CN104348448B - Ramp signal generator - Google Patents
Ramp signal generator Download PDFInfo
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- CN104348448B CN104348448B CN201310322753.XA CN201310322753A CN104348448B CN 104348448 B CN104348448 B CN 104348448B CN 201310322753 A CN201310322753 A CN 201310322753A CN 104348448 B CN104348448 B CN 104348448B
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Abstract
A kind of ramp signal generator, comprising：Bias storage circuit, integrating circuit and feedback circuit.The bias storage circuit is used for received in sequence control voltage and inversion signal, and produces preliminary voltage signal and target voltage signal according to this respectively.The integrating circuit is coupled to the bias storage circuit, for the operation being sequentially integrated to the preliminary voltage signal and the target voltage signal, to produce preliminary ramp signal and target ramp signal respectively.The feedback circuit is coupled between the integrating circuit and the bias storage circuit, for producing the inversion signal according to the preliminary ramp signal, and the inversion signal is fed back to the bias storage circuit.
Description
Technical field
The present invention relates to a kind of ramp signal generator, the ramp signal of espespecially a kind of bias for eliminating self generation
Generator.
Background technology
In general, voltage integrator is often used in the framework of Image Sensor, so as to less power consumption come
Reach higher switching rate.For example, for the generation of ramp signal, voltage integrator is that saving power consumption is good
Select.However, for small-signal, by the impact caused by the bias produced by voltage integrator being can not be ignored
's.Therefore need to propose a kind of ramp signal generator of the bias that can eliminate self generation.
The content of the invention
Therefore, an object of the present invention is to propose that a kind of ramp signal of the bias for eliminating self generation produces dress
Put, it is above-mentioned to solve the problems, such as.
According to embodiments of the invention, a kind of its ramp signal generator of announcement.The ramp signal generator is included
There are bias storage circuit, integrating circuit and feedback circuit.The bias storage circuit be used for received in sequence control voltage with it is anti-phase
Signal, and produce preliminary voltage signal and target voltage signal according to this respectively.The integrating circuit is coupled to the bias storage circuit,
For the operation being sequentially integrated to the preliminary voltage signal and the target voltage signal, to produce preliminary ramp signal respectively
With target ramp signal.The feedback circuit is coupled between the integrating circuit and the bias storage circuit, for preliminary according to this
Ramp signal produces the inversion signal, and the inversion signal is fed back to the bias storage circuit.
From the foregoing, it will be observed that the present invention provides a kind of ramp signal generator, its can be fed back by negative eliminating because
By the bias produced by operational amplifier, the ramp signal for affecting is not biased against to produce.
Description of the drawings
Fig. 1 is the schematic diagram of the embodiment of ramp signal generator of the present invention.
Fig. 2A is the sequential chart of the embodiment of the control signal of bias storage circuit in Fig. 1.
Fig. 2 B are the sequential chart of the embodiment of the control signal of integrating circuit in Fig. 1.
Fig. 2 C are the sequential chart of the embodiment of the control signal of feedback circuit in Fig. 1.
Specific embodiment
Some vocabulary used in are censuring specific element in description and follow-up claim.Art technology
Personnel are, it is to be appreciated that hardware manufacturer may call same element with different nouns.This specification and follow-up power
Profit is required not in the way of the difference of title is used as distinguishing element, but the difference with element functionally is used as distinguishing
Criterion.In the whole text, the "comprising" of description and follow-up claim mentioned in is open term, therefore should be explained
Into " include but be not limited to ".In addition, " coupling " word here includes any directly and indirectly electrical connection.Therefore,
If first device is coupled to second device described in text, represents the first device and can directly be electrically connected in the second device,
Or be electrically connected to the second device indirectly by other devices or connection means.
Fig. 1 is refer to, Fig. 1 is the schematic diagram of the embodiment of ramp signal generator of the present invention 100.Ramp signal is produced
Device 100 includes（But it is not limited to）Bias storage circuit 120, integrating circuit 140 and feedback circuit 160.Bias storage
Circuit 120 includes（But it is not limited to）Operational amplifier 122_1, multiple electric capacity 124_1～124_2 and multiple switch 126_
1～126_4.Operational amplifier 122_1 has normal phase input end IN1+It is coupled to reference voltage（For example, ground voltage VGNDOr its
His predetermined voltage level）, inverting input IN1-, and outfan OUT1It is coupled to integrating circuit 140.Electric capacity 124_1 has the
One connection end E11And the second connection end E12, the first connection end E11It is coupled to the outfan OUT of operational amplifier 122_11, and
And the second connection end E12It is coupled to the inverting input IN of operational amplifier 122_11-.Electric capacity 124_2 has the first connection end E21
And the second connection end E22.Switch 126_1 is controlled by control signal SC1, with optionally by the defeated of operational amplifier 122_1
Go out to hold OUT1It is connected to the inverting input IN of operational amplifier 122_11-.Switch 126_2 is controlled by control signal SC2, with
Optionally by the first connection end E of electric capacity 124_221It is connected to the inverting input IN of operational amplifier 122_11-.Switch
126_3 is controlled by control signal SC3, with optionally by the second connection end E of electric capacity 124_222It is connected to reference voltage (example
Such as VGND).Switch 126_4 is controlled by control signal SC4, with optionally by the second connection end E of electric capacity 124_222It is connected to
Control voltage VCTRL。
Additionally, integrating circuit 140 includes（But it is not limited to）Second operational amplifier 122_2, multiple electric capacity 124_3～
124_4 and multiple switch 126_5～126_9.Operational amplifier 122_2 has normal phase input end IN2+, inverting input IN2-
And outfan OUT2.Normal phase input end IN2+It is coupled to reference voltage (such as VGND), and outfan OUT2It is coupled to feedback
Circuit 160.Electric capacity 124_3 has the first connection end E31And the second connection end E32, the first connection end E31It is coupled to amplifier
The outfan OUT of 122_22, and the second connection end E32It is coupled to the inverting input IN of operational amplifier 122_22-.Electric capacity
126_4 has the first connection end E41And the second connection end E42.Switch 126_5 is controlled by control signal SC5, with selectivity
Ground is by the outfan OUT of operational amplifier 122_22It is connected to the inverting input IN of operational amplifier 122_22-.Switch 126_6
Controlled by control signal SC6, with optionally by the first connection end E of electric capacity 124_441It is connected to operational amplifier 122_2
Inverting input IN2-.Switch 126_7 is controlled by control signal SC7, optionally to connect the first of electric capacity 124_4
End E42It is connected to reference voltage (such as VGND).Switch 126_8 is controlled by control signal SC8, with optionally by electric capacity 124_
4 the second connection end E42It is connected to reference voltage (such as VGND).Switch 126_9 is controlled by control signal SC9, with selectivity
Ground is by the second connection end E of electric capacity 124_442It is connected to the outfan OUT of operational amplifier 122_11。
Additionally, feedback circuit 160 includes（But it is not limited to）Electric capacity 124_5 and multiple switch 126_10～126_
11.Electric capacity 124_5 has the first connection end E51With the second connection end E52, and the first connection end E51It is coupled to the of electric capacity 124_2
One connection end E21.Switch 126_10 is controlled by control signal SC10, so that integrating circuit 140 is connected to electric capacity optionally
The second connection end E of 124_552.Switch 126_11 is controlled by control signal SC11, with optionally by the of electric capacity 124_5
Two connection end E52It is connected to reference voltage VGND。
In the present embodiment, bias storage circuit 120 and receive control voltage V firstCTRLAnd according to control voltage VCTRLIt is negative
Phase voltage is producing preliminary voltage signal SPREL, now preliminary voltage signal SPRELIn can include because by bias storage electricity
Bias V produced by road 120off1（That is, SPREL=-VCTRL+Voff1）.Then, the preliminary voltage signal S of 140 pairs, integrating circuitPREL
The operation being integrated is producing preliminary ramp signal S_RAMPPREL, now preliminary ramp signal S_RAMPPRELIn can wrap simultaneously
Containing because by biasing the bias V produced by storage circuit 120off1And because by inclined produced by integrating circuit 140
Pressure Voff2（That is, S_RAMPPREL=-VCTRL+Voff1+Voff2）.Feedback circuit 160 is according to preliminary ramp signal S_RAMPPRELTo produce
The preliminary ramp signal S_RAMP of lifePRELInversion signal SINV（That is,-(- VCTRL+Voff1+Voff2)）, and by inversion signal SINV
Feed back to bias storage circuit 120.
Receiving inversion signal SINVAfterwards, storage circuit 120 is biased according to inversion signal SINVTo produce target voltage signal
STGRT, now target voltage signal STGRTIn bias component-Voff1Can with because by bias storage circuit 120 produced by
Bias Voff1Mutually offset.Then, integrating circuit 140 is to target voltage signal STGRTThe operation being integrated, it is oblique to produce target
Slope signal S_RAMPTGRT, now target ramp signal S_RAMPTGRTIn bias component-Voff2Can with because pass through integrating circuit
Bias V produced by 140off2Mutually offset.Therefore, the target ramp signal S_RAMP for finally obtainingTGRTControl can be just equal to
Voltage VCTRL.In other words, through the target ramp signal S_RAMP produced by ramp signal generator 100TGRTWill not receive
To the impact caused by the bias produced by integrating gear.
Fig. 2A is refer to, Fig. 2A is the sequential chart of the embodiment of the control signal of bias storage circuit 120 in Fig. 1.By scheming
2A understands that control signal SC1, SC2, SC4 difference controlling switches 126_1,126_2,126_4 are in time t1It is opened
(switched on), so that electric capacity 124_2 passes through control voltage VCTRLNegative voltage carrying out discharge and recharge.Control signal
SC1, SC4 distinguish controlling switch 126_1,126_4 in time t2It is closed (switched off) to terminate filling for electric capacity 124_2
The operation of electric discharge.The now second connection end E of electric capacity 124_222Voltage quasi position should be equal to-VCTRL, and due to electric capacity 124_2
The first connection end E21With the normal phase input end IN of operational amplifier 122_11+Between form imaginary short（virtual short）,
Therefore the first connection end E of electric capacity 124_221Voltage quasi position should be equal to reference voltage VGNDVoltage quasi position.Then, control signal
SC3 controlling switches 126_3 are in time t2It is opened, so that the first connection end E of electric capacity 124_221Voltage quasi position be adjusted
To (VGND-VCTRL), and cause electric capacity 124_1 to pass through voltage (VGND-VCTRL) carrying out discharge and recharge.The control of control signal SC3 is opened
126_3 is closed in time t3It is turned off to the operation of the discharge and recharge of end electric capacity 124_1.As electric capacity 124_1 carries out discharge and recharge
During, voltage signal (VGND-VCTRL) bias V can be produced through operational amplifier 122_1off1, therefore the of electric capacity 124_1
One connection end E11Voltage can be equal to VGND-VCTRL+Voff1（That is, preliminary voltage signal SPREL）.
Please continue to refer to Fig. 2 B, Fig. 2 B are the sequential chart of the embodiment of the control signal of integrating circuit 140 in Fig. 1.By scheming
2B understands that control signal SC7, SC9 distinguishes controlling switch 126_7,126_9 in time t4It is opened so that electric capacity 124_4 leads to
Cross preliminary voltage signal SPRELTo carry out discharge and recharge.In order that the charge and discharge of electric capacity 124_4 is electrically operated more stable, control signal SC7
Controlling switch 126_7 is in time t5It is closed, and control signal SC9 controlling switch 126_9 is in time t5’It is turned off to terminate
The operation of the discharge and recharge of electric capacity 124_4（That is, switch 126_7 relatively switchs 126_9 and is early closed）.Now the of electric capacity 124_4
One connection end E41Voltage quasi position should be equal to VGND-VCTRL+Voff1, and the second connection end E of electric capacity 124_442Voltage quasi position
Reference voltage V should be equal toGNDVoltage quasi position.Then, control signal SC6, SC8 controlling switch 126_6,126_8 is in time t6Quilt
It is opened so that electric capacity 124_3 passes through voltage (VGND-VCTRL+Voff1) carrying out discharge and recharge.Control signal SC6 controlling switch 126_
6 in time t7It is closed, and control signal SC8 controlling switch 126_8 is in time t7’It is turned off to terminate filling for electric capacity 124_3
The operation of electric discharge（That is, switch 126_6 relatively switchs 126_8 and is early closed）.As electric capacity 124_3 carries out the process of discharge and recharge
In, voltage signal (VGND-VCTRL+Voff1) bias V can be produced through operational amplifier 122_2off2, therefore electric capacity 124_3
First connection end E31Voltage can be equal to VGND-VCTRL+Voff1+Voff2（That is, preliminary ramp signal S_RAMPPREL）.
Please continue to refer to Fig. 2 C, Fig. 2 C are the sequential chart of the embodiment of the control signal of feedback circuit 160 in Fig. 1.By scheming
2C understands that control signal SC1, SC2, SC10 difference controlling switches 126_1,126_2,126_10 are in time t8It is opened so that
Electric capacity 124_5 passes through preliminary ramp signal S_RAMPPRELTo carry out discharge and recharge.Control signal SC1, SC10 distinguishes controlling switch
126_1,126_10 are in time t9It is turned off to the operation of the discharge and recharge of end electric capacity 124_5.Now the second of electric capacity 124_5 connects
Meet end E52Voltage quasi position can become-(VGND-VCTRL+Voff1+Voff2)（That is, inversion signal SINV）.Then, control signal
SC11 controlling switches 126_11 are in time t9It is opened so that electric capacity 124_1 passes through voltage signal-(VGND-VCTRL+Voff1+
Voff2) carrying out discharge and recharge.Control signal SC11 controlling switch 126_11 is in time t10It is turned off to terminate filling for electric capacity 124_5
The operation of electric discharge.During discharge and recharge is carried out due to electric capacity 124_1, voltage signal-(VGND-VCTRL+Voff1+Voff2) can pass through
Operational amplifier 122_1 and produce bias Voff1, therefore the first connection end E of electric capacity 124_111Voltage can be equal to VGND-VCTRL
+Voff2（That is, target voltage signal STGRT）.
Note that those skilled in the art should will readily appreciate that after the paragraph shown in Fig. 2 is read that target voltage is believed
Number STGRTTarget ramp signal S_RAMP is produced by integrating circuit 140TGRTOperation, describe in detail and change refer to before
State, for brevity, therefore just repeat no more in this.
Additionally, ramp signal generator of the present invention 100 separately can carry out weight by switching 126_5 to integrating circuit 140
The operation put（That is, by the outfan OUT of operational amplifier 122_22Voltage quasi position adjust to operational amplifier 122_2's
Inverting input IN2-Voltage quasi position）, for example, in the case where other switches are cut out, can pass through will switch
126_5 is turned off after opening a period of time, come the operation reset to integrating circuit 140.However, this only conduct is said for example
It is bright to be used, it is not intended as the restrictive condition of the present invention.
In sum, ramp signal generator of the present invention 100 can be eliminated by the feedback of negative because by computing
Bias produced by amplifier, and then produce the ramp signal for not being biased against affecting.
The foregoing is only the preferred embodiments of the present invention, all impartial changes done according to the claims in the present invention with repair
Decorations, should all belong to the covering scope of the present invention.
Claims (14)
1. a kind of ramp signal generator, comprising：
Bias storage circuit, for received in sequence control voltage and inversion signal, and produce respectively according to this preliminary voltage signal with
Target voltage signal；
Integrating circuit, is coupled to the bias storage circuit, for sequentially to the preliminary voltage signal and the target voltage
The operation that signal is integrated, to produce preliminary ramp signal and target ramp signal respectively；And
Feedback circuit, is coupled between the integrating circuit and the bias storage circuit, for believing according to the preliminary slope
Number the inversion signal is produced, and the inversion signal is fed back to into the bias storage circuit.
2. ramp signal generator as claimed in claim 1, wherein the bias storage circuit is included：
First operational amplifier, with normal phase input end, inverting input and outfan, the normal phase input end is coupled to ginseng
Voltage is examined, and the outfan is coupled to the integrating circuit；
First electric capacity, with the first connection end and the second connection end, first connection end is coupled to first computing and puts
The outfan of big device, and second connection end is coupled to the inverting input of first operational amplifier；
Second electric capacity, with the first connection end and the second connection end；
First switch, for being selectively connected the outfan of first operational amplifier with first operational amplifier
Inverting input；
Second switch, it is anti-with first operational amplifier for being selectively connected the first connection end of second electric capacity
Phase input；
3rd switch, for being selectively connected the second connection end of second electric capacity and the reference voltage；And
4th switch, for being selectively connected the second connection end of second electric capacity and the control voltage.
3. ramp signal generator as claimed in claim 2, wherein in the first period, the bias storage circuit is opened
The first switch, the second switch and the 4th switch, and close the 3rd switch and come according to the control
Voltage carries out discharge and recharge to second electric capacity.
4. ramp signal generator as claimed in claim 3, wherein in the second period after first period, institute
State bias storage circuit and open the 3rd switch, and close the first switch and the 4th switch comes to described the
One electric capacity carries out discharge and recharge to produce the preliminary voltage signal.
5. ramp signal generator as claimed in claim 2, wherein the feedback circuit is included：
3rd electric capacity, with the first connection end and the second connection end, first connection end is coupled to second electric capacity
First connection end；
5th switch, for being selectively connected the second connection end of the integrating circuit and the 3rd electric capacity；And
6th switch, for the second connection end for being selectively connected the 3rd electric capacity and the reference voltage.
6. ramp signal generator as claimed in claim 5, wherein in the first period, the feedback circuit is opened described
5th switchs and closes the 6th switch to carry out discharge and recharge to the 3rd electric capacity.
7. ramp signal generator as claimed in claim 6, wherein in the second period after first period, institute
State feedback circuit and open the described 6th and switch and close the 5th switch and come described according to the preliminary ramp signal generation
Inversion signal.
8. ramp signal generator as claimed in claim 5, wherein the integrating circuit is included：
Second operational amplifier, with normal phase input end, inverting input and outfan, the normal phase input end is coupled to institute
Reference voltage is stated, and the outfan is coupled to the 5th switch；
4th electric capacity, with the first connection end and the second connection end, first connection end is coupled to second computing and puts
The outfan of big device, and second connection end is coupled to the inverting input of second operational amplifier；
5th electric capacity, with the first connection end and the second connection end；
7th switch, for being selectively connected the outfan of second operational amplifier with second operational amplifier
Inverting input；
8th switch, the first connection end for being selectively connected the 5th electric capacity are anti-with second operational amplifier
Phase input；
9th switch, for the first connection end for being selectively connected the 5th electric capacity and the reference voltage；
Tenth switch, for the second connection end for being selectively connected the 5th electric capacity and the reference voltage；And
11st switch, for being selectively connected the second connection end of the 5th electric capacity and first operational amplifier
Outfan.
9. ramp signal generator as claimed in claim 8, wherein in the first period, the integrating circuit is opened described
9th switch and the described 11st switch and close it is described 7th switch, it is described 8th switch and it is described tenth switch come
Discharge and recharge is carried out to the 5th electric capacity according to the preliminary voltage signal.
10. ramp signal generator as claimed in claim 9, wherein in the second period after first period,
The integrating circuit unlatching the described 8th is switched and the described tenth switchs and close the 9th switch and the described tenth
One switchs the 4th electric capacity is carried out discharge and recharge to produce the preliminary ramp signal.
11. ramp signal generators as claimed in claim 8, wherein in the first period, the integrating circuit opens institute
State the 9th switch and the described 11st switch and close it is described 7th switch, it is described 8th switch and the tenth switch
Discharge and recharge is carried out to the 5th electric capacity according to the target voltage signal.
12. ramp signal generators as claimed in claim 11, wherein in the second period after first period,
The integrating circuit unlatching the described 8th is switched and the described tenth switchs and close the 9th switch and the described tenth
One switchs the 4th electric capacity is carried out discharge and recharge to produce the target ramp signal.
13. ramp signal generators as claimed in claim 1, wherein the feedback circuit is included：
Electric capacity, with the first connection end and the second connection end, first connection end is coupled to the bias storage circuit；
First switch, for being selectively connected the second connection end of the electric capacity and the integrating circuit；And
Second switch, for being selectively connected the second connection end and the reference voltage of the electric capacity.
14. ramp signal generators as claimed in claim 1, wherein the integrating circuit is included：
Operational amplifier, with normal phase input end, inverting input and outfan, the normal phase input end is coupled to reference to electricity
Pressure, and the outfan is coupled to the feedback circuit；
First electric capacity, with the first connection end and the second connection end, first connection end is coupled to the operational amplifier
Outfan, and second connection end is coupled to the inverting input of the operational amplifier；
Second electric capacity, with the first connection end and the second connection end；
First switch, for being selectively connected the anti-phase input of the outfan of the operational amplifier and the operational amplifier
End；
Second switch, the first connection end for being selectively connected second electric capacity are anti-phase defeated with the operational amplifier
Enter end；
9th switch, for being selectively connected the first connection end of second electric capacity and the reference voltage；
Tenth switch, for being selectively connected the second connection end of second electric capacity and the reference voltage；And
11st switch, for being selectively connected the second connection end of second electric capacity with the bias storage circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310322753.XA CN104348448B (en) | 2013-07-29 | 2013-07-29 | Ramp signal generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310322753.XA CN104348448B (en) | 2013-07-29 | 2013-07-29 | Ramp signal generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104348448A CN104348448A (en) | 2015-02-11 |
| CN104348448B true CN104348448B (en) | 2017-03-29 |
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ID=52503409
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310322753.XA Active CN104348448B (en) | 2013-07-29 | 2013-07-29 | Ramp signal generator |
Country Status (1)
| Country | Link |
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| CN (1) | CN104348448B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106775143B (en) | 2015-12-31 | 2020-01-03 | 深圳市汇顶科技股份有限公司 | Integrating circuit and capacitance sensing circuit |
| CN117559971B (en) * | 2024-01-09 | 2024-04-26 | 珠海燧景科技有限公司 | Ramp generator, readout circuit and image sensor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4029972A (en) * | 1975-12-16 | 1977-06-14 | Westinghouse Electric Corporation | Ramping circuit |
| CN1074791A (en) * | 1991-12-30 | 1993-07-28 | 汤姆森消费电子有限公司 | Centring circuit |
| CN201365234Y (en) * | 2008-11-17 | 2009-12-16 | 河北实华科技有限公司 | Multifunctional oblique-wave generator |
| CN101674069A (en) * | 2009-10-14 | 2010-03-17 | 美芯晟科技（北京）有限公司 | Slope generating circuit |
-
2013
- 2013-07-29 CN CN201310322753.XA patent/CN104348448B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4029972A (en) * | 1975-12-16 | 1977-06-14 | Westinghouse Electric Corporation | Ramping circuit |
| CN1074791A (en) * | 1991-12-30 | 1993-07-28 | 汤姆森消费电子有限公司 | Centring circuit |
| CN201365234Y (en) * | 2008-11-17 | 2009-12-16 | 河北实华科技有限公司 | Multifunctional oblique-wave generator |
| CN101674069A (en) * | 2009-10-14 | 2010-03-17 | 美芯晟科技（北京）有限公司 | Slope generating circuit |
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| Publication number | Publication date |
|---|---|
| CN104348448A (en) | 2015-02-11 |
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