CN105222900B - Infrared focal plane array reading circuit - Google Patents
Infrared focal plane array reading circuit Download PDFInfo
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- CN105222900B CN105222900B CN201510586598.1A CN201510586598A CN105222900B CN 105222900 B CN105222900 B CN 105222900B CN 201510586598 A CN201510586598 A CN 201510586598A CN 105222900 B CN105222900 B CN 105222900B
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Abstract
The present invention provides a kind of infrared focal plane array reading circuit, module is kept including negative charge pump module, the signal input module of interconnection and integration sampling and keeps the gain amplification module that module is connect, the negative charge pump module to keep module to connect with signal input module and integration sampling respectively with the integration sampling.Pass through default or adjusting back bias voltage, so that the first operational amplifier and the input common mode voltage of second operational amplifier are zero, so that integrating capacitor voltage and sampled capacitor voltage change to ground voltage from reference voltage, realize that photo-signal full swing integral and the sampling of photoelectric signal full swing are kept, and photovoltage sampled signal is subjected to full swing Buffer output, to extend the time of integration, full swing signal is exported, achievees the purpose that the signal output quality for improving reading circuit in infrared focal plane array.
Description
Technical field
The present invention relates to read integrated circuit fields, especially a kind of infrared focal plane array reading circuit.
Background technology
Infrared focal plane array is the core devices in advanced infrared system, is widely used in infrared thermal imaging, scouts night
Depending in the fields such as, precise guidance, search and track and monitoring early warning.Infrared focal plane array generally consists of two parts：Infrared spy
Device and reading circuit are surveyed, infrared detector generates one after receiving incident infra-red radiation, in the incoming position of infra-red radiation
A partial charge related with incident IR radiation performance, is transferred to corresponding reading circuit, and reading circuit will be to these telecommunications
Number carry out integral amplification, sampling is kept, then by exporting buffering and multiplex system, signal is finally sent to monitoring system,
Form image.
Reading circuit (ROIC) is the integrated circuit made of standard CMOS silicon technology, is the weight of infrared focal plane array
Component part is wanted, is connect with infrared detector by indium bump bonding mode, reading circuit is generally by unitary operation amplifier, signal
The part such as pretreatment and transmission circuit, output amplifier and digital control circuit is constituted.
The developing direction of infrared focal plane array is that large area array, high-resolution, double-colored/polychrome, very long wave are infrared at this stage
Detector, main passive avalanche photodide etc., and these require that reading circuit has smaller area, so as to realize with it is red
The matching of external detector；And reading circuit is required to have the longer time of integration, to reach required signal-to-noise ratio (SNR).
Patent 201310150721.6《A kind of reading integrated circuit inhibiting structure with memory function background》And patent
CN203629686U《A kind of reading integrated circuit that there are two step backgrounds to inhibit function》Describe by reduce background current come
The method for improving the time of integration.Patent 201310150721.6 saves area in such a way that part of module is shared, thus
Larger integrating capacitor is placed in unit, extends the reading circuit time of integration, and patent CN203629686U passes through simplified element electricity
The structure on road obtains enough capacitance sizes, also has increase integrating capacitor by way of multilayer capacitor at present, extends product
Between timesharing, the signal-to-noise ratio of focal plane output signal is improved.But with the reduction of reading circuit process and supply voltage
Reduction, the output voltage swing of above-mentioned reading integrated circuit is difficult to meet demand.
Invention content
Output voltage swing present in for the above-mentioned prior art is difficult to the problem of meet demand, and it is an object of the invention to carry
For a kind of infrared focal plane array reading circuit so that reading circuit can export full swing signal in infrared focal plane array,
Signal to improve reading circuit in infrared focal plane array exports quality.
A kind of infrared focal plane array reading circuit, including negative charge pump module, the signal input module of interconnection with
And integration sampling keeps module and keeps the gain amplification module that module is connect, the negative charge pump with the integration sampling
Module keeps module to connect with signal input module and integration sampling respectively；
The signal input module includes the first operational amplifier and integrating capacitor, and the power supply of the first operational amplifier is negative
The extreme back bias voltage for receiving the output of negative charge pump module adjusts input common mode voltage, and first operational amplifier will be from reverse phase
The photo-signal amplification that input terminal receives, amplified photo-signal is exported to integrating capacitor by output end；The product
Divide capacitance that photo-signal is converted to photoelectric signal；
It includes second operational amplifier and sampling capacitance, the electricity of second operational amplifier that the integration sampling, which keeps module,
Source negative pole end receives the back bias voltage of negative charge pump module output, adjusts input common mode voltage, and the second operational amplifier will be from
The photoelectric signal amplification that in-phase input end receives, amplified photoelectric signal is exported to sampling capacitance by output end；Institute
It states sampling capacitance the photoelectric signal is sampled and kept；
Photovoltage sampled signal is carried out Buffer output by the gain amplification module.
Infrared focal plane array reading circuit in the present invention passes through default or adjusting back bias voltage so that the first operation
Amplifier and the input common mode voltage of second operational amplifier are zero, so that integrating capacitor voltage and sampling capacitance electricity
Pressure changes to ground voltage from reference voltage, realizes that photo-signal full swing integral and the sampling of photoelectric signal full swing are protected
It holds, and photovoltage sampled signal is subjected to full swing Buffer output, to extend the time of integration, export full swing signal, reach
The purpose of quality is exported to the signal for improving reading circuit in infrared focal plane array.
Description of the drawings
Fig. 1 is the structural schematic diagram of the infrared focal plane array reading circuit of one embodiment；
Fig. 2 is the circuit structure diagram of the infrared focal plane array reading circuit of one embodiment；
Fig. 3 is the structural schematic diagram of the infrared focal plane array reading circuit of another embodiment.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into
One step it is described in detail.
Please refer to Fig.1 the structural schematic diagram of the infrared focal plane array reading circuit of middle one embodiment.
A kind of infrared focal plane array reading circuit includes the signal input module of negative charge pump module 103, interconnection
100 and integration sampling keep module 101 and keep the gain amplification module 102 that connect of module, institute with the integration sampling
State negative charge pump module 103 keeps module to connect 101 with signal input module 100 and integration sampling respectively；
The signal input module 100 includes the first operational amplifier 104 and integrating capacitor 105, the first operation amplifier
The power cathode end of device receives the back bias voltage of 103 output of negative charge pump module, adjusts input common mode voltage, and first operation is put
Big device 104 amplifies the photo-signal received from inverting input, and amplified photo-signal is exported extremely by output end
Integrating capacitor 105；Photo-signal is converted to photoelectric signal by the integrating capacitor 105；
It includes second operational amplifier 106 and sampling capacitance 107, the second operation that the integration sampling, which keeps module 101,
The power cathode end of amplifier 106 receives the back bias voltage of 103 module of negative charge pump output, adjusts input common mode voltage, and described the
Two operational amplifiers 106 amplify the photoelectric signal received from in-phase input end, and amplified photoelectricity is exported by output end
Press signal to sampling capacitance 107；The sampling capacitance 107 is sampled and is kept to the photoelectric signal；
Photovoltage sampled signal is carried out Buffer output by the gain amplification module 102.
In the present embodiment, pass through default or adjusting back bias voltage so that the first operational amplifier 104 and the second operation are put
The input common mode voltage of big device 106 is zero, so that 105 voltage of integrating capacitor and 107 voltage of sampling capacitance are electric from benchmark
Pressure changes to ground voltage, realizes that photo-signal full swing integral and the sampling of photoelectric signal full swing are kept, and by light
Voltage sampling signal carries out full swing Buffer output, to extend the time of integration, exports full swing signal, it is infrared to reach raising
The purpose of the signal output quality of reading circuit in focal plane arrays (FPA).
First operational amplifier 104 is Foldable cascade operational amplifier in one of the embodiments,.Institute
The open-loop gain for stating Foldable cascade operational amplifier is high, and output offset voltage is small, and common-mode rejection ratio is high, Low-Temperature Reliability
By force.
The second operational amplifier 106 is five pipe operational amplifiers in one of the embodiments,.The five pipes operation
Amplifier saves area, and can meet the requirement of driving.
As shown in Fig. 2, the circuit structure diagram of the infrared focal plane array reading circuit for one embodiment.
The signal input module further includes first switch K1 and second switch K2 in one of the embodiments, described
First switch K1 is connected between the output end and integrating capacitor C1 of the first operational amplifier A 1, and the second switch K2 is connected to
Between reference voltage and integrating capacitor C1, by controlling first switch K1 and second switch K2 accesses or open circuit so that integral electricity
Hold C1 and is in reset state or integrating state.
Specifically, by controlling first switch K1 open circuits, second switch K2 accesses so that on the basis of integrating capacitor C1 voltages
Voltage is in reset state；By controlling first switch K1 accesses, second switch K2 open circuits so that photo-signal is integrated to
In integrating capacitor C1, and then the time of integration of integrating capacitor C1 is controlled, and prevents infrared detector in infrared focal plane array
Overheat the electric capacity chip of picture dot breakdown integrating capacitor C1.Therefore, the time of integration of photo-signal is extended, it is red to improve
The signal-to-noise ratio of outer focal plane arrays (FPA) output signal.
It includes third switch K3 that the integration sampling, which keeps module, in one of the embodiments, the third switch K3
It is connected between reference voltage and the power positive end of second operational amplifier A2, when sampling for controlling sampling capacitance C2
Between.
Specifically, by controlling third switch K3 accesses, second operational amplifier A2 starts to work normally, integrating capacitor C1
By in second operational amplifier A2 output lights voltage signal to sampling capacitance C2；By controlling third switch K3 open circuits so that
Sampling capacitance C2 stops sampling.Therefore, the third switch K3 is used to control the sampling time of sampling capacitance C2, to further
Ensure the sampling of photoelectric signal full swing, improves the signal sampling quality of reading circuit in infrared focal plane array.
The gain amplification module includes in one of the embodiments,：
Third operational amplifier A 3, the in-phase input end connection sampling capacitance C2 of the third operational amplifier A 3, reverse phase
Input terminal connects output end, power cathode end ground connection and power positive end and connects reference voltage, and third operational amplifier A 3 will
The photovoltage sampled signal amplification received from in-phase input end, amplified photovoltage sampled signal is exported by output end；
4th switch K4, the 4th switch K4 are connected to the power positive end of reference voltage and third operational amplifier A 3
Between, the buffer time for controlling 3 output light voltage sampling signal of third operational amplifier A；
The in-phase input end connection third operational amplifier A 3 of four-operational amplifier A4, the four-operational amplifier A4
Output end, inverting input connection output end, power cathode end ground connection and power positive end connect reference voltage, the 4th fortune
It calculates amplifier A4 to amplify the photovoltage sampled signal received from in-phase input end, amplified photovoltage is exported by output end
Sampled signal；
5th switch K5, the 5th switch K5 are connected to the power positive end of reference voltage and four-operational amplifier A4
Between, the buffer time for controlling four-operational amplifier A4 output light voltage sampling signals.
In the embodiment, the 4th switch K4 accesses of control, the 5th switch K5 are breaking, the third operational amplifier A 3 it is same
Phase input terminal starts to receive the photovoltage sampled signal exported from sampling capacitance C2；Control the 5th switch K5 accesses, the described 4th
The in-phase input end of operational amplifier A 4 starts to receive the photovoltage sampled signal exported from 3 output end of third operational amplifier A.
Therefore, by gradually controlling the 4th switch K4 and the 5th switch K5 accesses, to which the photovoltage in sampling capacitance C2 be sampled
Signal carries out Full-swing output successively, improves the output quality of photovoltage sampled signal.
As a preferred embodiment of the embodiment, can while photovoltage sampled signal is exported,
Sampling and the guarantor that signal input module carries out the integral of photo-signal and integration sampling keeps module to carry out photoelectric signal
It holds, is carried out at the same time signal integration and output to realize, improves the efficiency that reading circuit signal exports in infrared focal plane array.
In one of the embodiments, as shown in figure 3, the infrared focal plane array reading circuit further includes timing control
Circuit module 300, the sequential control circuit module 300 respectively with negative charge pump module 103, signal input module 100, integral
Sampling and keep module 101 and gain amplification module 102 connect, and are used for the negative charge pump module 103, signal input module
100, integration sampling keeps module 101 and gain amplification module 102 to provide time sequential pulse.Thus it is guaranteed that infrared focus plane battle array
The normal orderly operation of row reading circuit.
It is a preferred embodiment of the present invention below, as shown in Figure 2：
Clock signal is provided by sequential control circuit module, controls each module in infrared focal plane array reading circuit
Work：Control first switch K1 open circuits, second switch K2 accesses so that voltage on the basis of integrating capacitor C1 voltages, in reset
State；Second switch K2 open circuits, first switch K1 accesses are controlled, the power cathode end of the first operational amplifier A 1 receives negative electrical charge
The preset back bias voltage of pump module so that the input common mode voltage of the first operational amplifier A 1 is zero, is exported and is amplified by output end
Photo-signal is converted to photoelectric signal by photo-signal afterwards to integrating capacitor C1, integrating capacitor C1, reaches default product
After between timesharing, the K1 open circuits of control first switch；Control third switch K3 accesses, the power cathode end of second operational amplifier A2
Receive the preset back bias voltage of negative charge pump module so that the input common mode voltage of second operational amplifier A2 is zero, passes through output
End output light voltage signal is sampled and is kept to the photoelectric signal to sampling capacitance C2, sampling capacitance C2, reaches pre-
If after sampling the retention time, the K3 open circuits of control third switch；Control the 4th switch K4 accesses, the 5th switch K5 open circuits, third
The in-phase input end of operational amplifier A 3 starts to receive the photovoltage sampled signal exported from sampling capacitance C2, reaches default output
After time, the 5th switch K5 accesses are controlled, the in-phase input end of four-operational amplifier A4 starts to receive to be put from third operation
The photovoltage sampled signal of big device A3 output ends output, and exported.
Therefore, pass through preset back bias voltage so that the first operational amplifier A 1 and the common mode of second operational amplifier A2
Input voltage is zero, so that integrating capacitor C1 voltages and sampling capacitance C2 voltages change to ground connection electricity from reference voltage
Pressure, realize photo-signal full swing integral and photoelectric signal full swing sampling keep, and by photovoltage sampled signal into
Row full swing Buffer output exports full swing signal to extend the time of integration, reaches to improve and be read in infrared focal plane array
Go out the purpose of the signal output quality of circuit.
Each technical characteristic of embodiment described above can be combined arbitrarily, to keep description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
Cannot the limitation to the scope of the claims of the present invention therefore be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (7)
1. a kind of infrared focal plane array reading circuit, which is characterized in that including：Negative charge pump module, interconnection signal
Input module and integration sampling keep module and keep the gain amplification module that module is connect, institute with the integration sampling
State negative charge pump module keeps module to connect with signal input module and integration sampling respectively；
The signal input module includes the first operational amplifier and integrating capacitor, the power cathode end of the first operational amplifier
It receives the back bias voltage of negative charge pump module output, adjust input common mode voltage, first operational amplifier will be from anti-phase input
The photo-signal amplification that end receives, amplified photo-signal is exported to integrating capacitor by output end；The integral electricity
Hold and photo-signal is converted into photoelectric signal；
It includes second operational amplifier and sampling capacitance that the integration sampling, which keeps module, and the power supply of second operational amplifier is negative
The extreme back bias voltage for receiving the output of negative charge pump module adjusts input common mode voltage, and the second operational amplifier will be from same phase
The photoelectric signal amplification that input terminal receives, amplified photoelectric signal is exported to sampling capacitance by output end, described to adopt
Sample capacitance is sampled and is kept to the photoelectric signal；
The photoelectric signal of sampling is carried out Buffer output by the gain amplification module.
2. infrared focal plane array reading circuit according to claim 1, which is characterized in that the signal input module is also
Including first switch and the second switch, the first switch be connected to the first operational amplifier output end and integrating capacitor it
Between, the second switch is connected between reference voltage and integrating capacitor, by control first switch and the second switch access or
Open circuit so that integrating capacitor is in reset state or integrating state.
3. infrared focal plane array reading circuit according to claim 1, which is characterized in that first operational amplifier
For Foldable cascade operational amplifier.
4. infrared focal plane array reading circuit according to claim 1, which is characterized in that the integration sampling keeps mould
Block includes third switch, and the third switch is connected between reference voltage and the power positive end of second operational amplifier, is used
In the sampling time of control sampling capacitance.
5. infrared focal plane array reading circuit according to claim 1, which is characterized in that the second operational amplifier
For five pipe operational amplifiers.
6. infrared focal plane array reading circuit according to claim 1, which is characterized in that the gain amplification module packet
It includes：
Third operational amplifier, the in-phase input end connection sampling capacitance of the third operational amplifier, inverting input connection
Output end, power cathode end ground connection and power positive end connect reference voltage, and third operational amplifier will be from in-phase input end
The photovoltage sampled signal of reception is amplified, and amplified photovoltage sampled signal is exported by output end；
4th switch, the 4th switch are connected between reference voltage and the power positive end of third operational amplifier, are used for
Control the buffer time of third operational amplifier output light voltage sampling signal；
Four-operational amplifier, the output end of the in-phase input end connection third operational amplifier of the four-operational amplifier,
Inverting input connects output end, power cathode end ground connection and power positive end and connects reference voltage, four-operational amplifier
The photovoltage sampled signal received from in-phase input end is amplified, amplified photovoltage sampled signal is exported by output end；
5th switch, the 5th switch are connected between reference voltage and the power positive end of four-operational amplifier, are used for
Control the buffer time of four-operational amplifier output light voltage sampling signal.
7. infrared focal plane array reading circuit according to claim 1, which is characterized in that further include sequential control circuit
Module, the sequential control circuit keep module and gain with negative charge pump module, signal input module, integration sampling respectively
Amplification module connects, for keeping module and gain amplification to the negative charge pump module, signal input module, integration sampling
Module provides time sequential pulse.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510586598.1A CN105222900B (en) | 2015-09-15 | 2015-09-15 | Infrared focal plane array reading circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510586598.1A CN105222900B (en) | 2015-09-15 | 2015-09-15 | Infrared focal plane array reading circuit |
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| CN105222900A CN105222900A (en) | 2016-01-06 |
| CN105222900B true CN105222900B (en) | 2018-09-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9753138B1 (en) * | 2016-04-13 | 2017-09-05 | Microsoft Technology Licensing, Llc | Transducer measurement |
| JP2018084462A (en) * | 2016-11-22 | 2018-05-31 | 株式会社ミツトヨ | Encoder and signal processing circuit |
| CN112556862B (en) * | 2020-11-05 | 2022-07-01 | 天津大学 | Large dynamic range, small area readout circuit using current mirror for mode switching |
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| CN101582978A (en) * | 2009-06-18 | 2009-11-18 | 东南大学 | Background suppression method for infrared reading circuit and circuit thereof |
| CN102237850A (en) * | 2010-05-05 | 2011-11-09 | 普诚科技股份有限公司 | Motor control circuit applied to multiple control modes |
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| US8830776B1 (en) * | 2013-03-15 | 2014-09-09 | Freescale Semiconductor, Inc. | Negative charge pump regulation |
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| CN1770609A (en) * | 2004-11-03 | 2006-05-10 | 上海贝岭股份有限公司 | Single-power low-distortion wide-range positive/negative voltage signal sampling switch circuit |
| JP5093768B2 (en) * | 2007-07-31 | 2012-12-12 | パナソニック株式会社 | Signal readout circuit |
| US20140048683A1 (en) * | 2012-08-14 | 2014-02-20 | Luxen Technologies, Inc. | Readout integrated circuit for dynamic imaging |
| CN103247636A (en) * | 2013-04-26 | 2013-08-14 | 中国科学院上海技术物理研究所 | Readout integrated circuit adopting background suppression structure provided with memory function |
| CN104568169B (en) * | 2015-01-28 | 2017-12-26 | 江苏物联网研究发展中心 | The infrared focal plane read-out circuit of function is eliminated with imbalance |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101582978A (en) * | 2009-06-18 | 2009-11-18 | 东南大学 | Background suppression method for infrared reading circuit and circuit thereof |
| CN102237850A (en) * | 2010-05-05 | 2011-11-09 | 普诚科技股份有限公司 | Motor control circuit applied to multiple control modes |
| US8830776B1 (en) * | 2013-03-15 | 2014-09-09 | Freescale Semiconductor, Inc. | Negative charge pump regulation |
| CN103532382A (en) * | 2013-10-28 | 2014-01-22 | 无锡中星微电子有限公司 | Switching power supply circuit |
| CN103780231A (en) * | 2014-02-10 | 2014-05-07 | 绍兴光大芯业微电子有限公司 | Circuit structure for achieving peak value sampling and holding |
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