CN102769435A - Differential amplifying circuit capable of automatically adjusting amplification factor - Google Patents
Differential amplifying circuit capable of automatically adjusting amplification factor Download PDFInfo
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- CN102769435A CN102769435A CN2011101161628A CN201110116162A CN102769435A CN 102769435 A CN102769435 A CN 102769435A CN 2011101161628 A CN2011101161628 A CN 2011101161628A CN 201110116162 A CN201110116162 A CN 201110116162A CN 102769435 A CN102769435 A CN 102769435A
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Abstract
The invention discloses a differential amplifying circuit capable of automatically adjusting amplification factor, belonging to the differential amplifying circuit. The differential amplifying circuit comprises a differential signal input end 1, a voltage output end 2, a direct current bias 5, a differential amplifying circuit 3 and an active filter circuit 4. The connection relationship is that the differential signal input end 1 receives a differential signal and transfers the differential signal to the differential amplifying circuit 3 with no difference; the direct current bias 5 outputs a constant bias voltage signal Vb; a control signal input end 19 receives a control signal which is output by the control end and transfers the control signal to the differential amplifying circuit 3; the output end of the differential amplifying circuit 3 is connected with the input end of the active filter circuit 4; the amplifying circuit amplifies a useful signal in the difference value of a V1 and a V2; a V3 is processed by the active low-pass filter circuit 4 to obtain a voltage signal V4; the voltage output end 2 transfers the voltage signal V4 which is output by the active low-pass filter circuit 4 with no difference. The differential amplifying circuit has the advantage of detecting a weak differential signal and is capable of automatically changing the amplification factor according to the input differential signal.
Description
Technical field
The present invention relates to a kind of differential amplifier circuit of semiconductor integrated circuit, a kind of specifically differential amplifier circuit that can have automatic adjusting multiplication factor.
Background technology
Differential amplifier circuit utilizes the symmetry and the negative feedback of circuit parameter, stablizes quiescent point effectively, is notable feature to amplify difference mode signal inhibition common-mode signal, is widely used in the input stage of direct-coupled circuit and measuring circuit.But the differential amplifier circuit complex structure, analyze loaded down with trivial detailsly, particularly it has different analytical methods to difference-mode input and common mode input signal, indigestion, thereby be the difficult point in the Analog Electronics Technique always.Differential amplifier circuit: by the I/O mode branch: have the output of both-end input both-end, both-end to import four types of single-ended output, the output of single-ended input both-end and the single-ended outputs of single-ended input.By the degenerative form branch of common mode: two kinds in the circuit that typical circuit and emitter-base bandgap grading band constant-current source are arranged.Existing differential amplifier circuit temporarily can not satisfy following advantage: the differential signal that can detect faint several microvolts; The size that multiplication factor can be followed the differential signal of input changes automatically; Integrated LPF and voltage follow function; Help to improve the load-carrying ability of circuit; Allow the differential signal wide ranges of input, not only guaranteed the dynamic range of differential amplifier circuit, and improved the circuit carrying load ability; Guarantee that the electric current that flows into load is unlikely to damage load; This differential amplifier circuit is influenced by ambient temperature less, is highly suitable for the big occasion of environmental temperature fluctuation.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can regulate the differential amplifier circuit of multiplication factor automatically, this structure can detect the differential signal of faint several microvolts; The size that multiplication factor can be followed the differential signal of input changes automatically; Integrated LPF and voltage follow function; Help improve the load-carrying ability of circuit; Allow the differential signal wide ranges of input, not only guaranteed the dynamic range of differential amplifier circuit, and improved the circuit carrying load ability; Guarantee that the electric current that flows into load is unlikely to damage load.
According to first aspect present invention; Provide a kind of and can regulate the differential amplifier circuit of multiplication factor automatically; Comprise: differential signal input, voltage output end, direct current biasing, it is characterized in that this circuit also comprises the differential amplifier circuit active filter circuit; Annexation between each circuit is: the differential signal input receives differential signal, and differential signal indifference strange land is passed to differential amplifier circuit; The biasing voltage signal that direct current biasing output is constant; Signal input end receives the control signal from control end output, and control signal is passed to differential amplifier circuit, and this control signal is used for controlling the multiplication factor of differential amplifier circuit; Differential amplifier circuit is to amplifying from the signal of telecommunication of differential signal input is poor with it; The output of differential amplifier circuit links to each other with the input of active low-pass filter circuit; Amplifying circuit is amplifying the useful signal in V1 and the V2 difference; High-frequency noise in this difference also is exaggerated simultaneously; The effect of active low-pass filter circuit is the high-frequency noise that suppresses among the V3; V3 obtains voltage signal V4 behind active low-pass filter circuit, the passband multiplication factor of active low-pass filter circuit is 1, promptly only plays the effect of voltage follow; The voltage output end indifference transmits the voltage signal V4 of active low-pass filter circuit output.
Said differential amplifier circuit comprises: differential signal input, proportion resistor, feedback resistance sequence, multichannel are selected operating voltage, signal ground and the voltage signal V3 of electronic switch, operational amplifier, power filtering capacitor, operational amplifier.Physical connection relation between them is: one of them terminal of differential signal input is connected with proportion resistor, and another terminal links to each other with the in-phase input end of operational amplifier; Proportion resistor is between the inverting input of differential signal input and operational amplifier; The feedback resistance sequence is made up of a plurality of resistance parallel connections; And each resistance all selects the way switch in the electronic switch to connect with multichannel; Single feedback resistance is connected the branch road that constitutes between operational amplifier output terminal and its inverting input with electronic switch; Multichannel is selected the break-make of the arbitrary way switch in the electronic switch, the control of suspension control signal Vc.When Vc1 was high level, one-way switch S1-D1 connected, otherwise broke off; When Vc2 was high level, one-way switch S2-D2 connected, otherwise broke off; When Vc3 was high level, one-way switch S3-D3 connected, otherwise broke off; When Vc4 was high level, one-way switch S4-D4 connected, otherwise broke off; Power filtering capacitor is between the supply power voltage and signal ground of operational amplifier.
Said two biasing resistors, supply voltage and signal ground constitute bias loop; And two biasing resistor series connection; The resistance of one of them biasing resistor is 4 times of another biasing resistor; The voltage at biasing resistor two ends is direct current biasing output Vb, and direct current biasing is exported between proportion resistor and differential signal input.
Said differential amplifier circuit is to amplifying from the signal of telecommunication V1 of differential signal input and the difference of V2; Voltage signal Vb to direct current biasing output does not amplify; Vb is the part of differential amplifier circuit output voltage signal V3, and the Vb linear superposition is on the voltage signal of differential amplifier circuit output.
Said active low-pass filter circuit comprises that operating voltage, shunt capacitance, the current-limiting resistance of RC network, operational amplifier, operational amplifier formed and signal ground; Physical connection relation between them is: RC network is composed in series by two single order RC branch roads, and the input of RC network links to each other with the output of operational amplifier, and the output of RC network links to each other with the in-phase input end of operational amplifier; The reverse input end of operational amplifier links to each other with the output of self, constitutes voltage follower, and current-limiting resistance is between the output and voltage output end of operational amplifier, and supply power voltage links to each other with the power input of operational amplifier; Shunt capacitance is between supply power voltage and signal ground.
Said resistance is the metal film precision resistance, and precision is 0.1%, its Standard resistance range at 1 kilohm between 1 megohm.
Said resistance is the metal film precision resistance, and precision is 0.1%, its Standard resistance range at 1 kilohm between 1 megohm.
Relation between each resistance in the said feedback resistance sequence is that multiple increases progressively relation, and the multiple scope that wherein increases progressively is between 2 to 10 times.
The differential signal scope of said permission input is between 1 microvolt to 4.8 volt.
Compared with prior art have the following advantages, can detect the differential signal of faint several microvolts; The size that multiplication factor can be followed the differential signal of input changes automatically; Integrated LPF and voltage follow function; Help improve the load-carrying ability of circuit; Allow the differential signal wide ranges of input, not only guaranteed the dynamic range of differential amplifier circuit, and improved the circuit carrying load ability; Guarantee that the electric current that flows into load is unlikely to damage load.
Description of drawings
Fig. 1 is a kind of module diagram that can regulate the differential amplifier circuit of multiplication factor automatically of the present invention;
Fig. 2 is the circuit diagram of differential amplifier circuit in a kind of differential amplifier circuit that can regulate multiplication factor automatically of the present invention;
Fig. 3 is the circuit diagram of active low-pass filter circuit in a kind of differential amplifier circuit that can regulate multiplication factor automatically of the present invention.
Embodiment
, should be appreciated that following illustrated preferred embodiment only is used for explanation and explains the present invention, and be not used in qualification the present invention a preferred embodiment of the present invention will be described in detail below in conjunction with accompanying drawing.
Embodiment 1, and Fig. 1 has shown the module diagram that can regulate the differential amplifier circuit of multiplication factor automatically of the present invention;
As shown in Figure 1: as a kind ofly can to regulate the differential amplifier circuit of multiplication factor automatically; Comprise: differential signal input 1, voltage output end 2, direct current biasing 5, it is characterized in that this circuit also comprises differential amplifier circuit 3 active filter circuits 4; Annexation between each circuit is: differential signal input 1 receives differential signal, and differential signal indifference strange land is passed to differential amplifier circuit 3; The constant biasing voltage signal Vb of direct current biasing 5 outputs; Signal input end 19 receives the control signal of exporting from control end, and control signal is passed to differential amplifier circuit, and this control signal is used for controlling the multiplication factor of differential amplifier circuit; 3 pairs of differential amplifier circuits amplify from the signal of telecommunication V1 of differential signal input 1 and the difference of V2; The output of differential amplifier circuit 3 links to each other with the input of active low-pass filter circuit 4; Amplifying circuit is amplifying the useful signal in V1 and the V2 difference; High-frequency noise in this difference also is exaggerated simultaneously; The effect of active low-pass filter circuit 4 is the high-frequency noises that suppress among the V3; V3 obtains voltage signal V4 behind active low-pass filter circuit 4, the passband multiplication factor of active low-pass filter circuit is 1, promptly only plays the effect of voltage follow; Voltage output end 2 indifferences transmit the voltage signal V4 of active low-pass filter circuit 4 outputs.
As shown in Figure 2: as a kind ofly can to regulate the differential amplifier circuit of multiplication factor automatically; It is characterized in that: said differential amplifier circuit comprises: differential signal input 1, proportion resistor 10, feedback resistance sequence 6, multichannel are selected operating voltage 12, signal ground 13 and the voltage signal V3 of electronic switch 7, operational amplifier 11, power filtering capacitor 12, operational amplifier.Physical connection relation between them is: one of them terminal of differential signal input 1 is connected with proportion resistor 10, and another terminal links to each other with the in-phase input end of operational amplifier 11; Proportion resistor 10 is between the inverting input of differential signal input 1 and operational amplifier 11; Feedback resistance sequence 6 is made up of a plurality of resistance 6 ' parallel connections; And each resistance 6 ' all selects the way switch 7 ' in the electronic switch 7 to connect with multichannel; Single feedback resistance is connected the branch road that constitutes between operational amplifier 11 outputs and its inverting input with electronic switch; Multichannel is selected the break-make of the arbitrary way switch 7 ' in the electronic switch 7, the control of suspension control signal Vc.When Vc1 was high level, one-way switch S1-D1 connected, otherwise when breaking off Vc2 and being high level, one-way switch S2-D2 connects, otherwise when breaking off Vc3 and being high level, one-way switch S3-D3 connects, otherwise breaks off; When Vc4 was high level, one-way switch S4-D4 connected, otherwise broke off; Power filtering capacitor 12 is between the supply power voltage and signal ground 13 of operational amplifier 11.
As shown in Figure 2: as a kind ofly can to regulate the differential amplifier circuit of multiplication factor automatically; It is characterized in that: said biasing resistor 8, biasing resistor 9, supply voltage 14 and signal ground 13 constitute bias loops; Biasing resistor 8 and biasing resistor 9 series connection; The resistance of biasing resistor 8 is 4 times of biasing resistor 9, and the voltage at biasing resistor 9 two ends is direct current biasing output Vb, and direct current biasing is exported between proportion resistor 10 and differential signal input.
As shown in Figure 2: as a kind ofly can to regulate the differential amplifier circuit of multiplication factor automatically; It is characterized in that: 3 pairs of said differential amplifier circuits amplify from the signal of telecommunication V1 of differential signal input 1 and the difference of V2; Voltage signal Vb to direct current biasing 5 outputs does not amplify; Vb is the part of differential amplifier circuit output voltage signal V3, and the Vb linear superposition is on the voltage signal of differential amplifier circuit output.
As shown in Figure 3: as a kind ofly can to regulate the differential amplifier circuit of multiplication factor automatically; It is characterized in that: said active low-pass filter circuit comprises that operating voltage 16, shunt capacitance 13, the current-limiting resistance 18 of RC network 15, operational amplifier 17, operational amplifier 17 formed and signal ground 13; Physical connection relation between them is: RC network 15 is composed in series by two single order RC branch roads 15 ', and the input of RC network links to each other with the output of operational amplifier 11, and the output of RC network links to each other with the in-phase input end of operational amplifier 17; The reverse input end of operational amplifier 17 links to each other with the output of self, constitutes voltage follower, and current-limiting resistance R31 is between the output and voltage output end 2 of operational amplifier 17, and supply power voltage 16 links to each other with the power input of operational amplifier 17; Shunt capacitance 19 is between supply power voltage 16 and signal ground 13.
As shown in Figure 2: a kind ofly can regulate the differential amplifier circuit of multiplication factor automatically, it is characterized in that: said resistance is the metal film precision resistance, and precision is 0.1%, and its resistance is 1 kilohm.
As shown in Figure 3: a kind ofly can regulate the differential amplifier circuit of multiplication factor automatically, it is characterized in that: said resistance is the metal film precision resistance, and precision is 0.1%, and its resistance is 2 kilohms.
As shown in Figure 2: a kind ofly can regulate the differential amplifier circuit of multiplication factor automatically, it is characterized in that: the relation between each resistance in the said feedback resistance sequence 6 is that multiple increases progressively relation, and the multiple that wherein increases progressively is 8 times.
As shown in Figure 1: as a kind ofly can to regulate the differential amplifier circuit of multiplication factor automatically, it is characterized in that: the differential signal of said permission input is 4.8 volts.
As shown in Figure 1: as a kind ofly can to regulate the differential amplifier circuit of multiplication factor automatically; Comprise: differential signal input 1, voltage output end 2, direct current biasing 5, it is characterized in that this circuit also comprises differential amplifier circuit 3 active filter circuits 4; Annexation between each circuit is: differential signal input 1 receives differential signal, and differential signal indifference strange land is passed to differential amplifier circuit 3; The constant biasing voltage signal Vb of direct current biasing 5 outputs; Signal input end 19 receives the control signal of exporting from control end, and control signal is passed to differential amplifier circuit, and this control signal is used for controlling the multiplication factor of differential amplifier circuit; 3 pairs of differential amplifier circuits amplify from the signal of telecommunication V1 of differential signal input 1 and the difference of V2; The output of differential amplifier circuit 3 links to each other with the input of active low-pass filter circuit 4; Amplifying circuit is amplifying the useful signal in V1 and the V2 difference; High-frequency noise in this difference also is exaggerated simultaneously; The effect of active low-pass filter circuit 4 is the high-frequency noises that suppress among the V3; V3 obtains voltage signal V4 behind active low-pass filter circuit 4, the passband multiplication factor of active low-pass filter circuit is 1, promptly only plays the effect of voltage follow; Voltage output end 2 indifferences transmit the voltage signal V4 of active low-pass filter circuit 4 outputs.
As shown in Figure 2: as a kind ofly can to regulate the differential amplifier circuit of multiplication factor automatically; It is characterized in that: said differential amplifier circuit comprises: differential signal input 1, proportion resistor 10, feedback resistance sequence 6, multichannel are selected operating voltage 12, signal ground 13 and the voltage signal V3 of electronic switch 7, operational amplifier 11, power filtering capacitor 12, operational amplifier.Physical connection relation between them is: one of them terminal of differential signal input 1 is connected with proportion resistor 10, and another terminal links to each other with the in-phase input end of operational amplifier 11; Proportion resistor 10 is between the inverting input of differential signal input 1 and operational amplifier 11; Feedback resistance sequence 6 is made up of a plurality of resistance 6 ' parallel connections; And each resistance 6 ' all selects the way switch 7 ' in the electronic switch 7 to connect with multichannel; Single feedback resistance is connected the branch road that constitutes between operational amplifier 11 outputs and its inverting input with electronic switch; Multichannel is selected the break-make of the arbitrary way switch 7 ' in the electronic switch 7, the control of suspension control signal Vc.When Vc1 was high level, one-way switch S1-D1 connected, otherwise broke off; When Vc2 was high level, one-way switch S2-D2 connected, otherwise broke off; When Vc3 was high level, one-way switch S3-D3 connected, otherwise broke off; When Vc4 was high level, one-way switch S4-D4 connected, otherwise broke off; Power filtering capacitor 12 is between the supply power voltage and signal ground 13 of operational amplifier 11.
As shown in Figure 2: as a kind ofly can to regulate the differential amplifier circuit of multiplication factor automatically; It is characterized in that: said biasing resistor 8, biasing resistor 9, supply voltage 14 and signal ground 13 constitute bias loops; Biasing resistor 8 and biasing resistor 9 series connection; The resistance of biasing resistor 8 is 4 times of biasing resistor 9, and the voltage at biasing resistor 9 two ends is direct current biasing output Vb, and direct current biasing is exported between proportion resistor 10 and differential signal input.
As shown in Figure 2: as a kind ofly can to regulate the differential amplifier circuit of multiplication factor automatically; It is characterized in that: 3 pairs of said differential amplifier circuits amplify from the signal of telecommunication V1 of differential signal input 1 and the difference of V2; Voltage signal Vb to direct current biasing 5 outputs does not amplify; Vb is the part of differential amplifier circuit output voltage signal V3, and the Vb linear superposition is on the voltage signal of differential amplifier circuit output.
As shown in Figure 3: as a kind ofly can to regulate the differential amplifier circuit of multiplication factor automatically; It is characterized in that: said active low-pass filter circuit comprises that operating voltage 16, shunt capacitance 13, the current-limiting resistance 18 of RC network 15, operational amplifier 17, operational amplifier 17 formed and signal ground 13; Physical connection relation between them is: RC network 15 is composed in series by two single order RC branch roads 15 ', and the input of RC network links to each other with the output of operational amplifier 11, and the output of RC network links to each other with the in-phase input end of operational amplifier 17; The reverse input end of operational amplifier 17 links to each other with the output of self, constitutes voltage follower, and current-limiting resistance R31 is between the output and voltage output end 2 of operational amplifier 17, and supply power voltage 16 links to each other with the power input of operational amplifier 17; Shunt capacitance 19 is between supply power voltage 16 and signal ground 13.
As shown in Figure 2: a kind ofly can regulate the differential amplifier circuit of multiplication factor automatically, it is characterized in that: said resistance is the metal film precision resistance, and precision is 0.1%, and its resistance is 1 kilohm.
As shown in Figure 3: a kind ofly can regulate the differential amplifier circuit of multiplication factor automatically, it is characterized in that: said resistance is the metal film precision resistance, and precision is 0.1%, and its resistance is 5 kilohms.
As shown in Figure 2: a kind ofly can regulate the differential amplifier circuit of multiplication factor automatically, it is characterized in that: the relation between each resistance in the said feedback resistance sequence 6 is that multiple increases progressively relation, and the multiple scope that wherein increases progressively is 6 times.
As shown in Figure 1: as a kind ofly can to regulate the differential amplifier circuit of multiplication factor automatically, it is characterized in that: the differential signal of said permission input is 5 microvolts.
In sum, compared with prior art have the following advantages, compared with prior art have the following advantages, can detect the differential signal of faint several microvolts; The size that multiplication factor can be followed the differential signal of input changes automatically; Integrated LPF and voltage follow function; Help improve the load-carrying ability of circuit; Allow the differential signal wide ranges of input, not only guaranteed the dynamic range of differential amplifier circuit, and improved the circuit carrying load ability; Guarantee that the electric current that flows into load is unlikely to damage load.
Although preceding text specify the present invention, the invention is not restricted to this, those skilled in the art of the present technique can carry out various modifications according to principle of the present invention.Therefore, all modifications of doing according to the principle of the invention all are to be understood that to falling into protection scope of the present invention.
Claims (9)
1. can regulate the differential amplifier circuit of multiplication factor automatically for one kind; Comprise: differential signal input 1, voltage output end 2, direct current biasing 5, it is characterized in that this circuit also comprises differential amplifier circuit 3, active filter circuit 4; Annexation between each circuit is: differential signal input 1 receives differential signal, and differential signal indifference strange land is passed to differential amplifier circuit 3; The constant biasing voltage signal Vb of direct current biasing 5 outputs; Signal input end 19 receives the control signal of exporting from control end, and control signal is passed to differential amplifier circuit, and this control signal is used for controlling the multiplication factor of differential amplifier circuit; 3 pairs of differential amplifier circuits amplify from the signal of telecommunication V1 of differential signal input 1 and the difference of V2; The output of differential amplifier circuit 3 links to each other with the input of active low-pass filter circuit 4; Amplifying circuit is amplifying the useful signal in V1 and the V2 difference; High-frequency noise in this difference also is exaggerated simultaneously; The effect of active low-pass filter circuit 4 is the high-frequency noises that suppress among the V3; V3 obtains voltage signal V4 behind active low-pass filter circuit 4, the passband multiplication factor of active low-pass filter circuit 4 is 1, promptly only plays the effect of voltage follow; Voltage output end 2 indifferences transmit the voltage signal V4 of active low-pass filter circuit 4 outputs.
2. according to claim 1ly a kind ofly can regulate the differential amplifier circuit of multiplication factor automatically; It is characterized in that: said differential amplifier circuit comprises: differential signal input 1, proportion resistor 10, feedback resistance sequence 6, multichannel are selected operating voltage 12, signal ground 13 and the voltage signal V3 of electronic switch 7, operational amplifier 11, power filtering capacitor 12, operational amplifier; Physical connection relation between them is: one of them terminal of differential signal input 1 is connected with proportion resistor 10, and another terminal links to each other with the in-phase input end of operational amplifier 11; Proportion resistor 10 is between the inverting input of differential signal input 1 and operational amplifier 11; Feedback resistance sequence 6 is made up of the 6 ' parallel connection of a plurality of resistance, and each resistance 6 ' all with multichannel selection electronic switch 7 in a way switch 7 ' connect, power filtering capacitor 12 is between the supply power voltage and signal ground 13 of operational amplifier 11.
3. according to claim 2ly a kind ofly can regulate the differential amplifier circuit of multiplication factor automatically, it is characterized in that: said bias loop is to be made up of a plurality of biasing resistors and supply voltage, and is the series connection form between any two biasing resistors; And a biasing resistor is 2-6 times of another biasing resistor resistance.
4. according to claim 2ly a kind ofly can regulate the differential amplifier circuit of multiplication factor automatically; It is characterized in that: 3 pairs of said differential amplifier circuits amplify from the signal of telecommunication V1 of differential signal input 1 and the difference of V2; Voltage signal Vb to direct current biasing 5 outputs does not amplify, and the Vb linear superposition is on the voltage signal of differential amplifier circuit output.
5. according to claim 1ly a kind ofly can regulate the differential amplifier circuit of multiplication factor automatically; It is characterized in that: said active low-pass filter circuit comprises that operating voltage 16, shunt capacitance 13, the current-limiting resistance 18 of RC network 15, operational amplifier 17, operational amplifier 17 formed and signal ground 13; Wherein, the reverse input end of operational amplifier 17 links to each other with the output of self, constitutes voltage follower; Current-limiting resistance R31 is between the output and voltage output end 2 of operational amplifier 17, and supply power voltage 16 links to each other with the power input of operational amplifier 17; Shunt capacitance 19 is between supply power voltage 16 and signal ground 13.
6. according to claim 2ly a kind ofly can regulate the differential amplifier circuit of multiplication factor automatically, it is characterized in that: said resistance is the metal film precision resistance, and precision is 0.1%, its Standard resistance range at 1 kilohm between 1 megohm.
7. according to claim 5ly a kind ofly can regulate the differential amplifier circuit of multiplication factor automatically, it is characterized in that: said resistance is the metal film precision resistance, and precision is 0.1%, its Standard resistance range at 1 kilohm between 1 megohm.
8. according to claim 2ly a kind ofly can regulate the differential amplifier circuit of multiplication factor automatically, it is characterized in that: the relation between each resistance in the said feedback resistance sequence 6 is that multiple increases progressively relation, and the multiple scope that wherein increases progressively is between 2 to 10 times.
9. according to claim 1ly a kind ofly can regulate the differential amplifier circuit of multiplication factor automatically, it is characterized in that: the differential signal scope of said permission input is between 5 microvolts to 4.8 volt.
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| CN103337887B (en) * | 2013-06-25 | 2016-01-13 | 江苏新通达电子科技股份有限公司 | A kind of intelligent charger system and circuit |
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| CN106685367B (en) * | 2016-11-28 | 2023-10-20 | 中核核电运行管理有限公司 | High-performance signal processing module for nuclear power station reactor core nuclear testing system |
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Application publication date: 20121107 |