Voltage output circuit and digital-to-analog conversion device

Abstract

The utility model discloses a voltage output circuit and a digital-to-analog conversion device, and the voltage output circuit comprises a first switch piece which comprises a first switch and a second switch, the first switch is coupled between a power supply end and a first pole plate of a first energy storage capacitor, and the second switch is coupled between a second pole plate of the first energy storage capacitor and a first grounding end; the second switch piece comprises a third switch and a fourth switch, the third switch is coupled between the second grounding end and the first pole plate of the first energy storage capacitor, and the fourth switch is coupled between the second pole plate of the first energy storage capacitor and the output end; the voltage output circuit is configured as follows: in a first state, the first switching element is switched on, and the first energy storage capacitor is coupled to the power supply end; in the second state, the second switching element is switched on, and the first energy storage capacitor is coupled to the output end. By utilizing the charging and discharging characteristics of the capacitor, when the charging state of the capacitor is switched to the discharging state, the current of the output end of the circuit can be absorbed to reduce the voltage, and interference signals are indirectly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of output voltage control, in particular to a voltage output circuit and a digital-to-analog conversion device. Background Art

[0002] In some voltage-driven devices, the device needs to be driven and controlled by the output voltage. At the same time, in some digital electronics and analog electronics fields, the control signal also depends on the output value of the voltage. The size of the output value of the control voltage can indirectly represent the signal transmitted between the transmitter and the receiver during the communication process. Therefore, in the voltage output circuit, the stability of the voltage is of great significance. In particular, compared with the traditional technology of using a single-line transmission control signal, the current method of using a two-line transmission voltage signal to represent the control signal can more accurately reflect the information carried by the signal.

[0003] However, in the prior art, the voltage output process is easily disturbed, resulting in voltage boost, and the output voltage value will be higher than the expected voltage value, which ultimately affects the operating efficiency. Utility Model Content

[0004] The purpose of the utility model is to provide a voltage output circuit, an operational amplifier and a digital-to-analog conversion device to solve the technical problem that when the power supply signal line in the prior art is disturbed and fluctuates during transmission, the terminal output voltage is too high, which affects the final operating efficiency of the equipment.

[0005] To achieve one of the purposes of the utility model, an embodiment of the utility model provides a voltage output circuit, the voltage output circuit includes a power supply end, an output end, a first ground end, a second ground end, a first energy storage capacitor, a first switch element and a second switch element; wherein: the first switch element includes a first switch and a second switch, the first switch is coupled between the power supply end and the first plate of the first energy storage capacitor, and the second switch is coupled between the second plate of the first energy storage capacitor and the first ground end; the second switch element includes a third switch and a fourth switch, the third switch is coupled between the second ground end and the first plate of the first energy storage capacitor, and the fourth switch is coupled between the second plate of the first energy storage capacitor and the output end; the voltage output circuit is configured as follows: in a first state, the first switch element is turned on, and the first energy storage capacitor is coupled to the power supply end and the first ground end; in a second state, the second switch element is turned on, and the first energy storage capacitor is coupled to the output end and the second ground end.

[0006] The utility model also provides a digital-to-analog conversion device, including an operational amplifier; the operational amplifier includes the voltage output circuit as described above, the operational amplifier has a first output terminal and a second output terminal, and two sets of output terminals of the voltage output circuit are respectively coupled to the first output terminal of the operational amplifier and the second output terminal of the operational amplifier.

[0007] Compared with the prior art, the utility model has the following beneficial effects: by utilizing the charging and discharging characteristics of the first energy storage capacitor, when the charging state of the first energy storage capacitor is switched to the discharging state, the current at the output end of the circuit can be absorbed, thereby reducing the output voltage and reducing the interference signal received by the circuit;

[0008] This solution can also be applied to a digital-to-analog conversion device, so that the common-mode signal in the output signal can be controlled to be reduced when the operational amplifier outputs, so as to achieve the purpose of reducing signal interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural diagram of a "H-bridge circuit" formed by a combination of multiple switches in one embodiment of the utility model.

[0010] Figure 2 This is a circuit structure diagram of an embodiment of the utility model in which the first energy storage capacitor and the second energy storage capacitor are connected using multiple switches.

[0011] Figure 3 It is a circuit connection structure diagram of an operational amplifier and a voltage output circuit in a digital-to-analog conversion device in one embodiment of the utility model. DETAILED DESCRIPTION

[0012] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0013] It should be noted that the term "comprises" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0014] like Figure 1As shown, in one embodiment of the utility model, a voltage output circuit is provided, and the voltage output circuit is configured with a first energy storage capacitor C1. Through the charging and discharging characteristics of the first energy storage capacitor C1, the output voltage of the circuit can be reduced when the charging state is switched to the discharging state, so as to solve the problem of high output voltage caused by interference or overload of the voltage output circuit in the prior art.

[0015] The voltage output circuit includes a power supply terminal, an output terminal, a first ground terminal, a second ground terminal, a first energy storage capacitor C1, a first switch element K1 and a second switch element K2; wherein:

[0016] The first switch element K1 includes a first switch K1-1 and a second switch K1-2, wherein the first switch K1-1 is coupled between the power supply end and the first plate of the first energy storage capacitor C1, and the second switch K1-2 is coupled between the second plate of the first energy storage capacitor C1 and the first ground end;

[0017] The second switch element K2 includes a third switch K2-1 and a fourth switch K2-2, the third switch K2-1 is coupled between the second ground terminal and the first plate of the first energy storage capacitor C1, and the fourth switch K2-2 is coupled between the second plate of the first energy storage capacitor C1 and the output terminal;

[0018] The voltage output circuit is configured as follows: in a first state, the first switch element K1 is turned on, and the first energy storage capacitor C1 is coupled to the power supply end and the first ground end; in a second state, the second switch element K2 is turned on, and the first energy storage capacitor C1 is coupled to the output end and the second ground end.

[0019] The power supply terminal and the first ground terminal are arranged on both sides of the first energy storage capacitor C1 , and the output terminal and the second ground terminal of the voltage output circuit are also located on both sides of the first energy storage capacitor C1 .

[0020] The voltage output circuit can control the on / off of the power supply terminal and the first ground terminal through the coupling of the first switch element K1; at the same time, the voltage output circuit can control the on / off of the output terminal and the second ground terminal through the coupling of the second switch element K2.

[0021] The voltage output circuit can enter a first state when the first switch K1 is turned on, and the first state is characterized by the power supply end charging the first energy storage capacitor C1, so that the first energy storage capacitor C1 stores energy; when the second switch K2 is turned on, the circuit enters a second state from the first state, and the second state is characterized by the first energy storage capacitor C1 discharging to the second ground end; when the first energy storage capacitor C1 is switched from the first state to the second state, the voltage on one side of the first energy storage capacitor C1 coupled to the output end of the voltage output circuit cannot change suddenly and decreases, thereby absorbing current from the output end of the voltage output circuit to reduce the output voltage of the output end of the voltage output circuit, thereby avoiding the situation where the voltage output circuit generates a voltage increase due to external or self influence.

[0022] It should be noted that the power supply end is the output voltage of the voltage output circuit. At the same time, the power supply end can also store energy for the first energy storage capacitor C1. The power supply end for storing energy in the first energy storage capacitor C1 can be the same power supply end as the power supply end of the voltage output circuit; however, in some other embodiments, the power supply ends of the two can also be set independently.

[0023] It should also be noted that the absorption current is characterized by the current output by the voltage output circuit being shunted to the first energy storage capacitor C1 so as to reduce the current output by the output end of the circuit.

[0024] In an implementation manner of the present invention, in a first state, the first plate of the first energy storage capacitor C1 is coupled to the power supply end and the second plate of the first energy storage capacitor C1 is coupled to the first ground end.

[0025] In the second state, the first plate of the first energy storage capacitor C1 is coupled to the second ground terminal and the second plate of the first energy storage capacitor C1 is coupled to the output terminal of the voltage output circuit.

[0026] In this way, based on the potential switching of the plates on both sides of the first energy storage capacitor C1, the charging and discharging states of the first energy storage capacitor C1 are switched, and the non-mutational property of the first energy storage capacitor C1 when switching from charging to discharging is utilized to absorb current at the output end of the voltage output circuit, thereby achieving voltage reduction.

[0027] For example: in the first state, when the first switch K1 is turned on, the first plate of the first energy storage capacitor C1 is coupled to the power supply end and the second plate of the first energy storage capacitor C1 is coupled to the first ground end; wherein, the power supply end represents a high level, and the first ground end can represent a low level, that is, the second plate voltage of the first energy storage capacitor C1 is lower than the first plate voltage of the first energy storage capacitor C1.

[0028] In the second state, the first plate of the first energy storage capacitor C1 is coupled to the second ground terminal and the second plate of the first energy storage capacitor C1 is coupled to the output terminal of the voltage output circuit; wherein the output terminal of the voltage output circuit outputs a voltage to the second plate, the output voltage represents a high level, and the second ground terminal can represent a low level, that is, at this time, the first plate voltage of the first energy storage capacitor C1 is lower than the second plate voltage of the first energy storage capacitor C1.

[0029] The high and low levels at both sides of the first energy storage capacitor C1 form a potential difference between the first energy storage capacitor C1 . Based on the potential difference, the first energy storage capacitor C1 can be charged in the first state and discharged in the second state.

[0030] In one embodiment of the utility model, when the voltage output circuit is in a first state, the first switch element K1 is turned on and the second switch element K2 is turned off; when the voltage output circuit is in a second state, the first switch element K1 is turned off and the second switch element K2 is turned on.

[0031] In this way, the first energy storage capacitor C1 always keeps only one branch turned on through the opposite control states of the first switch K1 and the second switch K2, thereby saving the control energy consumption of the second switch K2 when the first switch K1 is turned on, and saving the control energy consumption of the first switch K1 when the second switch K2 is turned on; at the same time, it also avoids the interference of other signals on the two side plates of the first energy storage capacitor C1 during the switching process.

[0032] It should be noted that the magnitude of the current at the output end of the voltage extraction output circuit depends on the capacitance of the first energy storage capacitor C1 , and technicians can adjust the capacitance of the first energy storage capacitor C1 according to the high value of the actual voltage.

[0033] Furthermore, the first energy storage capacitor C1 does not refer to a specific capacitor. In other embodiments, the first energy storage capacitor C1 may also be a capacitor set formed by connecting multiple capacitors in parallel. The total capacitance of the capacitor set depends on the degree of voltage increase when the voltage output circuit is disturbed.

[0034] Specifically, the capacitor set is formed by connecting multiple capacitors in parallel. The multiple capacitors can have the same capacity or different capacities. The first plates of the multiple capacitors are all coupled to the power supply end, and the second plates of the multiple capacitors are all coupled to the first ground end, thereby forming a first branch; similarly, the second plates of the multiple capacitors are also coupled to the output end of the circuit, and the first plates of the multiple capacitors are also coupled to the second ground end, thereby forming a second branch; the first branch is controlled to be turned on or off by the first switch K1, and the second branch is controlled to be turned on or off by the second switch K2.

[0035] The voltage output circuit controls the state of the first energy storage capacitor C1 through the first switch element K1 and the second switch element K2, thereby controlling the state of the voltage output circuit. In this way, when the voltage value output by the voltage output circuit is too high, the output voltage can be timely controlled to be lowered to ensure the stability of the output voltage.

[0036] In an implementation manner of the present utility model, the voltage output circuit switches alternately between a first state and a second state.

[0037] Specifically, during the operation of the voltage output circuit, it continuously switches alternately between the first state and the second state; that is, the first energy storage capacitor C1 continuously switches between the charging and discharging states, so that the voltage output circuit absorbs current for a long time during the voltage output process to maintain the continuous stability of the output voltage of the voltage output circuit.

[0038] For example, a time period is preset, and the voltage output circuit continuously outputs voltage during the preset time period, and the voltage output circuit continues to output a relatively high voltage due to signal interference during the preset time period; the first switch element K1 and the second switch element K2 are alternately turned on according to a preset frequency during the preset time period, so that the voltage output circuit absorbs current at a preset frequency during the preset time period to reduce the voltage.

[0039] It should be noted that the frequency of the current absorbed by the first energy storage capacitor C1 to the voltage output circuit during the preset time period can be consistent with the frequency of the voltage output, and therefore, consistent with the frequency of the interference signal output, so that the interference signal can be effectively filtered out.

[0040] The first branch and the second branch mentioned above can be branches that change dynamically based on the on / off state of the first switch K1 and the second switch K2 thereon. For example, in the above embodiment, the first branch is formed by the first switch K1 turning on the power supply terminal, the first energy storage capacitor C1, and the first ground terminal, and the second branch is formed by the second switch K2 turning on the second ground terminal, the first energy storage capacitor C1, and the output terminal of the voltage output circuit. The first branch and the second branch can also be branches that are fixed based on the circuit connection relationship. For example, the first switch K1 and the second switch K2 are on both sides of the first energy storage capacitor C1 to form an "H-bridge circuit".

[0041] The voltage output circuit controls the connection objects of the two plates of the first energy storage capacitor C1 respectively through two switches (the first switch K1-1 and the second switch K1-2), thereby turning on the first branch; and the voltage output circuit also controls the connection objects of the two plates of the first energy storage capacitor C1 respectively through two switches (the third switch K2-1 and the fourth switch K2-2), thereby turning on the second branch. In this way, four switches (the first switch K1-1 and the second switch K1-2 and the third switch K2-1 and the fourth switch K2-2) are used to form an "H-bridge circuit" based on the first energy storage capacitor C1, and the connection objects of the plates on both sides of the first energy storage capacitor C1 can be controlled separately. On the one hand, interference between the first branch and the second branch can be prevented, thereby preventing current series connection caused by misoperation; on the other hand, the phenomenon of short circuit of one-side plate of the first energy storage capacitor C1 due to untimely operation can be prevented, thereby avoiding damage to the overall circuit.

[0042] In one embodiment of the present invention, the first plate of the first energy storage capacitor C1 is coupled to the power supply end through the first switch K1 - 1 , and the second plate of the first energy storage capacitor C1 is coupled to the first ground end through the second switch K1 - 2 .

[0043] In one embodiment of the utility model, in the second state, the first plate of the first energy storage capacitor C1 is coupled to the second ground terminal through the third switch K2-1, and the second plate of the first energy storage capacitor C1 is coupled to the output terminal of the voltage output circuit through the fourth switch K2-2.

[0044] like Figure 2 As shown, in one embodiment of the present utility model, the voltage output circuit further includes a third ground terminal, a fourth ground terminal, a second energy storage capacitor C2, a third switch element K3 and a fourth switch element K4;

[0045] The third switch element K3 includes a fifth switch K3-1 and a sixth switch K3-2, the fifth switch K3-1 is coupled between the power supply terminal and the first plate of the second energy storage capacitor C2, and the sixth switch K3-2 is coupled between the third ground terminal and the second plate of the second energy storage capacitor C2;

[0046] The fourth switch element K4 includes a seventh switch K4-1 and an eighth switch K4-2, wherein the seventh switch K4-1 is coupled between the fourth ground terminal and the first plate of the second energy storage capacitor C2, and the eighth switch K4-2 is coupled between the output terminal and the second plate of the second energy storage capacitor C2;

[0047] The voltage output circuit is configured as follows: in a first state, the third switch element K3 is turned on, and the second energy storage capacitor C2 is coupled to the power supply end and the third ground end; in a second state, the fourth switch element K4 is turned on, and the second energy storage capacitor C2 is coupled to the output end of the voltage output circuit and the fourth ground end.

[0048] Among them, the conduction principle of the third switch element K3 and the fourth switch element K4 is the same as the conduction principle of the first switch element K1 and the second switch element K2 in the above-mentioned embodiment, and the way in which the second energy storage capacitor C2 is coupled to the third switch element K3 and the fourth switch element K4 is the same as the way in which the first energy storage capacitor C1 is coupled to the first switch element K1 and the second switch element K2, and the second energy storage capacitor C2 has the same effect as the first energy storage capacitor C1, which will not be repeated here.

[0049] In this way, the voltage output circuit can also absorb current at the output end of the voltage output circuit through the second energy storage capacitor C2, the third switch element K3 and the fourth switch element K4, thereby reducing the output voltage.

[0050] In particular, in one embodiment, the third branch and the fourth branch formed by the second energy storage capacitor C2, the third switch K3 and the fourth switch K4 are staggered with the first branch and the second branch formed by the first energy storage capacitor C1, the first switch K1 and the second switch K2 to absorb current; for example, when the first switch K1 is turned on and the second switch K2 is turned off to charge the first energy storage capacitor C1, the fourth switch K4 is turned on and the third switch K3 is turned off to discharge the second energy storage capacitor C2, and the second energy storage capacitor C2 absorbs the current at the output end of the voltage output circuit when switching to discharge to achieve voltage reduction; and when the first switch K1 is turned off and the second switch K2 is turned on so that the first energy storage capacitor C1 switches to discharge to absorb the current at the output end of the voltage output circuit, the third switch K3 is turned on and the fourth switch K4 is turned off to charge the second energy storage capacitor C2.

[0051] Thus, according to the above embodiment, the first energy storage capacitor C1 and the second energy storage capacitor C2 alternately absorb the current at the output end of the voltage output circuit to continuously keep the output voltage continuously reduced at a preset value for powering the device or reading voltage information.

[0052] In the first state of the voltage output circuit, the first plate of the first energy storage capacitor C1 is coupled to the power supply end through the first switch K1-1, and the second plate of the first energy storage capacitor C1 is coupled to the first ground end through the second switch K1-2; and the second plate of the second energy storage capacitor C2 is coupled to the output end of the voltage output circuit through the eighth switch K4-2, and the first plate of the second energy storage capacitor C2 is coupled to the third ground end through the seventh switch K4-1;

[0053] When the voltage output circuit is in the second state, the first plate of the first energy storage capacitor C1 is coupled to the second ground terminal through the third switch K2-1, and the second plate of the first energy storage capacitor C1 is coupled to the output terminal of the voltage output circuit through the fourth switch K2-2; and the first plate of the second energy storage capacitor C2 is coupled to the power supply terminal through the fifth switch K3-1, and the second plate of the second energy storage capacitor C2 is coupled to the fourth ground terminal through the sixth switch K3-2.

[0054] Based on the above implementation example, at the first moment, the first switch K1-1 and the second switch K1-2 are turned on, and the third switch K2-1 and the fourth switch K2-2 are turned off. At this time, a potential difference is formed between the two plates of the first energy storage capacitor C1, so that it is charged through the power supply end; at the same time, the seventh switch K4-1 and the eighth switch K4-2 are turned on, and the fifth switch K3-1 and the sixth switch K3-2 are turned off. At this time, the second energy storage capacitor C2 switches from the charging state to the discharging state, and the second plate of the second energy storage capacitor C2 is instantly reduced in voltage, so that the second energy storage capacitor C2 absorbs current from the output end of the voltage output circuit. At the second moment, the first switch K1-1 and the second switch K1-2 are turned off, and the third switch K2-1 and the fourth switch K2-2 are turned on. At this time, the first energy storage capacitor C1 is switched from the charging state at the first moment to the discharging state, and the second plate of the first energy storage capacitor C1 is instantly reduced in voltage so that the first energy storage capacitor C1 absorbs current from the output end of the voltage output circuit; at the same time, at the second moment, the seventh switch K4-1 and the eighth switch K4-2 are turned off, and the fifth switch K3-1 and the sixth switch K3-2 are turned on. At this time, a potential difference is formed between the two plates of the second energy storage capacitor C2, so that it is charged through the power supply end.

[0055] In all the above embodiments, the first switch K1-1, the second switch K1-2, the third switch K2-1, the fourth switch K2-2, the fifth switch K3-1, the sixth switch K3-2, the seventh switch K4-1 and the eighth switch K4-2 may be triodes or field effect transistors. The triodes or the field effect transistors are turned on or off by the control signal, and the first branch and the second branch may be turned on or off more quickly and effectively, thereby realizing rapid control.

[0056] In summary, the utility model provides a voltage output circuit, which adopts a first energy storage capacitor C1 and absorbs current based on the charging and discharging characteristics of the first energy storage capacitor C1. Specifically, the first energy storage capacitor C1 is connected to the power supply end through the first switch element K1 for charging and is connected to the output end of the voltage output circuit through the second switch element K2 after charging to discharge to the ground, and absorbs current at the switching moment; in this way, the first switch element K1 and the second switch element K2 are alternately turned on to achieve intermittent current absorption.

[0057] The utility model further provides a second energy storage capacitor C2, which is configured into the same circuit structure as the first energy storage capacitor C1 through the third switch element K3 and the fourth switch element K4, so as to also achieve interval current absorption; in this way, the first energy storage capacitor C1 and the second energy storage capacitor C2 are used to alternately absorb current, so as to achieve continuous voltage reduction of the output voltage during the continuous voltage output process of the circuit.

[0058] like Figure 3 As shown, in one embodiment of the present utility model, a digital-to-analog conversion device is also provided, and the digital-to-analog conversion device includes an operational amplifier A, and the operational amplifier A includes the voltage output circuit described in any of the above embodiments.

[0059] The operational amplifier A is used to amplify and output the signal input into the digital-to-analog conversion device.

[0060] The operational amplifier A includes a first output terminal Vp and a second output terminal Vn. In an exemplary embodiment, the operational amplifier A is a differential amplifier. The differential amplifier is used in the digital-to-analog conversion device to output and amplify the differential signal so as to output the information carried by the differential signal.

[0061] Furthermore, the output terminals of the two groups of the voltage output circuits are coupled to the first output terminal Vp of the operational amplifier A and the second output terminal Vn of the operational amplifier A, respectively.

[0062] In this way, the voltage output circuit can adjust the differential signal output by the differential amplifier, reduce signal interference by lowering the output voltage, that is, suppress the common-mode signal, and then shield the interference signal received by the differential amplifier, thereby improving the purity of the output differential signal and obtaining effective information.

[0063] Based on the setting of two groups of voltage output circuits, the voltages output by the first output terminal Vp and the second output terminal Vn of the operational amplifier A can be reduced respectively; by setting the capacitance values ​​of the first energy storage capacitor C1 and the second energy storage capacitor C2, the voltage reduction amount of the two output terminals of the operational amplifier A can be controlled to achieve the first output terminal Vp and the second output terminal Vn synchronously reducing the voltages of the same amplitude or synchronously reducing the voltages of different amplitudes according to different interference signals received.

[0064] In one embodiment of the present invention, the digital-to-analog conversion device further includes a filter M, and an input end of the filter M is coupled to the output end of the operational amplifier A.

[0065] The filter M can filter out the jitter in the time domain during the charging and discharging process of the first energy storage capacitor C1 and the second energy storage capacitor C2 in the voltage output circuit, thereby making the output voltage signal smoother and further improving the precision and accuracy of the information.

[0066] In summary, a digital-to-analog conversion device provided by the utility model includes an operational amplifier A, which adopts at least two groups of voltage output circuits provided above. The operational amplifier A is preferably a differential amplifier. The operational amplifier A has a first output terminal Vp and a second output terminal Vn. Each operational amplifier A corresponds to two groups of voltage output circuits, and the output ends of the corresponding two groups of voltage output circuits are respectively coupled to the first output terminal Vp and the second output terminal Vn. In this way, the voltage output circuit can be used to reduce the voltage output at the first output terminal Vp and the second output terminal Vn of the operational amplifier A respectively, thereby filtering the interference common-mode information in the operational amplifier A.

[0067] In particular, the digital-to-analog conversion device provided by the utility model plays an important role in reproducing digital signals in the analog domain when the multi-bit current steering is located in the field of digital signal processing for digital-to-analog conversion output. Specifically, during the transmission of the multi-bit current steering, two sets of voltage output circuits are used to control and reduce the multi-bit current steering in the two transmission lines, reduce the multi-bit current steering of the differential signal output, and indirectly reduce the output of the common-mode signal, so as to solve the technical problem that the output common-mode voltage is limited by the maximum output differential voltage and cannot be freely controlled.

[0068] Finally, in the process of controlling the common-mode signal output, the output offset introduced by the differential output is small, the linearity problem caused by the current source changing with the output voltage is avoided, and no additional harmonics are introduced.

[0069] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0070] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the utility model. They are not intended to limit the protection scope of the utility model. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A voltage output circuit, characterized in that: The voltage output circuit includes a power supply terminal, an output terminal, a first ground terminal, a second ground terminal, a first energy storage capacitor, a first switch element and a second switch element; wherein: The first switch element includes a first switch and a second switch, the first switch is coupled between the power supply end and the first plate of the first energy storage capacitor, and the second switch is coupled between the second plate of the first energy storage capacitor and the first ground end; The second switch element includes a third switch and a fourth switch, the third switch is coupled between the second ground terminal and the first plate of the first energy storage capacitor, and the fourth switch is coupled between the second plate of the first energy storage capacitor and the output terminal; The voltage output circuit is configured as follows: in a first state, the first switch is turned on, and the first energy storage capacitor is coupled to the power supply end and the first ground end; in a second state, the second switch is turned on, and the first energy storage capacitor is coupled to the output end and the second ground end.

2. The voltage output circuit according to claim 1, wherein in a first state, the first plate of the first energy storage capacitor is coupled to the power supply terminal and the second plate of the first energy storage capacitor is coupled to the first ground terminal; In the second state, the first plate of the first energy storage capacitor is coupled to the second ground terminal and the second plate of the first energy storage capacitor is coupled to the output terminal of the voltage output circuit.

3. The voltage output circuit according to claim 1, wherein in a first state of the voltage output circuit, the first switch element is turned on and the second switch element is turned off; in a second state of the voltage output circuit, the first switch element is turned off and the second switch element is turned on. 4 . The voltage output circuit according to claim 3 , wherein the voltage output circuit switches alternately between a first state and a second state.

5. The voltage output circuit according to claim 1, wherein in the first state, the first plate of the first energy storage capacitor is coupled to the power supply terminal through the first switch, and the second plate of the first energy storage capacitor is coupled to the first ground terminal through the second switch.

6. The voltage output circuit according to claim 1, wherein in the second state, the first plate of the first energy storage capacitor is coupled to the second ground terminal through the third switch, and the second plate of the first energy storage capacitor is coupled to the output terminal of the voltage output circuit through the fourth switch.

7. The voltage output circuit according to claim 1, wherein the voltage output circuit further comprises a third ground terminal, a fourth ground terminal, a second energy storage capacitor, a third switch element and a fourth switch element; wherein: The third switch element includes a fifth switch and a sixth switch, wherein the fifth switch is coupled between the power supply terminal and the first plate of the second energy storage capacitor, and the sixth switch is coupled between the second plate of the second energy storage capacitor and the third ground terminal; The fourth switch element includes a seventh switch and an eighth switch, the seventh switch is coupled between the fourth ground terminal and the first plate of the second energy storage circuit, and the eighth switch is coupled between the output terminal and the second plate of the second energy storage circuit; The voltage output circuit is configured as follows: in a first state, the third switch is turned on, and the second energy storage capacitor is coupled to the power supply terminal and the third ground terminal; in a second state, the fourth switch is turned on, and the second energy storage capacitor is coupled to the output terminal and the fourth ground terminal.

8. The voltage output circuit according to claim 7, wherein in the first state of the voltage output circuit, the first plate of the first energy storage capacitor is coupled to the power supply terminal through the first switch, and the second plate of the first energy storage capacitor is coupled to the first ground terminal through the second switch; and the second plate of the second energy storage capacitor is coupled to the output terminal through the eighth switch, and the first plate of the second energy storage capacitor is coupled to the fourth ground terminal through the seventh switch; When the voltage output circuit is in the second state, the first plate of the first energy storage capacitor is coupled to the second ground terminal through the third switch, and the second plate of the first energy storage capacitor is coupled to the output terminal through the fourth switch; and the first plate of the second energy storage capacitor is coupled to the power supply terminal through the fifth switch, and the second plate of the second energy storage capacitor is coupled to the third ground terminal through the sixth switch.

9. A digital-to-analog conversion device, comprising an operational amplifier, characterized in that: The operational amplifier comprises a voltage output circuit as described in any one of claims 1-8, the operational amplifier having a first output terminal and a second output terminal, and two groups of output terminals of the voltage output circuit are respectively coupled to the first output terminal of the operational amplifier and the second output terminal of the operational amplifier. 10 . The digital-to-analog conversion device according to claim 9 , wherein the digital-to-analog conversion device further comprises a filter, an input terminal of the filter being coupled to an output terminal of the operational amplifier.

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