CN205720085U - A kind of amplifying circuit for tiny signal for air quality electrochemical sensor - Google Patents
A kind of amplifying circuit for tiny signal for air quality electrochemical sensor Download PDFInfo
- Publication number
- CN205720085U CN205720085U CN201620419410.4U CN201620419410U CN205720085U CN 205720085 U CN205720085 U CN 205720085U CN 201620419410 U CN201620419410 U CN 201620419410U CN 205720085 U CN205720085 U CN 205720085U
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- China
- Prior art keywords
- operational amplifier
- electrochemical sensor
- air quality
- signal
- effect transistor
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
This utility model relates to a kind of amplifying circuit for tiny signal for air quality electrochemical sensor, including air quality electrochemical sensor A1, field effect transistor Q1, operational amplifier U1A, operational amplifier U1B, wave filter L1, operational amplifier U1C, Xiao Te diode D1；Wherein, electrochemical sensor A1 working electrode W is connected with operational amplifier U1A negative input end, and the working electrode W of simultaneous electrochemical sensors A 1 is also connected with the source S of field effect transistor Q1, and the reference electrode R of electrochemical sensor A1 is connected with the drain D of field effect transistor Q1；Operational amplifier U1A contacts operational amplifier U1B and operational amplifier U1C simultaneously, the outfan of operational amplifier U1C connects clamper Xiao Te diode D1, clamper is carried out to amplifying signal, described operational amplifier U1A, operational amplifier U1B and operational amplifier U1C constitute three-stage operational amplifying circuit, this utility model simple in construction, uses less electronic component effectively small-signal to be amplified.
Description
Technical field
This utility model relates to environment of internet of things detection application, is specifically related to a kind of sensor
Signal conditioning circuit.
Background technology
Environmental monitoring field generally uses optical means to be monitored analyzing at present, and volume is big, becomes
This height, limits their installation and highly dense deployment way, due to electrochemical sensor
Superior function, has become the developing direction of environment of internet of things gas detector design.Pass
The design of sensor signal modulate circuit is particularly critical.Existing product design-signal conditioning circuit is only
Can be suitably used for the electrochemical sensor of a kind of model, and be easily subject to interference.
Utility model content
Technical problem to be solved in the utility model is to provide for a kind of small-signal and amplifies electricity
Road, it is achieved the technical scheme of above-mentioned purpose is as follows:
A kind of amplifying circuit for tiny signal for air quality electrochemical sensor, its feature exists
In: include air quality electrochemical sensor A1, field effect transistor Q1, operational amplifier U1A,
Operational amplifier U1B, wave filter L1, operational amplifier U1C, Xiao Te diode D1；
Wherein, electrochemical sensor A1 working electrode W is connected with operational amplifier U1A negative input end,
The working electrode W of simultaneous electrochemical sensors A 1 is also connected with the source S of field effect transistor Q1,
The reference electrode R of electrochemical sensor A1 is connected with the drain D of field effect transistor Q1；
Operational amplifier U1A contacts operational amplifier U1B and operational amplifier U1C simultaneously, and computing is put
The outfan of big device U1C connects clamper Xiao Te diode D1, carries out clamper to amplifying signal,
Described operational amplifier U1A, operational amplifier U1B and operational amplifier U1C constitute three grades of fortune
Calculate amplifying circuit.
Preferably, it is connected with wave filter between operational amplifier U1B and operational amplifier U1C
L1, wave filter L1 filtering clutter signal, lowers the loss of primary signal.
Preferably, electrochemical sensor A1 working electrode W and operational amplifier U1A negative input
Resistance R1 it is connected with between end.
Preferably, operational amplifier U1A negative input end and outfan are parallel with resistance R2.
Preferably, field effect transistor Q1 is also associated with resistance R3.
Preferably, the positive input terminal of operational amplifier U1A connects resistance R4, and R4's
The other end connects a bias voltage Vbais, constitutes first order amplifying circuit.
Preferably, the model of described field effect transistor Q1 is MMBFJ177.
This utility model simple in construction, uses less electronic component effectively small-signal to be entered
Row amplifies.
Accompanying drawing explanation
Fig. 1 is this utility model schematic diagram
Detailed description of the invention
Below in conjunction with the accompanying drawings this utility model is described in detail.
In figure, the amplifying circuit for tiny signal for air quality electrochemical sensor includes air
Quality electrochemical sensor A1, field effect transistor Q1, operational amplifier U1A, operational amplifier
U1B, wave filter L1, operational amplifier U1C, Xiao Te diode D1；Wherein, electrochemistry passes
Sensor A1 working electrode W is connected with operational amplifier U1A negative input end, and electrochemistry passes
It is connected with resistance R1 between sensor A1 working electrode W and operational amplifier U1A negative input end,
The working electrode W of simultaneous electrochemical sensors A 1 is also connected with the source S of field effect transistor Q1,
The reference electrode R of electrochemical sensor A1 is connected with the drain D of field effect transistor Q1, preferably
The model of field effect transistor Q1 is MMBFJ177, and field effect transistor Q1 is also connected with resistance R3.Computing
Amplifier U1A negative input end and outfan are parallel with resistance R2.
Operational amplifier U1A contacts operational amplifier U1B and operational amplifier U1C simultaneously, fortune
The outfan calculating amplifier U1C connects clamper Xiao Te diode D1, clamps amplifying signal
Position, with fault-tolerant, described operational amplifier U1A, operational amplifier U1B and operational amplifier
U1C constitutes three-stage operational amplifying circuit.The positive input terminal of preferably operational amplifier U1A connects to be had
Resistance R4, and at the other end one bias voltage Vbais of connection of R4, constitute the first order
Amplifying circuit, operational amplifier U1A and operational amplifier U1B formed second level amplifying circuit and
Third level amplifying circuit.In this utility model, the model of operational amplifier can be TLC2543.
Preferably contact between operational amplifier U1B and operational amplifier U1C wave filter L1,
Use wave filter L1 original to ensure that noise signal can lower while removing to greatest extent
Loss of signal.
This utility model simple in construction, it is possible to effectively small-signal is amplified.
These are only the preferred embodiment of this utility model embodiment, not in order to limit this
Utility model embodiment, within all spirit in this utility model embodiment and principle, is made
Any modification, equivalent substitution and improvement etc., should be included in the protection of this utility model embodiment
In the range of.
Claims (7)
1., for an amplifying circuit for tiny signal for air quality electrochemical sensor, its feature exists
In: include air quality electrochemical sensor A1, field effect transistor Q1, operational amplifier U1A,
Operational amplifier U1B, wave filter L1, operational amplifier U1C, Xiao Te diode D1；
Wherein, electrochemical sensor A1 working electrode W is connected with operational amplifier U1A negative input end,
The working electrode W of simultaneous electrochemical sensors A 1 is also connected with the source S of field effect transistor Q1,
The reference electrode R of electrochemical sensor A1 is connected with the drain D of field effect transistor Q1；
Operational amplifier U1A contacts operational amplifier U1B and operational amplifier U1C simultaneously, and computing is put
The outfan of big device U1C connects clamper Xiao Te diode D1, carries out clamper to amplifying signal,
Described operational amplifier U1A, operational amplifier U1B and operational amplifier U1C constitute three grades of fortune
Calculate amplifying circuit.
Tiny signal for air quality electrochemical sensor the most according to claim 1 is put
Big circuit, it is characterised in that: it is connected with between operational amplifier U1B and operational amplifier U1C
Wave filter L1, wave filter L1 filtering clutter signal, lowers the loss of primary signal.
Tiny signal for air quality electrochemical sensor the most according to claim 1 is put
Big circuit, it is characterised in that: electrochemical sensor A1 working electrode W and operational amplifier U1A
Resistance R1 it is connected with between negative input end.
Tiny signal for air quality electrochemical sensor the most according to claim 1 is put
Big circuit, it is characterised in that: operational amplifier U1A negative input end and outfan are parallel with resistance
R2。
Tiny signal for air quality electrochemical sensor the most according to claim 1 is put
Big circuit, it is characterised in that: field effect transistor Q1 is also associated with resistance R3.
Tiny signal for air quality electrochemical sensor the most according to claim 1 is put
Big circuit, it is characterised in that: the positive input terminal of operational amplifier U1A connects resistance R4,
And at the other end one bias voltage Vbais of connection of R4, constitute first order amplifying circuit.
Tiny signal for air quality electrochemical sensor the most according to claim 1 is put
Big circuit, it is characterised in that: the model of described field effect transistor Q1 is MMBFJ177.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620419410.4U CN205720085U (en) | 2016-05-10 | 2016-05-10 | A kind of amplifying circuit for tiny signal for air quality electrochemical sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620419410.4U CN205720085U (en) | 2016-05-10 | 2016-05-10 | A kind of amplifying circuit for tiny signal for air quality electrochemical sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205720085U true CN205720085U (en) | 2016-11-23 |
Family
ID=57304497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620419410.4U Ceased CN205720085U (en) | 2016-05-10 | 2016-05-10 | A kind of amplifying circuit for tiny signal for air quality electrochemical sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205720085U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021103500A1 (en) * | 2019-11-28 | 2021-06-03 | 长鑫存储技术有限公司 | Comparator |
-
2016
- 2016-05-10 CN CN201620419410.4U patent/CN205720085U/en not_active Ceased
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021103500A1 (en) * | 2019-11-28 | 2021-06-03 | 长鑫存储技术有限公司 | Comparator |
| US11683027B2 (en) | 2019-11-28 | 2023-06-20 | Changxin Memory Technologies, Inc. | Comparators |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| IW01 | Full invalidation of patent right |
Decision date of declaring invalidation: 20190606 Decision number of declaring invalidation: 40522 Granted publication date: 20161123 |
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| IW01 | Full invalidation of patent right |