CN205450659U - Signal processing circuit - Google Patents
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- CN205450659U CN205450659U CN201521142129.2U CN201521142129U CN205450659U CN 205450659 U CN205450659 U CN 205450659U CN 201521142129 U CN201521142129 U CN 201521142129U CN 205450659 U CN205450659 U CN 205450659U
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Abstract
The utility model discloses a signal processing circuit. Signal processing circuit includes: the signal source for provide the source signal, the amplifier, with the signal source is connected, and is right the source signal enlargies, zero setting circuit, with the amplifier is connected, compensates the signal after enlargeing, adc, with the amplifier with zero setting circuit connects, will signal after the compensation is transformed into data signal, and digital signal processor, with adc connects, and it is right to be used for data signal carries out operation, wherein, zero setting circuit connects the output of amplifier is and provide offset current at the output of amplifier, thereby restraines the drift of signal source with the drift of amplifier. This signal processing circuit utilizes the zero setting circuit who is connected with the output of amplifier to restrain a plurality of circuit module's drift.
Description
Technical field
This utility model relates to sensor technology, more particularly, to signal processing circuit.
Background technology
The performance of signal processing circuit self has important impact to the power of test of sensor.The null offset of sensor and/or signal processing circuit may cause the detection sensitivity of sensor and precision to reduce.Null offset refers to when the input signal of sensor is zero, and output signal deviates fixed value and drifts about.Null offset may be caused by many reasons, the attribute of the manufacturing process of such as sensor and/or integrated circuit, circuit structure itself, mains fluctuations, variations in temperature etc..
Existing signal processing circuit suppression null offset measure include use through overaging components and parts, improve power supply stability and utilize zeroing circuit that null offset is mitigated or eliminated.The operation principle of zeroing circuit includes blowing resistive method, switched-capacitor methods, offset voltage belt current method and numeral removing method etc..But, existing zeroing circuit or structure is the most complicated, otherwise precision does not reaches requirement, and the null offset on Wheatstone bridge can only be eliminated, it is impossible to eliminate the null offset of amplifier.
Fig. 1 illustrates the schematic circuit of the signal processing circuit according to prior art.This signal processing circuit include for provide the signal source 110 of source signal, for the zeroing circuit 120 that signal source is returned to zero, for the amplifier 130 that source signal is amplified, for will compensate after signal be transformed into digital signal analog-digital converter (ADC) 140 and according to digital signal produce control logical signal digital signal processor 150.
This zeroing circuit 120 is connected to the outfan of signal source 110, thus can only be for the output signal of signal source 110, namely source signal suppression null offset.The null offset of amplifier 130 self still results in the source signal through amplifying and produces error.
Therefore, it is desirable to improve the design of signal processing circuit further so that zeroing circuit can be with the null offset of the multiple different circuit modules of suppression circuit.
Utility model content
The purpose of this utility model is to provide signal processing circuit and the method for a kind of null offset that can suppress multiple circuit module.
According to one side of the present utility model, it is provided that a kind of signal processing circuit, including: signal source, it is used for providing source signal；Amplifier, is connected with described signal source, is amplified described source signal；Zeroing circuit, is connected with described amplifier, compensates the signal after amplifying；Analog-digital converter, is connected with described amplifier and described zeroing circuit, and the signal after described compensation is transformed into digital signal；And digital signal processor, it is connected with described analog-digital converter, for described digital signal is carried out calculation process, wherein, described zeroing circuit is connected to the outfan of described amplifier and provides at the outfan of amplifier and compensate electric current, thus suppresses null offset and the null offset of described amplifier of described signal source.
Preferably, described compensation electric current is applied the output impedance to described amplifier out by described zeroing circuit, to raise or to drag down the current potential of outfan.
Preferably, described signal source includes that sensor, described source signal are sensor signals.
Preferably, described signal source includes that Wheatstone bridge, described sensor are positioned at least one brachium pontis of described Wheatstone bridge.
Preferably, described sensor includes the sensor element sensitive at least one physical quantity in temperature, pressure, load, strain, acceleration, displacement.
Preferably, described amplifier has outfan, thus provides the output signal of amplifier at described outfan.
Preferably, described zeroing circuit has for providing the outfan compensating electric current, and the outfan of described zeroing circuit is connected with the outfan of described amplifier.
Preferably, when positive polarity drift voltage, described zeroing circuit draws electric current from the outfan of described amplifier, and when negative polarity drift voltage, described zeroing circuit is to the outfan injection current of described amplifier.
Preferably, described amplifier has the first outfan and the second outfan, and described first outfan is hot end, and described second outfan is cold end, thus provides the output signal of amplifier between described first outfan and described second outfan.
Preferably, described zeroing circuit has the first outfan being respectively configured to provide the first compensation electric current and the second outfan providing the second compensation electric current, first outfan of described zeroing circuit is connected with the first outfan of described amplifier, and the second outfan of described zeroing circuit is connected with the second outfan of described amplifier.
Preferably, when positive polarity drift voltage, described zeroing circuit draws electric current from the first outfan of described amplifier, or to the second outfan injection current of described amplifier, when negative polarity drift voltage, described zeroing circuit is to the first outfan injection current of described amplifier, or draws electric current from the second outfan of described amplifier.
Preferably, described zeroing voltage includes: at least one current source；And at least one switch, it being connected in series with a current source at least one current source described respectively, at least one current source described provides described compensation electric current via at least one switch described.
Preferably, described source signal signal processing circuit also includes: controller, and described controller is connected with described zeroing circuit, for controlling size of current and the action of at least one switch described of at least one current source described.
nullPreferably，At least one current source described includes first to fourth current source，At least one switch described includes first to fourth switch，Described first to fourth switch is connected in series with described first to fourth current source respectively，Wherein，Described first current source is connected to the first outfan of described amplifier via described first switch，For providing the electric current of first direction when described first switch Guan Bi，Described second current source is connected to the second outfan of described amplifier via described second switch，For providing the electric current of first direction when described second switch closes，Described 3rd current source is connected to the first outfan of described amplifier via described 3rd switch，For providing the electric current of second direction when described 3rd switch Guan Bi，Described 4th current source is connected to the second outfan of described amplifier via described 4th switch，For providing the electric current of second direction when described 4th switch Guan Bi，The electric current of described first direction is for the outside injection current of described zeroing circuit，The electric current of described second direction is for drawing electric current from the outside of described zeroing circuit.
Preferably, described zeroing circuit is by selecting different switches to obtain the compensation electric current of different directions.
Preferably, described zeroing circuit obtains different size of compensation voltage by the size of current of regulation current source.
Preferably, at least one current source described includes respectively: reference current source；And the first mirror current source of described reference current source and the second mirror are to current source, wherein, described first mirror current source includes the first branch road of multiple parallel connection, each first branch road includes the first electron current source that is serially connected and son the first switch, described second mirror current source includes that the second branch road of multiple parallel connection, each second branch road include the second electron current source that is serially connected and the second son switch.
Preferably, at least one current source described is by selecting different son switches to obtain the compensation electric current of different directions and/or size.
According to another aspect of the present utility model, it is provided that a source signals processing method, including: obtain source signal from signal source；Amplifier is used to amplify described source signal；Outfan at described amplifier provides and compensates electric current, thus suppresses null offset and the null offset of described amplifier of described signal source；And the signal after described compensation is transformed into digital signal.
Preferably, described amplifier provides output signal at outfan, and described compensation electric current applies the output impedance to described amplifier, to raise or to drag down the current potential of the outfan of amplifier, thus at least partly offsets drift voltage.
Preferably, when positive polarity drift voltage, described zeroing circuit draws electric current from the outfan of described amplifier, and when negative polarity drift voltage, described zeroing circuit is to the outfan injection current of described amplifier.
Preferably, described amplifier provides difference signal between the first outfan and the second outfan, wherein said first outfan is hot end, described second outfan is cold end, described compensation electric current applies the output impedance to described amplifier, to raise or to drag down the current potential of at least one the first outfan and the second outfan, thus at least partly offset drift voltage.
Preferably, when positive polarity drift voltage, described zeroing circuit draws electric current from the first outfan of described amplifier, or to the second outfan injection current of described amplifier, when negative polarity drift voltage, described zeroing circuit is to the first outfan injection current of described amplifier, or draws electric current from the second outfan of described amplifier.
Preferably, the respective current sources in multiple current sources is selected by switch, it is thus achieved that the compensation electric current of different directions.
Preferably, different size of compensation voltage is obtained by the size of current of regulation current source.
According to the signal processing circuit of embodiment of the present utility model, zeroing circuit is set at amplifier out, to eliminate null offset.Both the null offset in signal source can have been eliminated, it is also possible to eliminate the null offset of amplifier, and simplify design complexities and required precision.
In a preferred embodiment, zeroing circuit utilizes the low impedance characteristic of the outfan of amplifier and the high-impedance behavior of the input of analog-digital converter, automatically compensates the output signal of amplifier, thus suppresses the null offset of signal processing circuit.
Accompanying drawing explanation
By description to this utility model embodiment referring to the drawings, of the present utility model above-mentioned and other objects, features and advantages will be apparent from, in the accompanying drawings:
Fig. 1 illustrates the schematic circuit of the signal processing circuit according to prior art.
Fig. 2 illustrates the schematic circuit of the signal processing circuit according to this utility model first embodiment.
Fig. 3 illustrates the schematic circuit of the signal processing circuit according to this utility model the second embodiment.
Fig. 4 illustrates the schematic circuit of the signal processing circuit example according to this utility model first embodiment.
Fig. 5 illustrates the schematic circuit of the signal processing circuit example according to this utility model the second embodiment.
Fig. 6 is shown in the schematic circuit of the controllable current source that zeroing circuit uses.
Detailed description of the invention
It is more fully described this utility model hereinafter with reference to accompanying drawing.In various figures, identical element uses similar reference to represent.For the sake of clarity, the various piece in accompanying drawing is not necessarily to scale.Furthermore, it is possible to not shown part known to some.
Describe hereinafter the specific details of many of the present utility model, the structure of such as device, material, size, process technique and technology, in order to be more clearly understood that this utility model.But the most as the skilled person will understand, this utility model can not be realized according to these specific details.
This utility model can present in a variety of manners, some of them example explained below.
Fig. 2 illustrates the schematic circuit of the signal processing circuit according to this utility model first embodiment.This signal processing circuit includes for providing the signal source 110 of source signal, for the amplifier 130 being amplified source signal, for the zeroing circuit 220 returning to zero the output signal of amplifier, for providing the control circuit 230 of control signal, the signal after compensating are transformed into the analog-digital converter (ADC) 140 of digital signal and produce the digital signal processor (DSP) 150 of control logical signal according to digital signal for zeroing circuit.
As in figure 2 it is shown, between signal source 110, amplifier 130, analog-digital converter 140 and zeroing circuit 220, signal is with difference form transmission.Correspondingly, signal source 110 has two outfans providing source signal, amplifier 130 has two outfans receiving two inputs of source signal and the signal after providing amplification from signal source 110, analog-digital converter 140 has two inputs receiving the signal amplified from amplifier 130, and zeroing circuit 220 has for providing two outfans compensating electric current to described amplifier 130.
In signal processing circuit, the sensor circuit of signal source 110 e.g. wheatstone bridge configuration.In Wheatstone bridge, at least one brachium pontis can include sensor element, such as MEMS sensor element.The element that sensor element is e.g. sensitive at least one physical quantity in temperature, pressure, load, strain, acceleration, displacement.
This zeroing circuit 220 is connected between the outfan of amplifier 130 and the input of analog to digital conversion circuit 140, thus the output signal for amplifier compensates to suppress null offset.In this embodiment, the outfan at amplifier 130 arranges zeroing circuit, both can eliminate the null offset in signal source, it is also possible to eliminates the null offset of amplifier, and simplifies design complexities and required precision.
Fig. 3 illustrates the schematic circuit of the signal processing circuit according to this utility model the second embodiment.The source signal in signal processing circuit according to the second embodiment is single-ended signal, rather than the differential signal in first embodiment.
As it is shown on figure 3, between signal source 110, amplifier 130, analog-digital converter 140 and zeroing circuit 220, signal is with the form transmission of single-ended signal.Correspondingly, signal source 110 has the outfan providing source signal, amplifier 130 has the outfan receiving an input of source signal and the signal after providing amplification from signal source 110, analog-digital converter 140 has the input receiving the signal amplified from amplifier 130, and zeroing circuit 220 has for providing the outfan compensating electric current to described amplifier 130.
Fig. 4 illustrates the schematic circuit of the signal processing circuit example according to this utility model first embodiment, there is shown signal source 110, amplifier 130, analog-digital converter 140 and zeroing circuit 220, but not shown digital signal processor 150.
In this example, sensor element e.g. sensitive resistance.Signal source 110 is the Wheatstone bridge of four sensitive resistance R1 to R4 compositions.The physical quantity of sensitive resistance R1 to R4 response external produces source signal.Amplifier 130 is equivalent to the first branch road and second branch road of symmetry.First branch road includes the controllable current source Ia1 and resistance Ra1 of series connection, and the second branch road includes the controllable current source Ia2 and resistance Ra2 of series connection.Source signal is in the way of Differential Input, it is provided that to the control end of controllable current source Ia1 and Ia2.Change the size of the output electric current of controllable current source Ia1 and Ia2 according to source signal, thus on resistance Ra1 and Ra2, produce pressure drop.First output terminals A MP_OP of amplifier 130 is connected to controllable current source Ia1 and the intermediate node of resistance Ra1, second output terminals A MP_ON is connected to controllable current source Ia2 and the intermediate node of resistance Ra2, thus provides the output signal of amplifier between the first output terminals A MP_OP and the second output terminals A MP_ON.As it is shown on figure 3, resistance Ra1 and Ra2 of amplifier 130 is the output impedance of the first outfan and the second outfan the most respectively.
Analog-digital converter 140 and zeroing circuit 220 are connected between the first outfan of amplifier 130 and the second outfan.Zeroing circuit 220 has for providing first outfan of the first compensation electric current Icp and for providing second outfan of the second compensation electric current Icn.Zeroing circuit 220 applies the output impedance to amplifier 130 outfan by compensating electric current, to raise or to drag down the current potential of outfan.
Further, zeroing circuit 220 includes first to fourth current source I1 to I4 and first to fourth switch S1 to S4.First current source I1 and the second current source I2 provides the electric current of first direction respectively via the first switch S1 and second switch S2, and the 3rd current source I3 and the 4th current source I4 provides the electric current of second direction respectively via the 3rd switch S3 and the 4th switch S4.The electric current of first direction refers to one of current source in zeroing circuit 22 the first outfan to amplifier 130 and the second outfan injection current, and the electric current of second direction refers to that one of current source in zeroing circuit 22 the first output terminals A MP_OP from amplifier 130 and second output terminals A MP_ON draw electric current.
Signal processing circuit can work under calibration mode and normal mode.
In the calibration mode, the physical quantity of the response of the sensor element in signal source 110 is zero.Such as, at sensor element under pressure-sensitive situation, sensor element is made to bear zero pressure the most in the calibration mode.If signal source 110 and the drift of amplifier 130 inferred-zero, then the voltage between two outfans of amplifier 130 is zero.If any one in signal source 110 and amplifier 130 also exists null offset, then between two outfans of amplifier 130, there is drift voltage.Correspondingly, there is drift voltage between the first output terminals A MP_OP and second output terminals A MP_ON of amplifier 130.Use voltmeter or comparator, measure polarity and the size of drift voltage.
Then, according to the polarity of drift voltage, the pair of switches in switch S1 to S4 is selected.
If drift voltage is positive polarity, when the i.e. first output terminals A MP_OP voltage is more than the second output terminals A MP_ON terminal voltage, then switch S2 and S3 Guan Bi, switch S1 and S4 disconnects.Result, the current source I3 of zeroing circuit 220 draws electric current Icp from the first output terminals A MP_OP, the first output terminals A MP_OP voltage is made to reduce the voltage of one (Icp*R), current source I2 is to the second output terminals A MP_ON end injection current Icn so that the second output terminals A MP_ON terminal voltage increases the voltage of one (Icn*R).As it has been described above, R represents the output impedance of amplifier 130.By regulating the size of Icp and Icn, make the first output terminals A MP_OP and the second output terminals A MP_ON terminal voltage equal.
Similarly, if drift voltage is positive polarity, when the i.e. first output terminals A MP_OP voltage is less than the second output terminals A MP_ON end, then switch S1 and S4 Guan Bi, switch S2 and S3 disconnects.Result, the current source I1 of zeroing circuit 220 is to the first output terminals A MP_OP injection current Icp, the first output terminals A MP_OP voltage is made to increase the voltage of one (Icp*R), current source I3 draws electric current Icn from the second output terminals A MP_ON end so that the second output terminals A MP_ON terminal voltage reduces the voltage of one (Icn*R).As it has been described above, R represents the output impedance of amplifier.By regulating the size of Icp and Icn, make the first output terminals A MP_OP and the second output terminals A MP_ON terminal voltage equal.
According to the size of drift voltage, the output electric current I of controllable current source Is can regulate between the scope of 0-I0, therefore, it can the size by changing output electric current I, it is also possible to produce different size of compensation voltage.The size of the electric current of current source can be controlled by depositor respectively.
In the normal mode, the switch being pre-selected under above-mentioned calibration mode remains closed, and the output electric current I of current source Is keeps constant.The physical quantity of the sensor element response external in signal source 110 produces source signal.Source signal is amplified by amplifier 130, and zeroing circuit 220 compensates electric current in two outfan superpositions of amplifier 130.This compensation electric current not only eliminates the impact of the null offset of signal source 110, but also eliminates the impact of the null offset of amplifier 130.Therefore, the voltage received between two inputs of analog-digital converter 140 has eliminated the impact of the null offset of multiple circuit module.
Fig. 5 illustrates the schematic circuit of the signal processing circuit example according to this utility model first embodiment, there is shown signal source 110, amplifier 130, analog-digital converter 140 and zeroing circuit 220, but not shown digital signal processor 150.
In this example, sensor element e.g. sensitive resistance.Signal source 110 is the Wheatstone bridge of four sensitive resistance R1 to R4 compositions.The physical quantity of sensitive resistance R1 to R4 response external produces source signal.Amplifier 130 is equivalent to the first branch road and second branch road of symmetry.First branch road includes the controllable current source Ia1 and resistance Ra1 of series connection, and the second branch road includes the controllable current source Ia2 and resistance Ra2 of series connection.Source signal is in the way of single-ended signal, it is provided that to the control end of controllable current source Ia1.Change the size of the output electric current of controllable current source Ia1 according to source signal, thus on resistance Ra1, produce pressure drop.Output terminals A MP_O of amplifier 130 is connected to controllable current source Ia1 and the intermediate node of resistance Ra1, thus provides the output signal of amplifier in output terminals A MP_O.As it is shown on figure 3, the resistance Ra1 of amplifier 130 is the output impedance of outfan the most respectively.
Analog-digital converter 140 and zeroing circuit 220 are connected between the outfan of amplifier 130.Zeroing circuit 220 has for providing the outfan compensating electric current Ic.Zeroing circuit 220 applies the output impedance to amplifier 130 outfan by compensating electric current, to raise or to drag down the current potential of outfan.
Further, zeroing circuit 220 includes the first current source I1 and the second current source I3 and the first switch S1 and the 3rd switch S3.First current source I1 provides the electric current of first direction via the first switch S1, and the 3rd current source I3 provides the electric current of second direction via the 3rd switch S3.The electric current of first direction refer to the current source in zeroing circuit 220 to one of the outfan of amplifier 130 injection current, the electric current of second direction refers to that one of current source in zeroing circuit 220 the first output terminals A MP_OP from amplifier 130 and second output terminals A MP_ON draw electric current.
Signal processing circuit can work under calibration mode and normal mode.
In the calibration mode, the physical quantity of the response of the sensor element in signal source 110 is zero.Such as, at sensor element under pressure-sensitive situation, sensor element is made to bear zero pressure the most in the calibration mode.If signal source 110 and the drift of amplifier 130 inferred-zero, then the voltage at the outfan of amplifier 130 is zero.If any one in signal source 110 and amplifier 130 also exists null offset, then between the outfan of amplifier 130, there is drift voltage.Correspondingly, output terminals A MP_O of amplifier 130 also exists drift voltage.Use voltmeter or comparator, measure polarity and the size of drift voltage.
Then, according to the polarity of drift voltage, a switch in switch S1 and S3 is selected.
If drift voltage is positive polarity, when i.e. output terminals A MP_O voltage is more than ideal value, then switch S3 Guan Bi, switch S1 disconnects.As a result, the current source I3 of zeroing circuit 220 draws electric current Ic from output terminals A MP_O so that output terminals A MP_O voltage reduces the voltage of one (Ic*R).As it has been described above, R represents the output impedance of amplifier 130.By regulating the size of Ic, make output terminals A MP_O terminal voltage equal to ideal value.
Similarly, if drift voltage is positive polarity, when i.e. output terminals A MP_O voltage is less than ideal value, then switch S1 Guan Bi, switch S3 disconnects.As a result, the current source I1 of zeroing circuit 220 is to output terminals A MP_O injection current Ic so that output terminals A MP_O voltage increases the voltage of one (Ic*R).As it has been described above, R represents the output impedance of amplifier.By regulating the size of Ic, make output terminals A MP_O terminal voltage equal to ideal value.
According to the size of drift voltage, the output electric current I of controllable current source Is can regulate between the scope of 0-I0, therefore, it can the size by changing output electric current I, it is also possible to produce different size of compensation voltage.The size of the electric current of current source can be controlled by depositor respectively.
In the normal mode, the switch being pre-selected under above-mentioned calibration mode remains closed, and the output electric current I of current source Is keeps constant.The physical quantity of the sensor element response external in signal source 110 produces source signal.Source signal is amplified by amplifier 130, and zeroing circuit 220 compensates electric current in the outfan superposition of amplifier 130.This compensation electric current not only eliminates the impact of the null offset of signal source 110, but also eliminates the impact of the null offset of amplifier 130.Therefore, the voltage received between two inputs of analog-digital converter 140 has eliminated the impact of the null offset of multiple circuit module.
Fig. 6 is shown in the schematic circuit of the controllable current source that zeroing circuit uses.This controllable current source includes reference current source Iref and mirror current source Is1 and Is2 thereof.Mirror current source Is1 includes multiple current source I10 to I1n and multiple switch S10 to S1n, multiple first branch roads that composition is connected in parallel, and each first branch road includes switch and the current source being serially connected, for providing the compensation electric current of first direction.Mirror current source Is2 includes multiple current source I20 to I2n and multiple switch S20 to S2n, multiple second branch roads that composition is connected in parallel, and each second branch road includes switch and the current source being serially connected, for providing the compensation electric current of second direction.The electric current of first direction is the electric current for injecting to outside, and the electric current of second direction is the electric current drawn from outside.
In mirror current source Is1, by by the selected switch Guan Bi of multiple switch S10 to S1n, other switch off, it is possible to obtain the injection current of required size.In mirror current source Is2, by by multiple switch S20 to S2n selected switch Guan Bi, other switch off, it is possible to obtain required size draw electric current.
Should be noted that, in this article, the relational terms of such as first and second or the like is used merely to separate an entity or operation with another entity or operating space, and not necessarily requires or imply the relation or sequentially that there is any this reality between these entities or operation.And, term " includes ", " comprising " or its any other variant are intended to comprising of nonexcludability, so that include that the process of a series of key element, method, article or equipment not only include those key elements, but also include other key elements being not expressly set out, or also include the key element intrinsic for this process, method, article or equipment.In the case of there is no more restriction, statement " including ... " key element limited, it is not excluded that there is also other identical element in including the process of described key element, method, article or equipment.
According to embodiment of the present utility model as described above, these embodiments do not have all of details of detailed descriptionthe, are not intended to the specific embodiment that this utility model is only described yet.Obviously, as described above, can make many modifications and variations.These embodiments are chosen and specifically described to this specification, is to preferably explain principle of the present utility model and actual application, so that skilled artisan can utilize this utility model and the amendment on the basis of this utility model to use well.This utility model is only limited by claims and four corner thereof and equivalent.
Claims (18)
1. a signal processing circuit, it is characterised in that including:
Signal source, is used for providing source signal；
Amplifier, is connected with described signal source, is amplified described source signal；
Zeroing circuit, is connected with described amplifier, compensates the signal after amplifying；
Analog-digital converter, is connected with described amplifier and described zeroing circuit, and the signal after described compensation is transformed into digital signal；And
Digital signal processor, is connected with described analog-digital converter, for described digital signal is carried out calculation process,
Wherein, described zeroing circuit is connected to the outfan of described amplifier and provides at the outfan of amplifier and compensate electric current, thus suppresses null offset and the null offset of described amplifier of described signal source.
Signal processing circuit the most according to claim 1, it is characterised in that described compensation electric current is applied the output impedance to described amplifier out by described zeroing circuit, to raise or to drag down the current potential of outfan.
Signal processing circuit the most according to claim 1, it is characterised in that described signal source includes that sensor, described source signal are sensor signals.
Signal processing circuit the most according to claim 3, it is characterised in that described signal source includes that Wheatstone bridge, described sensor are positioned at least one brachium pontis of described Wheatstone bridge.
Signal processing circuit the most according to claim 3, it is characterised in that described sensor includes the sensor element sensitive at least one physical quantity in temperature, pressure, load, strain, acceleration, displacement.
Signal processing circuit the most according to claim 1, it is characterised in that described amplifier has outfan, thus provides the output signal of amplifier at described outfan.
Signal processing circuit the most according to claim 6, it is characterised in that described zeroing circuit has for providing the outfan compensating electric current, and the outfan of described zeroing circuit is connected with the outfan of described amplifier.
Signal processing circuit the most according to claim 7, it is characterised in that when positive polarity drift voltage, described zeroing circuit draws electric current from the outfan of described amplifier,
When negative polarity drift voltage, described zeroing circuit is to the outfan injection current of described amplifier.
Signal processing circuit the most according to claim 1, it is characterized in that, described amplifier has the first outfan and the second outfan, described first outfan is hot end, described second outfan is cold end, thus provides the output signal of amplifier between described first outfan and described second outfan.
Signal processing circuit the most according to claim 9, it is characterized in that, described zeroing circuit has the first outfan being respectively configured to provide the first compensation electric current and the second outfan providing the second compensation electric current, first outfan of described zeroing circuit is connected with the first outfan of described amplifier, and the second outfan of described zeroing circuit is connected with the second outfan of described amplifier.
11. signal processing circuits according to claim 10, it is characterised in that when positive polarity drift voltage, described zeroing circuit draws electric current from the first outfan of described amplifier, or to the second outfan injection current of described amplifier,
When negative polarity drift voltage, described zeroing circuit is to the first outfan injection current of described amplifier, or draws electric current from the second outfan of described amplifier.
12. signal processing circuits according to claim 11, it is characterised in that described zeroing voltage includes:
At least one current source；And
At least one switch, is connected in series with a current source at least one current source described respectively,
At least one current source described provides described compensation electric current via at least one switch described.
13. signal processing circuits according to claim 12, it is characterised in that also include: controller, described controller is connected with described zeroing circuit, for controlling size of current and the action of at least one switch described of at least one current source described.
14. signal processing circuits according to claim 12, it is characterized in that, at least one current source described includes that first to fourth current source, at least one switch described include first to fourth switch, described first to fourth switch is connected in series with described first to fourth current source respectively
Wherein, described first current source is connected to the first outfan of described amplifier via described first switch, for providing the electric current of first direction when described first switch Guan Bi,
Described second current source is connected to the second outfan of described amplifier via described second switch, for providing the electric current of first direction when described second switch closes,
Described 3rd current source is connected to the first outfan of described amplifier via described 3rd switch, for providing the electric current of second direction when described 3rd switch Guan Bi,
Described 4th current source is connected to the second outfan of described amplifier via described 4th switch, for providing the electric current of second direction when described 4th switch Guan Bi,
The electric current of described first direction is for the outside injection current of described zeroing circuit, and the electric current of described second direction is for drawing electric current from the outside of described zeroing circuit.
15. signal processing circuits according to claim 14, it is characterised in that described zeroing circuit obtains the compensation electric current of different directions by selecting different switches.
16. signal processing circuits according to claim 14, it is characterised in that described zeroing circuit obtains different size of compensation voltage by the size of current of regulation current source.
17. signal processing circuits according to claim 12, it is characterised in that at least one current source described includes respectively:
Reference current source；And
First mirror current source of described reference current source and the second mirror to current source,
Wherein, described first mirror current source includes the first branch road of multiple parallel connection, each first branch road includes the first electron current source that is serially connected and son the first switch, described second mirror current source includes that the second branch road of multiple parallel connection, each second branch road include the second electron current source that is serially connected and the second son switch.
18. signal processing circuits according to claim 17, it is characterised in that at least one current source described obtains the compensation electric current of different directions and/or size by selecting different son switches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521142129.2U CN205450659U (en) | 2015-12-31 | 2015-12-31 | Signal processing circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201521142129.2U CN205450659U (en) | 2015-12-31 | 2015-12-31 | Signal processing circuit |
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| CN205450659U true CN205450659U (en) | 2016-08-10 |
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| CN201521142129.2U Active CN205450659U (en) | 2015-12-31 | 2015-12-31 | Signal processing circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105446234A (en) * | 2015-12-31 | 2016-03-30 | 杭州士兰微电子股份有限公司 | Signal processing circuit and method |
| CN106441403A (en) * | 2016-09-19 | 2017-02-22 | 苏州戎维邦信息技术有限公司 | Method for zeroing initial null voltage of bridge sensor |
| CN113483754A (en) * | 2021-07-06 | 2021-10-08 | 重庆多融科技有限公司 | Accelerometer signal processing system and method for inertial navigation system |
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2015
- 2015-12-31 CN CN201521142129.2U patent/CN205450659U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105446234A (en) * | 2015-12-31 | 2016-03-30 | 杭州士兰微电子股份有限公司 | Signal processing circuit and method |
| CN106441403A (en) * | 2016-09-19 | 2017-02-22 | 苏州戎维邦信息技术有限公司 | Method for zeroing initial null voltage of bridge sensor |
| CN106441403B (en) * | 2016-09-19 | 2019-03-08 | 苏州戎维邦信息技术有限公司 | Bridge type magnetic sensor initial zero position voltage adjusting zero method |
| CN113483754A (en) * | 2021-07-06 | 2021-10-08 | 重庆多融科技有限公司 | Accelerometer signal processing system and method for inertial navigation system |
| CN113483754B (en) * | 2021-07-06 | 2023-02-03 | 重庆多融科技有限公司 | Accelerometer signal processing system and method for inertial navigation system |
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