CN107367926A - A kind of high-precision Pixel-level time-to-amplitude converter of wide dynamic range - Google Patents
A kind of high-precision Pixel-level time-to-amplitude converter of wide dynamic range Download PDFInfo
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- G—PHYSICS
- G04—HOROLOGY
- G04F—TIME-INTERVAL MEASURING
- G04F10/00—Apparatus for measuring unknown time intervals by electric means
- G04F10/005—Time-to-digital converters [TDC]
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Abstract
A kind of high-precision Pixel-level time-to-amplitude converter of wide dynamic range, belongs to Analogous Integrated Electronic Circuits technical field.Include the pel array of ramp signal generation module, triangular signal generation module and multiple picture element modules composition, ramp signal generation module is used to produce ramp signal RAMP and is output to the first input end of picture element module, triangular signal generation module is used to produce triangular signal TRIANGLE and is output to the second input of picture element module, picture element module is used to sample and obtain ramp voltage and triangle wave voltage, the ramp voltage wherein sampled is used for a high position for quantization time, and the triangle wave voltage of sampling is used for the low level of quantization time.The present invention is while accurate time of measuring is realized, the time interval in and can measurement wide dynamic range；And the circuit in picture element module is fairly simple, the area of each picture element module is simultaneously little, is easy to integrate time-to-amplitude converter TAC on a large scale on the same chip.
Description
Technical field
The invention belongs to Analogous Integrated Electronic Circuits technical field, and in particular to a kind of Pixel-level time-to-amplitude converter TAC.
Background technology
Since the mankind find out the world, time interval measurement technology is just arisen at the historic moment, in the civilized history of mankind's more than one thousand years,
People constantly seek and update the new method of time interval measurement.In nowadays people's daily life, clock and watch, mobile phone etc. are just
Prompt instrument has successfully met demand of the most people to time measurement, but in some emerging fields, such as three-dimensional imaging skill
Art, traditional time counting mode far can not meet to require, in order to restore clearly 3-D view as far as possible, no
Only needing the result of time interval measurement has very high precision, and also needs to have wider dynamic range, and this is to traditional
Time interval measurement technology brings great challenge.
Time-to-amplitude converter (Time-to-Amplitude Converter, TAC) is a kind of in integrated circuit fields surveys
The method for measuring time interval.Conventional pixel level time-to-amplitude converter TAC as shown in figure 1, including ramp signal generation module and
Picture element module, its general principle are that a ramp signal is produced outside picture element module, are pushed in picture element module, when in picture element module
Stop signal STOP come interim, sampling hold circuit sampling in picture element module now ramp signal corresponding voltage, Ran Houyong
The size quantization time of sampled voltage every length.The amplitude of oscillation of obvious ramp signal is limited to supply voltage, in this case, when
Between amplitude converter TAC dynamic range and precision be difficult to balance, if wanting to realize high-precision time-to-amplitude converter TAC, that
The time of integration of ramp voltage must be very short, and time-to-amplitude converter TAC dynamic range will be very narrow；If want to realize wide move
The time-to-amplitude converter TAC of state scope, then the time of integration on slope will be very long, time-to-amplitude converter TAC precision
Will be very low.Therefore, for the high-precision application scenario of wide dynamic range, such as 3 Dimension Image Technique, conventional pixel level time
Amplitude converter TAC far can not meet requirement.
The content of the invention
The deficiency for being difficult to balance between dynamic range and precision be present for conventional pixel level time-to-amplitude converter TAC
Part, the present invention propose a kind of new Pixel-level time-to-amplitude converter TAC, high-precision and wide dynamic range same realizing
When but also with low in energy consumption and chip area it is small the advantages of.
The technical scheme is that：
A kind of high-precision Pixel-level time-to-amplitude converter of wide dynamic range, include the pixel of multiple picture element modules composition
Array, ramp signal generation module and triangular signal generation module,
The ramp signal generation module is used to produce ramp signal RAMP and is output to the first defeated of the picture element module
Enter end, the triangular signal generation module is used to produce triangular signal TRIANGLE and is output to the of the picture element module
Two inputs, the picture element module are used to sample and obtain ramp voltage and triangle wave voltage；
The picture element module includes the first source follower, the second source follower, first switch S1, second switch S2, the first electric capacity
C1 and the second electric capacity C2,
First input end of the input of first source follower as the picture element module, the electricity of first switch S1 and first
Hold C1 series connection, its series connection point exports the ramp voltage as the first output end of the picture element module, and first switch S1's is another
The output end of one termination first source follower, the first electric capacity C1 other end ground connection；
Second input of the input of second source follower as the picture element module, the electricity of second switch S2 and second
Hold C2 series connection, its series connection point exports the triangle wave voltage as the second output end of the picture element module, second switch S2's
The output end of another termination second source follower, the second electric capacity C2 other end ground connection.
Specifically, first source follower and the second source follower are n-type source follower,
First source follower includes the first NMOS tube MN1 and the first current source IB1, the grid of the first NMOS tube MN1
Input of the pole as first source follower, its drain electrode connect supply voltage, output of its source electrode as first source follower
Hold and by being grounded after the first current source IB1；
Second source follower includes the second NMOS tube MN2 and the second current source IB2, the grid of the second NMOS tube MN2
Input of the pole as second source follower, its drain electrode connect supply voltage, output of its source electrode as second source follower
Hold and by being grounded after the second current source IB2.
Specifically, the ramp signal generation module include the first operational amplifier A MP1, the second operational amplifier A MP2,
3rd electric capacity C3, the 3rd switch S3, the 4th switch S4 and the 3rd current source IB3,
First operational amplifier A MP1 in-phase input end connection reference voltage VREF, its inverting input are opened by the 3rd
The 3rd current source IB3 negative pole, the 3rd current source IB3 plus earth are connected after the S3 of pass；
The switch S4 parallel connections of 3rd electric capacity C3 and the 4th are attempted by the first operational amplifier A MP1 inverting input and output
Between end；
Second operational amplifier A MP2 in-phase input end connects the first operational amplifier A MP1 output end, its output end
Connect its inverting input and the output end as the ramp signal generation module exports the ramp signal RAMP.
Specifically, the triangular signal generation module includes the 3rd operational amplifier A MP3, four-operational amplifier
AMP4, first comparator COMP1, the second comparator COMP2, the 4th current source IB4, the 5th current source IB5, the 5th switch S5,
6th switch S6, the 4th electric capacity C4, controlling switch and rest-set flip-flop,
4th current source IB4 negative pole connects supply voltage, and its positive pole connects one end of controlling switch；
5th current source IB5 negative pole connects the other end of controlling switch and put by the 3rd computing of connection after the 5th switch S5
Big device AMP3 inverting input, its plus earth；
3rd operational amplifier A MP3 in-phase input end connection reference voltage VREF, its output end connection first comparator
The homophase input of COMP1 inverting input, the second comparator COMP2 in-phase input end and four-operational amplifier AMP4
End；
6th switch S6 and the 4th electric capacity C4 parallel connections are attempted by the 3rd operational amplifier A MP3 inverting input and output
Between end；
First comparator COMP1 in-phase input end connection upper voltage limit VH, the R inputs of its output end connection rest-set flip-flop
End；
Second comparator COMP2 inverting input connection lower voltage limit VL, the S inputs of its output end connection rest-set flip-flop
End；
The control terminal of the Q output connection controlling switch of rest-set flip-flop；
Four-operational amplifier AMP4 output end connects its inverting input and produces mould as the triangular signal
The output end of block exports the triangular signal TRIANGLE.
Specifically, the current value of the 4th current source IB4 is twice of the 5th current source IB5 current value.
Specifically, the magnitude of voltage of the lower voltage limit VL is equal to the magnitude of voltage of the reference voltage V REF.
Specifically, the 3rd switch S3 and the 5th switch S5 are controlled by time initial signal START, the 4th switch
The switches of S4 and the 6th S6 reset signal RESET controls again, the first switch S1 and second switch S2 are by time termination signal
STOP is controlled.
Specifically, first source follower and the second source follower are p-type source follower,
First source follower includes the first PMOS MP1 and the 6th current source IB6, the grid of the first PMOS MP1
Input of the pole as first source follower, its grounded drain, its source electrode as first source follower output end and lead to
Cross the 6th current source IB6 and be followed by supply voltage；
Second source follower includes the second PMOS MP2 and the 7th current source IB7, the grid of the second PMOS MP2
Input of the pole as second source follower, its grounded drain, its source electrode as second source follower output end and lead to
Cross the 7th current source IB7 and be followed by supply voltage.
The present invention operation principle be：
When time initial signal START temporarily, to produce ramp signal RAMP and triangular wave letter respectively outside picture element module
Number TRIANGLE, is then pushed in each picture element module by buffer respectively.It is that two samplings keep electricity in picture element module
Road, when time termination signal STOP comes temporarily, two sampling hold circuits difference termination signal STOP moment in sampling time are corresponding
Ramp signal RAMP and triangular signal TRIANGLE voltage.Ramp voltage and the triangular wave electricity then obtained according to sampling
The size of the magnitude of voltage of pressure judges time interval, wherein the ramp voltage sampled is used for the high position for judging the time, the triangle of sampling
Wave voltage is used for the low level for judging the time, you can realizes the accurate measurement of wide dynamic range time interval.
Beneficial effects of the present invention are：Propose a kind of new wide dynamic range high accuracy Pixel-level time-to-amplitude conversion
Device TAC, while realizing accurate time of measuring, the time interval in and can measurement wide dynamic range；And in picture element module
Circuit is fairly simple, and the area of each picture element module is simultaneously little, is easy to integrate time-amplitude turn on a large scale on the same chip
Parallel operation TAC.
Brief description of the drawings
Fig. 1 is conventional pixel level time-to-amplitude converter TAC structural representation；
Fig. 2 is a kind of high-precision Pixel-level time-to-amplitude converter TAC of wide dynamic range structure provided by the invention
Schematic diagram；
Fig. 3 is ramp generator structural representation in embodiment；
Fig. 4 is the signal sequence control figure of ramp generator in embodiment；
Fig. 5 is the structural representation of embodiment intermediate cam wave producer；
Fig. 6 is the SECO figure of embodiment intermediate cam wave producer；
Fig. 7 is the structural representation of the picture element module using n-type source follower in embodiment；
Fig. 8 is the SECO figure of picture element module in embodiment；
Fig. 9 is the structural representation of the picture element module using p-type source follower in embodiment.
Embodiment
The embodiment of the present invention is described with specific embodiment below in conjunction with the accompanying drawings.
It is illustrated in figure 2 a kind of high-precision Pixel-level time-to-amplitude converter TAC of wide dynamic range provided by the invention
Structural representation, compared with conventional pixel level time-to-amplitude converter TAC, the present invention sampling ramp voltage quantization time
A high position, to judge that the time is in that section, the triangle wave voltage of sampling is used for the low level of quantization time.Due to simply with oblique
Slope voltage judges which section the time is in, and does not need its precise quantification time, so can be with the integration of ramp voltage
Time becomes very long, to realize big dynamic range；The triangle wave voltage of sampling can cause the precision of time quantization to become simultaneously
Must be very high, so just solve conventional pixel level time-to-amplitude converter TAC problems encountered, the present invention is described in detail below
Each module.
Ramp signal generation module in the present embodiment uses ramp generator, and Fig. 3 and Fig. 4 are ramp generator respectively
Structural representation and SECO figure, ramp generator include the first operational amplifier A MP1, the second operational amplifier A MP2, the
Three electric capacity C3, the 3rd switch S3, the 4th switch S4 and the 3rd current source IB3, the first operational amplifier A MP1 in-phase input end
Reference voltage VREF is connected, its inverting input passes through the negative pole of the 3rd current source IB3 of connection after the 3rd switch S3, the 3rd electric current
Source IB3 plus earth；The switch S4 parallel connections of 3rd electric capacity C3 and the 4th are attempted by the first operational amplifier A MP1 anti-phase input
Between end and output end；Second operational amplifier A MP2 in-phase input end connects the first operational amplifier A MP1 output end,
Its output end connects its inverting input and the output end as the ramp signal generation module exports the ramp signal
RAMP。
The general principle of ramp generator is as follows, and when reset signal RESET is effective, the 3rd electric capacity C3 is short-circuited, and first
Operational amplifier A MP1 is connected into the form of unit gain negative-feedback, and now the first operational amplifier A MP1 output end is set to base
Quasi- voltage VREF.
While reset signal RESET is changed into low from height, time initial signal START from low to high, now first
Operational amplifier A MP1 and the 3rd electric capacity C3 forms a first integrator, if the gain of amplifier and bandwidth are sufficiently large, then this
When first integrator output end will produce a preferable slope, its voltage V (t) is with time t variation relation：
Wherein I1 is the 3rd current source IB3 current value, when time initial signal START is low by height displacement, now not
There is electric current to flow through the 3rd electric capacity C3 again, first integrator output end voltage will keep constant, if time initial signal START is height
Level time length is T, i.e. the effective time of first integrator charging is T, then the electricity after first integrator output end is stable
Press and be：
Because the driving force of ramp generator is not strong enough, very big capacitive load can not be driven, it is therefore desirable to the second fortune
Calculate amplifier AMP2 and make buffer, match the load of front stage.Second operational amplifier A MP2 is connected into unit gain negative-feedback
Form, output end voltage follows input terminal voltage to change and change, if the second operational amplifier A MP2 gain and bandwidth are enough
It is high, then output end voltage can be completely the same with input terminal voltage, therefore, the second operational amplifier A MP2 can intactly by
Slope is pushed in picture element module caused by front stage circuits.
The present embodiment intermediate cam ripple signal generator module uses triangular-wave generator, and Fig. 5 and Fig. 6 are triangular wave respectively
The structural representation and SECO figure of device, triangular-wave generator include the 3rd operational amplifier A MP3, four-operational amplifier
AMP4, first comparator COMP1, the second comparator COMP2, the 4th current source IB4, the 5th current source IB5, the 5th switch S5,
6th switch S6, the 4th electric capacity C4, controlling switch and rest-set flip-flop, the 4th current source IB4 negative pole connect supply voltage, its positive pole
Connect one end of controlling switch；5th current source IB5 negative pole connects the other end of controlling switch and by being connected after the 5th switch S5
3rd operational amplifier A MP3 inverting input, its plus earth；3rd operational amplifier A MP3 in-phase input end connection
Reference voltage V REF, its output end connection first comparator COMP1 inverting input, the second comparator COMP2 it is same mutually defeated
Enter end and four-operational amplifier AMP4 in-phase input end；6th switch S6 and the 4th electric capacity C4 parallel connections are attempted by the 3rd computing
Between amplifier AMP3 inverting input and output end；First comparator COMP1 in-phase input end connection upper voltage limit VH,
Its output end connects the R input of rest-set flip-flop；Second comparator COMP2 inverting input connection lower voltage limit VL, its is defeated
Go out the S inputs of end connection rest-set flip-flop；The control terminal of the Q output connection controlling switch of rest-set flip-flop；4th operation amplifier
Device AMP4 output end connects its inverting input and the output end as the triangular signal generation module exports described three
Angle ripple signal TRIANGLE.Wherein the 4th current source IB4 current value is twice of the 5th current source IB5 current value so that
Triangular wave charging interval and discharge time are equal.
The general principle of triangular signal generator is as follows, while reset signal RESET is effective, time initial signal
START is low level, now similar with the principle on slope, and the 3rd operational amplifier A MP3 is connected into the shape of current potential gain negative feedback
Formula, its output end voltage are set to reference voltage V REF.
Similar with slope, the 3rd operational amplifier A MP3 and the 4th electric capacity C4 form a second integral device, reset signal
RESET and time initial signal START are inverted simultaneously, now because the Q outputs of rest-set flip-flop are low level, then now the 4th
Current source IB4 electric current 2I does not flow through second integral device, and only the 5th current source IB5 electric current I extracts electric current, second integral
Device output end will produce upward oblique wave, i.e., now second integral device output voltage is
Wherein, I2 is the 5th current source IB5 current value, when output end voltage reaches upper voltage limit VH, now first
Comparator COMP1 output ends will be inverted to the R=0 of low level, i.e. rest-set flip-flop from high level, due to the second comparator COMP2
Output end voltage maintain high level constant, i.e. the S=1 of rest-set flip-flop, then the Q output of rest-set flip-flop will be reversed to high electricity
Flat, i.e. Q=1, now, the 4th current source IB4 electric current also begin to flow through second integral device, and two strands of electric currents flow through the second product simultaneously
Divide device, because the 4th current source IB4 electric current is twice of the 5th current source IB5 electric currents, therefore equivalent total current is downward
Pour into, size is I electric current, and now second integral device output voltage constantly declines, and produces downward oblique wave, then has
When second integral device output voltage is again below upper voltage limit VH, first comparator COMP1 output end voltages are by low
Level upset is R=1, the S=1 of high level, now rest-set flip-flop, and rest-set flip-flop is in hold mode, and Q output remains height
Level is constant, and because the transfer process time is very short, the upset of first comparator COMP1 output voltages shows as burst pulse letter
Number.
When second integral device output end voltage drops to lower voltage limit VL, the second comparator COMP2 output ends are turned to
The S=0 of low level, i.e. rest-set flip-flop, because first comparator COMP1 output end voltage maintenance high level is constant, i.e., RS is touched
Send out the R=1 of device, then rest-set flip-flop Q output is low level, i.e. Q=0, now, the 4th current source IB4 electric current by overturning
2I is turned off, and is no longer flow through second integral device, and now only the 5th current source IB5 electric current I extracts electric current, the output of second integral device
End will produce upward oblique wave, i.e. now second integral device output voltage
Similar, triangular wave output voltage can be higher than lower voltage limit VL again, the second comparator COMP2 output end voltages by
Low level upset is R=1, the S=1 of high level, now rest-set flip-flop, and rest-set flip-flop is in hold mode, and Q output remains
Low level is constant, and because the transfer process time is very short, the upset of the second comparator COMP2 output voltages also shows as a burst pulse
Signal.
3rd operational amplifier A MP3 bias voltage VREF and the second comparator COMP2 bias voltage level lower voltage limit
VL is same value, i.e.,
VREF=VL (6)
The process that an integration rises so now just is repeated, so repeats down, just generates triangular wave.
When the time, initial signal START was changed into low from height, there is no electric current to flow through the 4th electric capacity C4, and second integral device is defeated
Go out end to be maintained a certain voltage and keep constant.
Four-operational amplifier AMP4 effect is similar with ramp generator, matches the load of front stage, by caused by
Triangular wave is pushed in each pixel.
Fig. 7 is to include the first NMOS tube MN1 using the circuit structure diagram of the picture element module of n-type source follower, the first source follower
With the input of the first current source IB1, the first NMOS tube MN1 grid as first source follower, its drain electrode connects electricity
Source voltage, its source electrode as first source follower output end and by being grounded after the first current source IB1；Second source with
Device includes the second NMOS tube MN2 and the second current source IB2, and the grid of the second NMOS tube MN2 is as second source follower
Input, its drain electrode connects supply voltage, its source electrode as second source follower output end and pass through the second current source IB2
After be grounded.
Fig. 9 is to include the first PMOS MP1 using the circuit structure diagram of the picture element module of p-type source follower, the first source follower
Make with the 6th current source IB6, the input of the first PMOS MP1 grid as the first source follower, its grounded drain, its source electrode
Output end for the first source follower is simultaneously followed by supply voltage by the 6th current source IB6；Second source follower includes the second PMOS
Input of MP2 and the 7th current source IB7, the second PMOS MP2 grid as the second source follower, its grounded drain, its source
Pole as the second source follower output end and supply voltage is followed by by the 7th current source IB7.
SECO figure in Fig. 8 picture element modules, to preceding when the effect of source follower is the switch switching for isolating late-class circuit
The influence of level circuit, switch and electric capacity form a simple sampling hold circuit, when time termination signal STOP is high level,
Voltage constantly follows the voltage of oblique wave and triangular wave on electric capacity, when time termination signal STOP be switched to by high level it is low level
Moment, the voltage on electric capacity no longer change with the voltage corresponding to ramp signal RAMP and triangular signal TRIANGLE,
That is TRIANGLE pairs of sampling hold circuit sampling time termination signal STOP switching instant ramp signal RAMP and triangular signal
The voltage answered, the voltage on sampling capacitance is quantified respectively, time initial signal START and time termination signal can be obtained
STOP time interval, the result of such time quantization not only have very high precision, while but also with very wide dynamic range.
Circuit in picture element module is simply made up of source follower and simple sampling hold circuit, so each picture element module only need compared with
Low power consumption and chip area can be realized.
The present invention does not realize wide dynamic range for traditional split-second precision amplitude converter TAC, and wide dynamic model
The time-to-amplitude converter TAC enclosed does not realize high accuracy, it is proposed that a high position for a kind of ramp voltage quantization time with sampling,
With the high-precision time-to-amplitude converter TAC of the wide dynamic range of the low level of the triangle wave voltage quantization time of sampling, so just
Realizing that time measurement is high-precision simultaneously, big dynamic range can be realized again, simultaneously as the circuit ratio in picture element module
Relatively simple, the area of each picture element module is simultaneously little, is easy to integrate TAC on a large scale on the same chip, can so realize
Wide dynamic range high accuracy Pixel-level TAC.
One of ordinary skill in the art will be appreciated that embodiment described here is to aid in reader and understands this hair
Bright principle, it should be understood that protection scope of the present invention is not limited to such especially statement and embodiment.This area
Those of ordinary skill can make according to these technical inspirations disclosed by the invention various does not depart from the other each of essence of the invention
The specific deformation of kind and combination, these deform and combined still within the scope of the present invention.
Claims (8)
1. a kind of high-precision Pixel-level time-to-amplitude converter of wide dynamic range, it is characterised in that including multiple picture element modules
Pel array, ramp signal generation module and the triangular signal generation module of composition,
The ramp signal generation module is used to produce ramp signal (RAMP) and is output to the first input of the picture element module
End, the triangular signal generation module are used to produce triangular signal (TRIANGLE) and are output to the of the picture element module
Two inputs, the picture element module are used to sample and obtain ramp voltage and triangle wave voltage；
The picture element module includes the first source follower, the second source follower, first switch (S1), second switch (S2), the first electric capacity
(C1) and the second electric capacity (C2),
First input end of the input of first source follower as the picture element module, first switch (S1) and the first electric capacity
(C1) connect, its series connection point exports the ramp voltage as the first output end of the picture element module, first switch (S1)
The output end of another termination first source follower, the other end ground connection of the first electric capacity (C1)；
Second input of the input of second source follower as the picture element module, second switch (S2) and the second electric capacity
(C2) connect, its series connection point exports the triangle wave voltage, second switch (S2) as the second output end of the picture element module
Another termination second source follower output end, the second electric capacity (C2) the other end ground connection.
2. the high-precision Pixel-level time-to-amplitude converter of wide dynamic range according to claim 1, it is characterised in that institute
It is n-type source follower to state the first source follower and the second source follower,
First source follower includes the first NMOS tube (MN1) and the first current source (IB1), first NMOS tube (MN1)
Input of the grid as first source follower, its drain electrode connect supply voltage, and its source electrode is defeated as first source follower
Go out to hold and be grounded afterwards by the first current source (IB1)；
Second source follower includes the second NMOS tube (MN2) and the second current source (IB2), second NMOS tube (MN2)
Input of the grid as second source follower, its drain electrode connect supply voltage, and its source electrode is defeated as second source follower
Go out to hold and be grounded afterwards by the second current source (IB2).
3. the high-precision Pixel-level time-to-amplitude converter of wide dynamic range according to claim 1, it is characterised in that institute
State ramp signal generation module include the first operational amplifier (AMP1), the second operational amplifier (AMP2), the 3rd electric capacity (C3),
3rd switch (S3), the 4th switch (S4) and the 3rd current source (IB3),
The in-phase input end connection reference voltage (VREF) of first operational amplifier (AMP1), its inverting input are opened by the 3rd
Close the negative pole that (S3) connects the 3rd current source (IB3) afterwards, the plus earth of the 3rd current source (IB3)；
3rd electric capacity (C3) and the 4th switch (S4) parallel connection are attempted by the inverting input of the first operational amplifier (AMP1) and defeated
Go out between end；
The in-phase input end of second operational amplifier (AMP2) connects the output end of the first operational amplifier (AMP1), its output end
Connect its inverting input and the output end as the ramp signal generation module exports the ramp signal (RAMP).
4. the high-precision Pixel-level time-to-amplitude converter of wide dynamic range according to claim 1, it is characterised in that institute
Stating triangular signal generation module includes the 3rd operational amplifier (AMP3), four-operational amplifier (AMP4), first comparator
(COMP1), the second comparator (COMP2), the 4th current source (IB4), the 5th current source (IB5), the 5th switch (S5), the 6th open
(S6), the 4th electric capacity (C4), controlling switch and rest-set flip-flop are closed,
The negative pole of 4th current source (IB4) connects supply voltage, and its positive pole connects one end of controlling switch；
The negative pole of 5th current source (IB5) connects the other end of controlling switch and connects the 3rd computing afterwards by the 5th switch (S5) and puts
The inverting input of big device (AMP3), its plus earth；
The in-phase input end connection reference voltage (VREF) of 3rd operational amplifier (AMP3), its output end connection first comparator
(COMP1) inverting input, the in-phase input end of the second comparator (COMP2) and the same phase of four-operational amplifier (AMP4)
Input；
6th switch (S6) and the 4th electric capacity (C4) parallel connection are attempted by the inverting input of the 3rd operational amplifier (AMP3) and defeated
Go out between end；
The in-phase input end connection upper voltage limit (VH) of first comparator (COMP1), the R inputs of its output end connection rest-set flip-flop
End；
The inverting input connection lower voltage limit (VL) of second comparator (COMP2), the S inputs of its output end connection rest-set flip-flop
End；
The control terminal of the Q output connection controlling switch of rest-set flip-flop；
The output end of four-operational amplifier (AMP4) connects its inverting input and is used as the triangular signal generation module
Output end export the triangular signal (TRIANGLE).
5. the high-precision Pixel-level time-to-amplitude converter of wide dynamic range according to claim 4, it is characterised in that institute
The current value for stating the 4th current source (IB4) is twice of the current value of the 5th current source (IB5).
6. the high-precision Pixel-level time-to-amplitude converter of wide dynamic range according to claim 5, it is characterised in that institute
The magnitude of voltage for stating lower voltage limit (VL) is equal to the magnitude of voltage of the reference voltage (VREF).
7. the high-precision Pixel-level time-to-amplitude converter of wide dynamic range according to claim 3 or 4, its feature exist
In, it is described 3rd switch (S3) and the 5th switch (S5) by time initial signal (START) control, it is described 4th switch (S4) and
6th switch (S6) and reset signal (RESET) control, the first switch (S1) and second switch (S2) are terminated by the time and believed
Number (STOP) control.
8. the high-precision Pixel-level time-to-amplitude converter of wide dynamic range according to claim 1, it is characterised in that institute
It is p-type source follower to state the first source follower and the second source follower,
First source follower includes the first PMOS (MP1) and the 6th current source (IB6), first PMOS (MP1)
Input of the grid as first source follower, its grounded drain, its source electrode as first source follower output end simultaneously
Supply voltage is followed by by the 6th current source (IB6)；
Second source follower includes the second PMOS (MP2) and the 7th current source (IB7), second PMOS (MP2)
Input of the grid as second source follower, its grounded drain, its source electrode as second source follower output end simultaneously
Supply voltage is followed by by the 7th current source (IB7).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110568749A (en) * | 2019-08-30 | 2019-12-13 | 华中师范大学 | time-to-digital converter circuit, time-to-digital converter device, time-to-digital converter apparatus, and method of controlling time-to-digital converter device |
| CN112261327A (en) * | 2020-11-13 | 2021-01-22 | 中国科学院高能物理研究所 | Pixel detector and distributed front-end analog-digital conversion and reading circuit and method thereof |
| CN113485506A (en) * | 2021-07-06 | 2021-10-08 | 一念传感科技(深圳)有限公司 | Voltage current generator, generating method and generator application system |
-
2017
- 2017-08-28 CN CN201710750704.4A patent/CN107367926B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110568749A (en) * | 2019-08-30 | 2019-12-13 | 华中师范大学 | time-to-digital converter circuit, time-to-digital converter device, time-to-digital converter apparatus, and method of controlling time-to-digital converter device |
| CN112261327A (en) * | 2020-11-13 | 2021-01-22 | 中国科学院高能物理研究所 | Pixel detector and distributed front-end analog-digital conversion and reading circuit and method thereof |
| CN113485506A (en) * | 2021-07-06 | 2021-10-08 | 一念传感科技(深圳)有限公司 | Voltage current generator, generating method and generator application system |
| CN113485506B (en) * | 2021-07-06 | 2022-05-17 | 一念传感科技(深圳)有限公司 | Voltage current generator, generating method and generator application system |
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