CN106791512A - A kind of automatic adjustable reading circuit of integrating capacitor - Google Patents
A kind of automatic adjustable reading circuit of integrating capacitor Download PDFInfo
- Publication number
- CN106791512A CN106791512A CN201611071842.1A CN201611071842A CN106791512A CN 106791512 A CN106791512 A CN 106791512A CN 201611071842 A CN201611071842 A CN 201611071842A CN 106791512 A CN106791512 A CN 106791512A
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- type flip
- flip flop
- integrating capacitor
- reading circuit
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- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/50—Control of the SSIS exposure
- H04N25/53—Control of the integration time
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/50—Control of the SSIS exposure
- H04N25/57—Control of the dynamic range
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
Abstract
The invention discloses a kind of automatic adjustable reading circuit of integrating capacitor, it is characterized in that amplifier reading circuit is provided with the auto-control that conditioned circuit is integrated electric capacity, the automatic conditioned circuit is by Schmidt trigger L and d type flip flop D 1With d type flip flop D 2Composition, output end and the d type flip flop D of the Schmidt trigger L 1With d type flip flop D 2Clk ends and connect, the input of Schmidt trigger L be connected with the output end of transport and placing device OP after for VoutEnd；D type flip flop D 1Q ends and d type flip flop D 2D ends connection；The d type flip flop D 1Q ends and d type flip flop D 2D ends and switch K is accessed after connecing2It is integrated the auto-control of electric capacity；The d type flip flop D 2Q terminate into switch K1It is integrated the auto-control of electric capacity.The present invention has simple structure compared with prior art, and sensitivity is high, and the regulation of gain is more flexible, improves the intellectuality of circuit, also increases the dynamic range of reading circuit, realizes the reading of Larger Dynamic scope.
Description
Technical field
The present invention relates to photodetection reading circuit technical field, especially a kind of dynamic wide and intensity of illumination scope is wider
The automatic adjustable reading circuit of integrating capacitor.
Background technology
At present, photodetector and solid state image sensor reading circuit, process the integrating capacitor size of faint photoelectric current
It is fixed, when using small integrating capacitor, the sensitivity of reading circuit and signal to noise ratio are higher, but dynamic range reduces, and
During using big integrating capacitor, charge capacity can be increased, so as to increased dynamic range, but signal to noise ratio and sensitivity can all subtract
It is small, cause circuit to decline the resolution capability of low current, lost the details of darker area in image scene.In order to clear
Display inspected object details, it is necessary to reading circuit can be good to the dim light part of inspected object and highlights
Carry out signal to read and process, extended dynamic scope and raising sensitivity are more and more important.In view of quantum dot optoelectronic detection
The photosensitive strength range of device is especially wide, and light excitation current can be pA, nA and μ A magnitude even more highs, and photoelectric current scope wider is to reading
Go out circuit and propose requirement, high sensitivity advantage should be considered, also to avoid the generation of saturation.
Based on problem above, the solution of existing reading circuit is to introduce the adjustable structure of integrating capacitor, i.e., using not
With the integrating capacitor of size, different size of combination is realized by switching the break-make of control integrating capacitor.However, what is switched closes
Conjunction is very inconvenient in use by controlling manually, and frequent plug ground lead accurately affects greatly to circuit,
Intelligentized development trend is not met.
The content of the invention
Dynamic a kind of wide that the purpose of the present invention is directed to the deficiencies in the prior art and provides and intensity of illumination scope is wider
The automatic adjustable reading circuit of integrating capacitor, using the integrating capacitor auto-control circuit of Schmidt trigger, in small integration electricity
When appearance saturation occurs soon, reading circuit is automatic jumped to big integrating capacitor, integrating capacitor is expanded automatically, substantially increase circuit
Intellectuality, also increase the dynamic range of reading circuit, sensitivity and signal to noise ratio is greatly improved, realize Larger Dynamic model
The reading enclosed, it is ensured that picture quality.
The object of the present invention is achieved like this：A kind of automatic adjustable reading circuit of integrating capacitor, including by transport and placing device
OP, integrating capacitor Ca、Cb、CcWith switch K1、K2The capacitive feedback transimpedance amplifier reading circuit of composition, integrating capacitor CcWith switch
K2It is the first branch to concatenate, integrating capacitor CbWith switch K1It is the second branch to concatenate, integrating capacitor CaWith the first branch and second point
Road is attempted by the inverting input and output end of transport and placing device OP, and photoelectric detector PD is connected to the inverting input of transport and placing device OP
On, the normal phase input end of transport and placing device OP is Vref, it is characterized in that capacitive feedback transimpedance amplifier reading circuit is provided with automatic adjustable electric
Road is integrated the auto-control of electric capacity, and the automatic conditioned circuit is by anti-phase output Schmidt trigger L and d type flip flop D1With
D type flip flop D2Composition, output end and the d type flip flop D of the anti-phase output Schmidt trigger L1With d type flip flop D2Clk ends simultaneously
Connect, the input of anti-phase output Schmidt trigger L be connected with the output end of transport and placing device OP after for VoutEnd；The d type flip flop D1
D termination voltages source VDDD, d type flip flop D1Q ends and trigger D2D ends connection；First branch is by d type flip flop D1Q
End and d type flip flop D2D ends and switch K is accessed after connecing2It is integrated the auto-control of electric capacity；Second branch is by d type flip flop
D2Q terminate into switch K1It is integrated the auto-control of electric capacity.
The negative sense threshold voltage V of the anti-phase output Schmidt trigger LT-It is 0.18V, forward threshold voltage VT+For
0.3V。
The present invention has simple structure compared with prior art, and sensitivity is high, and the regulation of gain is more flexible, integrating capacitor
Control it is rapider, improve the intellectuality of circuit, also increase the dynamic range of reading circuit, be greatly improved sensitive
Degree and signal to noise ratio, realize the reading of Larger Dynamic scope, it is ensured that picture quality.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention；
Fig. 2 is the automatic conditioned circuit output curve diagram of integrating capacitor.
Specific embodiment
Refering to accompanying drawing 1, the present invention is made up of capacitive feedback transimpedance amplifier reading circuit 1 and automatic conditioned circuit 2, described
Capacitive feedback transimpedance amplifier reading circuit 1 is by transport and placing device OP, integrating capacitor Ca、Cb、CcWith switch K1、K2Composition；The integration
Electric capacity CcWith switch K2It is the first branch to concatenate, integrating capacitor CbWith switch K1It is the second branch to concatenate；The integrating capacitor CbWith
Switch K1It is the second branch to concatenate, integrating capacitor CaWith the inverting input that the first branch and the second branch are attempted by transport and placing device OP
In output end, photoelectric detector PD is connected on the inverting input of transport and placing device OP, and the normal phase input end of transport and placing device OP is
Vref。
The automatic conditioned circuit 2 is by anti-phase output Schmidt trigger L and d type flip flop D1With d type flip flop D2Composition, institute
State the output end and d type flip flop D of anti-phase output Schmidt trigger L1With d type flip flop D2Clk ends and connect, anti-phase output is applied close
The input of special trigger L is V after being connected with the output end of transport and placing device OPoutEnd；The d type flip flop D1D termination voltages source
VDDD, d type flip flop D1Q ends and d type flip flop D2D ends connection；First branch is by d type flip flop D1Q ends and d type flip flop D2
D ends and switch K is accessed after connecing2It is integrated the auto-control of electric capacity；Second branch is by d type flip flop D2Q terminate into opening
Close K1It is integrated the auto-control of electric capacity.The Schmidt trigger negative sense threshold voltage VT-It is 0.18V, forward threshold voltage
VT+It is 0.3V, works as VoutProgressively decline with the time, when dropping to 0.18V, it is high level that now trigger output voltage is jumped, saltus step
Rising edge trigger switch K1Uprise (VDDD) so that switch K1Closure, electric capacity CbParticipate in integrating, now reading circuit total mark
Electric capacity is Ca+Cb, VoutBy (Vref-I0T/C0) saltus step be [Vref-IOT/(C0+C1)], VoutSaltus step it is complete in a short period of time
Into during this, although VoutTouch VT+Anti-phase output Schmidt trigger L output voltages are made to be reduced to low level, but trailing edge
Do not influence to switch K1Trigger D1, so switch K1Still keep VDDDHigh level state, integrating capacitor CbAlways involved in integration.With
Time growth, as new VoutWhen being re-lowered to 0.18V, the now output of anti-phase output Schmidt trigger L again by
Low high jump, under rising edge triggering so that K2=K1=VDDD, so as to by switching K2Closure, CcIntegration is participated in, now total mark electricity
It is C to holda+Cb+Cc, VoutFrom [Vref-I0T/(C0+C1)] saltus step is into [Vref-I0T/(C0+C1+C2)]。
According to capacitive feedback across the output characteristics of scale-up version input stage is hindered from following formula (a), in certain photoelectric current and product
Divide in the case of electric capacity, VoutIt is linear with the time, it is known that as time T=VrefCa/I0When, it is integrating capacitor CaReading electricity
Road exports saturation.To avoid this type of circumstances from happening, in VoutWhen being soon reduced to 0V, make control integrating capacitor CbSwitch K1Immediately
Closure, integrating capacitor CbAdd, so as to increase total mark electric capacity so that VoutIt is C to be changed into total mark electric capacitya+CbUnder output electricity
Pressure, i.e. following formula (b)；Such as need further to increase integrating capacitor, can similarly introduce Cc, then in Ca+CbMake control C during fast saturationcOpen
Close K2Close immediately, so that total mark electric capacity is Ca+Cb+Cc, output characteristics such as following formula (c)：
Refering to accompanying drawing 2, analyzed more than, T in its function curve such as figure0、T1And T2Respectively (Vref-0.18)C0/
I0、(Vref-0.18)(C0+C1)/I0And Vref(C0+C1+C2)/I0。
Automatically adjustable output characteristics is the integrating capacitor：VoutBe time T piecewise function, such as following formula (d) institute
Show：
The present invention works as integrating capacitor CaOutput when being soon reduced to 0V, make control CbSwitch K1Close immediately, integrating capacitor
Add Cb, so as to increase Global integration electric capacity so that VoutIt is C to be changed into integrating capacitora+CbUnder output voltage；Similarly in Ca+Cb
Make control C during fast saturationcSwitch K2Close immediately, so that total mark electric capacity is Ca+Cb+Cc, this integrating capacitor is automatically adjustable
Design improve the intellectuality of circuit, also increase the dynamic range of reading circuit.
Above example is that the present invention will be further described, and is not used to limit patent of the present invention, and all is the present invention
Equivalence enforcement, is intended to be limited solely by within the right of patent of the present invention.
Claims (2)
1. the automatic adjustable reading circuit of a kind of integrating capacitor, including by transport and placing device OP, integrating capacitor Ca、Cb、CcWith switch K 1、
K 2The capacitive feedback transimpedance amplifier reading circuit of composition, integrating capacitor CcWith switch K2It is the first branch to concatenate, integrating capacitor Cb
With switch K1It is the second branch to concatenate, integrating capacitor CaWith the anti-phase input that the first branch and the second branch are attempted by transport and placing device OP
On end and output end, photoelectric detector PD is connected on the inverting input of transport and placing device OP, and the normal phase input end of transport and placing device OP is
Vref, it is characterised in that capacitive feedback transimpedance amplifier reading circuit is provided with the automatic tune that automatic conditioned circuit is integrated electric capacity
Control, the automatic conditioned circuit is by anti-phase output Schmidt trigger L and d type flip flop D 1With d type flip flop D 2Composition, it is described anti-
Mutually export the output end and d type flip flop D of Schmidt trigger L 1With d type flip flop D 2Clk ends and connect, anti-phase output Schmidt
The input of trigger L is V after being connected with the output end of transport and placing device OPoutEnd；The d type flip flop D 1D termination voltages source VDDD,
D type flip flop D 1Q ends and d type flip flop D 2D ends connection；First branch is by d type flip flop D 1Q ends and d type flip flop D 2's
Switch K is simultaneously accessed after connecing in D ends2It is integrated the auto-control of electric capacity；Second branch is by d type flip flop D 2Q terminate into opening
Close K1It is integrated the auto-control of electric capacity.
2. the automatic adjustable reading circuit of integrating capacitor according to claim 1, it is characterised in that the anti-phase output applies close
The negative sense threshold voltage V of special trigger LT-It is 0.18 V, forward threshold voltage VT+It is 0.3 V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611071842.1A CN106791512B (en) | 2016-11-29 | 2016-11-29 | A kind of integrating capacitor adjustable reading circuit automatically |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611071842.1A CN106791512B (en) | 2016-11-29 | 2016-11-29 | A kind of integrating capacitor adjustable reading circuit automatically |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106791512A true CN106791512A (en) | 2017-05-31 |
| CN106791512B CN106791512B (en) | 2019-07-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611071842.1A Active CN106791512B (en) | 2016-11-29 | 2016-11-29 | A kind of integrating capacitor adjustable reading circuit automatically |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110336553A (en) * | 2019-06-06 | 2019-10-15 | 上海集成电路研发中心有限公司 | A kind of output circuit adjusting dynamic range |
| CN112954237A (en) * | 2021-02-07 | 2021-06-11 | 电子科技大学 | Self-adaptive variable gain integrating circuit for photoelectric detector |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1950684A (en) * | 2004-05-10 | 2007-04-18 | 浜松光子学株式会社 | Photo detector apparatus |
| CN102291544A (en) * | 2011-06-22 | 2011-12-21 | 华东师范大学 | Amplifier read-out circuit with automatic adjustable gain |
| CN102523394A (en) * | 2011-11-23 | 2012-06-27 | 华东师范大学 | Photoelectric conversion front-end detection-type readout circuit with automatically adjustable gain |
| EP2645707A2 (en) * | 2012-03-28 | 2013-10-02 | Luxen Technologies, Inc. | Increasing dynamic range for x-ray image sensor |
| EP2924979A1 (en) * | 2014-03-25 | 2015-09-30 | IMEC vzw | Improvements in or relating to imaging sensors |
-
2016
- 2016-11-29 CN CN201611071842.1A patent/CN106791512B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1950684A (en) * | 2004-05-10 | 2007-04-18 | 浜松光子学株式会社 | Photo detector apparatus |
| CN102291544A (en) * | 2011-06-22 | 2011-12-21 | 华东师范大学 | Amplifier read-out circuit with automatic adjustable gain |
| CN102523394A (en) * | 2011-11-23 | 2012-06-27 | 华东师范大学 | Photoelectric conversion front-end detection-type readout circuit with automatically adjustable gain |
| EP2645707A2 (en) * | 2012-03-28 | 2013-10-02 | Luxen Technologies, Inc. | Increasing dynamic range for x-ray image sensor |
| EP2924979A1 (en) * | 2014-03-25 | 2015-09-30 | IMEC vzw | Improvements in or relating to imaging sensors |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110336553A (en) * | 2019-06-06 | 2019-10-15 | 上海集成电路研发中心有限公司 | A kind of output circuit adjusting dynamic range |
| CN112954237A (en) * | 2021-02-07 | 2021-06-11 | 电子科技大学 | Self-adaptive variable gain integrating circuit for photoelectric detector |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106791512B (en) | 2019-07-26 |
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