CN201417179Y - Low-noise numerical control bias voltage generating circuit for infrared imaging detector - Google Patents
Low-noise numerical control bias voltage generating circuit for infrared imaging detector Download PDFInfo
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- CN201417179Y CN201417179Y CN2009200056463U CN200920005646U CN201417179Y CN 201417179 Y CN201417179 Y CN 201417179Y CN 2009200056463 U CN2009200056463 U CN 2009200056463U CN 200920005646 U CN200920005646 U CN 200920005646U CN 201417179 Y CN201417179 Y CN 201417179Y
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Abstract
The utility model discloses a low-noise numerical control bias voltage generating circuit for infrared imaging detectors, which comprises a numerical control voltage generating unit, a filtering unitand a drive unit which are sequentially connected. The numerical control voltage generating unit receives an external numerical signal to generate voltage signals of required amplitude values, and finally low-noise bias voltage is achieved after the filtering of the filtering unit and the amplification of the drive unit. The low-noise numerical control bias voltage generating circuit with simple structure and flexible control is capable of outputting voltage with different amplitude values at real time and being applied to the infrared detectors more conveniently and flexibly.
Description
Technical field
The utility model relates to voltage generation circuit, particularly relates to a kind of low-noise numerical control bias voltage generating circuit that is used for infrared imaging detector.
Background technology
Along with the progress of device technology, infrared eye has had significant progress in recent years, and then has driven the widespread use of infrared imagery technique at national defence and civil area.According to the principle of work of infrared eye, need provide the several bias voltage for it.These biased electrical are pressed with two characteristics: 1) noise requirements of bias voltage is very strict, and noise must be controlled at very low level; 2) existing fixed voltage value in the bias voltage of a few road also has for the Different Red external detector and has different magnitudes of voltage.With certain type infrared eye is example, need 4 road bias voltages altogether, wherein 2 road bias voltages are fixed, and 2 road bias voltages are different and different with device, and this 4 road bias voltage is the requirement of noise: and 2uV (1Hz～1KHz), 5uV (1Hz～10KHz), 100uV (1Hz～10MHz).
Traditional bias voltage circuit method for designing is at present, is produced the voltage of the amplitude that meets the requirements earlier by the Voltage Reference source circuit, handles through low noise operational amplifier then, is satisfied the bias voltage of voltage magnitude and noise requirements simultaneously.For the bias voltage that need set different amplitudes according to different detectors, common way is that design has divider resistance in circuit, and the associative operation amplifier is realized the conversion to the voltage reference source circuit output voltage, obtains the bias voltage of required amplitude again.
Above-mentioned such circuit design, though can satisfy the noise requirements and the amplitude requirement of bias voltage, but because the low noise operational amplifier circuit is complicated, and the mode of electric resistance partial pressure bothers in the side circuit debug process, in case determine just can't adjust in real time, thereby brought complex circuit designs, taken inconvenience parts such as board area is big, adjustment bias voltage amplitude trouble, be unfavorable for realizing infrared eye circuit miniaturization and intelligentized demand.
The utility model content
The purpose of this utility model provide a kind of simple in structure, conveniently control, have very low noise bias-voltage generating circuit.
For achieving the above object, the utility model provides a kind of low-noise numerical control bias voltage generating circuit, and described circuit receives an external digital signal, comprises the numerical control voltage generation unit, filter unit and the driver element that connect successively;
Wherein said numerical control voltage generation unit receives described digital signal, is used to produce the analog voltage signal of required amplitude;
Wherein said filter unit is used for the voltage signal that numerical control voltage generation unit produces is carried out filtering, so that obtain low noise voltage signal;
Wherein said driver element is used for the low noise voltage signal of filter unit output is amplified, so that obtain the bias voltage of high driving ability.
Described numerical control voltage generation unit reaches the peripheral components that links to each other with digital to analog converter by a digital to analog converter and forms.
Described peripheral components comprises capacitor C 1, C2, C3, resistance R 1, R2; Wherein capacitor C 1, C2, C3 form the electric source filter circuit that links to each other with digital to analog converter; Wherein resistance R 1, R2 form the pull-up circuit that links to each other with digital to analog converter, and described numerical control voltage generation unit receives an external digital signal by described pull-up circuit.
Described numerical control voltage generation unit is exported the independent voltage signal that multichannel has different amplitudes simultaneously.
Described filter unit is a low-pass filter.
Described driver element is a low noise operational amplifier, and the inverting input of described operational amplifier links to each other with the output terminal of filtering circuit, and the normal phase input end of described operational amplifier links to each other with the output terminal of described operational amplifier.
As shown from the above technical solution, adopt the method for analog device different fully in the utility model and the prior art, but the circuit design method that adopts modulus to mix had both had the Digital Circuit Control flexible characteristic, the performance that also has the mimic channel ultra-low noise, and structure is very simple.The utility model can provide the bias voltage of different amplitudes in real time according to the needs of infrared eye, thereby is applied in the infrared eye more easily and more flexibly.
With reference to the accompanying drawing description of a preferred embodiment, above-mentioned and other purpose of the present utility model, feature and advantage will be more obvious by following.
Description of drawings
Fig. 1 is a circuit structure block diagram of the present utility model;
Fig. 2 is the circuit structure schematic diagram of an embodiment of the present utility model.
Embodiment
To describe specific embodiment of the utility model in detail below.Should be noted that the embodiments described herein only is used to illustrate, be not limited to the utility model.
The utility model circuit is mainly used on the infrared eye, and this circuit is made up of numerical control voltage generation unit, filter unit and driver element.As shown in Figure 1, this numerical control voltage generation unit receives the digital signal of an external control unit, export the voltage signal V1 of required amplitude, because the characteristic of numerical control voltage generation unit, the noise on the voltage signal V1 of output has surpassed the desired noise level of infrared eye bias voltage; This voltage signal V1 that has big noise is through behind the filter unit, filtering most noises, obtain meeting the voltage signal V2 of the low noise level of infrared eye bias voltage requirement; Because the voltage signal V2 driving force through filter unit is very little, so need again through the driving force of one-level driver element with enhancing signal.The final bias voltage V that has obtained offering infrared eye through above-mentioned three grades of circuit
Bias
Below in conjunction with a specific embodiment circuit structure of the present utility model is described, as shown in Figure 2, circuit of the present utility model comprises numerical control voltage generation unit 101, filter unit 102, driver element 103.
Described numerical control voltage generation unit 101 mainly is made up of a digital to analog converter DAC (Digital-AnalogConverter, i.e. DAC) integrated circuit and peripheral circuit device thereof, and described peripheral circuit device comprises capacitor C 1, C2, C3, and resistance R 1, R2.Preferably, described DAC integrated circuit can be exported 4 road independent voltages simultaneously, and each road output voltage all has 10 resolution, 0V～+ voltage range of 5V, the output accuracy of 5mV.Capacitor C 1, C2, C3 form electric source filter circuit and link to each other with the DAC integrated circuit, and C1, C2 are connected in parallel on can reduce DAC circuit power noise between DAC power supply and the ground, and C3 is connected in parallel on can reduce DAC reference source noise between DAC reference source and the ground.Resistance R 1, R2 form pull-up circuit and link to each other with the digital serial communication bus of external control unit, and assurance external control unit can be exported digital configuration signal and give the DAC integrated circuit.External control described here unit can be single-chip microcomputer or DSP etc. any one can the configurable number weighted-voltage D/A converter device, described external control unit through digital serial communication bus output digital controlled signal, makes it export the voltage signal of required amplitude thereby come internal register to the DAC integrated circuit to be configured according to the communication protocol that provides in advance.
Described filter unit 102 is made up of resistance R 3, capacitor C 4, C5, this is a typical low-pass filter, behind this wave filter of voltage signal process of numerical control voltage generation circuit output, most noises are filtered, thereby reach the voltage noise index of the desired harshness of bias voltage.
Described driver element 103 is made of a low noise operational amplifier, owing to the driving force of the voltage signal that comes out from filter unit is very little, can't directly drive the infrared eye circuit, so must drive processing to it.The voltage signal of filter unit output connects the inverting input of operational amplifier, and the normal phase input end of operational amplifier links to each other with the output terminal of operational amplifier, thereby realizes a typical drive circuit functionality.Because the voltage signal itself from filter unit is exactly very low noise signal,, therefore when the design driven unit, must select operational amplifier for use with ultra-low noise in order not introduce more noise in this one-level of driver element.Since in the utility model circuit because fine noise control of the circuit before amplifier, so the discharge circuit is here built very simple, need not external component, with respect to discharge circuit of the prior art, operational amplifier of the prior art need be finished the function of noise reduction and driving simultaneously, so need some discrete components to build circuit with amplifier, structure is very complicated.
Actual measurement data shows, the voltage signal that low-noise numerical control bias voltage generating circuit of the present utility model provides satisfies the requirement of infrared eye fully on noise objective, i.e. 2uV (1Hz～1KHz), 5uV (1Hz～10KHz), 100uV (1Hz～10MHz).
The design philosophy of circuit designing thought of the present utility model and traditional low noise bias voltage circuit has a great difference, abandoned the method for designing that adopts analog component fully, use modulus design of hybrid circuits method instead, both had the Digital Circuit Control flexible characteristic, also had the performance of mimic channel ultra-low noise.Based on the integrated scale of the super large of current integrated circuit, DAC integrated circuit and driving circuit can be selected good performance indexes, chip that integrated level is high easily for use, make integrated circuit simple in structure, and it is little to take board area.For example, can select DAC integrated circuit and the integrated integrated circuit of 4 low noise operational amplifiers for use with 4 tunnel outputs, 4 road low noise bias voltages that so only need 2 chips, 6 resistance and 10 electric capacity just can access can to dispose arbitrarily in real time.Can dispose the low noise bias voltage in real time, both make things convenient for the debugging of infrared eye circuit, also the application for infrared eye provides greater flexibility and expansion.
Though described the utility model with reference to the foregoing description, should be appreciated that used term is explanation and exemplary and nonrestrictive term.The spirit or the essence that do not break away from utility model because the utility model can specifically be implemented in a variety of forms, so be to be understood that, the foregoing description is not limited to any aforesaid details, and should be in the spirit and scope that claim limited of enclosing explain widely, therefore fall into whole variations in claim or its equivalent scope and remodeling and all should be the claim of enclosing and contain.
Claims (6)
1. a low-noise numerical control bias voltage generating circuit that is used for infrared imaging detector is characterized in that, described circuit comprises numerical control voltage generation unit, filter unit and the driver element that connects successively;
Wherein said numerical control voltage generation unit receives an external digital signal, is used to produce the analog voltage signal of required amplitude;
Wherein said filter unit is used for the voltage signal that numerical control voltage generation unit produces is carried out filtering, so that obtain low noise voltage signal;
Wherein said driver element is used for the low noise voltage signal of filter unit output is amplified, so that obtain the bias voltage of high driving ability.
2. circuit according to claim 1 is characterized in that, described numerical control voltage generation unit receives external digital signal by one and forms with the digital to analog converter of the analog voltage signal that generates required amplitude and the peripheral components that links to each other with digital to analog converter.
3. circuit according to claim 2 is characterized in that described peripheral components comprises capacitor C 1, C2, C3, resistance R 1, R2; Wherein capacitor C 1, C2, C3 form the electric source filter circuit that links to each other with digital to analog converter; Wherein resistance R 1, R2 form the pull-up circuit that links to each other with digital to analog converter, and described numerical control voltage generation unit receives described external digital signal by described pull-up circuit.
4. according to claim 1 or 3 described circuit, it is characterized in that described numerical control voltage generation unit is exported the independent voltage signal that multichannel has different amplitudes simultaneously.
5. circuit according to claim 1 is characterized in that, described filter unit is a low-pass filter.
6. circuit according to claim 1, it is characterized in that, described driver element is a low noise operational amplifier, and the inverting input of described operational amplifier links to each other with the output terminal of filtering circuit, and the normal phase input end of described operational amplifier links to each other with the output terminal of described operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200056463U CN201417179Y (en) | 2009-04-09 | 2009-04-09 | Low-noise numerical control bias voltage generating circuit for infrared imaging detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200056463U CN201417179Y (en) | 2009-04-09 | 2009-04-09 | Low-noise numerical control bias voltage generating circuit for infrared imaging detector |
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| Publication Number | Publication Date |
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| CN201417179Y true CN201417179Y (en) | 2010-03-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009200056463U Expired - Lifetime CN201417179Y (en) | 2009-04-09 | 2009-04-09 | Low-noise numerical control bias voltage generating circuit for infrared imaging detector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109085788A (en) * | 2018-10-12 | 2018-12-25 | 湖北视拓光电科技有限公司 | A kind of low noise voltage conditioned circuit and system |
| CN113720364A (en) * | 2021-08-11 | 2021-11-30 | 北京波谱华光科技有限公司 | Infrared analog signal conditioning and collecting circuit |
-
2009
- 2009-04-09 CN CN2009200056463U patent/CN201417179Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109085788A (en) * | 2018-10-12 | 2018-12-25 | 湖北视拓光电科技有限公司 | A kind of low noise voltage conditioned circuit and system |
| CN113720364A (en) * | 2021-08-11 | 2021-11-30 | 北京波谱华光科技有限公司 | Infrared analog signal conditioning and collecting circuit |
| CN113720364B (en) * | 2021-08-11 | 2022-12-20 | 北京波谱华光科技有限公司 | Infrared analog signal conditioning and collecting circuit |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: NORTH GUANGWEI TECHNOLOGY INC. Free format text: FORMER NAME: BEIJING GUANGWEIJI ELECTRICITY TECHNOLOGIES CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 117, room 100176, block B, 18 West South Road, Beijing economic and Technological Development Zone, Beijing, China Patentee after: NORTH GUANGWEI TECHNOLOGY INC. Address before: 117, room 100176, block B, 18 West South Road, Beijing economic and Technological Development Zone, Beijing, China Patentee before: Beijing Guangweiji Electricity Technologies Co., Ltd. |
|
| C56 | Change in the name or address of the patentee | ||
| CP02 | Change in the address of a patent holder |
Address after: 100176, Beijing economic and Technological Development Zone, Beijing, Rong Jingdong street, No. 1, building 12, 3, 1, unit 1011 Patentee after: NORTH GUANGWEI TECHNOLOGY INC. Address before: 117, room 100176, block B, 18 West South Road, Beijing economic and Technological Development Zone, Beijing, China Patentee before: NORTH GUANGWEI TECHNOLOGY INC. |
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| CX01 | Expiry of patent term |
Granted publication date: 20100303 |
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| CX01 | Expiry of patent term |