CN101187572A - Double-channel differential anti-interference current amplification circuit - Google Patents
Double-channel differential anti-interference current amplification circuit Download PDFInfo
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- CN101187572A CN101187572A CNA2007101911986A CN200710191198A CN101187572A CN 101187572 A CN101187572 A CN 101187572A CN A2007101911986 A CNA2007101911986 A CN A2007101911986A CN 200710191198 A CN200710191198 A CN 200710191198A CN 101187572 A CN101187572 A CN 101187572A
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Abstract
The invention discloses a double-channel differential anti-interference current amplifying circuit, which takes input ends of a first current-voltage converter and a second current-voltage converter as a first input end and a second input end thereof and takes reference voltage ends thereof as a first reference input end and a second reference input end, output ends of the first current-voltage converter and the second current-voltage converter are respectively connected with positive input ends of a first differential amplifier and a second differential amplifier, the first reference input end and the second reference input end are respectively connected with negative input ends of the first differential amplifier and the second differential amplifier, output ends of the first differential amplifier and the second differential amplifier are respectively connected with positive and negative or positive input ends of a secondary differential amplifier, and an output end of the secondary differential amplifier is an output end of the double-channel. The method can successfully measure the weak signals of the pico-ampere level under the condition of no shielding, can further improve the signal to noise ratio of the measurement when shielding exists, and can inhibit non-electrical common mode interference signals such as vibration, thermal drift and the like.
Description
Technical field
The present invention relates to the circuit that a kind of electric current amplifies, particularly a kind of double passage differential anti-jamming current amplification circuit that is applicable to that weak current is measured.
Background technology
The a lot of important electricity (for example tunnel current of scanning tunnel microscope, cardiogram, brain wave etc.) or the measurement of non-electricity (light, sound, pressure and pH value etc.) signal are finally all changed into the measurement of electric current and obtain higher measuring accuracy by circuit or sensor.It is more and more crucial that therefore the accurate measurement of the measurement of electric current, particularly weak current also becomes.Existing weak current measuring technique mainly comprises: transimpedance (transimpedance) amplifying circuit, integrating circuit (integrationcircuit), switch integration (switched integration) circuit, binary channels cross correlation (double channelcross-correlation) amplifying technique etc.These technology all have a common shortcoming: must use preferably that shield assembly stops extraneous various undesired signal (for example interference of 50HZ supply lines, mobile phone, radio signals etc.) to enter into metering circuit, amplify with its together measured circuit on the tested current signal otherwise undesired signal can be added to and cause measuring signal to noise ratio (S/N ratio) and reduce.This makes much is inconvenient to use the field survey of shield assembly to be difficult to obtain higher measuring accuracy.Even for the measurement of having used shield assembly, can not shield undesired signal fully usually, this can not bring up to the signal to noise ratio (S/N ratio) of metering circuit its possible mxm. equally.In addition, also can measure the generation appreciable impact as the interference of other non-electricity such as thermal drift and vibrating noise to weak current.
For this reason, the invention provides a kind of current measurement circuit that the external interference conversion of signals is become common-mode signal and utilize the difference amplification to be removed, and the final feeble signal that under the situation without any shielding, successfully measures skin peace magnitude for the first time.
Summary of the invention
The objective of the invention is for can do not shield or the unfavorable situation of shield effectiveness under obtain higher current measurement signal to noise ratio (S/N ratio) a kind of anti-jamming current amplification circuit be provided.
The present invention do not shield or the unfavorable situation of shield effectiveness under improve the technical scheme that the current measurement signal to noise ratio (S/N ratio) adopted and be:
A kind of double passage differential anti-jamming current amplification circuit of the present invention, comprise current-voltage converter and differential amplifier, it is characterized in that the input end of first and second current-voltage converters constitutes first and second input ends of described double passage differential anti-jamming current amplification circuit respectively, the reference voltage end of described first and second current-voltage converters constitutes first and second reference inputs of described double passage differential anti-jamming current amplification circuit respectively, and constructs described double passage differential anti-jamming current amplification circuit by one of following two kinds of connection methods:
(a) output terminal of described first and second current-voltage converters connects the positive input terminal of first and second differential amplifiers respectively, described first and second reference inputs connect the negative input end of first and second differential amplifiers respectively, the output terminal of described first and second differential amplifiers connects the positive and negative or negative positive input terminal of secondary differential amplifier respectively, and the output terminal of this secondary differential amplifier constitutes the output terminal of described double passage differential anti-jamming current amplification circuit;
(b) output terminal of described first and second current-voltage converters connects the negative input end of first and second differential amplifiers respectively, described first and second reference inputs connect the positive input terminal of first and second differential amplifiers respectively, the output terminal of described first and second differential amplifiers connects the positive and negative or negative positive input terminal of secondary differential amplifier respectively, and the output terminal of this secondary differential amplifier constitutes the output terminal of described double passage differential anti-jamming current amplification circuit.
Between the input end of the output terminal of described first differential amplifier and the secondary differential amplifier of its correspondence and the voltage amplifier that can set up Gain Adjustable between the input end of the secondary differential amplifier of the output terminal of described second differential amplifier and its correspondence.
Described first and second current-voltage converters are transimpedance amplifier, integrator, switch integrator.
A kind of double passage differential anti-jamming current amplification circuit of the present invention, comprise current-voltage converter and differential amplifier, it is characterized in that the input end of first and second current-voltage converters constitutes the first input end and second input end of described double passage differential anti-jamming current amplification circuit respectively, the reference voltage end of described first current-voltage converter constitutes the reference input of described double passage differential anti-jamming current amplification circuit, the reference voltage end ground connection of described second current-voltage converter, the output terminal of described first current-voltage converter and its reference input connect the positive-negative input end of this first differential amplifier respectively, the output terminal of the output terminal of this first differential amplifier and described second current-voltage converter connects the positive and negative or negative positive input terminal of secondary differential amplifier respectively, and the output terminal of this secondary differential amplifier constitutes the output terminal of described double passage differential anti-jamming current amplification circuit.
Between the input end of the output terminal of described first differential amplifier and the secondary differential amplifier of its correspondence and the voltage amplifier that can set up Gain Adjustable between the input end of the secondary differential amplifier of the output terminal of described second current-voltage converter and its correspondence.
Described first and second current-voltage converters are transimpedance amplifier, integrator, switch integrator.
The principle of work of double passage differential anti-jamming current amplification circuit of the present invention is:
The input end of the first current-voltage converter IVC1 and the second current-voltage converter IVC2 constitutes the first input end Vin1 and the second input end Vin2 of double passage differential anti-jamming current amplification circuit of the present invention respectively, and the reference voltage end V2 of the reference voltage end V1 of IVC1 and IVC2 constitutes the first reference input V1 and the second reference input V2 of double passage differential anti-jamming current amplification circuit of the present invention respectively, the output of IVC1 and IVC2 connects the positive input terminal of the first differential amplifier DA1 and the second differential amplifier DA2 respectively, the described first reference input V1 and the second reference input V2 connect the negative input end of DA1 and DA2 respectively, the output of DA1 and DA2 connects the positive-negative input end of secondary differential amplifier DA3 respectively, and the output terminal of DA3 constitutes the output end vo ut of double passage differential anti-jamming current amplification circuit of the present invention.
During work, the two ends of measured device DUT meet the first input end Vin1 and the second input end Vin2 of double passage differential anti-jamming current amplification circuit of the present invention respectively, produce measured current I thereby two reference input V1 of double passage differential anti-jamming current amplification circuit of the present invention and V2 are used for applying bias voltage to DUT in DUT
XIf I
XFlow into described first input end Vin1, it is the voltage signal V (I of reference voltage by the first reference input current potential V1 that IVC1 converts to double passage differential anti-jamming current amplification circuit of the present invention
X), that is, the output voltage of IVC1 is V
IVC1=V1-V (I
X).Convenient for discussing, the gain of establishing each differential amplifier is 1, actually can be arbitrary value and do not produce materially affect, thereby DA1 is output as V
DA1=V
IVC1-V1=-V (I
X); On the other hand, I
XSince flow into first input end Vin1, it just must flow out from the second input end Vin2, that is: the electric current of second input end Vin2 inflow is-I
XSo IVC2 is output as V
IVC2=V2-V (I
X).If V is (I
XV (the I of)=-
X), i.e. V
IVC2=V2+V (I
X), thereby DA2 is output as V
DA2=V
IVC2-V2=V (I
X); At last, be output as V from DA3
DA1-V
DA2=-2V (I
X), the output signal Vout of Here it is double passage differential anti-jamming current amplification circuit of the present invention.This signal still is to I
XA measurement, but the various undesired signal that enters into measurement from the external world is all common-mode signal, is finally eliminated by each differential amplifier.
Our experimental result shows, if under the situation that does not have shielding only with the IVC1 of the non-difference of single channel be the current noise that do not detect 10 megohm resistance (1 skin is pacified magnitude, promptly 10
-12Ampere), but after having used double passage differential anti-jamming current amplification circuit of the present invention, even do not shield also energy measurement fully to the current noise of 10 megohm resistance.Measurement result is seen Fig. 3, and the horizontal ordinate among the figure is the subduplicate inverse of measured resistance resistance Rx: 1/sqrt (Rx), and ordinate is the root mean square (is unit with the ampere) of the noise current of Rx generation.According to the Johnson formula of resistor current noise, the current noise of resistance is proportional to the subduplicate inverse of its resistance.Fig. 3 shows that the experimental data that measures under the unshielded condition very well provides this proportional relation, the linear correlation coefficients R that its linear fit provides
2Up to 99.89%, and general R
2Just being considered to linear correlation greater than 80% sets up.When Fig. 3 also demonstrates Rx up to 10 megohms (current noise is the feeble signal of skin peace magnitude), linear relationship is still set up, after double passage differential anti-jamming current amplification circuit of the present invention has been used in this explanation, even still can measure the feeble signal of skin peace magnitude under the condition that does not have shielding fully, this is that prior art is not accomplished.
The positive and negative input of DA1 and the positive and negative input of DA2 can be exchanged simultaneously in the foregoing circuit, that is: the output of IVC1 and IVC2 connects the negative input end of DA1 and DA2 respectively, the first reference input V1 and the second reference input V2 connect the positive input terminal of DA1 and DA2 respectively, the result can only make and the Vout reversion not produce materially affect.
The positive and negative input of DA3 is also exchanged in the foregoing circuit, i.e. the output of DA1 and DA2 connects the negative positive input terminal of DA3 respectively, and the result also can only make the Vout reversion, does not produce materially affect.
During operation, the gain that can regulate DA1 and DA2 itself does not appear among the output signal Vout undesired signal fully.The voltage amplifier that all can set up Gain Adjustable in the foregoing circuit before two of DA3 input ends makes that in order to adjusting the undesired signal in the positive and negative input signal of DA3 is equal fully, thereby undesired signal is not appeared among the output signal Vout fully.
The output V of IVC1 in the foregoing circuit
IVC1Output V with IVC2
IVC2Depend on the first reference input current potential V1 and the second reference input current potential V2, thus to use DA1 and DA2 with V1 and V2 respectively from V
IVC1And V
IVC2In deduction, and then make and do not occur and measured current I among the output signal Vout of DA3
XIrrelevant V1 and V2.So if V1 or V2 ground connection (being zero potential), its pairing DA1 or DA2 just can remove.
IVC1 in the foregoing circuit and IVC2 must satisfy following two conditions could make double passage differential anti-jamming current amplification circuit operate as normal of the present invention: the first, can be with measured current I
XConvert voltage signal V (I to
X), second, satisfy V (I
XV (the I of)=-
X).The current-voltage converter that satisfies these two conditions all can be used as IVC1 of the present invention and IVC2, for example: transimpedance amplifier, integrator, switch integrator etc.
Compared with the prior art, beneficial effect of the present invention is embodied in:
(1) successfully measure other feeble signal of skin peace level for the first time under the situation without any shielding, by our experiment confirm, experimental result is seen Fig. 3 to this point, and this is that prior art is not accomplished.
(2) when being arranged, shielding also can further improve the measurement signal to noise ratio (S/N ratio).
(3) can suppress other common mode interference signal, for example: vibrations interference, thermal drift etc.
(4) voltage noise on the bias voltage and current noise are to measuring almost not influence, because bias voltage is added in reference input, the noise signal on it can further not amplified by current-voltage converter.
Description of drawings
Fig. 1 is that the present invention is two with reference to imported double passage differential anti-jamming current amplification circuit basic structure synoptic diagram.
Fig. 2 is that the present invention is single with reference to imported double passage differential anti-jamming current amplification circuit basic structure synoptic diagram.
Fig. 3 uses resistor current noise that double passage differential anti-jamming current amplification circuit of the present invention the measures variation relation with resistance under the situation that does not have shielding fully, horizontal ordinate among the figure is the subduplicate inverse of measured resistance resistance Rx: 1/sqrt (Rx), ordinate is the root mean square (is unit with the ampere) of the noise current of Rx generation, the linear correlation coefficients R that its linear fit provides
2Up to 99.89%, be strong linear correlation, meet finely with the Johnson formula, even Rx is (current noise is the feeble signal of skin peace magnitude) during up to 10 megohms, linear relationship is still set up, after double passage differential anti-jamming current amplification circuit of the present invention had been used in this explanation, even still can measure the feeble signal of skin peace magnitude under the condition that does not have shielding fully, this was that prior art is not accomplished.
Number in the figure: Vin1 first input end, Vin2 second input end, V1 first reference input, V2 second reference input, IVC1 first current-voltage converter, V
IVC1The output of first current-voltage converter, IVC2 second current-voltage converter, V
IVC2The output of second current-voltage converter, DA1 first differential amplifier, V
DA1The output of first differential amplifier, DA2 second differential amplifier, V
DA2The output of second differential amplifier, DA3 level differential amplifier, Vout output terminal.
Below by embodiment, the structure accompanying drawing is further described the present invention
Embodiment
Embodiment 1: the present invention is two with reference to imported double passage differential anti-jamming current amplification circuit
Referring to Fig. 1, the input end Vin2 of the input end Vin1 of the first current-voltage converter IVC1 and the second current-voltage converter IVC2 constitutes the first input end Vin1 and the second input end Vin2 of double passage differential anti-jamming current amplification circuit of the present invention respectively, the reference voltage end V1 of IVC1 and the reference voltage end V2 of IVC2 constitute the first reference input V1 and the second reference input V2 of double passage differential anti-jamming current amplification circuit of the present invention, the output V of IVC1 respectively
IVC1Output V with IVC2
IVC2Connect the positive input terminal of the first differential amplifier DA1 and the second differential amplifier DA2 respectively, V1 and V2 connect the negative input end of DA1 and DA2 respectively, the output V of DA1
DA1Output V with DA2
DA2Connect the positive-negative input end of secondary differential amplifier DA3 respectively, the output end vo ut of this DA3 constitutes the output end vo ut of double passage differential anti-jamming current amplification circuit of the present invention.
During work, the two ends of measured device DUT meet the first input end Vin1 and the second input end Vin2 of double passage differential anti-jamming current amplification circuit of the present invention respectively, produce measured current I within it thereby two reference input V1 of double passage differential anti-jamming current amplification circuit of the present invention and V2 are used for applying bias voltage to DUT
XIf I
XFlow into Vin1, it is converted to the first reference input current potential V1 by the first current-voltage converter IVC1 is the voltage signal V (I of reference voltage
X), that is, IVC1 is output as V
IVC1=V1-V (I
X).If the gain of each differential amplifier is 1 (actual can be arbitrary value and do not produce materially affect), thereby the first differential amplifier DA1 is output as V
DA1=V
IVC1-V1=-V (I
X); On the other hand, I
XSince flow into Vin1, it just must flow out from Vin2, that is: the electric current that flows into to Vin2 is-I
XSo the second current-voltage converter IVC2 is output as V
IVC2=V2-V (I
X).If V is (I
XV (the I of)=-
X), i.e. V
IVC2=V2+V (I
X), thereby the second differential amplifier DA2 is output as V
DA2=V
IVC2-V2=V (I
X); At last, be output as V from secondary differential amplifier DA3
DA1-V
DA2=-2V (I
X), the output signal Vout of Here it is double passage differential anti-jamming current amplification circuit of the present invention.This signal still is to I
XA measurement, but the various undesired signal that enters into metering circuit from the external world is all common-mode signal, is finally eliminated by each differential amplifier.Our experimental result shows, if only the IVC1 with the non-difference of single channel is the current noise (1 skin peace magnitude) that does not detect 10 megohm resistance under the situation that does not have shielding, but after having used double passage differential anti-jamming current amplification circuit of the present invention, even do not shield also energy measurement fully to the current noise (see figure 3) of 10 megohm resistance.
The positive and negative input of the first differential amplifier DA1 and the positive and negative input of the second differential amplifier DA2 can be exchanged simultaneously in the foregoing circuit, that is: the output terminal of IVC1 and IVC2 connects the negative input end of DA1 and DA2 respectively, the first reference input V1 and the second reference input V2 connect the positive input terminal of DA1 and DA2 respectively, the result can only make and the output signal Vout reversion of double passage differential anti-jamming current amplification circuit of the present invention not produce materially affect.The positive and negative input of secondary differential amplifier DA3 also can be exchanged in the foregoing circuit, and the result only makes the Vout reversion, does not produce materially affect.
During operation, the gain that can regulate DA1 and DA2 itself does not appear among the output signal Vout undesired signal fully.The voltage amplifier that all can set up Gain Adjustable before two input ends of DA3 makes that in order to adjusting the undesired signal in the positive and negative input signal of DA3 is equal fully, thereby undesired signal is not appeared among the output signal Vout of DA3 fully.
Embodiment 2: the present invention is single with reference to imported double passage differential anti-jamming current amplification circuit
The output V of the first current-voltage converter IVC1 in the foregoing description 1
DA1Output V with the second current-voltage converter IVC2
DA2Be depend on double passage differential anti-jamming current amplification circuit of the present invention first with reference to input V1 and second with reference to input V2, so to use the first differential amplifier DA1 and the second differential amplifier DA2 with V1 and V2 respectively from V
DA1And V
DA2In deduction, and then make and do not occur and measured current I among the output signal Vout of secondary differential amplifier DA3
XIrrelevant V1 and V2.So if V1 or V2 ground connection (being zero potential), its pairing first differential amplifier DA1 or the second differential amplifier DA2 just can remove, constitute singly with reference to imported double passage differential anti-jamming current amplification circuit, see Fig. 2.
The positive and negative input of secondary differential amplifier DA3 also can be exchanged in the foregoing circuit, and the result only makes the Vout reversion, does not produce materially affect.During operation, the gain that can regulate DA1 itself does not appear among the output signal Vout undesired signal fully.The voltage amplifier that also all can set up Gain Adjustable before two input ends of DA3 makes that in order to adjusting the undesired signal in the positive and negative input signal of DA3 is equal fully, thereby undesired signal is not appeared among the output signal Vout of DA3 fully.
Embodiment 3: the current-voltage converter in the double passage differential anti-jamming current amplification circuit of the present invention
Current-to-voltage convertor IVC1 among the foregoing description 1-2 and IVC2 must satisfy following two conditions could make operate as normal of the present invention: the first, with measured current I
XConvert voltage signal V (I to
X), second, V (I
XV (the I of)=-
X).The current-voltage converter that satisfies these two conditions all can be used as IVC1 of the present invention and IVC2, for example: transimpedance amplifier, integrator, switch integrator etc.
Claims (6)
1. double passage differential anti-jamming current amplification circuit, comprise current-voltage converter and differential amplifier, it is characterized in that the input end of first and second current-voltage converters constitutes the first input end and second input end of described double passage differential anti-jamming current amplification circuit respectively, the reference voltage end of described first and second current-voltage converters constitutes first and second reference inputs of described double passage differential anti-jamming current amplification circuit respectively, and constructs described double passage differential anti-jamming current amplification circuit by one of following two kinds of connection methods:
(a) output terminal of described first and second current-voltage converters connects the positive input terminal of first and second differential amplifiers respectively, described first and second reference inputs connect the negative input end of first and second differential amplifiers respectively, the output terminal of described first and second differential amplifiers connects the positive and negative or negative positive input terminal of secondary differential amplifier respectively, and the output terminal of this secondary differential amplifier constitutes the output terminal of described double passage differential anti-jamming current amplification circuit;
(b) output terminal of described first and second current-voltage converters connects the negative input end of first and second differential amplifiers respectively, described first and second reference inputs connect the positive input terminal of first and second differential amplifiers respectively, the output terminal of described first and second differential amplifiers connects the positive and negative or negative positive input terminal of secondary differential amplifier respectively, and the output terminal of this secondary differential amplifier constitutes the output terminal of described double passage differential anti-jamming current amplification circuit.
2. double passage differential anti-jamming current amplification circuit according to claim 1 is characterized in that between the input end of secondary differential amplifier of the output terminal of described first differential amplifier and its correspondence and the voltage amplifier that can set up Gain Adjustable between the input end of the secondary differential amplifier of the output terminal of described second differential amplifier and its correspondence.
3. double passage differential anti-jamming current amplification circuit according to claim 1 and 2 is characterized in that described first and second current-voltage converters are transimpedance amplifier, integrator, switch integrator.
4. double passage differential anti-jamming current amplification circuit, comprise current-voltage converter and differential amplifier, it is characterized in that the input end of first and second current-voltage converters constitutes the first input end and second input end of described double passage differential anti-jamming current amplification circuit respectively, the reference voltage end of described first current-voltage converter constitutes the reference input of described double passage differential anti-jamming current amplification circuit, the reference voltage end ground connection of described second current-voltage converter, the output terminal of described first current-voltage converter and its reference input connect the positive-negative input end of this first differential amplifier respectively, the output terminal of the output terminal of this first differential amplifier and described second current-voltage converter connects the positive and negative or negative positive input terminal of secondary differential amplifier respectively, and the output terminal of this secondary differential amplifier constitutes the output terminal of described double passage differential anti-jamming current amplification circuit.
5. double passage differential anti-jamming current amplification circuit according to claim 4 is characterized in that between the input end of secondary differential amplifier of the output terminal of described first differential amplifier and its correspondence and the voltage amplifier that can set up Gain Adjustable between the input end of the secondary differential amplifier of the output terminal of described second current-voltage converter and its correspondence.
6. according to claim 4 or 5 described double passage differential anti-jamming current amplification circuits, it is characterized in that described first and second current-voltage converters are transimpedance amplifier, integrator, switch integrator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101911986A CN100529675C (en) | 2007-12-11 | 2007-12-11 | Double passage differential anti-jamming current amplification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101911986A CN100529675C (en) | 2007-12-11 | 2007-12-11 | Double passage differential anti-jamming current amplification circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101187572A true CN101187572A (en) | 2008-05-28 |
| CN100529675C CN100529675C (en) | 2009-08-19 |
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ID=39480060
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007101911986A Expired - Fee Related CN100529675C (en) | 2007-12-11 | 2007-12-11 | Double passage differential anti-jamming current amplification circuit |
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| CN (1) | CN100529675C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111176278A (en) * | 2019-12-31 | 2020-05-19 | 宁波奇亚园林工具有限公司 | Intelligent mower sensor control circuit and method based on alternating current magnetic field |
| CN113693302A (en) * | 2021-08-27 | 2021-11-26 | 歌尔微电子股份有限公司 | Electronic cigarette control method, electronic cigarette control device and electronic cigarette |
| CN117322894A (en) * | 2023-11-16 | 2024-01-02 | 成都信息工程大学 | Electroencephalogram acquisition analog front-end circuit adopting dual-channel multiplexing technology |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3990966B2 (en) * | 2002-10-08 | 2007-10-17 | 松下電器産業株式会社 | Differential amplifier |
| JP2005277554A (en) * | 2004-03-23 | 2005-10-06 | Sanyo Electric Co Ltd | Comparator circuit |
-
2007
- 2007-12-11 CN CNB2007101911986A patent/CN100529675C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111176278A (en) * | 2019-12-31 | 2020-05-19 | 宁波奇亚园林工具有限公司 | Intelligent mower sensor control circuit and method based on alternating current magnetic field |
| CN113693302A (en) * | 2021-08-27 | 2021-11-26 | 歌尔微电子股份有限公司 | Electronic cigarette control method, electronic cigarette control device and electronic cigarette |
| CN113693302B (en) * | 2021-08-27 | 2024-03-01 | 潍坊正达实业有限公司 | Electronic cigarette control method, electronic cigarette control device and electronic cigarette |
| CN117322894A (en) * | 2023-11-16 | 2024-01-02 | 成都信息工程大学 | Electroencephalogram acquisition analog front-end circuit adopting dual-channel multiplexing technology |
| CN117322894B (en) * | 2023-11-16 | 2024-04-02 | 成都信息工程大学 | Electroencephalogram acquisition analog front-end circuit adopting dual-channel multiplexing technology |
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| Publication number | Publication date |
|---|---|
| CN100529675C (en) | 2009-08-19 |
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