CN209928302U

CN209928302U - Voltage source

Info

Publication number: CN209928302U
Application number: CN201920325199.3U
Authority: CN
Inventors: 程帅
Original assignee: Hefei Native Quantum Computing Technology Co Ltd
Current assignee: Hefei Native Quantum Computing Technology Co Ltd
Priority date: 2019-03-14
Filing date: 2019-03-14
Publication date: 2020-01-10
Anticipated expiration: 2029-03-14

Abstract

The utility model discloses a voltage source relates to electron technical field, the utility model discloses the voltage source includes host system and DAC voltage output module, host system with DAC voltage output module passes through the opto-coupler and connects, host system transmits control signal to DAC voltage output module through the opto-coupler, the utility model provides a voltage source adopts above-mentioned technical scheme, makes host system with DAC voltage output module passes through opto-coupler transmission signal, has guaranteed signal transmission's quality to promote the reliability of circuit.

Description

Voltage source

Technical Field

The utility model belongs to the technical field of the electron, especially a voltage source.

Background

Testing quantum chips requires a stable and high precision voltage source.

With the development of high-precision circuitry, the requirements for the output precision of devices, such as the output step of digital-to-analog converters, are higher and higher, and if the high precision of the output is to be realized, the error sources (device error, noise and noise propagation, temperature drift) on the devices need to be strictly controlled.

The output accuracy of the voltage source is one of the important factors influencing the output accuracy of the device, the signal transmission noise in the current commonly used voltage source is very large, the output accuracy of the voltage source is adversely affected, and the reliability of the circuit is low.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a voltage source to solve not enough among the prior art, it can play the noise isolation effect to signal transmission, improves signal transmission's stability and the reliability of circuit.

The utility model adopts the technical scheme as follows:

a voltage source comprises a main control module and a DAC voltage output module, wherein the main control module is connected with the DAC voltage output module through an optical coupler, and the main control module transmits a control signal to the DAC voltage output module through the optical coupler.

Further, the DAC voltage output module comprises a reference voltage circuit, a first amplifying module, a second amplifying module and a DAC module;

the reference voltage circuit is used for outputting reference voltages to the first amplification module and the second amplification module according to input analog voltages;

the first amplifying module is configured to amplify the reference voltage to obtain a positive reference voltage, and output the positive reference voltage to a positive input end of the DAC module;

the second amplifying module is used for amplifying the reference voltage to obtain a negative reference voltage and outputting the negative reference voltage to the negative input end of the DAC module.

Further, the DAC voltage output module further includes a filter circuit;

the input end of the first amplification module and the input end of the second amplification module are respectively connected with the reference voltage circuit through the filter circuit.

Furthermore, the filter circuit is a pi-type wave circuit and an RC filter circuit which are connected in series;

the pi-type filter circuit comprises a first capacitor, a second capacitor and a first resistor;

the RC filter circuit comprises a second resistor and a third capacitor;

the reference voltage output by the output end of the reference voltage circuit passes through the first resistor and the second resistor which are connected in series and then is respectively connected with the non-inverting input ends of the first amplifying module and the second amplifying module, wherein: the one end that first resistance kept away from the second resistance is connected with the other end of first electric capacity, the other end ground connection of first electric capacity, first resistance with be connected with between the second resistance the other end of second electric capacity, the other end ground connection of second electric capacity, the one end that the second resistance kept away from first resistance is connected with the one end of third electric capacity, the other end ground connection of third electric capacity.

Further, the first amplification module comprises a first amplifier, a third resistor, a fourth resistor and a fourth capacitor;

wherein: the non-inverting input end of the first amplifier is connected to the output end of the reference voltage circuit through the filter circuit;

the inverting input end of the first amplifier is connected to the output end of the first amplifier through the third resistor and the fourth capacitor which are connected in parallel;

and the inverting input end of the first amplifier is grounded through a fourth resistor.

Further, the second amplifying module includes a second amplifier, a fifth resistor, a sixth resistor, a seventh resistor, and a fifth capacitor;

the non-inverting input end of the second amplifier is connected to the output end of the reference voltage circuit through the filter circuit;

the inverting input end of the second amplifier is connected to the output end of the second amplifier through a fifth resistor, a sixth resistor and a seventh resistor which are connected in series;

and the inverting input end of the second amplifier is connected to the output end of the second amplifier through the fifth capacitor.

Further, the DAC voltage output module further includes a first voltage regulator, a first dc feedback branch and a first ac feedback branch;

the first voltage stabilizer is used for outputting a positive analog voltage to the reference voltage circuit according to an input positive power supply voltage, a first direct current feedback voltage and a first alternating current feedback voltage;

the first direct-current feedback branch circuit is used for obtaining the first direct-current feedback voltage according to the direct-current component of the positive analog voltage and inputting the first direct-current feedback voltage to the first voltage stabilizer;

the first alternating current feedback branch circuit is used for obtaining the first alternating current feedback voltage according to the alternating current component of the positive analog voltage and inputting the first alternating current feedback voltage to the first voltage stabilizer.

Further, the DAC voltage output module further includes a second voltage regulator, a second dc feedback branch, and a second ac feedback branch;

the second voltage stabilizer is used for outputting a negative analog voltage to the reference voltage circuit according to the input negative power supply voltage, the second direct current feedback voltage and the second alternating current feedback voltage;

the second direct-current feedback branch circuit is used for obtaining a second direct-current feedback voltage according to the direct-current component of the negative analog voltage and inputting the second direct-current feedback voltage to the second voltage stabilizer;

and the second alternating current feedback branch is used for obtaining a second alternating current feedback voltage according to the alternating current component of the negative analog voltage and inputting the second alternating current feedback voltage to the second voltage stabilizer.

Further, the DAC voltage output module further includes: a virtual ground module;

the virtual ground module is used for ensuring the symmetry of the positive analog voltage and the negative analog voltage.

Further, the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor and the seventh resistor are all metal foil resistors.

Has the advantages that: compared with the prior art, the utility model discloses a set up host system and DAC module, and will host system with the DAC module passes through the opto-coupler and connects, makes host system passes through the opto-coupler with control signal and transmits to the DAC module, and the opto-coupler plays the isolation effect, has guaranteed analog signal's quality, also can promote the reliability of circuit simultaneously greatly.

Drawings

Fig. 1 is a schematic diagram of a voltage source structure according to an embodiment of the present invention;

fig. 2 is a schematic diagram of another voltage source structure provided by the embodiment of the present invention;

fig. 3 is a schematic diagram of another voltage source structure provided in the embodiment of the present invention;

fig. 4 is a circuit topology diagram of a DAC voltage output module in a voltage source according to an embodiment of the present invention;

fig. 5 is a circuit topology diagram of a DAC voltage output module in another voltage source according to an embodiment of the present invention;

fig. 6 is a circuit topology diagram of a DAC module in another voltage source according to an embodiment of the present invention.

Detailed Description

The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

Referring to fig. 1, an embodiment of the present invention provides a schematic structural diagram of a voltage source.

The voltage source, comprising: the system comprises a main control module 100, an optical coupler 200 and a DAC voltage output module 300; the main control module 100 and the DAC voltage output module 300 are connected through an optical coupler 200, and the main control module 100 transmits a control signal to the DAC voltage output module 300 through the optical coupler 200.

By adopting the technical scheme, the main control module 100 and the DAC voltage output module 300 transmit signals through the optical coupler 200, so that the quality of signal transmission is ensured, and the reliability of the circuit is improved.

An Optical Coupler (OCEP) is also called a photoelectric isolator or a photoelectric coupler, and is called an optocoupler for short. The photoelectric coupler takes light as a medium to transmit electric signals, takes light as a medium to couple input end signals to output ends, has the advantages of strong anti-interference capability, insulation between output and input, unidirectional signal transmission and the like, and is widely applied to digital circuits.

It should be noted that the main control module 100 may specifically include modules that can be set by a user independently, such as a main control chip, a slave control chip, a network interface chip, and a storage module, so as to respectively implement different functions required.

The following describes a specific structure of a voltage source provided by the embodiments of the present application.

Referring to fig. 2, a specific structural diagram of a voltage source provided in the embodiment of the present application is shown.

The voltage source comprises: the master control module 100, the optical coupler 200 and the DAC voltage output module 300, wherein the DAC voltage output module 300 includes a reference voltage circuit 301, a first amplification module 302, a second amplification module 303 and a DAC module 304.

The reference voltage circuit 301 is configured to output a reference voltage to the first amplifying module 302 and the second amplifying module 303 respectively according to an input analog voltage.

The first amplifying module 302 is configured to amplify the reference voltage to obtain a positive reference voltage, and output the positive reference voltage to a positive input end of the DAC module 304.

The second amplifying module 303 is configured to amplify the reference voltage to obtain a negative reference voltage, and output the negative reference voltage to the negative input end of the DAC module 304.

Specifically, in a specific application, the DAC module 304 needs a set of voltages with opposite polarities but equal amplitudes as the input of the reference voltage, for example, the DAC module needs a reference voltage of ± 10V, the reference voltage circuit 301 needs to output the input 13.5V analog voltage as a reference voltage of 5V, and the reference voltage of 5V is output as a reference voltage of +10V and-10V needed by the subsequent DAC module through the first amplification module 302 and the second amplification module 303, respectively.

Wherein: the reference voltage circuit 301 can select an ADR445 reference voltage source chip of ADI company, has ultra-low noise and meets the design requirement.

In this embodiment, a high-precision reference voltage circuit 301, a first amplification module 302, and a second amplification module 303 are adopted to provide a high-precision reference voltage input for a subsequent DAC module 304, so as to improve the precision of the system.

Further, referring to fig. 3, a specific structural diagram of a voltage source according to an embodiment of the present application is provided.

The DAC voltage output module 300 further includes a filter circuit 305, specifically, the filter circuit 305 is disposed at a rear stage of the reference voltage circuit 301, and is configured to filter the reference voltage output by the reference voltage circuit 301, so as to improve stability of reference voltage output.

Specifically, the filter circuit 305 includes a pi-type filter circuit and an RC filter circuit connected in series, and the output end of the reference voltage circuit 301 passes through the pi-type filter circuit and the RC filter circuit connected in series and then is connected to the first amplification module 302 and the second amplification module 303 respectively.

The filter circuit 305 filters the reference voltage output by the reference voltage circuit, so that the bandwidth can be limited to a very low degree, noise in the reference voltage can be filtered, the noise can be controlled to a very low level, the low noise of the reference voltage is ensured, and the high-precision system requirement can be met.

Further, referring to fig. 4, a specific structure of the DAC voltage output module is provided in this embodiment.

The pi-type filter circuit comprises a first capacitor C1, a second capacitor C2 and a first resistor R1;

the RC filter circuit comprises a second resistor R2 and a third capacitor R3;

the reference voltage output by the reference voltage circuit 301 passes through a first resistor R1 and a second resistor R2 and then is connected with the non-inverting input ends of the first amplification module 302 and the second amplification module 303 respectively, wherein one end of R1, which is far away from R2, is connected with one end of a first capacitor C1, the other end of the first capacitor C1 is grounded, one end of a second capacitor C2 is connected between the first resistor R1 and the second resistor R2, one end of the second capacitor C2 is grounded, one end of the second resistor R2, which is far away from the first resistor R1, is connected with one end of a third capacitor C3, and the other end of the third capacitor C3 is grounded.

Wherein: the first capacitor C1, the first resistor R1 and the second capacitor C2 form a pi-type filter circuit, and the second resistor R2 and the third capacitor C3 form an RC filter circuit.

The first resistor R1 and the second resistor R2 both adopt low-temperature-drift and high-precision metal foil resistors, and the resistance value is 1 k.

The first amplifying module 302 comprises a first amplifier 312, a third resistor R3, a fourth resistor R4 and a fourth capacitor C4;

wherein: the non-inverting input of the first amplifier 312 passes through the filter circuit 305 to the output of the reference voltage circuit 301; the inverting input terminal of the first amplifier 312 is connected to the output terminal of the first amplifier 312 through the third resistor R3 and the fourth capacitor C4 connected in parallel; the inverting input of the first amplifier 312 is also connected to ground through a fourth resistor R4.

The above components all adopt high-precision and low-temperature drift devices, and the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 all adopt low-temperature drift and high-precision metal foil resistors, and the resistance value is 1 k.

In practical applications, the 5V reference voltage input from the input terminal of the first amplifying module 302 can be output as a +10V reference voltage by using the above circuit configuration.

With continued reference to fig. 4, the second amplifying module 303 includes a second amplifier 313, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and a fifth capacitor C5;

the non-inverting input terminal of the second amplifier 313 is connected to the output terminal of the reference voltage circuit 301 through the filter circuit 305; the inverting input terminal of the second amplifier 313 is connected to the output terminal of the second amplifier 313 through a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7 which are connected in series; the inverting input terminal of the second amplifier 313 is further connected to the output terminal of the second amplifier 313 through the fifth capacitor C5.

It should be noted that the above components all adopt high-precision and low-temperature drift devices, the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7 all adopt low-temperature drift and high-precision metal foil resistors, the resistance value is 1k, and meanwhile, the first amplifier 312 and the second amplifier 313 can both adopt AD8676 chips of ADI corporation, so that the characteristics of ultrahigh precision performance are achieved, and the precision design requirement is met.

In practical applications, the 5V reference voltage inputted from the input terminal of the first amplifying module 302 can be outputted as a-10V reference voltage by using the above circuit configuration.

With the above technical solution, a high-precision, low-noise and low-drift reference voltage can be provided for the DAC module according to an input analog voltage, but since the precision of the analog voltage also affects the output precision of the reference voltage, the embodiment of the present application further provides a voltage source, which is different from the above embodiments in that, referring to fig. 5, the DAC voltage output module 300 further includes a first voltage regulator VR1, a first dc feedback branch DP1 and a first ac feedback branch AP 1;

a first voltage regulator VR1 for outputting a positive analog voltage to the reference voltage circuit 301 according to the input positive supply voltage Vsp +, the first dc feedback voltage Vd1 and the first ac feedback voltage Va 1;

the first direct current feedback branch DP1 is used for obtaining a first direct current feedback voltage Vd1 according to the direct current component of the positive analog voltage V +, and inputting the first direct current feedback voltage Vd1 to the first voltage regulator VR 1;

the first ac feedback branch AP1 is configured to obtain a first ac feedback voltage Va1 according to an ac component of the positive analog voltage V +, and input the first ac feedback voltage Va1 to the first voltage regulator VR 1.

The voltage stabilizer stabilizes the output voltage around a certain voltage value according to the feedback of the output of the voltage stabilizer, and the detailed working principle of the voltage stabilizer is not described herein. In the embodiment of the present application, the first voltage regulator VR1 uses the positive power supply voltage as an input source, and the first dc feedback voltage Vd1 and the first ac feedback voltage Va1 as feedback of the output to obtain a voltage-stabilized positive analog voltage. Since the direct current feedback (i.e., the first direct current feedback branch DP1) and the alternating current feedback (i.e., the first alternating current feedback branch AP1) are separated in the embodiment of the present application, mutual interference between the direct current and the alternating current is avoided, and higher output accuracy of the positive analog voltage and lower output noise are also ensured.

As an example, the first dc feedback branch DP1 may be a resistor or a plurality of resistors connected in series, in parallel, or in series-parallel, and the first ac feedback branch AP1 may be a capacitor or a plurality of capacitors connected in series, in parallel, or in series-parallel, which are not limited herein.

In a specific example, the positive power supply voltage may be +15V provided by other devices on the circuit board, and the output positive analog voltage may be set according to the actual input requirement of the reference voltage circuit, for example, the positive analog voltage V + may be an analog voltage of + 13.5V. In practice, the first voltage regulator VR1 may be a high Power Supply Rejection Ratio (PSRR) low noise voltage regulator of model number TPS7a4701 or TPS7a 3301.

In some possible designs, the positive analog voltage may also provide a high precision, low noise analog voltage supply to the powered side, such as in a DAC, for which the positive analog voltage V + may provide an analog voltage input of + 15V.

It should be noted that in some specific application scenarios, a device (i.e. a power receiving side) sometimes needs to use a set of analog voltage inputs with opposite polarities but equal magnitudes, for example, some DACs need to use an analog voltage of ± 13.5V, and the positive analog voltage V + output by the first voltage regulator VR1 can be provided to the power receiving side as a positive analog voltage thereof. In order to provide a negative analog voltage, in some possible implementations of the embodiments of the present application, with continued reference to fig. 5, the voltage source may further include: a second voltage regulator VR2, a second dc feedback branch DP2 and a second ac feedback branch AP 2.

A second voltage regulator VR2, configured to output a negative analog voltage to the reference voltage circuit 301 according to an input negative power supply voltage, a second dc feedback voltage Vd2, and a second ac feedback voltage Va 2; the positive and negative analog voltages are equal in magnitude but opposite in polarity.

The second dc feedback branch DP2 is configured to obtain a second dc feedback voltage Vd2 according to a dc component of the negative analog voltage, and input the second dc feedback voltage Vd2 to the second regulator VR 2.

And the second alternating current feedback branch AP2 is used for obtaining a second alternating current feedback voltage Va2 according to the alternating current component of the negative analog voltage, and inputting the second alternating current feedback voltage Va2 to the second voltage regulator VR 2.

Similar to the first voltage regulator VR1, the second voltage regulator VR2 may use the negative supply voltage as an input source, the second dc feedback voltage Vd2, and the second ac feedback voltage Va2 as feedback for output to obtain a voltage stabilized negative analog voltage. Due to the fact that the second direct current feedback branch DP2 is separated from the second alternating current feedback branch AP2, mutual interference of direct current and alternating current is avoided, and high output accuracy of negative analog voltage and low output noise are guaranteed.

As an example, the second dc feedback branch DP2 may be a resistor or a plurality of resistors connected in series, in parallel, or in series-parallel, and the second ac feedback branch AP2 may be a capacitor or a plurality of capacitors connected in series, in parallel, or in series-parallel, which are not limited herein.

In a specific example, the negative supply voltage Vsp-may be a voltage of-15V provided by other devices on the circuit board, and the output negative analog voltage may be set according to the actual input requirements of the devices, e.g., the negative analog voltage may be an analog voltage of-13.5V. In practice, the first and second voltage regulators VR1 and VR2 may be implemented as low noise, high power rejection ratio (PSRR) regulators LDO manufactured by texas instruments under model number TPS7a4701 or TPS7a 3301.

It should be noted that, in some possible designs, since the values of the resistors in the first dc feedback branch DP1 and the second dc feedback branch DP2 are different, the feedback error and the feedback drift are also different, which may cause the symmetry of the positive analog voltage and the negative analog voltage to change along with the operation of the device. Therefore, in order to ensure the symmetry of the positive analog voltage and the negative analog voltage, in some possible implementations of the embodiments of the present application, a virtual ground is introduced to ensure the symmetry of the output. Specifically, the voltage source may further include: a virtual ground module;

and the virtual ground module is used for ensuring the symmetry of the positive analog voltage and the negative analog voltage.

Further, the DAC module 304 includes a third amplifying module 314 and a DAC chip 324;

the following describes a specific application implementation of the voltage source provided in the embodiment of the present application with reference to a specific application scenario.

Referring to fig. 6, a specific application diagram of a specific voltage source provided in the embodiment of the present application is shown.

When the voltage source provided by the embodiment of the application is used for supplying power to a DAC chip 324 (for example, a single chip, 20-bit, voltage output digital-to-analog converter with the model number of AD 5791), the output positive reference voltage +10V and the output negative reference voltage-10V are respectively input to a positive reference voltage input pin VREFRF and a negative reference voltage input pin VREFNF of the DAC chip 324 through the third amplification module 314, and the output positive analog voltage +13.5V and the output negative analog voltage-13.5V are respectively input to a VDD pin and a VSS pin of the DAC chip. The positive reference voltage and the negative reference voltage provide high-precision, low-noise and low-drift working voltages for the DAC, and the output range of the DAC chip 324 is determined; the positive and negative analog voltages provide a high precision, low noise, low drift supply voltage for the DAC chip 324.

It should be noted that all the device models given herein are merely exemplary illustrations, and in practical applications, other device models may be selected according to specific needs to implement the voltage source provided in the embodiment of the present application, which is not limited in the embodiment of the present application and is not listed here.

It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The system or the device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application in any way. Although the present application has been described with reference to the preferred embodiments, it is not intended to limit the present application. Those skilled in the art can now make numerous possible variations and modifications to the disclosed embodiments, or modify equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the claimed embodiments. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application still fall within the protection scope of the technical solution of the present application without departing from the content of the technical solution of the present application.

Claims

1. The voltage source is characterized by comprising a main control module and a DAC voltage output module, wherein the main control module is connected with the DAC voltage output module through an optical coupler, and the main control module transmits a control signal to the DAC voltage output module through the optical coupler.

2. The voltage source of claim 1, wherein the DAC voltage output module comprises a reference voltage circuit, a first amplification module, a second amplification module, and a DAC module;

3. The voltage source of claim 2, wherein the DAC voltage output module further comprises a filter circuit;

4. The voltage source of claim 3, wherein the filter circuit is a pi-filter circuit and an RC-filter circuit in series;

the RC filter circuit comprises a second resistor and a third capacitor;

5. The voltage source of claim 4, wherein the first amplification module comprises a first amplifier, a third resistor, a fourth resistor, and a fourth capacitor;

6. The voltage source of claim 4, wherein the second amplification module comprises a second amplifier, a fifth resistor, a sixth resistor, a seventh resistor, and a fifth capacitor;

7. The voltage source of claim 6, wherein the DAC voltage output module further comprises a first voltage regulator, a first DC feedback branch, and a first AC feedback branch;

8. The voltage source of claim 7, wherein the DAC voltage output module further comprises a second voltage regulator, a second dc feedback branch, and a second ac feedback branch;

9. The voltage source of claim 8, wherein the DAC voltage output module further comprises: a virtual ground module;

10. The voltage source of claim 9, wherein the first, second, third, fourth, fifth, sixth, and seventh resistors are metal foil resistors.