CN114489229A - Drift voltage correction circuit, integrated circuit, measuring device, and electronic apparatus - Google Patents
Drift voltage correction circuit, integrated circuit, measuring device, and electronic apparatus Download PDFInfo
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- CN114489229A CN114489229A CN202111601508.3A CN202111601508A CN114489229A CN 114489229 A CN114489229 A CN 114489229A CN 202111601508 A CN202111601508 A CN 202111601508A CN 114489229 A CN114489229 A CN 114489229A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
- G05F3/02—Regulating voltage or current
- G05F3/08—Regulating voltage or current wherein the variable is dc
- G05F3/10—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics
- G05F3/16—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices
- G05F3/20—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations
- G05F3/26—Current mirrors
- G05F3/262—Current mirrors using field-effect transistors only
Abstract
The application provides a drift voltage correction circuit, an integrated circuit, a measuring device and an electronic device. The instrument amplifier comprises a first input end, a second input end, a third input end and a fourth input end; the first end of the high-order correction circuit is connected with the first input end of the instrumentation amplifier and is used for inputting a first voltage to the first input end of the instrumentation amplifier; the second end of the high-order correction circuit is connected with the second input end of the instrumentation amplifier and is used for inputting a second voltage to the second input end of the instrumentation amplifier; the instrumentation amplifier is configured to correct a drift voltage between the third input terminal and the fourth input terminal based on the first voltage and the second voltage. By adopting the circuit, the drift voltage input into the instrumentation amplifier can be calibrated.
Description
Technical Field
The present application relates to the field of electronic technology, and in particular, to a drift voltage correction circuit, an integrated circuit, a measurement device, and an electronic apparatus.
Background
At present, signals generated by sensors for outputting small signals and bioelectricity signals, such as pressure sensors and temperature sensors, are generally processed by a signal acquisition system, and the signal acquisition system can be generally used for processing digital signals.
Instrumentation amplifiers are the key modular circuits often used for small signal processing. However, when the input signal of the instrumentation amplifier contains a drift voltage, the instrumentation amplifier amplifies the voltage, which results in a reduction in the output dynamic range of the instrumentation amplifier, and even causes the instrumentation amplifier to fail to operate properly, thereby affecting the performance of the instrumentation amplifier.
Disclosure of Invention
In view of the above problems, the present application provides a drift voltage correction circuit, an integrated circuit, a measurement device, and an electronic apparatus, which can calibrate a drift voltage input to an instrumentation amplifier.
The embodiment of the application is realized by adopting the following technical scheme:
a drift voltage correction circuit comprising an instrumentation amplifier and a high-order correction circuit; the instrumentation amplifier comprises a first input end, a second input end, a third input end and a fourth input end; the first end of the high-order correction circuit is connected with the first input end of the instrumentation amplifier and is used for inputting a first voltage to the first input end of the instrumentation amplifier; the second end of the high-order correction circuit is connected with the second input end of the instrumentation amplifier and is used for inputting a second voltage to the second input end of the instrumentation amplifier; the instrumentation amplifier is configured to correct a drift voltage between the third input and the fourth input based on the first voltage and the second voltage.
Optionally, the high-order correction circuit includes a voltage division module and a first multiplexer, and the voltage division module has a plurality of voltage division nodes; the first multiplexer comprises a first output end, a second output end and a plurality of input ends; each voltage division node is respectively connected with one input end of the first multiplexer, the first output end of the first multiplexer is connected with the first input end of the instrumentation amplifier, and the second output end of the first multiplexer is connected with the second input end of the instrumentation amplifier; the first multiplexer is configured to select two voltage division nodes, and output voltages of the two voltage division nodes through the first output terminal and the second output terminal of the first multiplexer, respectively.
Optionally, one end of the voltage division module is used for connecting to a first power voltage, and the other end of the voltage division module is grounded, the voltage division module includes a plurality of voltage division resistors connected in series, and the plurality of voltage division nodes include every two adjacent connection nodes between the voltage division resistors.
Optionally, the instrumentation amplifier comprises a first amplifier, a second amplifier, and a feedback circuit;
the first in-phase input end of the first amplifier is the third input end of the instrumentation amplifier, the second in-phase input end of the first amplifier is the first input end of the instrumentation amplifier, and the inverting input end of the first amplifier is connected with the output end of the first amplifier through the feedback circuit; the first in-phase input end of the second amplifier is the fourth input end of the instrumentation amplifier, the second in-phase input end of the second amplifier is the second input end of the instrumentation amplifier, and the inverting input end of the second amplifier is connected with the output end of the second amplifier through the feedback circuit.
Optionally, the feedback circuit comprises a first feedback node and a second feedback node; the drift voltage correction circuit further includes: a low level correction circuit having a first terminal connected to the first feedback node and a second terminal connected to the second feedback node, the low level correction circuit being configured to output a first correction current to the first feedback node and a second correction current to the second feedback node.
Optionally, the low correction circuit includes: the current generation circuit comprises a current generation circuit, a first current mirror circuit and a second current mirror circuit; the input end of the current generating circuit is used for accessing a second power supply voltage and generating a first input current according to the second power supply voltage; the input end of the first current mirror circuit is connected to the output end of the current generation circuit, the first current mirror circuit is used for respectively generating a second input current and a first correction current according to the first input current in a mirror image mode, the first current mirror circuit comprises a first output end and a second output end, the first output end is used for outputting the second input current, and the second output end is used for outputting the first correction current; the input end of the second current mirror circuit is connected to the first output end of the first current mirror circuit and used for generating the second correction current according to the second input current mirror image; wherein the first correction current is in an opposite direction to the second correction current.
Optionally, the first current mirror circuit includes a plurality of first current output branches and a plurality of first switch branches, where the plurality of first switch branches are connected to the plurality of first current output branches in a one-to-one correspondence; the second current mirror circuit comprises a plurality of second current output branches and a plurality of second switch branches, wherein the plurality of second switch branches are connected with the plurality of second current output branches in a one-to-one correspondence manner; the low-order correction circuit further comprises a second multiplexer, wherein the second multiplexer is used for gating at least one first switching branch and at least one second switching branch, summing the current of the gated at least one first switching branch into the first correction current and outputting the first correction current, and summing the current of the gated at least one second switching branch into the second correction current and outputting the second correction current.
The embodiment of the application further provides an integrated circuit, and the integrated circuit is provided with the drift voltage correction circuit.
The embodiment of the application also provides a measuring device, the measuring device comprises a sensor and the integrated circuit, and the sensor is connected with the integrated circuit.
The embodiment of the application also provides electronic equipment, the electronic equipment comprises an equipment body and the measuring device, and the measuring device is arranged on the equipment body.
Compared with the prior art, the drift voltage correction circuit, the integrated circuit, the measuring device and the electronic equipment provided by the embodiment of the application comprise an instrumentation amplifier and a high-order correction circuit. The instrument amplifier comprises a first input end, a second input end, a third input end and a fourth input end; the first end of the high-order correction circuit is connected with the first input end of the instrumentation amplifier and is used for inputting a first voltage to the first input end of the instrumentation amplifier; the second end of the high-order correction circuit is connected with the second input end of the instrumentation amplifier and is used for inputting a second voltage to the second input end of the instrumentation amplifier; the instrumentation amplifier is configured to correct a drift voltage between the third input terminal and the fourth input terminal based on the first voltage and the second voltage. So that the drift voltage of the instrumentation amplifier can be input for calibration.
These and other aspects of the present application will be more readily apparent from the following description of the embodiments.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 shows a block diagram of a drift voltage correction circuit according to an embodiment of the present application.
Fig. 2 shows a schematic circuit diagram of a drift voltage correction circuit according to another embodiment of the present application.
Fig. 3 shows a schematic diagram of a high-order correction circuit according to an embodiment of the present disclosure.
Fig. 4 shows another schematic diagram of a drift voltage correction circuit according to another embodiment of the present application.
Fig. 5 shows a schematic circuit diagram of a low-order correction circuit provided in an embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present application and are not to be construed as limiting the present application.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 1, fig. 1 schematically illustrates a drift voltage correction circuit 100 provided by an embodiment of the present application, which includes a high-order correction circuit 110 and an instrumentation amplifier 120. The instrumentation amplifier 120 comprises a first input end, a second input end, a third input end and a fourth input end, wherein the first end of the high-order correction circuit is connected with the first input end of the instrumentation amplifier 120 and is used for inputting a first voltage to the first input end of the instrumentation amplifier 120; a second terminal of the high-order correction circuit is connected to a second input terminal of instrumentation amplifier 120 for inputting a second voltage to the second input terminal of instrumentation amplifier 120, and instrumentation amplifier 120 is configured to correct a drift voltage between the third input terminal and the fourth input terminal based on the first voltage and the second voltage.
In this embodiment, a third input terminal of the instrumentation amplifier 120 may be configured to be connected to a first terminal of the sensor 200 to receive the first voltage signal output by the first terminal of the sensor 200, and a fourth input terminal may be configured to be connected to a second terminal of the sensor 200 to receive the second voltage signal output by the second terminal of the sensor 200, so as to obtain the drift voltage input by the sensor 200 into the instrumentation amplifier 120 according to the first voltage signal and the second voltage signal. The drift voltage is a difference between the first voltage signal and the second voltage signal. The high-order correction circuit may be configured to input a first voltage to the first input terminal of instrumentation amplifier 120 and a second voltage to the second input terminal of instrumentation amplifier 120, so that instrumentation amplifier 120 corrects the drift voltage by the first voltage and the second voltage.
The drift voltage correction circuit 100 provided by the application can realize that the voltage difference value output to the instrumentation amplifier by the two pins of the sensor 200 is corrected, so that the drift voltage is reduced, the influence of the drift voltage on an output signal is reduced, and the performance of the drift voltage correction circuit 100 is improved.
In some embodiments, referring to fig. 2, the instrumentation amplifier 120 includes a first amplifier OP1, a second amplifier OP2, and a feedback circuit 122.
The first non-inverting input terminal VINP of the first amplifier OP1 is the third input terminal of the instrumentation amplifier 120, the second non-inverting input terminal VINP1 is the first input terminal of the instrumentation amplifier 120, and the inverting input terminal INN1 is connected to the output terminal of the first amplifier OP1 through the feedback circuit 122; the first non-inverting input VINN of the second amplifier OP2 is the fourth input of the instrumentation amplifier 120, the second non-inverting input VINN1 is the second input of the instrumentation amplifier 120, and the inverting input INN2 is connected to the output of the second amplifier OP2 through the feedback circuit 122. Correspondingly, the first voltage signal and the second voltage signal of the sensor 200 are respectively input to the instrumentation amplifier through the second non-inverting input terminal VINP1 of the first amplifier OP1 and the second non-inverting input terminal VINN1 of the second amplifier OP2, and a voltage difference between the second non-inverting input terminal VINP1 of the first amplifier OP1 and the second non-inverting input terminal VINN1 of the second amplifier OP2 is the drift voltage to be corrected. The high-order correction circuit inputs a first voltage to the instrumentation amplifier through a first non-inverting input VINP of the first amplifier OP1 and inputs a second voltage to the instrumentation amplifier through a first non-inverting input VINN of the second amplifier OP2, so that the instrumentation amplifier corrects a drift voltage between a second non-inverting input VINP1 of the first amplifier OP1 and a second non-inverting input VINN1 of the second amplifier OP2 through the first voltage and the second voltage.
As an embodiment, the feedback circuit 122 may include at least 3 impedance elements for determining amplification factors of the first amplifier OP1 and the second amplifier OP 2. The impedance element may be a resistor, a magnetic bead having a resistance characteristic, or other elements having a resistance characteristic, which is not limited in this embodiment. In some embodiments, the impedance element may be a variable resistor, such as an adjustable resistor, or may be a non-variable resistor, such as a fixed-resistance resistor, a magnetic bead, and the like, which is not limited herein. The adjustable resistor can be realized by a plurality of series/parallel resistors and switches.
For example, referring to fig. 2, the feedback circuit 122 may include a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4, wherein a first end of the first resistor R1 is connected to the output end of the first amplifier OP1, and a second end of the first resistor R1 and a first end of the second resistor R2 are respectively connected to the inverting input terminal INN1 of the first amplifier OP 1; a first end of the third resistor R3 is connected with a second end of the second resistor R2, and a second end of the fourth resistor R4 is connected with an output end of the second amplifier OP 2; the second end of the third resistor R3 and the first end of the fourth resistor R4 are connected to the inverting input terminal INN2 of the second amplifier OP2, respectively. The resistance formed by the series connection of the second resistor R2 and the third resistor R3 can be regarded as the resistance between the two nodes.
The resistance of the first resistor R1 and the resistance of the fourth resistor R4 may be the same, and the resistance of the second resistor R2 and the resistance of the third resistor R3 may be the same. As an example, when the resistances of the first resistor R1 and the fourth resistor R4 are the same and the resistances of the second resistor R2 and the third resistor R3 are the same, the resistances of the first resistor R1 and the second resistor R2 should have a multiple relationship, where the multiple relationship is the amplification factor of the first amplifier OP1 on the corrected first voltage signal and the amplification factor of the second amplifier OP2 on the corrected second voltage signal. The second resistor R2 and the second resistor R3 can adopt adjustable resistors so as to enable the amplification factor of the instrumentation amplifier to be adjustable.
In some embodiments, the high-order correction circuit 110 may include a voltage division module, and may also include a voltage division module and a multiplexer, as long as the first voltage and the second voltage for correction can be selected and output according to requirements.
In one embodiment, referring to fig. 2, the high-order correction circuit 110 includes a voltage division module 112 and a first multiplexer K1, wherein the voltage division module 112 has a plurality of voltage division nodes; the first multiplexer K1 includes a first output terminal, a second output terminal, and a plurality of input terminals; each voltage division node is respectively connected with one input end of a first multiplexer K1, a first output end of the first multiplexer K1 is connected with a first input end of the instrumentation amplifier 120, and a second output end of the first multiplexer K1 is connected with a second input end of the instrumentation amplifier 120; the first multiplexer K1 is used for selecting two voltage dividing nodes, and respectively outputs voltages of the two voltage dividing nodes through a first output terminal and a second output terminal of the first multiplexer K1. That is, a first voltage is input to the first input terminal of the instrumentation amplifier 120 through the first output terminal of the first multiplexer K1, and a second voltage is input to the second input terminal of the instrumentation amplifier 120 through the second output terminal of the first multiplexer K1. Thereby causing instrumentation amplifier 120 to correct the drift voltages input at the third input terminal and the fourth input terminal based on the received first voltage and second voltage.
For example, referring to fig. 3, the first multiplexer K1 includes at least a first multiplexer unit and a second multiplexer unit and a plurality of switches, each connection node is connected to an input terminal of the first multiplexer unit or an input terminal of the second multiplexer unit through one switch, and the first multiplexer K1 inputs a first voltage to a first input terminal VINP1 of the instrumentation amplifier through a first output terminal thereof, i.e., an output terminal VINP2 of the first multiplexer unit, and inputs a second voltage to a second input terminal VINN2 of the instrumentation amplifier through a second output terminal thereof, i.e., an output terminal VINN2 of the second multiplexer unit. The first switch may be a single-pole double-throw switch or a transistor. Taking the example that the first voltage signal input to the third input terminal of the instrumentation amplifier 120 by the sensor 200 is 200mV greater than the fourth voltage signal input to the second input terminal, at this time, the magnitudes of the first voltage and the second voltage input to the instrumentation amplifier 120 by the high-order correction circuit 110 may be controlled by controlling the connection between each connection node in the high-order correction circuit 110 and the first multiplexing unit and the second multiplexing unit, respectively, so that the first voltage received by the first input terminal of the instrumentation amplifier 120 is 200mV less than the second voltage received by the second input terminal, thereby correcting the drift voltage.
In some embodiments, one end of the voltage dividing module 112 is configured to receive the first power voltage VS1, and the other end is connected to ground, the voltage dividing module 112 includes a plurality of voltage dividing resistors connected in series, and the plurality of voltage dividing nodes includes a connection node between every two adjacent voltage dividing resistors. The number of the voltage dividing resistors may be, but is not limited to, 2.
In one embodiment, the resistance values of the voltage dividing resistors may be the same or different. By adopting the arrangement, the voltage between any two divider resistors is the same, and the number of the divider resistors between two nodes corresponding to the first voltage and the second voltage respectively can be determined according to the magnitude of the drift voltage. Because the high-order correction circuit 110 adopts a resistance voltage division mode to carry out correction, the circuit response time is faster, no additional circuit is occupied, and the area of the whole circuit is saved.
In some embodiments, referring to fig. 4, the feedback circuit 122 in the drift voltage correction circuit 100 of the present application includes a first feedback node and a second feedback node, and the drift voltage correction circuit 100 further includes: the low level correction circuit 130 has a first terminal connected to the first feedback node and a second terminal connected to the second feedback node, and the low level correction circuit 130 is configured to output a first correction current to the first feedback node and a second correction current to the second feedback node. By providing the low-order correction circuit 130, it is possible to correct the remaining drift voltage that cannot be corrected by the high-order correction circuit 110 after the drift voltage is corrected by the high-order correction circuit 110.
In some embodiments, the low-order correction circuit 130 may include a current generation circuit 131, a first current mirror circuit 132, and a second current mirror circuit 133. The input end of the current generating circuit 131 is used for accessing a second power voltage and generating a first input current according to the second power voltage; the input end of the first current mirror circuit 132 is connected to the output end of the current generating circuit 131, the first current mirror circuit 132 is configured to generate a second input current and a first correction current according to the first input current, respectively, and the first current mirror circuit 132 includes a first output end and a second output end, where the first output end is configured to output the second input current and the second output end is configured to output the first correction current; the input end of the second current mirror circuit 133 is connected to the first output end of the first current mirror circuit 132, and is configured to generate a second correction current according to the second input current mirror image; wherein the first correction current is in an opposite direction to the second correction current.
As an embodiment, the current generating circuit 131 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first field effect transistor MN1, and a third amplifier OP 3; the fifth resistor R5 and the sixth resistor R6 are connected in series, one end of the fifth resistor R5 is connected to the second power source VS2, one end of the sixth resistor R6 is grounded, the non-inverting input terminal of the third amplifier OP3 is connected between the fifth resistor R5 and the sixth resistor R6, the inverting input terminal is connected between the source of the first fet MN1 and the first end of the seventh resistor R7, the output terminal is connected to the gate of the first fet MN1, and the drain of the first fet MN1 is connected to the first output terminal of the first current mirror circuit 132. After the second power voltage VS2 is divided by the fifth resistor R5 and the sixth resistor R6, it is used as the input voltage of the third amplifier OP3, and the current generating circuit 131 generates a stable first input current (i.e., the current flowing through the seventh resistor R7) through the feedback loop of the third amplifier OP3 and the seventh resistor R7, because the drain of the first field-effect transistor MN1 is connected to the input transistor of the first current mirror circuit 132, the first input current is the input current of the first current mirror circuit 132.
As an embodiment, the first current mirror circuit 132 includes a plurality of first current output branches and a plurality of first switch branches, wherein the plurality of first switch branches are connected to the plurality of first current output branches in a one-to-one correspondence; the second current mirror circuit 133 includes a plurality of second current output branches and a plurality of second switch branches, wherein the plurality of second switch branches are connected to the plurality of second current output branches in a one-to-one correspondence; the low level correction circuit 130 further includes a second multiplexer, the second multiplexer is configured to gate the at least one first switching branch and the at least one second switching branch, sum the current of the gated at least one first switching branch into a first correction current and output the first correction current, and sum the current of the gated at least one second switching branch into a second correction current and output the second correction current. In this embodiment, for the remaining drift voltage that cannot be corrected by the high-order correction circuit 110, the second multiplexer gates the number of the first switching branches and the number of the second switching branches according to the magnitude of the remaining drift voltage that needs to be corrected, so as to sum the currents of the plurality of first switching branches into a first correction current and output the first correction current to the first feedback node of the feedback circuit, and sum the currents of the plurality of second switching branches into a second correction current and output the second correction current to the second feedback node of the feedback circuit, thereby correcting the remaining drift voltage that cannot be corrected by the high-order correction circuit 110.
Wherein, the currents respectively output by the first current output branches are all mirrored from the first input current; the currents respectively output by the second current output branches mirror the input current of the second current mirror circuit 133. As an example, the first current mirror circuit 132 may further include an intermediate output branch, connected to the input tube of the second current mirror circuit, for generating a second input current according to the first input current mirror image, and transmitting the second input current to the second current mirror circuit 133, so that each second current output branch of the second current mirror circuit 133 can mirror the second input current and generate a corresponding branch current.
The circuit structure of the low level correction circuit 130 will be described by way of example, with the transistors in the first current mirror circuit 132 being P-type transistors and the transistors in the second current mirror circuit 133 being N-type transistors. In other examples, the transistor types in the first current mirror circuit 132 and the second current mirror circuit 133 may also be interchanged. Referring to fig. 5, the first current mirror circuit 132 includes a first P-type transistor MP1, a second P-type transistor MP2, a plurality of first current output branches MP3, and a plurality of first switch branches Q1 connected to the plurality of first current output branches MP3 in a one-to-one correspondence; the second current mirror circuit 133 includes a second N-type transistor MN2, a plurality of second current output branches MN3, and a plurality of second switching branches Q2 connected to the plurality of second current output branches MN3 in a one-to-one correspondence. In this example, the first switching branch and the second switching branch are implemented by using different types of transistors, and therefore, each of the first switching branch and the second switching branch is correspondingly connected to two ends of an inverter to achieve synchronization.
In the first current mirror circuit 132, the MP1, the MP2, and the plurality of first current output branches MP3 are current mirror structures, a source thereof is directly or indirectly connected to the second power voltage VS2, and a drain of the MP1 is connected to a drain of the MN1 to obtain a first input current; the MP2 generates the second input current according to the first input current mirror, and each of the first current output branches MP3 generates the branch current in the first direction according to the first input current mirror. Each of the first current output branches MP3 may include one or more PMOS transistors. The control end of each first switching branch Q1 is connected to the input end of an inverter, one connection end is respectively connected to the drain of the corresponding first current output branch MP3, and the other connection end is respectively connected to the second multiplexer K2. When the first switching branch Q1 is turned on, the first current output branch MP3 connected thereto can output a branch current in a first direction.
In the second current mirror circuit 133, MN2 and the plurality of second current output branches MN3 are current mirror structures, and a drain of MN2 is connected to a drain of MP2 to obtain a second input current; each second current output branch MN3 generates a branch current in the second direction according to the second input current mirror. Each of the second current output branches MN3 may include one or more NMOS transistors. The control end of each second switching branch Q2 is connected to the output end of an inverter, one connection end is respectively connected to the drain of the corresponding second current output branch MN3, and the other connection end is respectively connected to the second multiplexer K2. When the second switching branch Q1 is turned on, the second current output branch MP3 connected thereto can output a branch current in the second direction.
In this example, the number of the second current output branches, the number of the first current output branches, and the number of the inverters 134 are the same and are respectively at least one. Since the first switching branches Q1 and the second switching branches Q2 are transistors of different types, the control signal of one switch is inverted by the inverter, and then the other switch is controlled to synchronize the states of the two switching branches, so that a pair of currents having the same magnitude and opposite directions can be generated by the first current mirror circuit 132 and the second current mirror circuit 133.
The low-order correction circuit 130 firstly generates a first input current through the current generation circuit 131, and then inputs the first input current into the first current mirror circuit 132 through the MP1, in the first current mirror circuit 132, the first input current can be mirrored by the plurality of first current output branches MP3 to generate a plurality of branch currents in a first direction, and mirrored by the MP2 to generate a second input current, so that the input tube MN2 of the second current mirror circuit 133 obtains an input current, and the second input current is mirrored by the plurality of second current output branches MN3 to obtain a plurality of branch currents in a second direction. The inverter 134 controls the first switching branches Q1 and the second switching branches Q2 to be turned on or off, the second multiplexer K2 selects currents to be output from the first switching branches and the second switching branches, respectively, sums the currents into a first correction current in a first direction and a second correction current in a second direction, and outputs the currents to the first feedback node and the second feedback node of the instrumentation amplifier, and a voltage difference is formed between two output ends of the instrumentation amplifier by the first correction current and the second correction current, thereby correcting the remaining drift voltage.
According to the drift voltage correction circuit, the instrumentation amplifier, the high-order correction circuit and the low-order correction circuit are arranged; the high-order correction circuit can correct the drift voltage input into the instrumentation amplifier, and when the drift voltage is corrected by the high-order correction circuit, the residual drift voltage can be corrected by the low-order correction circuit 130. Namely, the correction circuit can correct the drift voltage twice, so that the influence of the drift voltage on the instrumentation amplifier is greatly reduced, and the performance of the instrumentation amplifier is improved.
Another embodiment of the present application provides an integrated circuit, in which the drift voltage correction circuit in the above embodiments is disposed. The integrated circuit can correct the drift voltage output from the sensor 200 by the drift voltage correction circuit of the foregoing embodiment. In addition, the integrated circuit may be a chip, and the specific type of the chip is not limited, for example, the integrated circuit may be a computer chip, or may be a chip of an embedded device or other electronic devices.
Another embodiment of the present application provides a measuring apparatus, which includes the sensor 200 and the integrated circuit, and the sensor 200 is connected to the integrated circuit. The sensor 200 may be a pressure sensor, a position sensor, a gas sensor, a liquid level sensor, an energy consumption sensor, a speed sensor, an acceleration sensor, a biosensor, etc. The present embodiment does not limit the specific type of the sensor 200.
The application further provides an electronic device, the electronic device includes a device body and the above measuring device, where the electronic device may be an electronic scale such as a weight scale and a body fat scale, or an intelligent wearable product such as a bracelet, a watch and an intelligent underwear, or a household appliance such as a refrigerator, a floor cleaning robot, an air conditioner, a television and an intelligent toilet, or a terminal device such as a mobile phone, a tablet computer, a notebook computer, a desktop computer and an upper computer, or an internet of things device, or an earphone, an electronic cigarette and a mobile power supply, and the embodiment does not limit the type of the electronic device.
In summary, the drift voltage correction circuit, the integrated circuit, the measuring device and the electronic device provided in the embodiments of the present application are provided with an instrumentation amplifier and a high-order correction circuit. The instrument amplifier comprises a first input end, a second input end, a third input end and a fourth input end; the first end of the high-order correction circuit is connected with the first input end of the instrumentation amplifier and is used for inputting a first voltage to the first input end of the instrumentation amplifier; the second end of the high-order correction circuit is connected with the second input end of the instrumentation amplifier and is used for inputting a second voltage to the second input end of the instrumentation amplifier; the instrumentation amplifier is configured to correct a drift voltage between the third input terminal and the fourth input terminal based on the first voltage and the second voltage. By adopting the circuit, the drift voltage input into the instrumentation amplifier can be calibrated, and the performance of the instrumentation amplifier is improved.
Although the present application has been described with reference to the preferred embodiments, it is to be understood that the present application is not limited to the disclosed embodiments, but rather, the present application is intended to cover various modifications, equivalents and alternatives falling within the spirit and scope of the present application.
Claims (10)
1. A drift voltage correction circuit, comprising:
an instrumentation amplifier comprising a first input, a second input, a third input, and a fourth input;
a first end of the high-order correction circuit is connected with the first input end of the instrumentation amplifier and is used for inputting a first voltage to the first input end of the instrumentation amplifier; the second end of the high-order correction circuit is connected with the second input end of the instrumentation amplifier and is used for inputting a second voltage to the second input end of the instrumentation amplifier;
the instrumentation amplifier is configured to correct a drift voltage between the third input and the fourth input based on the first voltage and the second voltage.
2. The circuit of claim 1, wherein the high-order correction circuit comprises a voltage divider module and a first multiplexer, the voltage divider module having a plurality of voltage divider nodes; the first multiplexer comprises a first output end, a second output end and a plurality of input ends;
each voltage division node is respectively connected with one input end of the first multiplexer, the first output end of the first multiplexer is connected with the first input end of the instrumentation amplifier, and the second output end of the first multiplexer is connected with the second input end of the instrumentation amplifier;
the first multiplexer is configured to select two voltage division nodes, and output voltages of the two voltage division nodes through the first output terminal and the second output terminal of the first multiplexer, respectively.
3. The circuit of claim 2, wherein the voltage divider module has one end for receiving a first power voltage and the other end connected to ground, and the voltage divider module comprises a plurality of voltage divider resistors connected in series, and the plurality of voltage divider nodes comprise a connection node between every two adjacent voltage divider resistors.
4. The circuit of any of claims 1-3, wherein the instrumentation amplifier comprises a first amplifier, a second amplifier, and a feedback circuit;
the first in-phase input end of the first amplifier is the third input end of the instrumentation amplifier, the second in-phase input end of the first amplifier is the first input end of the instrumentation amplifier, and the inverting input end of the first amplifier is connected with the output end of the first amplifier through the feedback circuit;
the first in-phase input end of the second amplifier is the fourth input end of the instrumentation amplifier, the second in-phase input end of the second amplifier is the second input end of the instrumentation amplifier, and the inverting input end of the second amplifier is connected with the output end of the second amplifier through the feedback circuit.
5. The circuit of claim 4, wherein the feedback circuit comprises a first feedback node and a second feedback node;
the drift voltage correction circuit further includes:
a low side correction circuit having a first terminal connected to the first feedback node and a second terminal connected to the second feedback node, the low side correction circuit configured to output a first correction current to the first feedback node and a second correction current to the second feedback node.
6. The circuit of claim 5, wherein the low correction circuit comprises: the current generation circuit comprises a current generation circuit, a first current mirror circuit and a second current mirror circuit;
the input end of the current generating circuit is used for accessing a second power supply voltage and generating a first input current according to the second power supply voltage;
the input end of the first current mirror circuit is connected to the output end of the current generation circuit, the first current mirror circuit is used for respectively generating a second input current and a first correction current according to the first input current in a mirror image mode, the first current mirror circuit comprises a first output end and a second output end, the first output end is used for outputting the second input current, and the second output end is used for outputting the first correction current;
the input end of the second current mirror circuit is connected to the first output end of the first current mirror circuit and used for generating the second correction current according to the second input current mirror image;
wherein the first correction current is in an opposite direction to the second correction current.
7. The circuit of claim 6, wherein the first current mirror circuit comprises a plurality of first current output branches and a plurality of first switching branches, wherein the plurality of first switching branches are connected in a one-to-one correspondence with the plurality of first current output branches;
the second current mirror circuit comprises a plurality of second current output branches and a plurality of second switch branches, wherein the plurality of second switch branches are connected with the plurality of second current output branches in a one-to-one correspondence manner;
the low-order correction circuit further comprises a second multiplexer, wherein the second multiplexer is used for gating at least one first switching branch and at least one second switching branch, summing the current of the gated at least one first switching branch into the first correction current and outputting the first correction current, and summing the current of the gated at least one second switching branch into the second correction current and outputting the second correction current.
8. An integrated circuit, characterized in that: the integrated circuit is provided with a drift voltage correction circuit as claimed in any one of claims 1 to 7.
9. A measuring device comprising a sensor and an integrated circuit as claimed in claim 8, said sensor being connected to said integrated circuit.
10. An electronic apparatus, comprising an apparatus body and the measuring device of claim 9, wherein the measuring device is provided to the apparatus body.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111601508.3A CN114489229B (en) | 2021-12-24 | 2021-12-24 | Drift voltage correction circuit, integrated circuit, measuring device, and electronic apparatus |
| PCT/CN2022/141299 WO2023116869A1 (en) | 2021-12-24 | 2022-12-23 | Drift voltage correction circuit, integrated circuit, measurement apparatus, and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111601508.3A CN114489229B (en) | 2021-12-24 | 2021-12-24 | Drift voltage correction circuit, integrated circuit, measuring device, and electronic apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114489229A true CN114489229A (en) | 2022-05-13 |
| CN114489229B CN114489229B (en) | 2023-01-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111601508.3A Active CN114489229B (en) | 2021-12-24 | 2021-12-24 | Drift voltage correction circuit, integrated circuit, measuring device, and electronic apparatus |
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| Country | Link |
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| CN (1) | CN114489229B (en) |
| WO (1) | WO2023116869A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023116869A1 (en) * | 2021-12-24 | 2023-06-29 | 芯海科技（深圳）股份有限公司 | Drift voltage correction circuit, integrated circuit, measurement apparatus, and electronic device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1387478A2 (en) * | 2002-07-31 | 2004-02-04 | Micrel Incorporated | Adding a Laplace transform zero to a linear integrated circuit for frequency stability |
| US6750641B1 (en) * | 2003-06-05 | 2004-06-15 | Texas Instruments Incorporated | Method and circuit for temperature nonlinearity compensation and trimming of a voltage reference |
| CN1561000A (en) * | 2004-03-02 | 2005-01-05 | 复旦大学 | Pipeline structure analogue/digital converter of controlling input common-mode drift |
| US7161412B1 (en) * | 2005-06-15 | 2007-01-09 | National Semiconductor Corporation | Analog calibration of a current source array at low supply voltages |
| CN106052862A (en) * | 2010-01-27 | 2016-10-26 | 英特赛尔美国股份有限公司 | Automatic calibration technique for time of flight (TOF) transceivers |
| CN105743446B (en) * | 2016-01-28 | 2018-12-18 | 芯海科技（深圳）股份有限公司 | A kind of drift voltage correcting circuit for instrument amplifier |
| CN212343738U (en) * | 2020-05-07 | 2021-01-12 | 芯海科技（深圳）股份有限公司 | Drift voltage correction circuit, integrated circuit, and electronic apparatus |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2480893C1 (en) * | 2011-12-08 | 2013-04-27 | Федеральное Государственное Унитарное Предприятие "Государственный научно-производственный ракетно-космический центр "ЦСКБ-Прогресс" (ФГУП "ГНПРКЦ "ЦСКБ-Прогресс") | Instrumental amplifier with periodical drift correction |
| CN202737817U (en) * | 2012-03-14 | 2013-02-13 | 无锡纳讯微电子有限公司 | Gain calibrating system of instrument amplifier |
| US9385673B2 (en) * | 2014-02-14 | 2016-07-05 | Analog Devices Global | Amplifier with offset compensation |
| CN114489229B (en) * | 2021-12-24 | 2023-01-31 | 芯海科技（深圳）股份有限公司 | Drift voltage correction circuit, integrated circuit, measuring device, and electronic apparatus |
-
2021
- 2021-12-24 CN CN202111601508.3A patent/CN114489229B/en active Active
-
2022
- 2022-12-23 WO PCT/CN2022/141299 patent/WO2023116869A1/en unknown
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1387478A2 (en) * | 2002-07-31 | 2004-02-04 | Micrel Incorporated | Adding a Laplace transform zero to a linear integrated circuit for frequency stability |
| US6750641B1 (en) * | 2003-06-05 | 2004-06-15 | Texas Instruments Incorporated | Method and circuit for temperature nonlinearity compensation and trimming of a voltage reference |
| CN1561000A (en) * | 2004-03-02 | 2005-01-05 | 复旦大学 | Pipeline structure analogue/digital converter of controlling input common-mode drift |
| US7161412B1 (en) * | 2005-06-15 | 2007-01-09 | National Semiconductor Corporation | Analog calibration of a current source array at low supply voltages |
| CN106052862A (en) * | 2010-01-27 | 2016-10-26 | 英特赛尔美国股份有限公司 | Automatic calibration technique for time of flight (TOF) transceivers |
| CN105743446B (en) * | 2016-01-28 | 2018-12-18 | 芯海科技（深圳）股份有限公司 | A kind of drift voltage correcting circuit for instrument amplifier |
| CN212343738U (en) * | 2020-05-07 | 2021-01-12 | 芯海科技（深圳）股份有限公司 | Drift voltage correction circuit, integrated circuit, and electronic apparatus |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023116869A1 (en) * | 2021-12-24 | 2023-06-29 | 芯海科技（深圳）股份有限公司 | Drift voltage correction circuit, integrated circuit, measurement apparatus, and electronic device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114489229B (en) | 2023-01-31 |
| WO2023116869A1 (en) | 2023-06-29 |
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