminal of the fourth resistor is coupled to the non-inverting input terminal of the third amplifier 1041. Figure 18 (Used as "+"), the first terminal of the ninth resistor is coupled to the output terminal of the first amplifier 202, the second terminal of the ninth resistor is coupled to the non-inverting input terminal of the third amplifier 1041, and the first terminal of the sixth resistor is coupled to the inverting input terminal of the third amplifier 1041. Figure 18 (Used as a "-" in the diagram), the second terminal of the sixth resistor is coupled to the output terminal of the third amplifier 1041, and the differential signal output from the output terminal of the third amplifier 1041 is the second differential signal ( Figure 18 (In Chinese, "Vi_out-" is used as an example).

[0158] The second terminal of the tenth resistor is used to receive the Q signal. Figure 18 (Indicated by "Vq_in"), the first end of the tenth resistor is coupled to the first plate of the fifth capacitor and the first end of the eleventh resistor. The second plate of the fifth capacitor is grounded. The second end of the eleventh resistor is coupled to the first plate of the sixth capacitor and the non-inverting input of the fourth amplifier 203. Figure 18(Used as "+"), the second plate of the sixth capacitor is grounded, and the first end of the twelfth resistor is coupled to the inverting input of the fourth amplifier 203. Figure 18 (Used as a "-" in the diagram), the second end of the twelfth resistor is grounded, the first end of the thirteenth resistor is coupled to the inverting input of the fourth amplifier 203, and the second end of the thirteenth resistor is coupled to the output of the fourth amplifier 203.

[0159] The first plate of the seventh capacitor is used to receive the Q signal, and the second plate of the seventh capacitor is coupled to the first terminal of the fourteenth resistor. The second terminal of the fourteenth resistor is coupled to the inverting input terminal of the fifth amplifier 204. Figure 18 (Used as a "-"), the first end of the fifteenth resistor is coupled to the inverting input of the fifth amplifier 204, and the second end of the fifteenth resistor is coupled to the output of the fifth amplifier 204. The non-inverting input of the fifth amplifier 204 is... Figure 18 The output of the fifth amplifier 204 is coupled to the output of the fourth amplifier 203 (indicated by "+"). The differential signal output from the fifth amplifier 204 is the third differential signal. Figure 18 (This is illustrated in Chinese using "Vq_out+").

[0160] The first plate of the eighth capacitor is used to receive the Q signal, and the second plate of the eighth capacitor is coupled to the first terminal of the sixteenth resistor. The second terminal of the sixteenth resistor is coupled to the non-inverting input of the sixth amplifier 205. Figure 18 (Used as a "+"), the first terminal of the seventeenth resistor is coupled to the output terminal of the fourth amplifier 203, the second terminal of the seventeenth resistor is coupled to the non-inverting input terminal of the sixth amplifier 205, and the first terminal of the eighteenth resistor is coupled to the inverting input terminal of the sixth amplifier 205. Figure 18 (Used as a "-"), the second terminal of the eighteenth resistor is coupled to the output terminal of the sixth amplifier 205. The differential signal output from the sixth amplifier 205 is the fourth differential signal ( Figure 18 (This is illustrated in Chinese using "Vq_out-").

[0161] In one application scenario, based on Figure 18 The differential output circuit 10 shown, with the I and Q signals having a frequency of 1.944 kHz, has the following characteristics: the first and twelfth resistors are unsoldered resistors; the second and thirteenth resistors have a value of 0 ohms; the sixth, seventh, eighth, tenth, eleventh, and eighteenth resistors have a value of 1000 ohms; the third, fifth, fourteenth, and fifteenth resistors have a value of 1000 ohms; the fourth and sixteenth resistors have a value of 10 ohms; the ninth and seventeenth resistors have a value of 10000 ohms; the first, second, seventh, and eighth capacitors have a value of 1 μF; the third and fifth capacitors have a value of 0.22 μF; and the fourth and sixth capacitors have a value of 0.1 μF.

[0162] In summary, see Figure 19 , Figure 19 This is a circuit diagram of a single-ended to differential output circuit in some embodiments of this application. The single-ended to differential output circuit 10 includes 22 resistors, 6 amplifiers and 8 capacitors.

[0163] Among them, the 22 resistors are the first resistor ( Figure 19 (Represented by "R1"), second resistor ( Figure 19 (Represented by "R2"), the third resistor ( Figure 19 (Represented by "R3"), the fourth resistor ( Figure 19 (Represented by "R4"), the fifth resistor ( Figure 19 (Represented by "R5"), the sixth resistor ( Figure 19 (Represented by "R6"), the seventh resistor ( Figure 19 (Represented by "R7"), the eighth resistor ( Figure 19 (Represented by "R8") Ninth resistor ( Figure 19 (represented by "R9"), the tenth resistor ( Figure 19 (Represented by "R10"), eleventh resistor ( Figure 19 (Represented by "R11"), the twelfth resistor ( Figure 19 (Represented by "R12"), the thirteenth resistor ( Figure 19 (Represented by "R13"), the fourteenth resistor ( Figure 19 (Represented by "R14"), the fifteenth resistor ( Figure 19 (Represented by "R15"), the sixteenth resistor ( Figure 19 (Represented by "R16"), the seventeenth resistor ( Figure 19 (Represented by "R17"), the eighteenth resistor ( Figure 19 (Represented by "R18"), the nineteenth resistor ( Figure 19 (Represented by "R19"), the twentieth resistor ( Figure 19 (Represented by "R20"), the twenty-first resistor ( Figure 19 (represented by "R21") and the 22nd resistor ( Figure 19 (Represented by "R22" in Chinese).

[0164] The six amplifiers are the first amplifier 202, the second amplifier 1031, the third amplifier 1041, the fourth amplifier 203, the fifth amplifier 204, and the sixth amplifier 205.

[0165] Among them, the 8 capacitors are the first capacitor ( Figure 19 (C1 is used as an indicator in the text), the second capacitor ( Figure 19 (C2 is used as a reference in the text), the third capacitor ( Figure 19 (C3 is used as a symbol in the middle), the fourth capacitor ( Figure 19(C4 is used as a descriptor in the text), the fifth capacitor ( Figure 19 (C5 is used as an indicator in the text), the sixth capacitor ( Figure 19 (C6 is used as an indicator in the text), the seventh capacitor ( Figure 19 (represented by "C7") and the eighth capacitor ( Figure 19 (C8 is used as a symbol in Chinese).

[0166] The second plate of the third capacitor is used to receive the I signal. Figure 19 (Indicated by "Vi_in"), the first plate of the third capacitor is coupled to the first terminal of the seventh resistor and the first plate of the fourth capacitor. The second terminal of the seventh resistor is grounded. The second plate of the fourth capacitor is coupled to the first terminal of the eighth resistor and the non-inverting input terminal of the first amplifier 202. Figure 19 (Used as a "+" symbol in the diagram), the second terminal of the eighth resistor is grounded, and the first terminal of the first resistor is coupled to the inverting input terminal of the first amplifier 202. Figure 19 (Used as a "-" in the diagram), the second end of the first resistor is grounded, the first end of the second resistor is coupled to the inverting input of the first amplifier 202, and the second end of the second resistor is coupled to the output of the first amplifier 202.

[0167] The first terminal of the nineteenth resistor is used to receive the I signal. The second terminal of the nineteenth resistor is coupled to the second plate of the first capacitor, which is grounded. The second terminal of the nineteenth resistor and the second plate of the first capacitor are coupled to the non-inverting input terminal of the second amplifier 1031. Figure 19 (Used as "+"), the first end of the third resistor is coupled to the input terminal of the first amplifier 202, and the second end of the third resistor is coupled to the inverting input terminal of the second amplifier 1031. Figure 19 (Used as a "-"), the first end of the fifth resistor is coupled to the inverting input of the second amplifier 1031, and the second end of the fifth resistor is coupled to the output of the second amplifier 1031. The differential signal output by the second amplifier 1031 is the first differential signal ( Figure 19 (This is illustrated in Chinese using "Vi_out+").

[0168] The first terminal of the twentieth resistor is used to receive the I signal. The second terminal of the twentieth resistor is coupled to the second plate of the second capacitor and the first terminal of the fourth resistor. The first plate of the second capacitor is grounded. The second terminal of the fourth resistor is coupled to the non-inverting input terminal of the third amplifier 1041. Figure 19 (Used as "+"), the first terminal of the ninth resistor is coupled to the output terminal of the first amplifier 202, the second terminal of the ninth resistor is coupled to the non-inverting input terminal of the third amplifier 1041, and the first terminal of the sixth resistor is coupled to the inverting input terminal of the third amplifier 1041. Figure 19(Used as a "-" in the diagram), the second terminal of the sixth resistor is coupled to the output terminal of the third amplifier 1041, and the differential signal output from the output terminal of the third amplifier 1041 is the second differential signal ( Figure 19 (In Chinese, "Vi_out-" is used as an example).

[0169] The second plate of the fifth capacitor is used to receive the Q signal. Figure 19 (Indicated by "Vq_in"), the first plate of the fifth capacitor is coupled to the first terminal of the tenth resistor and the first plate of the sixth capacitor. The second terminal of the tenth resistor is grounded. The second plate of the sixth capacitor is coupled to the first terminal of the eleventh resistor and the non-inverting input terminal of the fourth amplifier 203. Figure 19 (Used as "+"), the second terminal of the eleventh resistor is grounded, and the first terminal of the twelfth resistor is coupled to the inverting input of the fourth amplifier 203. Figure 19 (Used as a "-" in the diagram), the second end of the twelfth resistor is grounded, the first end of the thirteenth resistor is coupled to the inverting input of the fourth amplifier 203, and the second end of the thirteenth resistor is coupled to the output of the fourth amplifier 203.

[0170] The first terminal of the twenty-first resistor is used to receive the Q signal, and the second terminal of the twenty-first resistor is coupled to the second plate of the seventh capacitor and the non-inverting input terminal of the fifth amplifier 204. Figure 19 (Used as "+"), the first plate of the seventh capacitor is grounded, the first end of the fourteenth resistor is coupled to the input of the fifth amplifier 204, and the second end of the fourteenth resistor is coupled to the inverting input of the fifth amplifier 204. Figure 19 (Used as a "-"), the first terminal of the fifteenth resistor is coupled to the inverting input of the fifth amplifier 204, and the second terminal of the fifteenth resistor is coupled to the output of the fifth amplifier 204. The differential signal output by the fifth amplifier 204 is the third differential signal. Figure 19 (This is illustrated in Chinese using "Vq_out+").

[0171] The first terminal of the twenty-second resistor is used to receive the Q signal. The second terminal of the twenty-second resistor is coupled to the second plate of the eighth capacitor and the first terminal of the sixteenth resistor. The first plate of the eighth capacitor is grounded. The second terminal of the sixteenth resistor is coupled to the non-inverting input of the sixth amplifier 205. Figure 19 (Used as a "+"), the first terminal of the seventeenth resistor is coupled to the output terminal of the fourth amplifier 203, the second terminal of the seventeenth resistor is coupled to the non-inverting input terminal of the sixth amplifier 205, and the first terminal of the eighteenth resistor is coupled to the inverting input terminal of the sixth amplifier 205. Figure 19 (Used as a "-"), the second terminal of the eighteenth resistor is coupled to the output terminal of the sixth amplifier 205. The differential signal output from the sixth amplifier 205 is the fourth differential signal ( Figure 19 (This is illustrated in Chinese using "Vq_out-").

[0172] In one application scenario, based on Figure 19 The differential output circuit 10 shown, with the I and Q signals having a frequency of 1.944 kHz, has the following characteristics: the first and twelfth resistors are unsoldered resistors; the second and thirteenth resistors have a value of 0 ohms; the sixth, seventh, eighth, tenth, eleventh, eighteenth, nineteenth, twentieth, twenty-first, and twenty-second resistors have a value of 1000 ohms; the third, fifth, fourteenth, and fifteenth resistors have a value of 1000 ohms; the fourth and sixteenth resistors have a value of 10000 ohms; the ninth and seventeenth resistors have a value of 10 ohms; the first, second, seventh, and eighth capacitors have a value of 0.1 μF; and the third, fourth, fifth, and sixth capacitors have a value of 1 μF.

[0173] According to some embodiments provided in this application, such as Figure 20 and Figure 21 As shown, Figure 20 and Figure 21 These are schematic diagrams of the communication devices in some embodiments of this application.

[0174] In some embodiments, such as Figure 20 As shown, the communication device 1000 includes a single-ended to differential output circuit 10 according to any of the above embodiments.

[0175] In other embodiments, such as Figure 21 As shown, the communication device 1000 includes a single-ended to differential output circuit 10, a radio frequency circuit 20, a processing chip 30, and a digital-to-analog converter 40, as described in any of the above embodiments.

[0176] The first end of the digital-to-analog converter 40 is coupled to the processing chip 30, and the second end of the digital-to-analog converter 40 is coupled to the input end of the single-ended to differential output circuit 10. The digital-to-analog converter 40 is used to provide the target signal to the single-ended to differential output circuit 10.

[0177] The input terminal of the radio frequency circuit 20 is coupled to the output terminal of the single-ended to differential output circuit 10. The radio frequency circuit 20 is used to receive the first differential signal and the second differential signal.

[0178] It is understandable that the single-ended to differential output circuit 10, the processing chip 30, and the digital-to-analog converter 40 all belong to the radio frequency front-end circuit.

[0179] In some embodiments, the processing chip 30 is based on the logic implementation of an FPGA (Field Programmable Gate Array).

[0180] In other embodiments, the processing chip 30 may be implemented based on the logic of an MCU (Microcontroller Unit) or a DSP (Digital Signal Processing), without limitation. It is understood that the processing chip 30 implemented based on MCU or DSP logic has lower flexibility and performance compared to the processing chip 30 implemented based on FPGA logic.

[0181] In summary, the single-ended to differential output circuit 10 and communication device 1000 provided in some embodiments of this application can convert the target signal into a differential signal and output it to the radio frequency circuit 20, so that the first differential signal and the second differential signal input to the radio frequency circuit 20 have the same amplitude and a phase difference of 180°.

[0182] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A single-ended to differential output circuit, characterized by, The single-ended to differential output circuit includes at least one conversion circuit, each of which is configured to receive a target signal and differentially convert the target signal to output to an RF circuit. Each of the aforementioned conversion circuits includes: The first filtering module is used to receive the target signal and output the DC component or AC component of the target signal. The second filtering module is used to receive the target signal and output the AC component or DC component of the target signal; wherein the signal types output by the first filtering module and the second filtering module are different. An inverting amplifier module is provided, which is coupled to the output terminals of the first filter module and the second filter module respectively. The inverting amplifier module is used to receive the DC component and the AC component and output a first differential signal to the radio frequency circuit. The in-phase follower module is coupled to the output terminals of the second filter module and the first filter module respectively. The in-phase follower module is used to receive the DC component and the AC component and output a second differential signal to the radio frequency circuit. The second differential signal has the same amplitude as the first differential signal and the phase difference between the second differential signal and the first differential signal is 180°.

2. The single-ended to differential output circuit of claim 1, wherein, The first filtering module includes: The first filtering unit is used to receive the target signal; The first amplification unit is coupled to the output terminal of the first filtering unit and outputs the DC component or AC component of the target signal.

3. The single-ended to differential output circuit according to claim 2, characterized in that, The first filtering unit includes at least one RC filter circuit and / or at least one LC filter circuit.

4. The single-ended to differential output circuit according to claim 2, characterized in that, The first amplification unit includes a first amplifier. The non-inverting input terminal of the first amplifier is coupled to the output terminal of the first filter unit. The inverting input terminal of the first amplifier is grounded through a first resistor, and the inverting input terminal of the first amplifier is coupled to the output terminal of the first amplifier through a second resistor. The output terminal of the first amplifier is used to output the DC component or the AC component.

5. The single-ended to differential output circuit according to claim 1, characterized in that, When the first filtering module outputs the DC component, the second filtering module includes: The second filtering unit is used to receive the target signal and output the first AC component to the inverting amplifier module; The third filtering unit is used to receive the target signal and output the second AC component to the in-phase follower module.

6. The single-ended to differential output circuit according to claim 5, characterized in that, The second filtering unit includes: A first capacitor, wherein the first plate of the first capacitor is used to receive the target signal; The third resistor has its first end coupled to the second plate of the first capacitor, and its second end is used to output the first AC component to the inverting amplifier module. And / or, The third filtering unit includes: The second capacitor has a first plate used to receive the target signal. The fourth resistor has its first end coupled to the second plate of the second capacitor, and its second end is used to output the second AC component to the in-phase follower module.

7. The single-ended to differential output circuit according to claim 1, characterized in that, When the first filtering module outputs the AC component, the second filtering module includes: The second filtering unit is used to receive the target signal and output the first DC component to the inverting amplifier module; The third filtering unit is used to receive the target signal and output the second DC component to the in-phase follower module.

8. The single-ended to differential output circuit according to claim 7, characterized in that, The second filtering unit includes at least one RC filter structure and / or at least one LC filter structure; And / or, The third filtering unit includes at least one RC filter structure and / or at least one LC filter structure.

9. The single-ended to differential output circuit according to claim 1, characterized in that, The inverting amplifier module includes: a second amplifier and a fifth resistor; When the first filter module outputs the DC component, the non-inverting input terminal of the second amplifier is coupled to the output terminal of the first filter module; the inverting input terminal of the second amplifier is coupled to the output terminal of the second filter module; the first terminal of the fifth resistor is coupled to the output terminal of the second filter module, and the second terminal of the fifth resistor is coupled to the output terminal of the second amplifier. When the first filter module outputs the AC component, the inverting input terminal of the second amplifier is coupled to the output terminal of the first filter module; the non-inverting input terminal of the second amplifier is coupled to the output terminal of the second filter module; the first terminal of the fifth resistor is coupled to the output terminal of the first filter module, and the second terminal of the fifth resistor is coupled to the output terminal of the second amplifier. And / or, The in-phase follower module includes: a third amplifier and a sixth resistor; The non-inverting input of the third amplifier is coupled to the output of the first filter module and the output of the second filter module; the first end of the sixth resistor is coupled to the inverting input of the third amplifier, and the second end of the sixth resistor is coupled to the output of the third amplifier.

10. A communication device, characterized in that, The communication device includes a single-ended to differential output circuit as described in any one of claims 1-9.

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