CN107517354A - A kind of infrared focal plane read-out circuit and its feedback control loop - Google Patents
A kind of infrared focal plane read-out circuit and its feedback control loop Download PDFInfo
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- CN107517354A CN107517354A CN201710828566.7A CN201710828566A CN107517354A CN 107517354 A CN107517354 A CN 107517354A CN 201710828566 A CN201710828566 A CN 201710828566A CN 107517354 A CN107517354 A CN 107517354A
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/30—Transforming light or analogous information into electric information
- H04N5/33—Transforming infrared radiation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/70—SSIS architectures; Circuits associated therewith
- H04N25/71—Charge-coupled device [CCD] sensors; Charge-transfer registers specially adapted for CCD sensors
- H04N25/75—Circuitry for providing, modifying or processing image signals from the pixel array
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J2005/0077—Imaging
Abstract
The invention discloses a kind of infrared focal plane read-out circuit and its feedback control loop, infrared focal plane read-out circuit includes reading circuit unit and feedback control loop, and reading circuit unit includes integrating amplification circuit；Integrating amplification circuit exports integral voltage；Feedback control loop includes voltage comparator F1, count control module and controlling switch, and voltage comparator F1 exports integral voltage to count control module compared with reference voltage Vcomp, and by comparative result；Count control module is counted according to the voltage comparator F1 comparative results exported, export count value N, and when count value N changes output pulse signal to controlling switch；Controlling switch one end is connected to the output end and fixed potential V of integrating amplification circuitrefBetween；And the pulse signal that the closure of controlling switch and shut-off are exported by count control module controls.Special controlling of the invention by feedback control loop, segment processing integrate, and reach the purpose for the circuit structure for expanding high temperature detection scope.
Description
Technical field
The present invention relates to a kind of infrared focal plane read-out circuit, and in particular to a kind of infrared focal plane read-out circuit and its anti-
Present control loop.
Background technology
Infrared focal plane array is the core photoelectric device that infrared image signal is obtained in infrared imagery technique, collects infrared light
Electricity conversion and signal transacting are a kind of high performance infrared solid imaging sensors in one.Infrared focal plane array mainly by
Infrared detector array and reading circuit composition, the effect of detector is to say that infra-red radiation is converted into electric signal, reading circuit pair
The faint infrared electric signal of detector sensing carries out preposition processing (as integration, amplification, filtering, sampling/holding and parallel/serial row turn
Change) and A/D conversions.
The reading circuit of traditional infrared focal plane, its function are that the pixel in infrared focus plane is biased, and by picture
First signal is changed, amplified and exported, the imaging for rear end.
But the investigative range of traditional infrared circuit of focal plane readout receives the limitation of temperature so that reading circuit institute energy
The investigative range of reading is more narrow, so as to limit use of the reading circuit in some high temperature applicationss, i.e., reads in the prior art
Go out circuit and use the problem of limited in some high temperature applicationss.
The content of the invention
It is an object of the invention to provide a kind of infrared focal plane read-out circuit and its feedback control loop, and this is infrared burnt flat
Face reading circuit has the infrared focal plane read-out circuit structure that can expand high temperature detection scope so that circuit can gather more
Signal in wide temperature range, solve the problems, such as that reading circuit uses limited in some high temperature applicationss in the prior art.
The present invention is achieved through the following technical solutions：
A kind of infrared focal plane read-out circuit, including reading circuit unit, the reading circuit unit include integration and amplified
Circuit and feedback control loop；The integrating amplification circuit accesses infrared acquisition signal and infrared acquisition signal is integrated,
And export integral voltage Vout；The feedback control loop includes voltage comparator F1, count control module CO and controlling switch
S, wherein：
The voltage comparator F1 is compared the integral voltage Vout and reference voltage Vcomp that integrating amplification circuit exports
Compared with, and comparative result is exported and gives count control module CO；
The count control module CO is counted according to the voltage comparator F1 comparative results exported, exports count value N,
And a pulse signal is exported when count value N changes and gives controlling switch S；
The output end of controlling switch S one end connection integrating amplification circuit, the other end connect a fixed potential Vref；
And the pulse signal that controlling switch S closure and shut-off are exported by count control module CO controls.
In the technical program, increase a feedback control loop in traditional reading circuit, feedback control loop includes one
Individual voltage comparator F1, a count control module CO and a logic control switch S, controlling switch S one end connection integration are put
The output end of big circuit, the other end connect a fixed potential Vref, so as to provide a V to integrating amplification circuitref, control
S is switched to the path of integrating amplification circuit；And the pulse that controlling switch S closure and shut-off are exported by count control module CO
Signal controls；When controlling switch S is closed, output end and the fixed potential V of integrating amplification circuitrefConducting；Controlling switch S is turned off
When, output end and the fixed potential V of integrating amplification circuitrefDisconnect, so, when count control module is in VoutValue be more than
VcompWhen, count control module CO segment count output switching activity times N, while export a logic level, the logic level
Connect controlling switch S so that the of short duration closures of controlling switch S, the output of integrating amplification circuit are pulled down to Vref, complete a week
The signal detection of phase；After pulse signal ends, integrating amplification circuit starts again at and integration is acquired to signal, and process is repeatedly
Carry out, integration, and multiple stored counts be repeatedly acquired to signal, the sampled signal that high temperature is expanded after investigative range can be obtained,
By the Special controlling of feedback control loop, segment processing integrates, and reaches the purpose for the circuit structure for expanding high temperature detection scope.
As a further improvement on the present invention, the reverse input end of the voltage comparator F1 connects integrating amplification circuit
Output end, positive input access reference voltage signal Vcomp, output end connection count control module CO input.
As the another improvement of the present invention, the integrating amplification circuit includes integral amplifier F2 and electric capacity C；The integration
Amplifier F2 positive input is connected current potential Vref, reverse input end access infrared acquisition signal, output end connection electricity
Pressure comparator F1 reverse input end simultaneously exports integral voltage Vout simultaneously；The electric capacity C is connected to the anti-of integral amplifier F2
To between input and output end.
Further, the feedback control loop also includes being used for the reference voltage unit circuit for providing reference voltage signal,
The output end connection voltage comparator F1 of reference voltage unit circuit positive input, infrared spy is exported to integrating amplification circuit
Survey signal.
Preferably, the reading circuit unit is the reading circuit that row level integrates.
Further, above-mentioned infrared focal plane read-out circuit also includes being used for the fixed potential branch for providing fixed potential Vref
Road, the output end of fixed potential branch road connect controlling switch the S other end and integrating amplification circuit simultaneously.
Further, the reading circuit unit also includes signal biasing circuit, and the output end of the signal biasing circuit connects
Connect the input of integrating amplification circuit.
A kind of feedback control loop of infrared focal plane read-out circuit, the feedback control loop and infrared focal plane readout electricity
The output end of the reading circuit unit on road is connected, and the feedback control loop includes voltage comparator F1, count control module CO
With controlling switch S, wherein：
The voltage comparator F1 by the voltage that reading circuit unit exports compared with reference voltage Vcomp, and will
Comparative result, which exports, gives count control module CO；
The comparative result that the count control module CO exports according to voltage comparator F1 carries out counting output count value N,
And a pulse signal is exported when count value N changes and gives controlling switch S；
The output end of controlling switch S one end connection reading circuit unit, the other end connect a fixed potential Vref；
And the pulse signal that controlling switch S closure and shut-off are exported by count control module CO controls.
Further, the output end of the reverse input end connection reading circuit unit of the voltage comparator F1, positive input
Terminate into reference voltage Vcomp, output end connection count control module CO.
Preferably, the feedback control loop also includes being used for the reference voltage unit circuit for providing reference voltage signal,
The output end connection voltage comparator F1 of reference voltage unit circuit positive input.
The present invention compared with prior art, has the following advantages and advantages：A kind of infrared focus plane of the present invention
Reading circuit increases a feedback control loop in traditional reading circuit, and feedback control loop includes a voltage comparator
F1, a count control module CO and a logic control switch S, controlling switch S one end connection integrating amplification circuit output
End, the other end connect a fixed potential Vref, so as to provide a Vref, controlling switch S to integration to integrating amplification circuit
The path of amplifying circuit；And the pulse signal that controlling switch S closure and shut-off are exported by count control module CO controls；Control
During system switch S closures, output end and the fixed potential V of integrating amplification circuitrefConducting；When controlling switch S is turned off, integration amplification
The output end of circuit and fixed potential VrefDisconnect, so, when count control module is in VoutValue be more than VcompWhen, count
Control module CO segment count output switching activity times N, while a logic level is exported, logic level connection controlling switch
S so that the of short duration closures of controlling switch S, the output of integrating amplification circuit are pulled down to Vref, and the signal for completing a cycle is visited
Survey；After pulse signal ends, integrating amplification circuit, which starts again at, is acquired integration to signal, and process is repeated, repeatedly
Integration, and multiple stored counts are acquired to signal, the sampled signal that high temperature is expanded after investigative range can be obtained, controlled by feeding back
The Special controlling of loop processed, segment processing integrate, and reach the purpose for the circuit structure for expanding high temperature detection scope.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present invention, forms one of the application
Point, do not form the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is the circuit diagram of the infrared focal plane read-out circuit in one embodiment of the invention；
Fig. 2 is reading electricity of the infrared focal plane read-out circuit before and after investigative range is expanded in one embodiment of the invention
The comparison diagram of the voltage waveform view of road unit output.
Reference and corresponding parts title：10- reading circuit units, 20- feedback control loops.
Embodiment
In long-term research, inventor has found：In the prior art, the investigative range of traditional infrared circuit of focal plane readout
Receive the limitation of temperature so that the investigative range that reading circuit can be read is more narrow, exists so as to limit reading circuit
The use of some high temperature applicationss, thus the needs for expanding high temperature detection range circuit be present, based on this, inventors herein propose this Shen
Please in a kind of infrared focal plane read-out circuit and its feedback control loop.
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment and accompanying drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation are only used for explaining the present invention, do not make
For limitation of the invention.
In the following description, a large amount of specific details are elaborated in order to provide thorough understanding of the present invention.However, for this
Field those of ordinary skill it is evident that：The present invention need not be carried out using these specific details.In other instances, it is
The present invention that avoids confusion, does not specifically describe known structure, circuit, material or method.
【Embodiment 1】
As shown in figure 1, a kind of infrared focal plane read-out circuit of the present invention, including reading circuit unit 10 and feedback control loop
Road 20.
The reading circuit unit 10 includes signal biasing circuit and integrating amplification circuit；Signal biasing circuit is put to integration
Big circuit output infrared acquisition signal；Integrating amplification circuit includes integral amplifier F2 and electric capacity C；Integral amplifier F2 forward direction
Input connects a fixed potential Vref, and reverse input end connects signal biasing circuit so as to access infrared acquisition signal, defeated
Go out end output integral voltage Vout；The electric capacity C is connected between integral amplifier F2 reverse input end and output end, so as to
Integrating amplification circuit accesses infrared acquisition signal and infrared acquisition signal is integrated, and exports integral voltage Vout；
The feedback control loop 20 includes voltage comparator F1, count control module CO and controlling switch S, wherein：
The output end of voltage comparator F1 reverse input end connection integrating amplification circuit, voltage comparator F1's is positive defeated
Enter to terminate into a reference voltage signal Vcomp, voltage comparator F1 output end connection count control module CO input.
Integral voltage Vout integrating amplification circuit export so as to voltage comparator F1 is compared with reference voltage Vcomp, and general
Comparative result, which exports, gives count control module CO.The output end of foregoing integrating amplification circuit is integral amplifier F2 output
End, while be also the output end of reading circuit unit 10.
The count control module CO is counted according to the voltage comparator F1 comparative results exported, exports count value N,
And a pulse signal is exported when count value N changes and gives controlling switch S；
The output end of controlling switch S one end connection integrating amplification circuit, the other end connect a fixed potential Vref；
And the pulse signal that controlling switch S closure and shut-off are exported by count control module CO controls；When controlling switch S is closed,
The output end of integrating amplification circuit and fixed potential VrefConducting；Controlling switch S turn off when, the output end of integrating amplification circuit with
Fixed potential VrefDisconnect.
In the present embodiment, by increasing a feedback control loop 20 to traditional reading circuit, traditional infrared Jiao is realized
The expansion of the high temperature detection scope of plane reading circuit, feedback control loop 20 include a voltage comparator F1, a counting
A control module CO and logic control switch S.The inverting input of the voltage comparator F1 and integral amplifier F2's is defeated
Go out to hold VoutConnection, at the same with fixed potential VrefPlace branch road is connected, normal phase input end and reference level VcompConnection, its is defeated
Go out end to connect with count control module CO input.The input of the count control module CO is defeated with voltage comparator F1's
Go out end connection, count control module CO exports count value N by exporting the number of high level, and by a series of logics, control is patrolled
Controlling switch S closure and shut-off is collected, so as to control the current potential V that is connectedrefBranch road on or off.Controlling switch S's
One end is connected current potential Vref, the other end is connected to integral amplifier F2 output end.
The count control module is working as VoutValue be more than VcompWhen, count control module CO segment count output is turned over
Turn times N, while export a logic level, logic level connection controlling switch S so that the of short duration closures of controlling switch S.
It is briefly described as follows the operation principle of the infrared focal plane read-out circuit of the present embodiment.
In embodiment as shown in Figure 1, signal biasing circuit charges to integral amplifier F2 inverting input, due to electricity
Holding the voltage at C both ends can not be mutated, and the current potential of Vout output ends is linearly increasing with the increase in charging interval.When Vout current potential
When rising above voltage comparator F1 positive input current potential Vcomp, voltage comparator F1 output high level, input counts
Control module CO；Count control module CO receive voltage comparator F1 output high level after count value N value from plus 1, so
The times N of count control module CO output voltages comparator output high level afterwards, while export one high burst pulse level, logic
Controlling switch S turns in high level, moves integral amplifier F2 output terminal potential moment to VrefValue, the electric discharge of the process
Time can be neglected.After short duration potential terminates, signal biasing circuit, which starts again at, is acquired integration, process to signal
It is repeated, integration, and multiple stored counts is repeatedly acquired to signal, the sampling letter that high temperature is expanded after investigative range can be obtained
Number.
In the present embodiment, the count control module CO includes counting module and output of pulse signal module, the counting
Module is connected in voltage comparator F1 output end, is counted when receiving the high level of voltage comparator F1 outputs and defeated
Go out count value N and receive control signal to output of pulse signal module output control signal, the output of pulse signal module
When to controlling switch S send narrow pulse signal (pulsewidth can be neglected in follow-up calculate).
In other embodiments, count control module CO receives count value N after the high level that voltage comparator F1 is exported
Value from plus 1, a low burst pulse level can also be exported, accordingly logic control switch S turns in low level.
In the present embodiment, controlling switch S can be, but not limited to using relay, triode etc..Controlling switch S control terminal
(such as the contact of relay, ground level of triode) connection count control module CO causes switch in count control module CO arteries and veins
Rush the lower closure of signal control or shut-off, controlling switch S setting belong to prior art, repeated no more in the present embodiment.
Fig. 2 is the voltage waveform view comparison diagram for the reading circuit unit output expanded before and after investigative range, in Fig. 2,
Abscissa is temperature Temp, and ordinate is magnitude of voltage.
As shown in Fig. 2 the readout before expansion investigative range can read in temperature range, had in the prior art
Vout=A*Temp+B linear relationship, A and B are constant, when temperature is higher, after the detectable temperature T1 of its highest, and Vout
Reach saturation, no longer rise, therefore can not effectively be detected during high temperature range.But the infrared focal plane read-out circuit in the present embodiment
By carrying out repeated charge processing to integral amplifier F2 output result, its detectable temperature can be expanded, is effectively obtained
More than the probe value of temperature T1 parts, its corresponding actual voltage value V when temperature is T2OUTBe calculated as follows：
VOUT=N* (Vcomp-Vref)+Vout (1)
Wherein N represents the comparator output high level number exported after count control module is cumulative, and Vcomp represents voltage ratio
Inverting input reference voltage compared with device F1, Vref are the reference potential of integral amplifier F2 output end, and Vout represents current
The output valve of integral amplifier.So as to which by the calculating of formula (1), the V in the case of more than temperature T1 can be calculatedOUT's
Value, has largely expanded investigative range.In the prior art, due in integrating amplification circuit electric capacity C both end voltages can not dash forward
The characteristic of change, processed signal (infrared acquisition signal) is integrated.Voltage comparator F1's in feedback control loop 20
Inverting input connection integral amplifier F2 output end, at the same with fixed potential VrefPlace branch road is connected, with processed
Charging of the signal to electric capacity C, VoutVoltage rises, and integrating amplification circuit investigative range is stored charge capability and temperature by electric capacity C
Limitation, it is more narrow.By the Special controlling of feedback control loop 20 in the present embodiment, segment processing integration, it is high to reach expansion
The purpose of the circuit structure of warm investigative range.
【Embodiment 2】
On the basis of embodiment 1, also feedback control loop is improved as follows in the present embodiment：
The feedback control loop 20 also includes being used for the reference voltage unit circuit for providing reference voltage signal, with reference to electricity
Press the output end connection voltage comparator F1 of element circuit positive input.In the present embodiment, reference voltage unit circuit bag
Power supply and the resistance of two series connection are included, for two resistant series between power supply and ground, the common port of two resistance is with reference to electricity
The output end of element circuit is pressed, voltage comparator F1 positive input is connected on the common port of two resistance.
【Embodiment 3】
On the basis of embodiment 1 or embodiment 2, also infrared focal plane read-out circuit is changed as follows in the present embodiment
Enter：
Infrared focal plane read-out circuit also includes being used for the fixed potential branch road for providing fixed potential Vref, fixed potential branch
The output end on road connects the controlling switch S other end and integrating amplification circuit simultaneously.
【Embodiment 4】
On the basis of embodiment 1, also feedback control loop is improved as follows in the present embodiment：
Feedback control loop also includes being used for providing fixed potential Vref fixed potential branch road, fixed potential branch road it is defeated
Go out end while connect the controlling switch S other end and integrating amplification circuit.
From embodiment 3 and embodiment 4 as can be seen that fixed potential branch road is used for the output end and just to voltage comparator F1
Fixed potential is provided to input, it can be located in feedback control loop or be independently present in infrared focal plane read-out circuit
In.
In practical application, fixed potential branch road includes a voltage source, and the voltage source connects voltage comparator F1's simultaneously
The other end of output end and controlling switch S.
【Embodiment 5】
On the basis of any of the above-described embodiment, also feedback control loop is improved as follows in the present embodiment：
The reading circuit unit 10 is using the integrated reading circuit of row level, also known as row level reading circuit.
In Fig. 1, the signal biasing circuit includes converter VDAC1And VDAC2, metal-oxide-semiconductor M1, metal-oxide-semiconductor M2, pixel resistance Rs
With blind pixel resistance Rb.Converter VDAC1Output end connection metal-oxide-semiconductor M2Grid, converter VDAC2Output end connection metal-oxide-semiconductor
M1Grid, blind pixel resistance Rb, metal-oxide-semiconductor M2, metal-oxide-semiconductor M1, pixel resistance RsIt is sequentially connected in series；Pixel resistance RsOne end is grounded, separately
One end connection metal-oxide-semiconductor M1, flow through pixel resistance RsElectric current be Is；Blind pixel resistance RbConnect one end access voltage VSK, the other end
Connect metal-oxide-semiconductor M2, flow through blind pixel resistance RbElectric current be Ib.Integral amplifier F2Reverse input end be connected to metal-oxide-semiconductor M2With
Metal-oxide-semiconductor M1Common port on.
Row level reading circuit in the present embodiment is by (the converter V of DAC on pieceDAC1And VDAC2) the corresponding biasing metal-oxide-semiconductor of control
(M2And M1), so as to adjust the bias state of pixel (or blind pixel), Nonuniformity Correction on piece is realized, is traditional reading electricity
Line structure.So as to which reading circuit unit 10 is by providing each pixel different bias voltages in the present embodiment, to CMOS tube
Grid end apply voltage, pass through couple pixel resistance R being thermally isolated with substratesBranch road and the blind pixel resistance R with substrate heat short circuitb
The electric current of branch road compares, and charging sampling is carried out to integral amplifier F2 electric capacity C.
Above-described embodiment, the purpose of the present invention, technical scheme and beneficial effect are carried out further
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., all should include
Within protection scope of the present invention.
Claims (10)
1. a kind of infrared focal plane read-out circuit, including reading circuit unit (10), the reading circuit unit (10) includes product
Divide amplifying circuit；The integrating amplification circuit accesses infrared acquisition signal and infrared acquisition signal is integrated, and exports product
Component voltage Vout；Characterized in that, the infrared focal plane read-out circuit also includes feedback control loop (20)；
The feedback control loop (20) includes voltage comparator F1, count control module CO and controlling switch S, wherein：
The integral voltage Vout that the voltage comparator F1 exports integrating amplification circuit compared with reference voltage Vcomp,
And comparative result is exported and gives count control module CO；
The count control module CO is counted according to the voltage comparator F1 comparative results exported, output count value N, and
Count value N exports a pulse signal and gives controlling switch S when changing；
The output end of controlling switch S one end connection integrating amplification circuit, the other end connect a fixed potential Vref；And control
The pulse signal that system switch S closure and shut-off are exported by count control module CO controls.
2. a kind of infrared focal plane read-out circuit according to claim 1, it is characterised in that the voltage comparator F1's
The output end of reverse input end connection integrating amplification circuit, positive input access reference voltage signal Vcomp, output end connection
Count control module CO input.
A kind of 3. infrared focal plane read-out circuit according to claim 2, it is characterised in that the integrating amplification circuit bag
Include integral amplifier F2 and electric capacity C；The positive input of the integral amplifier F2 is connected current potential Vref, reverse input end
Infrared acquisition signal is accessed, output end connection voltage comparator F1 reverse input end simultaneously exports integral voltage Vout simultaneously；Institute
Electric capacity C is stated to be connected between integral amplifier F2 reverse input end and output end.
A kind of 4. infrared focal plane read-out circuit according to claim 3, it is characterised in that the feedback control loop
(20) also include being used for the reference voltage unit circuit that reference voltage signal is provided, the output end connection of reference voltage unit circuit
Voltage comparator F1 positive input.
5. a kind of infrared focal plane read-out circuit according to any one of claims 1 to 4, it is characterised in that described to read electricity
Road unit (10) is the reading circuit that row level integrates.
6. a kind of infrared focal plane read-out circuit according to any one of claims 1 to 4, it is characterised in that also include being used for
Fixed potential Vref fixed potential branch road is provided, the output end of fixed potential branch road connects the controlling switch S other end simultaneously
And integrating amplification circuit.
7. a kind of infrared focal plane read-out circuit according to any one of claims 1 to 4, it is characterised in that described to read electricity
Road unit (10) also includes signal biasing circuit, the input of the output end connection integrating amplification circuit of the signal biasing circuit
End, infrared acquisition signal is exported to integrating amplification circuit.
A kind of 8. feedback control loop of infrared focal plane read-out circuit, it is characterised in that the feedback control loop with it is infrared
The output end of the reading circuit unit (10) of circuit of focal plane readout is connected, and the feedback control loop includes voltage comparator
F1, count control module CO and controlling switch S, wherein：
The voltage that the voltage comparator F1 exports reading circuit unit (10) is incited somebody to action compared with reference voltage Vcomp
Comparative result, which exports, gives count control module CO；
The comparative result that the count control module CO exports according to voltage comparator F1 carry out count output count value N, and
Count value N exports a pulse signal and gives controlling switch S when changing；
The output end of controlling switch S one end connection reading circuit unit (10), the other end connect a fixed potential Vref；
And the pulse signal that controlling switch S closure and shut-off are exported by count control module CO controls.
9. the feedback control loop of a kind of infrared focal plane read-out circuit according to claim 8, it is characterised in that described
The output end of voltage comparator F1 reverse input end connection reading circuit unit (10), positive input access reference voltage
Vcomp, output end connection count control module CO.
A kind of 10. feedback control loop of infrared focal plane read-out circuit according to claim 9, it is characterised in that institute
Stating feedback control loop (20) also includes being used for the reference voltage unit circuit for providing reference voltage signal, reference voltage unit electricity
The output end connection voltage comparator F1 on road positive input.
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| CN201710828566.7A CN107517354B (en) | 2017-09-14 | 2017-09-14 | Infrared focal plane reading circuit and feedback control loop thereof |
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| CN201710828566.7A CN107517354B (en) | 2017-09-14 | 2017-09-14 | Infrared focal plane reading circuit and feedback control loop thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146178A (en) * | 2019-04-29 | 2019-08-20 | 北京安酷智芯科技有限公司 | A kind of reading circuit and its working method |
| CN116972981A (en) * | 2023-07-31 | 2023-10-31 | 无锡物联网创新中心有限公司 | Readout method and readout device of thermopile sensor |
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|---|---|
| CN107517354B (en) | 2020-02-07 |
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