VI source device

Abstract

The invention discloses a VI source device which comprises a signal generation module, a signal processing module and a power amplification module. The signal generation module is used for outputting a first AC signal. The signal processing module is connected with the signal generation module, and the signal processing module is used for performing error amplification and integration processing on the first alternating current signal; the power amplification module is connected with the signal processing module and a tested device, the power amplification module is used for performing power amplification on a signal output by the signal processing module and then generating a target alternating current signal, and the target alternating current signal is used for providing an excitation power supply for the tested device; wherein the target alternating current signal is an alternating current signal with direct current bias. The VI source device provided by the invention not only covers a direct current signal output measurement application scene of a traditional VI source, but also is suitable for application of alternating current signal output measurement, and the use scene of the VI source is expanded.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit design, and in particular to a VI source device. Background Art

[0002] VI source is a universal DC voltage and current source, mainly used in various automatic test equipment or automatic test systems. VI source can work in programmable voltage source mode and programmable current source mode, output voltage and current respectively, and can work in clamping current and clamping voltage.

[0003] At present, the VI source is generally composed of an operational amplifier and a corresponding feedback network. The output impedance is very low and can provide a constant current output, which is not affected by the load impedance connected to it. However, the VI source outputs a DC signal and is generally used in scenarios where DC signal output is measured. It cannot meet the scenario where AC signal output is measured, and the scope of application scenarios is relatively narrow. Summary of the invention

[0004] The present invention provides a VI source device to solve the problem that the prior art cannot meet the scenario of AC signal output measurement and has a narrow range of application scenarios.

[0005] According to one aspect of the present invention, there is provided a VI source device, comprising a signal generating module, a signal processing module and a power amplifying module;

[0006] The signal generating module is used to output a first AC signal;

[0007] The signal processing module is connected to the signal generating module, and the signal processing module is used to perform error amplification and integration processing on the first AC signal;

[0008] The power amplification module is connected to the signal processing module and the device under test. The power amplification module is used to generate a target AC signal after power amplifying the signal output by the signal processing module. The target AC signal is used to provide an excitation power supply for the device under test; wherein the target AC signal is an AC signal with a DC bias.

[0009] Optionally, the signal generating module includes a waveform generating unit, a DC bias unit and an adder unit, the waveform generating unit is used to generate a second AC signal, the DC bias unit is used to generate a DC signal, the adder unit connects the waveform generating unit and the DC bias unit, and the adder unit is used to generate the first AC signal based on the second AC signal and the DC signal.

[0010] Optionally, the DC bias unit includes a digital-to-analog conversion chip, a first resistor and a second resistor, the input end of the digital-to-analog conversion chip is connected to a first control signal, the first end of the first resistor is connected to a first output end of the digital-to-analog conversion chip, the second end of the first resistor is connected to the input end of the adder unit, the first end of the second resistor is connected to the second output end of the digital-to-analog conversion chip, and the second end of the second resistor is connected to the input end of the adder unit.

[0011] Optionally, the adder unit includes a first adder, a solid-state relay, a third resistor, a fourth resistor, a fifth resistor and a first capacitor, the negative input end of the first adder is connected to the input end of the adder unit, the first end of the third resistor, the first end of the fourth resistor and the first end of the first capacitor, the positive input end of the first adder is grounded, the output end of the first adder is connected to the second end of the third resistor, the second end of the first capacitor, the third end of the solid-state relay and the output end of the adder unit, the fourth end of the solid-state relay is connected to the second end of the fourth resistor, the first end of the solid-state relay is connected to the first end of the fifth resistor, the second end of the fifth resistor is connected to the second control signal, and the second end of the solid-state relay is grounded.

[0012] Optionally, the signal processing module includes an error amplification unit and an integration unit, the error amplification unit is connected in parallel with the integration unit, the error amplification unit is used to amplify the error of the first AC signal, and the integration unit is used to perform integration processing on the first AC signal.

[0013] Optionally, the error amplification unit includes a first operational amplifier and a sixth resistor, and the integration unit includes a seventh resistor, a second capacitor and a third capacitor; the negative input terminal of the first operational amplifier is connected to the first end of the sixth resistor, the first end of the seventh resistor and the first end of the second capacitor, the second end of the sixth resistor is connected to the input terminal of the signal processing module, the second end of the seventh resistor is connected to the first end of the third capacitor, the second end of the third capacitor is connected to the second end of the second capacitor, the output terminal of the first operational amplifier and the output terminal of the signal processing module, and the positive input terminal of the first operational amplifier is grounded.

[0014] Optionally, the VI source device further includes a feedback module, which is connected between an input end of the device under test and an input end of the signal processing module, and is used to feed back an electrical signal input by the device under test to the signal processing module.

[0015] Optionally, the feedback module includes a voltage feedback unit and a current feedback unit, the voltage feedback unit is connected between the input end of the device under test and the input end of the signal processing module, and the voltage feedback unit is used to feed back the voltage signal in the excitation power supply; the current feedback unit is connected between the input end of the device under test and the input end of the signal processing module, and the current feedback unit is used to feed back the current signal in the excitation power supply.

[0016] Optionally, the VI source device also includes an acquisition module and a control module, the acquisition module is connected to the feedback module and the control module, the acquisition module is used to acquire the electrical signal in the feedback module and output an acquisition signal, and the control module is used to perform data detection according to the acquisition signal.

[0017] Optionally, the acquisition module includes a DC acquisition unit and an AC acquisition unit, the DC acquisition unit is connected to the voltage feedback unit, the current feedback unit and the control module, and the DC acquisition unit is used to acquire the DC voltage output by the voltage feedback unit and the DC current output by the current feedback unit; the AC acquisition unit is connected to the voltage feedback unit, the current feedback unit and the control module, and the AC acquisition unit is used to acquire the AC voltage output by the voltage feedback unit and the AC current output by the current feedback unit; the control module is used to perform data detection according to the signal output by the DC acquisition unit and the signal output by the AC acquisition unit.

[0018] The technical solution of the embodiment of the present invention provides a VI source device, which generates a first AC signal by setting a signal generating module, and the signal processing module is used to perform error amplification and integration processing on the first AC signal and then input it into the power amplifier module, and the power amplifier module is used to generate a target AC signal after power amplification on the signal output by the signal processing module, and the target AC signal is used to provide an excitation power supply for the device under test, wherein the target AC signal is an AC signal with a DC bias, which can provide an AC signal or a DC signal for the device under test. The VI source device provided by the present invention not only covers the DC signal output measurement application scenario of the traditional VI source, but is also suitable for the application of AC signal output measurement, thereby expanding the use scenario of the VI source and solving the problem that the prior art cannot meet the scenario of AC signal output measurement and the application scenario is narrow.

[0019] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a VI source circuit diagram in the related art;

[0022] Figure 2 It is a structural schematic diagram of a VI source device provided by an embodiment of the present invention;

[0023] Figure 3 is a circuit diagram of a VI source device provided by an embodiment of the present invention;

[0024] Figure 4 It is a circuit diagram of another VI source device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0027] VI source is a universal DC voltage and current source, mainly used in various automatic test equipment or automatic test systems. VI source can work in programmable voltage source mode and programmable current source mode, output voltage and current respectively, and can work in clamping current and clamping voltage.

[0028] Figure 1It is a VI source circuit diagram in the related technology, such as Figure 1 As shown, it is implemented by an integral amplifier circuit U01, a feedback amplifier circuit and an output stage circuit. The feedback amplifier circuit usually uses a high-precision differential amplifier U02 and has the characteristics of high input impedance. The output stage usually uses a power amplifier U03 to ensure the stability of the output voltage when the load changes. It also includes an error amplifier U04, a buffer U05, a resistor R, a capacitor C, a switch S01, a switch S02, an output terminal F and a test terminal S. In the voltage source mode, the output voltage is controlled by the set voltage value Vin and the circuit amplification factor. The output voltage signal is fed back to the input terminal of the error amplifier through the differential amplifier through the program-controlled switch VI / MODE. Similarly, in the current source mode, the output current is controlled by the set voltage value, the circuit amplification factor and the size of the sampling resistor R0. The selection of the sampling resistor is controlled by the relay circuit. The current signal of the sampling resistor is fed back to the input terminal of the operational amplifier through the program-controlled switch V / I MODE to realize the current drive of the entire circuit. The output of the clamp circuit is set at the input part of the integral amplifier circuit. The amplitude of the output signal is limited by setting the clamp voltage or clamp current. The clamp mode is selected by the programmable switch V / I MODE.

[0029] The above VI source outputs a DC signal, which is generally used in scenarios where DC signal output is measured, but cannot meet the requirements of AC signal output measurement, and the scope of application scenarios is relatively narrow.

[0030] To solve the above problems, an embodiment of the present invention provides a VI source device. Figure 2 is a schematic diagram of the structure of a VI source device provided by an embodiment of the present invention, such as Figure 2 As shown, the VI source device includes a signal generating module 110, a signal processing module 120 and a power amplifying module 130; the signal generating module 110 is used to output a first AC signal; the signal processing module 120 is connected to the signal generating module, and the signal processing module 120 is used to perform error amplification and integration processing on the first AC signal; the power amplifying module 130 is connected to the signal processing module 120 and the device under test, and the power amplifying module 130 is used to generate a target AC signal after power amplification of the signal output by the signal processing module 120, and the target AC signal is used to provide an excitation power supply for the device under test; wherein, the target AC signal is an AC signal with a DC bias.

[0031] In this embodiment, the signal generating module 110 is a device that can generate electronic signals of various waveforms, frequencies and amplitudes, and can be used as a test signal source or excitation source when measuring the amplitude characteristics, frequency characteristics, transmission characteristics and other electrical parameters of various telecommunication systems or telecommunication equipment. The signal processing module 120 is a module that performs signal processing on the first AC signal. For example, the signal processing module can perform error amplification, integration processing and other processing on the first AC signal. The power amplification module 130 is a module that performs power amplification, and its principle is to enhance the power of the signal by modulating and amplifying the input signal.

[0032] In this embodiment, the signal generating module 110 outputs a first AC signal, and the signal processing module 120 performs error amplification and integration processing on the first AC signal, wherein the error amplification processing can amplify weak signals and reduce noise and interference, and the integration link can improve the static error of the system. The power amplification module 130 performs power amplification on the signal output by the signal processing module 120 to generate a target AC signal, and the target AC signal is used to provide an excitation power supply for the device under test, wherein the target AC signal is an AC signal with a DC bias, which can provide both an AC signal and a DC signal for the device under test.

[0033] The technical solution of the embodiment of the present invention provides a VI source device, which generates a first AC signal by setting a signal generating module, and the signal processing module is used to perform error amplification and integration processing on the first AC signal and then input it into the power amplifier module, and the power amplifier module is used to generate a target AC signal after power amplification on the signal output by the signal processing module, and the target AC signal is used to provide an excitation power supply for the device under test, wherein the target AC signal is an AC signal with a DC bias, which can provide an AC signal or a DC signal for the device under test. The VI source device provided by the present invention not only covers the DC signal output measurement application scenario of the traditional VI source, but is also suitable for the application of AC signal output measurement, thereby expanding the use scenario of the VI source and solving the problem that the prior art cannot meet the scenario of AC signal output measurement and the application scenario is narrow.

[0034] Figure 3 is a circuit diagram of a VI source device provided by an embodiment of the present invention, such as Figure 3 As shown, the signal generating module 110 includes a waveform generating unit 111, a DC bias unit 112 and an adder unit 113, the waveform generating unit 111 is used to generate a second AC signal, the DC bias unit 112 is used to generate a DC signal, the adder unit 113 connects the waveform generating unit 111 and the DC bias unit 112, and the adder unit 113 is used to generate a first AC signal according to the second AC signal and the DC signal.

[0035] In this embodiment, the waveform generating unit 111 is a device capable of generating various waveform signals. For example, the waveform generating unit 111 includes a waveform generator. The waveform generating unit 111 also includes an eighth resistor R8. The first end of the eighth resistor R8 is connected to the output end of the waveform generator, and the second end of the eighth resistor R8 is connected to the input end of the adder unit 113. The DC bias unit 112 refers to a device or component in an electronic circuit that adjusts the operating point of the circuit to a suitable range by adding a constant voltage or current to ensure that the circuit has a stable and reliable output under normal working conditions. The adder unit 113 is a unit for performing addition operations. For example, the adder unit 113 includes an adder. The adder unit 113 adds the second AC signal and the DC signal to obtain a first AC signal. The first AC signal is an AC signal with a DC bias, which can ensure the stability and reliability of the circuit.

[0036] Specifically, the DC bias unit 112 includes a digital-to-analog conversion chip U1, a first resistor R1 and a second resistor R2. The input end of the digital-to-analog conversion chip U1 is connected to the first control signal kz1, the first end of the first resistor R1 is connected to the first output end of the digital-to-analog conversion chip U1, the second end of the first resistor R1 is connected to the input end of the adder unit 113, the first end of the second resistor R2 is connected to the second output end of the digital-to-analog conversion chip U1, and the second end of the second resistor R2 is connected to the input end of the adder unit 113.

[0037] In this embodiment, the DC bias unit 112 also includes a fourth capacitor C4, and the digital-to-analog conversion chip U1 includes a pin RSTSEL, a pin RESET#, a pin SDIN, a pin SYNC#, a pin SCLK, a pin VLOGIC, a pin GAIN, a pin LDAC#, a pin VREF, a pin VOUTB, a pin VOUTA, a pin GND, and a pin VDD, wherein the pin RSTSEL, the pin RESET#, the pin VLOGIC, the pin GAIN, and the pin VDD are connected to the first power supply V1, the pin SDIN is a data input pin, the pin SYNC# is a synchronization signal pin, and the pin SCLK is a serial clock pin. The digital-to-analog conversion chip U1 converts the first control signal kz1 connected to the analog signal into an analog signal, wherein the first control signal kz1 can be a digital signal output by the control module, and the analog signal is a DC voltage signal. The first resistor R1 and the second resistor R2 respectively adjust the DC voltage signal so that the output DC signal meets the preset requirements, and the voltage value of the first power supply V1 is 5V. Referring to the above embodiment, the adder unit 113 generates a first AC signal according to the second AC signal and the adjusted DC signal.

[0038] Continue to refer Figure 3The adder unit 113 includes a first adder U2, a solid-state relay U3, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a first capacitor C1. The negative input end of the first adder U2 is connected to the input end of the adder unit 113, the first end of the third resistor R3, the first end of the fourth resistor R4 and the first end of the first capacitor C1. The positive input end of the first adder U2 is grounded. The output end of the first adder U2 is connected to the second end of the third resistor R3, the second end of the first capacitor C1, the third end of the solid-state relay U3 and the output end of the adder unit 113. The fourth end of the solid-state relay U3 is connected to the second end of the fourth resistor R4. The first end of the solid-state relay U3 is connected to the first end of the fifth resistor R5. The second end of the fifth resistor R5 is connected to the second control signal kz2. The second end of the solid-state relay U3 is grounded.

[0039] In this embodiment, the first capacitor C1 is a filter capacitor, the second control signal kz2 can be output by the control module, the solid-state relay U3 is turned on or off according to the second control signal, when the solid-state relay U3 is turned on, the fourth resistor R4 and the fifth resistor R5 are connected in parallel, when the solid-state relay U3 is disconnected, only the fourth resistor R4 is connected to the circuit, the solid-state relay U3 is turned on or off according to the second control signal kz2, and the voltage output by the adder unit 113 is adjusted.

[0040] Figure 4 is a circuit diagram of another VI source device provided by an embodiment of the present invention, such as Figure 4 As shown, the signal processing module 120 includes an error amplifying unit 121 and an integrating unit 122, the error amplifying unit 121 and the integrating unit 122 are connected in parallel, the error amplifying unit 121 is used to amplify the error of the first AC signal, and the integrating unit 122 is used to integrate the first AC signal.

[0041] In this embodiment, the error amplification unit 121 is a unit that performs error amplification processing on the first AC signal, and is used to measure and control tiny signals in the system, and amplify these signals to a level that can be effectively processed or displayed. Based on the concept of negative feedback, when the actual measured value deviates from the expected value, the error amplification unit will generate an error signal, which is then amplified by the amplifier circuit and transmitted to the subsequent circuit or system through the output circuit to drive it to make necessary adjustments or compensation. The integration unit 122 is used to calculate the cumulative effect of the input signal, such as the charging process of the capacitor. By setting different parameters, such as initial conditions, external reset signals, etc., the parameters of the integration unit can be flexibly adjusted to meet different needs. The integration link can improve the static error of the system.

[0042] Specifically, the error amplification unit 121 includes a first operational amplifier U4 and a sixth resistor R6, and the integration unit 122 includes a seventh resistor R7, a second capacitor C2 and a third capacitor C3; the negative input terminal of the first operational amplifier U4 is connected to the first end of the sixth resistor R6, the first end of the seventh resistor R7 and the first end of the second capacitor C2, the second end of the sixth resistor R6 is connected to the input terminal of the signal processing module 120, the second end of the seventh resistor R7 is connected to the first end of the third capacitor C3, the second end of the third capacitor C3 is connected to the second end of the second capacitor C2, the output terminal of the first operational amplifier U4 and the output terminal of the signal processing module 120, and the positive input terminal of the first operational amplifier U4 is grounded.

[0043] In this embodiment, the first operational amplifier U4 performs error amplification processing on the input first AC signal, and the integration unit composed of the seventh resistor R7, the second capacitor C2 and the third capacitor C3 performs integration processing on the first AC signal. The first operational amplifier U4 is arranged in parallel with the integration unit, and error amplification and integration processing are performed on the first AC signal at the same time, making the circuit structure simpler.

[0044] Continue to refer Figure 4 The power amplifier module 130 includes a ninth resistor R9, a second operational amplifier U5 and a third operational amplifier U6, the second operational amplifier U5 and the third operational amplifier U6 are connected in series, the positive power reference end of the second operational amplifier U5 and the third operational amplifier U6 is connected to the second power supply V2, the negative power reference end of the second operational amplifier U5 and the third operational amplifier U6 is connected to the third power supply V3, the second operational amplifier U5 and the third operational amplifier U6 realize two-stage amplification of the signal, the voltage value of the second power supply V2 is 15V, and the voltage value of the third power supply V3 is -15V.

[0045] Continue to refer Figure 4 The VI source device also includes a feedback module 410, which is connected between the input end of the device under test and the input end of the signal processing module 120. The feedback module 410 is used to feed back the electrical signal input by the device under test to the signal processing module 120. Among them, the feedback module 410 returns the signal output by the VI source device to the input end. Based on the concept of negative feedback, the output signal is compared with the expected value to generate an error signal, and then the input is adjusted to reduce or eliminate the error signal. This adjustment can be achieved by changing the size, phase or other properties of the input signal. Through continuous adjustment, the system can achieve the desired output state to affect the input signal and improve the stability and accuracy of the system.

[0046] Specifically, the feedback module 410 includes a voltage feedback unit 411 and a current feedback unit 412. The voltage feedback unit 411 is connected between the input end of the device under test and the input end of the signal processing module 120, and the voltage feedback unit 411 is used to feedback the voltage signal in the excitation power supply; the current feedback unit 412 is connected between the input end of the device under test and the input end of the signal processing module 120, and the current feedback unit 412 is used to feedback the current signal in the excitation power supply.

[0047] In this embodiment, the voltage feedback unit 411 includes a fourth operational amplifier U7, the positive input terminal of the fourth operational amplifier U7 is connected to the input terminal of the voltage feedback unit 411, and the negative input terminal of the fourth operational amplifier U7 is connected to the output terminal of the fourth operational amplifier U7 and the output terminal of the voltage feedback unit 411. The current feedback unit 412 includes a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a fifth capacitor C5, a first switch S1, a fifth operational amplifier U8, a sixth operational amplifier U9 and a seventh operational amplifier U10. Among them, the fourth operational amplifier U7 is a voltage follower, which feeds back the voltage signal in the excitation power supply to the input terminal of the signal processing module 120. The tenth resistor R10 and the eleventh resistor R11 are current collection resistors. When the first switch S1 is turned on, the tenth resistor R10 and the eleventh resistor R11 are connected in parallel as current collection resistors. When the first switch S1 is turned off, the eleventh resistor R11 is turned off, and the tenth resistor R10 is used as a current collection resistor. The first switch S1 can be a relay switch. The fifth operational amplifier U8, the sixth operational amplifier U9 and the seventh operational amplifier U10 constitute a differential amplifier circuit, and the current signal in the excitation power supply is fed back to the input end of the signal processing module 120 through the current collection resistor.

[0048] Continue to refer Figure 4 The VI source device also includes a collection module 420 and a control module 430. The collection module 420 is connected to the feedback module 410 and the control module 430. The collection module 420 is used to collect the electrical signal in the feedback module 410 and output the collection signal. The control module 430 is used to perform data detection according to the collection signal.

[0049] In this embodiment, the acquisition module 420 acquires the electrical signal in the feedback module 410 and sends the acquired signal to the control module 430. Since the excitation power supply includes a DC signal and an AC signal, the acquisition module 420 can acquire the DC signal and the AC signal respectively. The control module 430 can determine the working status of the VI source device by detecting the DC signal and the AC signal.

[0050] Specifically, the acquisition module 420 includes a DC acquisition unit and an AC acquisition unit. The DC acquisition unit is connected to the voltage feedback unit 411, the current feedback unit 412, and the control module 430. The DC acquisition unit can acquire the DC voltage output by the voltage feedback unit 411 and the DC current output by the current feedback unit 412. The AC acquisition unit is connected to the voltage feedback unit 411, the current feedback unit 412, and the control module 430. The AC acquisition unit can acquire the AC voltage output by the voltage feedback unit 411 and the AC current output by the current feedback unit 412. The control module 430 performs data detection according to the signal output by the DC acquisition unit and the signal output by the AC acquisition unit.

[0051] In this embodiment, the DC acquisition unit includes a first analog-to-digital converter, a second analog-to-digital converter, a first filter, and a second filter. The input end of the first filter is connected to the input end of the DC acquisition unit, the output end of the first filter is connected to the input end of the first analog-to-digital conversion unit, the output end of the first analog-to-digital conversion unit is connected to the output end of the DC acquisition module, the input end of the second filter is connected to the input end of the DC acquisition unit, the output end of the second filter is connected to the input end of the second analog-to-digital conversion unit, and the output end of the second analog-to-digital conversion unit is connected to the output end of the DC acquisition module. The first filter and the first analog-to-digital converter perform analog-to-digital conversion on the DC voltage signal after filtering, and send the converted digital signal to the control module 430. The second filter and the second analog-to-digital converter perform analog-to-digital conversion on the DC current signal after filtering, and send the converted digital signal to the control module 430.

[0052] The AC acquisition unit includes a third analog-to-digital converter, a first bias regulator and a first gain regulator, as well as a fourth analog-to-digital converter, a second bias regulator and a second gain regulator. The first bias regulator and the first gain regulator are connected to the control module 430, and the bias and gain can be adjusted according to the digital quantity corresponding to the DC voltage output by the first analog-to-digital converter, so that the adjusted gain and bias are equal to the DC voltage after adding, that is, the third analog-to-digital converter performs analog-to-digital conversion on the AC voltage signal and sends it to the control module 430. The second bias regulator and the second gain regulator are connected to the control module 430, and the bias and gain can be adjusted according to the digital quantity corresponding to the DC current output by the second analog-to-digital converter, so that the adjusted gain and bias are equal to the DC current after adding, that is, the fourth analog-to-digital converter performs analog-to-digital conversion on the AC current signal and sends it to the control module 430.

[0053] Continue to refer Figure 4The VI source device also includes a clamping module 440 and a signal selection module 450. The clamping module 440 is connected between the signal processing module 120 and the power amplification module 130. The signal selection module 450 is connected between the voltage feedback unit 411 and the signal processing module 120 and between the current feedback unit 412 and the signal processing module 120, and is connected to the clamping module 440 and the control module 430. The signal selection module 450 selects whether the voltage feedback unit 411 is turned on or the current feedback unit 412 is turned on according to the control signal output by the control module 430. The clamping module 440 clamps according to the signal in the feedback circuit selected by the signal selection module 450.

[0054] Exemplarily, the clamping module 440 includes an eighth operational amplifier U11, a ninth operational amplifier U12, a fourth power supply V4, a fifth power supply V5, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a sixth capacitor C6, a seventh capacitor C7, a first diode D1 and a second diode D2, and the signal selection module 450 includes a second switch S2 and a third switch S3, the first end of the second switch S2 is connected to the first end of the nineteenth resistor R19, the second end of the second switch S2 is connected to the voltage feedback unit 411, the third end of the second switch S2 is connected to the current feedback unit 412, the first end of the third switch S3 is connected to the clamping module 440, the second end of the third switch S3 is connected to the voltage feedback unit 411, and the third end of the third switch S3 is connected to the current feedback unit 412. The second switch S2 and the third switch S3 select the voltage feedback unit 411 to be turned on or the current feedback unit 412 to be turned on according to the control signal. When the voltage feedback unit 411 is turned on or the current feedback unit 412 is turned on, the clamping module 440 compares the feedback signal with the set parameter. When the feedback signal is greater than the set parameter, the second diode D2 is turned on, and when the feedback signal is less than the set parameter, the first diode D1 is turned on, so that the signal output by the signal processing module 120 is clamped to the preset value.

[0055] The VI source device provided in the embodiment of the present invention not only covers the application scenarios such as DC voltage and current output measurement of the traditional VI source by adding waveform generation (signal generation module 110) and sampling (acquisition module 420) functions, but is also more convenient for applications that require additional input waveforms. For example, when testing the PSRR (Power Supply Rejection Ratio) parameter, it is required to input a signal that fluctuates to the power supply pin of the tested switch, for example, the power-on waveform of the tested chip or module can be directly sampled. And provide a corresponding trigger waveform for the power monitoring or reset chip.

[0056] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0057] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A VI source device, characterized in that: It includes a signal generation module, a signal processing module and a power amplification module; The signal generating module is used to output a first AC signal; The signal processing module is connected to the signal generating module, and the signal processing module is used to perform error amplification and integration processing on the first AC signal; The power amplification module is connected to the signal processing module and the device under test. The power amplification module is used to generate a target AC signal after power amplifying the signal output by the signal processing module. The target AC signal is used to provide an excitation power supply for the device under test; wherein the target AC signal is an AC signal with a DC bias.

2. The VI source device according to claim 1, characterized in that: The signal generating module includes a waveform generating unit, a DC bias unit and an adder unit, the waveform generating unit is used to generate a second AC signal, the DC bias unit is used to generate a DC signal, the adder unit is connected to the waveform generating unit and the DC bias unit, and the adder unit is used to generate the first AC signal according to the second AC signal and the DC signal.

3. The VI source device according to claim 2, characterized in that: The DC bias unit includes a digital-to-analog conversion chip, a first resistor and a second resistor. The input end of the digital-to-analog conversion chip is connected to a first control signal, the first end of the first resistor is connected to a first output end of the digital-to-analog conversion chip, the second end of the first resistor is connected to an input end of the adder unit, the first end of the second resistor is connected to a second output end of the digital-to-analog conversion chip, and the second end of the second resistor is connected to an input end of the adder unit.

4. The VI source device according to claim 2, characterized in that: The adder unit includes a first adder, a solid-state relay, a third resistor, a fourth resistor, a fifth resistor and a first capacitor, wherein the negative input end of the first adder is connected to the input end of the adder unit, the first end of the third resistor, the first end of the fourth resistor and the first end of the first capacitor, the positive input end of the first adder is grounded, the output end of the first adder is connected to the second end of the third resistor, the second end of the first capacitor, the third end of the solid-state relay and the output end of the adder unit, the fourth end of the solid-state relay is connected to the second end of the fourth resistor, the first end of the solid-state relay is connected to the first end of the fifth resistor, the second end of the fifth resistor is connected to the second control signal, and the second end of the solid-state relay is grounded.

5. The VI source device according to claim 1, characterized in that: The signal processing module includes an error amplifying unit and an integrating unit. The error amplifying unit is connected in parallel with the integrating unit. The error amplifying unit is used to perform error amplification on the first AC signal. The integrating unit is used to perform integration processing on the first AC signal.

6. The VI source device according to claim 5, characterized in that: The error amplification unit includes a first operational amplifier and a sixth resistor, and the integration unit includes a seventh resistor, a second capacitor and a third capacitor; the negative input terminal of the first operational amplifier is connected to the first end of the sixth resistor, the first end of the seventh resistor and the first end of the second capacitor, the second end of the sixth resistor is connected to the input terminal of the signal processing module, the second end of the seventh resistor is connected to the first end of the third capacitor, the second end of the third capacitor is connected to the second end of the second capacitor, the output terminal of the first operational amplifier and the output terminal of the signal processing module, and the positive input terminal of the first operational amplifier is grounded.

7. The VI source device according to claim 1, characterized in that: It also includes a feedback module, which is connected between the input end of the device under test and the input end of the signal processing module, and is used to feed back the electrical signal input by the device under test to the signal processing module.

8. The VI source device according to claim 7, characterized in that: The feedback module includes a voltage feedback unit and a current feedback unit. The voltage feedback unit is connected between the input end of the device under test and the input end of the signal processing module, and is used to feed back the voltage signal in the excitation power supply; the current feedback unit is connected between the input end of the device under test and the input end of the signal processing module, and is used to feed back the current signal in the excitation power supply.

9. The VI source device according to claim 8, characterized in that: It also includes a collection module and a control module. The collection module is connected to the feedback module and the control module. The collection module is used to collect electrical signals in the feedback module and output collection signals. The control module is used to perform data detection according to the collection signals.

10. The VI source device according to claim 9, characterized in that: The acquisition module includes a DC acquisition unit and an AC acquisition unit, wherein the DC acquisition unit is connected to the voltage feedback unit, the current feedback unit and the control module, and is used to acquire the DC voltage output by the voltage feedback unit and the DC current output by the current feedback unit; the AC acquisition unit is connected to the voltage feedback unit, the current feedback unit and the control module, and is used to acquire the AC voltage output by the voltage feedback unit and the AC current output by the current feedback unit; and the control module is used to perform data detection according to the signal output by the DC acquisition unit and the signal output by the AC acquisition unit.

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