CN203057074U - Self-heat elimination low-noise pre-amplifier - Google Patents
Self-heat elimination low-noise pre-amplifier Download PDFInfo
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- CN203057074U CN203057074U CN 201220543137 CN201220543137U CN203057074U CN 203057074 U CN203057074 U CN 203057074U CN 201220543137 CN201220543137 CN 201220543137 CN 201220543137 U CN201220543137 U CN 201220543137U CN 203057074 U CN203057074 U CN 203057074U
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- amplifier
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Abstract
The utility model provides a self-heat elimination low-noise pre-amplifier circuit, which can be applied in a thermosensitive infrared detector signal detection circuit or a characteristic parameter test circuit. The circuit utilizes a group of thermistors and a detector to form a bridge circuit; the two thermistors are connected through a precision potentiometer; and a sliding end of the potentiometer is connected to an operational amplifier noninverting input end. An operational amplifier inverting end is connected with a common end of an infrared detector detection pixel and a blind pixel; the bridge circuit is connected with a low-noise operational amplifier at a rear end; and the low-noise operational amplifier utilizes a T-shaped network as a feedback loop. The self-heat elimination low-noise pre-amplifier circuit has the following advantages that the bridge circuit of a thermistor detector is used, so that self-heat elimination is realized; meanwhile, due to the introduction of the precision potentiometer, voltage excursion caused by mismatching of the detection pixel and the blind pixel can be eliminated; the T-shaped network instead of a feedback resistance is utilized by the operational amplifier to form the feedback loop, so that circuit noise is reduced; and a structure of the circuit is simplified, so that the miniaturization of a circuit system and the integration of large-scale multiple components are convenient.
Description
Technical field
This patent belongs to the infrared detection technique field, the self-heating that is specifically related to a kind of thermosensitive type infrared detector is eliminated the low noise pre-amplification circuit, it can be used for the signal of thermosensitive type infrared detector reads, and also can be used for the characterisitic parameter test circuit of sensitive detection parts.
Background technology
The preamplifier design occupies critical role in infrared acquisition, sensitive detection parts are converted into the faint signal of telecommunication with radiation signal, has only by low-noise preamplifier to drive the follow-up signal treatment circuit, realizes acquisition of signal.Because the needs of polynary detection have proposed very high requirement to preamplifier: low noise, miniaturization are the emphasis of design.Therefore the two-stage pre-amplification circuit does not satisfy the requirement of miniaturization, need very big feedback resistance just can reach enough multiplication factors and stride resistance type single-stage amplifying circuit, this just introduces bigger Johnson noise to circuit, while thermosensitive type infrared detector, can cause temperature to raise owing to be biased outward, thereby influence detection accuracy.
Summary of the invention
At these problems, we have designed a kind of self-heating for the thermosensitive type infrared detector and have eliminated the low noise pre-amplification circuit, can eliminate the influence that the detector temperature rise causes detection accuracy to a certain extent, introduce T type feedback network simultaneously and replace mutual conductance resistance, thereby reduced the circuit thermal noise.
The purpose of this patent is achieved in that thermistor and the sensitive detection parts used with the detector same material constitute bridge circuit, apply same bias voltage, and respectively with the preamplifier in-phase end, end of oppisite phase connects, preamplifier is introduced voltage feedback in parallel, use T type feedback network to replace feedback resistance, each resistance of choose reasonable T type network is that available less resistance obtains bigger multiplication factor, reduces circuit noise.
As shown in Figure 1, this self-heating is eliminated low-noise preamplifier, comprises that self-heating is eliminated bridge circuit and with the low noise amplifier of T type network as feedback network, two thermistors and thermistor detector spare formation bridge circuit.Sensitive detection parts as shown in Figure 2, device is surveyed unit and is connected with the amplifier end of oppisite phase with the blind element common port, two thermistor common ports connect by precision potentiometer, the potentiometer sliding end is held in the same way with amplifier and is connected.Amplifier is introduced voltage negative feedback in parallel, and feedback network is made of T type resistor network.
Wherein, bridge circuit is by thermistor R
1, R
2, precision potentiometer R
w, sensitive detection parts are surveyed first R
d, blind element R
bConstitute, the rear end is by integrated transporting discharging amplifier A, resistance-feedback network R
3, R
4, R
5Constitute; The amplifier in-phase end connects potentiometer R
wSliding end, R
wIn addition two ends respectively with resistance R
1, R
2Connect R
1Another termination voltage input V+, R
2Another termination public terminal GND.Amplifier homophase termination signal input V
In, namely the temperature-sensitive detector is surveyed the common port of unit and blind element.Survey another termination power input V+ of unit, another termination GND of blind element.Cross-over connection resistance R between amplifier end of oppisite phase and the output
3, R
4, R
5The T type resistance networking that constitutes, wherein R
3Connect the amplifier end of oppisite phase, R
4Connect output, R
3, R
4Interconnect its common port of back and pass through R
5Meet GND.
Use integrated transporting discharging A can use single supply high accuracy low noise amplifier in reality, as OPA705, if infrared detector is polynary line array device, then can use four high guaily unit, as OPA4705, in order to reduce the circuit volume.Resistance R
3, R
4, R
5Can use high-precision metalfilmresistor.R
wCan use the high accuracy potentiometer.Resistance R
1, R
2Employing is with the thermistor of sensitive detection parts same material and specification.
This patent has following technological merit:
1 has self-heating eliminates ability, can eliminate the influence that temperature rise that ambient temperature fluctuation and bias voltage cause causes certainty of measurement.
2 introduce T type network replaces the resistance mutual conductance, reduces circuit noise.
3 is simple in structure, is suitable as the preamplifier of multicomponent device and realizes the Circuits System miniaturization.
Description of drawings
Fig. 1 is that the self-heating of this patent is eliminated low-noise preamplifier circuit theory schematic diagram.
Fig. 2 is the thermosensitive type infrared radiation detector spare schematic diagram that self-heating is eliminated the low-noise preamplifier correspondence.
Embodiment
It is as follows that self-heating is eliminated low-noise preamplifier embodiment:
A brachium pontis is by thermistor R in the bridge circuit of amplifier
1, R
2, precision potentiometer R
wConstitute, another brachium pontis is made of sensitive detection parts, and sensitive detection parts are by surveying first R
dWith the first R of compensation
bConstitute, as shown in Figure 2; The bridge circuit rear end is by integrated transporting discharging amplifier A, resistance-feedback network R
3, R
4, R
5Constitute.Integrated transporting discharging A in-phase end connects potentiometer R
wSliding end, R
wIn addition two ends respectively with resistance R
1, R
2Connect R
1Another termination voltage input V+, R
2Another termination public terminal GND.The anti-phase termination signal input of integrated transporting discharging A V
In, namely sensitive detection parts are surveyed first R
dWith blind element R
bCommon port.Survey first R
dAnother termination power input V+, blind element R
bAnother termination GND.Cross-over connection is by resistance R between integrated transporting discharging A end of oppisite phase and the output
3, R
4, R
5The T type resistance networking that constitutes, wherein R
3Connect integrated transporting discharging A end of oppisite phase, R
4Connect integrated transporting discharging A output, R
3, R
4Interconnect its common port of back and pass through R
5Meet GND.
This circuit further describes as follows:
Integrated transporting discharging A uses single supply high accuracy low noise amplifier, as OPA705.Resistance R
3, R
4, R
5Use high-precision metalfilmresistor.R
wUse the high accuracy potentiometer.Resistance R
1, R
2Employing is with the thermistor of sensitive detection parts same material and specification.
Claims (2)
1. a self-heating is eliminated low-noise preamplifier, comprises self-heating elimination bridge circuit and with the low noise amplifier of T type network as feedback network, it is characterized in that two thermistor R
1, R
2Constitute bridge circuit with sensitive detection parts, the detection unit of sensitive detection parts is connected with the amplifier end of oppisite phase with the blind element common port, and two thermistor common ports connect by precision potentiometer, and the potentiometer sliding end is held in the same way with amplifier and is connected; Amplifier is introduced voltage negative feedback in parallel, and feedback network is made of T type resistor network.
2. self-heating according to claim 1 is eliminated low-noise preamplifier, it is characterized in that, described self-heating is eliminated bridge circuit by thermistor R
1, R
2, precision potentiometer R
w, sensitive detection parts are surveyed first R
d, blind element R
bConstitute, the rear end is by integrated transporting discharging amplifier A, resistance-feedback network R
3, R
4, R
5Constitute; Wherein, the amplifier in-phase end connects potentiometer R
wSliding end, R
wIn addition two ends respectively with resistance R
1, R
2Connect R
1The other end is connected to voltage input V+, R
2Another termination public terminal GND; The input of amplifier homophase termination signal, namely the temperature-sensitive sensitive detection parts are surveyed the common port of unit and blind element; Cross-over connection resistance R between amplifier end of oppisite phase and the output
3, R
4, R
5The T type resistance networking that constitutes, wherein R
3Connect the amplifier end of oppisite phase, R
4Connect the amplifier output, R
3, R
4Interconnect its common port of back and pass through R
5Meet GND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220543137 CN203057074U (en) | 2012-10-22 | 2012-10-22 | Self-heat elimination low-noise pre-amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220543137 CN203057074U (en) | 2012-10-22 | 2012-10-22 | Self-heat elimination low-noise pre-amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203057074U true CN203057074U (en) | 2013-07-10 |
Family
ID=48739990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220543137 Expired - Fee Related CN203057074U (en) | 2012-10-22 | 2012-10-22 | Self-heat elimination low-noise pre-amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203057074U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102931923A (en) * | 2012-10-22 | 2013-02-13 | 中国科学院上海技术物理研究所 | Self-heating elimination low-noise preamplifier |
| CN114978046A (en) * | 2021-12-16 | 2022-08-30 | 中船重工安谱（湖北）仪器有限公司 | Weak voltage signal amplifying circuit under extremely low frequency |
-
2012
- 2012-10-22 CN CN 201220543137 patent/CN203057074U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102931923A (en) * | 2012-10-22 | 2013-02-13 | 中国科学院上海技术物理研究所 | Self-heating elimination low-noise preamplifier |
| CN114978046A (en) * | 2021-12-16 | 2022-08-30 | 中船重工安谱（湖北）仪器有限公司 | Weak voltage signal amplifying circuit under extremely low frequency |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130710 Termination date: 20181022 |