CN207690103U - A kind of charge type sensor and the sensor array with it - Google Patents
A kind of charge type sensor and the sensor array with it Download PDFInfo
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- CN207690103U CN207690103U CN201721283679.5U CN201721283679U CN207690103U CN 207690103 U CN207690103 U CN 207690103U CN 201721283679 U CN201721283679 U CN 201721283679U CN 207690103 U CN207690103 U CN 207690103U
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Abstract
The utility model is related to a kind of charge type sensor and with its sensor array, including：Charge generation circuit, for exporting and the relevant quantity of electric charge of the size of sensor target physical quantity；Integrating circuit, input terminal are connect with the output end of charge generation circuit, for accumulating the quantity of electric charge, and output voltage signal；Charge adjustment circuit injects positive charge or negative electrical charge to integrating circuit.The polarity and rate that charge is injected by the way that charge adjustment circuit is arranged can play the role of adjusting integrating circuit charge accumulation rate, compensate integrating circuit mismatch.
Description
Technical field
The utility model belongs to sensor field, more particularly to a kind of charge type sensor with integrating circuit.
Background technology
In integrating circuit handles signal process, non-signal amount can cause integrator integrating rate too fast, further result in
Integrator processing signal integration device is easy to happen full, causes the magnifying power of signal inadequate；Simultaneously because the difference of integrator itself
Property, signal processing circuit may will produce mismatch phenomenon.
By taking capacitive fingerprint sensor as an example, fingerprint sensor is to weigh fingerprint sensor to the penetration capacity of surface dielectric
One of leading indicator of performance.In particular, as fingerprint sensor is widely used in smart mobile phone field, for the intelligent hand of cooperation
The industrial design of machine, to the penetration capacity of fingerprint sensor, more stringent requirements are proposed.Smart mobile phone is under front screen at present
The requirement for setting fingerprint sensor is to penetrate the chemically reinforced glass of 1mm-2mm, to ensure the structural strength of screen, under conversion
Come, fingerprint sensor needs the capacitive resolution for reaching 10^-19f.And fingerprint sensor will reach 1mm chemically reinforced glass
Penetration power needs the compensation for the DC component (non-signal amount) for handling fingerprint well, under this scale DC component with exchange point
The ratio of amount extracts fingerprint image the AC compounent of significant only fingerprint 1000 or more.It is straight in integral process
Flow component makes the integration rate of integrator too fast, and integrator saturation influences picture quality.
Influence of the DC component to integrating circuit charge cumulative amount is adjusted, is handed over as long as the dynamic range of reading circuit is made to cover
The range of flow component can simplify the design of reading circuit, improve the performance of reading circuit.
Therefore it needs to propose a kind of integration rate of new circuit and method adjustment integrating circuit, reduces DC component to referring to
The influence of print image.
Utility model content
In order to solve the above-mentioned technical problem, the utility model discloses a kind of charge type sensor, including：Charge generates electricity
Road, output size with the relevant quantity of electric charge measured by sensing；The output end of integrating circuit, input terminal and charge generation circuit connects
It connects；Integrating circuit is for accumulating the quantity of electric charge, and the relevant electric signal of the quantity of electric charge for exporting and having accumulated；Adjustment circuit, it is defeated
The input terminal of outlet and integrating circuit connects；Adjustment circuit is used to inject charge to integrating circuit to adjust integrating circuit accumulation electricity
The rate of lotus.
The utility model setting adjustment circuit is connect with charge generation circuit and integrating circuit respectively, and adjustment circuit is in charge
It is connected between generation circuit and integrating circuit, adjusts the charge cumulative amount of integrating circuit, the dynamic range of circuit is made only to need to cover
Lid AC compounent and a small amount of DC component.
Charge generation circuit, including non-electrical signal sample circuit and charge transfer switch.Sample circuit is used for non-telecom
Number amount is converted into charge signal amount, and the quantity of electric charge that charge generation circuit generates is related to non-electrical signal.The non-electrical signal amount can be with
It is physical signal amount, can also be chemical signal amount.Such as in fingerprint sensor, the distance measurements of finger crestal line and strand lines
For can be converted to by charge generation circuit with apart from the relevant quantity of electric charge.The charge generation circuit by charge transfer switch with
Integrating circuit connects, and adjustment circuit is logical to be connect with integrating circuit and charge generation circuit, and in integrating circuit integral process to
Integrating circuit injects positive charge or negative electrical charge to adjust integrating rate, prevents integrating circuit integration rate too fast and is saturated.
The charge generation circuit described in a kind of embodiment of the utility model be capacitance sensing circuit, the quantity of electric charge of generation with
The size of sensing capacitance is related.More specifically, the sample circuit in charge generation circuit includes capacitance, charge generation circuit
The quantity of electric charge of generation is related to capacitance size, charge generation circuit have sensing electrode and driving electrodes, sensing electrode be used for and
Target surface to be sensed forms sampling capacitance.The texture on the size of sampling capacitance and fingerprint surface is in function in fingerprint sensor
Relationship is the distance between finger surface texture and sensing electrode according to capacitance equation C=ε S/4 π kd wherein d, works as sensing electrode
The sampling capacitance of the smaller formation of distance d is larger when forming sampling capacitance with the crestal line on fingerprint surface, when sensing electrode and fingerprint table
The sampling capacitance of the larger formation of distance d is small when the valley line in face forms sampling capacitance.Driving electrodes are used for and sensing electrode is formed and driven
Dynamic condenser, sensing electrode are connect by reset switch with reference voltage, driving electrodes and target to be detected respectively with the first level
Driver is connected with second electrical level driver, and driving electrodes in sampling capacitance for so that form and fingerprint texture surface distance d
The relevant quantity of electric charge；The sensing electrode of the crestal line of fingerprint and capacitor sampling circuit is apart from small in capacitive fingerprint sensor, and paddy
The sensing electrode of line and capacitor sampling circuit distance is big, to valley line partition capacitance more, the crestal line part that samples the quantity of electric charge to be formed
It is few that capacitance samples the quantity of electric charge to be formed.Integrating circuit so that the capacitor sampling circuit crestal line and the corresponding quantity of electric charge shape of strand
At measurable voltage signal.The output end of the capacitor sampling circuit connects the input of integrating circuit by charge transfer switch
End connection, integrating circuit is for accumulating the quantity of electric charge and exporting voltage signal corresponding with fingerprint distance measurements；It is repeated several times
It charges to the integrating capacitor in integrator.Before repeating to integrate, in order to ensure that it is pre- that the consistency measured is needed before integral
First integrator is resetted, i.e. so that integrating capacitor has, there are one initial electricity for the process of reset, it is assumed for example that in integrating capacitor
It is Qrst=(Vref2-Vref1) * Cr that electricity is put after the reference voltage Vref 1 at both ends, the reset of Vref2 integrating capacitors Cr, is
The structure of simplified reset circuit can be directly connected to the both ends of integrating capacitor with reset switch, that is, the electricity of integrating capacitor Cr after resetting
Measure Qrst=0.And when charging every time to integrating capacitor, adjustment circuit samples by adjusting switch and the integrating circuit and capacitance
Circuit connects, and injects positive charge or negative electrical charge charge to the integrating circuit to adjust integration rate.
Adjustment circuit includes adjustment capacitance, level driver and reset switch in the utility model some embodiments, is adjusted
Whole capacitance is connect with level driver, and adjustment capacitance is connect by the second reset switch with reference voltage.Adjustment circuit has two
Kind working condition, adjustment state make the adjustment capacitance that the integrating circuit be connected so that the storage charge in adjustment capacitance
Inject integrating circuit.Secondly reset state, makes the adjustment capacitance lead and the reference voltage is connected so that adjustment capacitance has
The initial quantity of electric charge.The initial quantity of electricity of adjustment circuit is determined by adjustment capacitance, the driving voltage of level driver and reference voltage
It is fixed；Level driver can also be replaced with fixed reference voltage, as long as the compensation quantity of electric charge can meet design requirement.
The process of integrating circuit recharge is：
S1 resets product circuit；
S2 disconnects charge transfer switch, disconnects adjustment switch；
S3 is closed charge generation circuit reset switch, is closed adjustment circuit reset switch；
It is height that S4 charge generation circuit level drivers, which control signal, and it is height that adjustment circuit level driver, which controls signal,；
S5 disconnects charge generation circuit reset switch, disconnects adjustment circuit reset switch；
S6 is closed charge transfer switch, is closed adjustment switch；
It is low that S7 charge generation circuit level drivers, which control signal, and it is low that adjustment circuit level driver, which controls signal,；
S8 returns to step S2
Above-mentioned integral process is analyzed：It is Cf to enable the capacitance of sampling capacitance, and it is Cd to drive the capacitance of capacitance, parasitic electricity
The capacitance of appearance is Cb.The value for connecting the bus parasitic capacitance of capacitor sampling circuit and integrating circuit is Cp, and adjustment capacitance is Cc.
The value of reference voltage for reset drives electrode is Vint, and the value of comparison circuit reference voltage is VREF3.Adjustment circuit refers to
Voltage is VREF5, and charge generation circuit the first level driver high level is that V12 low levels are V11, charge generation circuit
Two level driver high level are that V22 low levels are V21, and it is V31 that the flat driver high level of adjustment circuit, which is V32 low levels,.It is fixed
Adopted Δ V1=V12-V11, Δ V2=V22-V21, Δ V3=V32-V31, Δ VREF=VREF1-Vint.
According to charge balance concept and integrator operation principle, the charge Δ Q that integrating capacitor charges every time can be obtained：
Δ Q=(Δ VREF- Δ V1) * Cf+ (Δ VREF- Δ V2) * Cd+ Δ VREF*Cb+ (Δ V3+VREF1-VREF5) * Cc.
As can be seen that adjustment circuit makes charge transfer quantity produce a compensation quantity of electric charge (Δ V3+ from above equation
VREF1-VREF5)*Cc.It, can be with when containing larger DC component in Cf and affecting the extraction of fingerprint AC compounent
By reasonably configuring the value of Δ V3, VREF5 and Cc, the quantity of electric charge that DC component in Cf is brought is neutralized.Due in Cf
DC component is a variable quantity, and acquisition is all likely to be encountered different Cf to fingerprint sensor every time, also has different direct currents certainly
Component, so the compensation quantity of electric charge is just needed to make and can be adjusted in real time, i.e., third level driver is adjustable level driver makes
Δ V3 is adjustable or compensating electric capacity Cc is tunable capacitor, injected with forming the different quantities of electric charge for different sampling capacitances
The integrating capacitor；It can be seen that the charge adjustment amount of adjustment circuit is also to be repeatedly injected integral electricity several times from the process of integral
Lu Zhong, i.e., to the compensation of integrating circuit in time when it is discrete.
In some embodiments in the present invention, the first input end of comparison circuit and the output end of integrating circuit
Second input terminal of connection, comparison circuit connects reference voltage.
During sampling capacitance is to integrating capacitor recharge, the output of integrator will produce unidirectional variation.Integral
The output of device terminates to comparison circuit, when the output voltage of integrator and the reference voltage of comparison circuit intersect, comparison circuit
The voltage signal of output can be overturn, and the time T of overturning is exactly the output of fingerprint sensor.The value of comparison reference voltage is enabled to be
VREF3, then at the time of comparison circuit output switching activity integrating capacitor quantity of electric charge Qr.end=(VREF3-VREF1) * Cr.
The flip-flop transition of comparison circuit is T=(Qr.end-Qr.rst)/Δ Q, in some embodiments at the beginning of integrating circuit
Beginningization integrating capacitor Qr.rst=0 designs given fingerprint sensor, and Qr.end is definite value and is Cf according to formula Δ Q
Linear function, in engineering, T roundings export as a result for simplicity in practice.
The charge generation circuit described in a kind of embodiment of the utility model be photoelectric sensing circuit, the quantity of electric charge of generation with
The size of the light energy of reception is related, and charge generation circuit has optical sensor for receiving target finger reflected light, and
Generate the charge inducing containing finger print information ingredient.It is anti-since the ridge of target finger and paddy are different at a distance from contact surface
The intensity for penetrating light is also different, cause optical sensor generate charge with the variation of light respective change.
The charge generation circuit described in a kind of embodiment of the utility model be pressure sensor circuit, the quantity of electric charge of generation with
The size for the pressure being subject to is related.Piezoelectric element can be used to generate charge, piezoelectric element is for detecting ultrasonic pressure.Charge
The quantity of electric charge that generation circuit generates is directlyed proportional to piezoelectric element to the pressure that piezoelectric element is subject to.Usual piezoelectric element receives finger
Reflected ultrasonic wave, piezoelectric element export the charge of frenulum finger print information, and the corresponding piezoelectric element section of crestal line generates
The quantity of electric charge is more than the quantity of electric charge that the corresponding piezoelectric element of valley line generates.
Similarly, the output end of piezoelectricity or electric charge generation circuit by charge transfer switch with connect integrating circuit
Input terminal connects, for accumulating the quantity of electric charge and exporting and the relevant voltage signal of the quantity of electric charge.It is consistent in order to ensure to measure
Property need in advance to reset integrator before integral, the process of reset i.e. so that integrating capacitor tool there are one initial electricity.Example
As assumed, electricity is Qrst=after the reference voltage Vref 2 at integrating capacitor both ends, the reset of Vref1 integrating capacitors Cr
(Vref2-Vref1) * Cr, the structure in order to simplify reset circuit can be directly connected to the both ends of integrating capacitor with reset switch, i.e.,
The electricity Qrst=0 of integrating capacitor Cr after reset.
In a kind of embodiment of the utility model, adjustment circuit is produced by adjusting switch and the integrating circuit and charge
Raw circuit connection, adjustment circuit adjust integrating circuit electric quantity accumulation.Adjustment circuit includes that current source and adjustment switch, the electric current
Source provides the positive charge or negative electrical charge charge for injecting integrating circuit.There are two types of working condition, one adjustment for adjustment circuit tool
State makes the current source that the integrating circuit be connected so that positive charge or negative electrical charge charge injection integral electricity in current source
Road；Secondly reset state, disconnects adjustment switch and carries out reset setting to the parameter of adjustment circuit.In use current source 43 to product
When the quantity of electric charge of parallel circuit accumulation is adjusted, the quantity of electric charge that the adjustment circuit is injected to integrating circuit is continuous in time
It is not intermittent.The output end of charge generation circuit is connected to the input terminal of integrating circuit by charge transfer switch, integral
The output end of circuit is connected to the input terminal of comparison circuit, when the value of the reference voltage changes to the reference voltage in comparison circuit
Value when, comparison circuit overturns output signal, the signal overturning time T=(Qr.end-Qr.rst)/(IL-In), ILDepending on
For in certain period of time by mean charge, I be considered as within a certain period of time by adjusting circuit to integral integrating capacitor compensation
Mean charge amount.Given fingerprint sensor is designed, (Qr.end-Qr.rst) is definite value, (IL-In) it is the one of Cf
Secondary function, in engineering, T roundings export as a result for simplicity in practice, and T is as output.
The utility model also provides a kind of obtaining based on adjustment circuit acquisition charge integrating circuit mismatch adjusting parameter
Take method, including step：
S1：It is that acquiescence inputs that charge generation circuit, which is arranged,；
The acquiescence input refers to that charge generation circuit does not have any external input or only includes that background inputs.Such as referring to
It is that acquiescence inputs, but is wrapped in signal of acquiescence input at this that fingerprint sensor when finger is not provided in line sensor, on sensor
Background signal containing fingerprint sensor itself； S2：When m- voltage coordinate plane on setting target point (T0, V0)；
The target point (T0, V0) is in order to which verificating sensor configures parameter and is arranged, when the output characteristics of sensor is bent
Line can pass through or very close to target point (T0, V0), then it is assumed that sensor configuration parameter can reach design object.
S3：To the different configuration parameters of adjustment circuit setting, the corresponding charge integration electricity of each configuration parameter is obtained
Road when m- voltage coordinate plane on output characteristic curve；
S4：It chooses and the target point (T0, V0) immediate output characteristic curve；
S5：It obtains adjustment circuit corresponding with the immediate output characteristic curve of the target point and configures parameter.
Preferably, include step for arbitrary adjustment circuit configuration parameter Ki in the step S3：
S31：Initialize integrating circuit；
S32：Set adjustment circuit configuration parameter to Ki；
S33：Charge integrating circuit described in continuous service；
S34：Describe the charge integrating circuit when m- voltage coordinate plane on output characteristic curve.
Preferably, integrating circuit output characteristic curve when different configuration parameters, to pass through a plurality of straight of same initial point
Line.
The advantage of the utility model compared with the prior art is, positive charge or negative electrical charge is injected to integrating circuit, with adjustment
The integration rate of integrating circuit.The polarity and rate that charge is injected by the way that charge adjustment circuit is arranged, can play adjustment charge
Integration rate compensates integrating circuit mismatch.
Description of the drawings
Fig. 1 a and Fig. 1 b are charge sensor circuit schematic diagrames.
Fig. 2 a and Fig. 2 b are that charge sensor circuit schematic diagram wherein charge generation circuit includes sampling capacitance and driving
Capacitance.
Fig. 3 a to Fig. 3 c are that charge sensor circuit schematic diagram wherein charge generation circuit includes optical sensor.
Fig. 4 a to Fig. 4 c are that charge sensor circuit schematic diagram wherein charge generation circuit includes piezoelectric element.
Fig. 5 a to Fig. 5 c are adjustment circuit schematic diagrames.
Fig. 6 a to Fig. 6 c are integrating circuit schematic diagrames.
Fig. 7 a and Fig. 7 b are that charge generation circuit includes that sampling capacitance integrates adjustment circuit schematic diagram.
Fig. 8 a and Fig. 8 b are that charge generation circuit includes that optical sensor integrates adjustment circuit schematic diagram.
Fig. 9 a and Fig. 9 b are that charge generation circuit includes that piezoelectric element integrates adjustment circuit schematic diagram.
Figure 10 is to obtain integrating circuit mismatch parameter adjustment configuration method the output of process characteristic curve schematic diagram.
Specific implementation mode
Technical solutions of the utility model and technical principle are explained below in conjunction with attached drawing, the utility model provides a kind of
Charge integration adjustment circuit and fingerprint sensor and fingerprint detection method with it, the utility model is by taking fingerprint sensor as an example
The operation principle for explaining integral adjustment circuit, but does not limit scope of protection of the utility model, and scope of protection of the utility model should be with
Subject to the contents of claims.
Fig. 1 a are please referred to, the circuit in Fig. 1 includes charge generation circuit 10, integrating circuit 20 and adjustment circuit 40.Charge
X to Q in generation circuit 10, X represent non-electrical signal amount, such as physical signal amount, chemical signal amount etc., but this signal is usual
Including being not intended to the non-effective semaphore into circuit, such as noise signal etc.；Q represents charge signal amount, charge generation circuit
10 inside include non-electrical signal measuring circuit, such as capacitor sampling circuit, light sensation circuit/pressure sensitivity circuit, and effect is by non-electrical
Semaphore changes into the associated quantity of electric charge.
The output end of adjustment circuit 40 connects with the input terminal of the output end of charge generation circuit 10 and integrating circuit 20 respectively
It connects.Adjustment circuit 40 is used to adjust the charge accumulation amount of integrating circuit 20, the non-effective semaphore that adjustment integrating circuit 40 neutralizes；
Adjusting the integration rate of the integral of integrating circuit prevents integrating circuit to be saturated, and improves signal magnifying power, compensates integrating circuit mismatch.
Please referring to Fig. 1 b can integrate on the basis of above-mentioned charge generation circuit 10, adjustment circuit 40, integrating circuit 20
The output end connection comparator 30 of circuit, in order to calculating the time of integration of integrating circuit.
Such as according to charge generation circuit shown in Fig. 2 a and 2b, for the distance measurements of fingerprint surface texture to be converted
At the quantity of electric charge.The quantity of electric charge that charge generation circuit 10 generates is in be inversely proportional with fingerprint surface distance.Finger crestal line and strand lines
Distance measurements be can charge signal amount be converted to by charge generation circuit 10.Integrating circuit 20 passes through electricity with charge generation circuit 10
Lotus transfer switch 11 connects.Adjustment circuit 40 connect by adjusting switch 41 with integrating circuit and charge generation circuit 10, and
Charge is injected to adjust integrating rate to integrating circuit 20 in integrating circuit integral process, prevents integrating circuit integrating rate too fast
And it is saturated.
Charge generation circuit includes sampling capacitance 13, the quantity of electric charge and capacitance that charge generation circuit generates in Fig. 2 a and 2b
It is big proportional.There are charge generation circuit sensing electrode and driving electrodes, target to be detected such as finger surface to form mesh
Electrode, sensing electrode and target electrode shape sampling capacitance 13 are marked, driving electrodes form driving capacitance 12 with sensing electrode.Sensing electricity
Hold and be electrically connected with the first level driver vd1, sampling capacitance 13 is electrically connected with second electrical level driver Vd2；Fig. 2 a extremely
Sensing electrode driving electrodes and finger are considered as concatenated sampling capacitance 12 and driving capacitance by equivalent in Fig. 2 b, and sensing electrode passes through
Reset switch 11 is connect with reference voltage Vint.In the pressing of finger (not shown) when on fingerprint sensor surface, referring to
The size of sampling capacitance 13 in line sensor is related with the texture distance d on fingerprint surface；According to capacitance equation C=ε S/4 π
Kd wherein d are the distance between finger surface texture and sensing electrode.It is sampled when the crestal line on sensing electrode and fingerprint surface is formed
The sampling capacitance of the smaller formation of distance d is big compared with 13 when capacitance；When the valley line on sensing electrode and fingerprint surface forms sampling capacitance
The sampling capacitance 13 of the larger formation of distance d is small.Driving electrodes for so that sampling capacitance 13 in formed with fingerprint texture surface away from
From the corresponding quantities of electric charge of d；The sensing electrode of the crestal line of fingerprint and capacitor sampling circuit is apart from small in capacitive fingerprint sensor, and
The sensing electrode of valley line and capacitor sampling circuit distance is big, to valley line partition capacitance more, the crestal line portion that samples the quantity of electric charge Q to be formed
Capacitance is divided to sample the quantity of electric charge Q to be formed few.Further include the parasitic capacitance cb of equivalent parallel, the sampling electricity in fingerprint sensor
Hold 13 and capacitance 12 is driven to be connect respectively with charge transfer switch 14, the outlet end of charge transfer switch 14 is generated as charge
The output end out of circuit, while the input terminal of the output end out connection integrating circuit of charge generation circuit.As shown in Figure 2 b, more
A charge generation circuit 10 can form a charge and generate array, and each charge generation circuit 10 can pass through electric charge transfer
Switch 14 is connect with bus, and bus connects the defeated of integrating circuit 20 simultaneously as the output end out of multiple charge transfer switches 14
Enter end.
It please refers to Fig. 3 a to Fig. 3 c charges generation circuit 10 and generates charge, optical sensor using optical sensor 16
16 quantities of electric charge generated and luminous flux phase relation.Optical sensor 16 is preferably this skill such as photodiode, photo resistance
Art field known elements.Optical sensor 16 be used for receive finger surface (not shown) reflection light, and export with
The charge inducing of the relevant reflection finger print information ingredient of reflection light luminous flux.Due to the ridge of target finger and paddy and contact surface
Distance it is different, the luminous flux in the certain time of reflected light is also different, cause the charge that optical sensor 16 generates with
The variation of light and respective change.The first port with load circuit 15 and charge transfer switch 17 respectively of optical sensor 16
Connection, the output end out of the second port connection charge generation circuit of charge transfer switch 17.Output end out connections integrate
The input terminal of circuit, while optical sensor 16 is connected by reset switch 18 and reset reference voltage Verf.As shown in Figure 3b,
Multiple charge generation circuits 10 can form a charge and generate array.10 reusable reset switch of multiple charge generation circuits
18 and reset reference voltage 18, similar 10 reusable charge transfer switch 17 of multiple charge generation circuits, charge transfer switch
17 switch as level-one, and secondary switch 171 is arranged in 10 inside of charge generation circuit.Multiple charge generation circuits 10 as shown in Figure 3c
It is connect with bus, output end of the bus as multiple charge generation circuits 10, while connecting the input terminal of integrating circuit 20.
It please refers to Fig. 4 a to Fig. 4 c charge generation circuits and generates charge, the electricity that piezoelectric element 19 generates using piezoelectric element 19
Lotus amount is related to the mechanical shock energy that piezoelectric element 19 receives.Piezoelectric element 19 is preferably ultrasonic transducer, energy converter
Preferably piezoelectric ceramics makes the absorbable vibration of ultrasonic wave mechanical energy to be formed.Piezoelectric element 19 and ultrasonic pulse transmitting member
Part (not shown) is used cooperatively, and ultrasonic wave radiated element emits ultrasonic beam to finger.The wave crest and trough of fingerprint reflect
The energy that contains of ultrasound wave packages it is different, cause the charge for pressing piezoelectric element 19 to generate to be produced with the texture variations on fingerprint surface
Raw corresponding variation.Piezoelectric element 19 is connect with the first port of datum Vu and charge transfer switch 191 respectively, and charge turns
Remove the output end out for the other end connection charge generation circuit 10 for closing 191.
As shown in Figure 4 b, multiple charge generation circuits 10 form a charge and generate array.Multiple charges generate electricity
10 reusable charge transfer switch 191 of road and reference voltage Vrst.Similar 10 reusable charge of multiple charge generation circuits turns
Remove pass 191.Charge transfer switch 191 is switched as level-one, and secondary switch 190 is arranged inside charge generation circuit.Piezoelectricity member
Part 19 connects the first port of secondary switch, and the second port of secondary switch connects the first port of charge transfer switch 191,
The second port connection output end out of charge transfer switch 191.
As illustrated in fig. 4 c, multiple charge generation circuits are connect with bus, output of the bus as multiple charge generation circuits
End, while as the input terminal of integrating circuit.
40 schematic diagram of adjustment circuit shown in Fig. 5 a to Fig. 5 b is please referred to, adjustment circuit 40 includes adjustment shown in Fig. 5 a
First pole of capacitance Cc adjustment capacitances connect by adjusting switch 41 with the input terminal of the integrating circuit；Adjust the first of capacitance
Pole connects reference voltage Vint by the second reset switch 42；Second pole of adjustment capacitance 42 connect Vd3 with level driver.
The first pole connection adjustment switch 41 of capacitance Cc is adjusted, while the first pole connects reference voltage Vt by reset switch 42.Adjustment
The second pole of capacitance Cc connects reference voltage Vf or drive level Vd3.Adjustment circuit 40 shown in Fig. 5 b it is different from Fig. 5 a it
It is in and connects third level driver Vd3 in the second pole of adjustment capacitance, the voltage of third level driver Vd3 is variable.
Capacitance Cc tools are adjusted shown in Fig. 5 a and Fig. 5 b there are two types of working condition, one is reset state closed reduction 42, disconnects and adjusting
Whole switch 41 makes the adjustment capacitance Cc that the reference voltage Vt be connected, and adjustment capacitance is made to have initial charge amount.This is initial
The quantity of electric charge determines by adjustment capacitance Cc by the driving voltage difference and reference voltage Vt of third level driver Vd3, wherein
The flat driver of third can also be replaced with fixed reference voltage Vf.Secondly adjustment state, is closed adjustment switch 41, disconnects reset
Switch 42 makes the adjustment capacitance Cc that the integrating circuit 20 be connected so that the storage charge injection integral in adjustment capacitance
Circuit 20, to adjust the integrating rate of integrating circuit 20.In the electricity accumulated to integrating circuit using the adjustment circuit comprising capacitance
When lotus amount is adjusted, it can be seen that the charge adjustment amount of adjustment circuit is also to be repeatedly injected integral several times from the process of integral
In circuit, i.e., to the compensation of integrating circuit in time when it is discrete.
The adjustment circuit 40 with reference to shown in Fig. 5 c, adjustment circuit includes current source 43, and current source 43 is by adjusting switch 41
It is connect with the input terminal of charge generation circuit 10 and integrating circuit 20.Adjust the charge injection product of current source 43 when switch 41 is closed
Parallel circuit 20 adjusts the integrating rate of integrating circuit 20.With 40 different from of adjustment circuit shown in Fig. 5 a and Fig. 5 b, adjustment electricity
Two kinds of working conditions on road 40 are adjustment state and reset state, and adjustment switch makes adjustment circuit be led with integrating circuit when being closed
Logical, the charge of adjustment circuit injects integrating circuit.Adjustment switch disconnected 41 is reset state, integrating circuit 20 when opening.Using electricity
When 43 adjustment circuit of stream source is adjusted the quantity of electric charge that integrating circuit is accumulated, integrator can be adjusted according to the process of integrator
To be continuous in time or discontinuous, i.e., the quantity of electric charge that the described adjustment circuit is injected to integrating circuit is in time
It is continuous or discontinuous.
The integrating circuit includes amplifier, integrating capacitor and at least one reset switch, and the first of the integrating capacitor
Pole and the second pole are separately connected the first input end and output end of amplifier；The reset switch is for resetting the integral electricity
Hold.
Integrating circuit schematic diagram shown in Fig. 6 a to Fig. 6 c is please referred to, the integrating circuit includes first input end 22,
Two input terminals 23 and output end out, 10 output end of the connection charge of the first input end 22 generation circuit and adjustment circuit 40
Output end, the second input terminal connection reference voltage Verf1.Integrating circuit as shown in Figure 6 a includes amplifier Amp, integral electricity
Hold Cr and reset switch 21；Input terminal in of the first input end 22 of amplifier Amp as integrator 20, the second of amplifier are defeated
Enter output end out of the output end of end connection reference voltage Verf1, amplifier Amp as integrator.The both ends integrating capacitor Cr point
It Lian Jie not the first input end in of the amplifier Amp and output end out of amplifier.The first poles integrating capacitor Cr and second extremely lead to
The connection of reset switch 21 is crossed, integrating capacitor both ends level is identical when reset switch is closed 21, and the charge in integrating capacitor Cr is answered
Position empties.
Integrating circuit 20 as shown in Figure 6 b is that reset switch includes two 21/24 with Fig. 6 a differences, integrating capacitor
First pole is connect by the first reset switch 21 with the first reference voltage Verf1, the first reference voltage Verf1 and amplifier
23 reference voltages of the second input terminal are multiplexed.The second pole of integrating capacitor cr is by the second reset switch 24 connection second with reference to electricity
Vef2 is pressed, while the second pole of integrating capacitor Cr is by following switch 25 to connect the output end of amplifier Amp.Integrating circuit 20
There are two types of working conditions for tool, and one is integrating state, secondly being reset state.It charge transfer switch and is followed in integrating state
The switch of switch 25 is closed, and the first reset switch 21 and the second reset switch 24 disconnect.Secondly being reset state, in reset state
Switch 25 is followed to disconnect, two reset switches 21/25 are closed.
It includes integrating capacitor Cr, integral that integrating circuit as fig. 6 c is integrating circuit 10 only with Fig. 6 a, 6b differences
The input terminal in of the first pole connection integrating circuit of capacitance, while connecting the output end out of integrating circuit.The integrating capacitor Cr
The first pole connect with the first reference voltage Verf1 by reset switch, the second pole of integrating capacitor ground connection, by technical field people
The second pole of integrating capacitor Cr well known to member can also connect reference voltage.First pole of integrating circuit 10 connects reset switch
21, reset switch 21 connects the first reference voltage Verf1, and for integrating circuit tool there are two types of working condition, one is multiple for integrating state
Bit switch 21 disconnects, secondly being closed for reset state integral reset switch 21.
The course of work and operation principle of charge integration adjustment circuit are described further below.Please refer to Fig. 7 a and
Charge integration adjustment circuit shown in Fig. 7 b, charge generation circuit 10 include sampling capacitance 13, the output end of charge generation circuit
It is connect with the input terminal of integrating circuit 20 by charge transfer switch 14.
Total group of step of charge integration adjustment circuit include：
S1 resets product capacitance 20；
S2 disconnects charge transfer switch 14, adjustment switch 41；
S3 is closed charge generation circuit reset switch 42, is closed adjustment circuit reset switch 11；
S4 charge generation circuit drivers Vd2, it is height that Vd1, which controls signal, and adjustment circuit driver Vd3 control signals are
It is high；
S5 disconnects charge generation circuit reset switch 11, disconnects adjustment circuit reset switch 41.
S6 is closed charge transfer switch 14, is closed adjustment switch 41；
It is low, adjustment circuit level driver Vd3 controls that S7 charge generation circuit level drivers Vd1, Vd2, which control signal,
Signal is low；
S8 return to step S2.
In step S1 resets integrating circuit, in order to ensure that the consistency measured is needed in advance before integral to integrating capacitor
Cr resets.I.e. so that integrating capacitor Cr has, there are one initial electricity for the process of reset, it is assumed for example that at integrating capacitor both ends
Reference voltage Vref 1, Vref2 integrating capacitors Cr reset after electricity be Qrst=(Vref1-Vref2) * Cr.It is multiple in order to simplify
The structure of position circuit can be directly connected to the both ends (as shown in Figure 7a) of integrating capacitor Cr with reset switch 21, that is, integrate electricity after resetting
Hold the electricity Qrst=0 of Cr.The process of multiple integral is repeated several times for integrating circuit 20 that is, the charge of charge generation circuit generation is multiple
Repeat the process to charge to integrating capacitor Cr.And when charging every time to integrating capacitor Cr, adjustment circuit 10 is by adjusting switch 41
It is connect with the integrating circuit 10 and charge generation circuit 10, injects charge to the integrating circuit 20.
Between charge generation circuit 10 and adjustment circuit 41 electrical connection, the work of step S3 and S4 are disconnected in step s 2
Be formed in the adjustment capacitance CC of the sampling capacitance 13 in charge generation circuit 10 and driving capacitance 12 respectively it is certain initial
The quantity of electric charge.Wherein the quantity of electric charge of sampling capacitance 13 depends on finger surface distance, if sensing electrode top is the crestal line of finger
The quantity of electric charge is big, and the quantity of electric charge is small if sensing electrode top is the valley line of finger.It is charge to disconnect reset switch 11 in step s 5
Transfer is prepared.
It is closed charge transfer switch 14 in step S6, charge generation circuit 10 is electrically connected with integrating circuit 20；Adjustment circuit
40 inject charge to integrating circuit 10, are adjusted to the integral charge cumulative amount of integrating circuit 10.Enable the electricity of sampling capacitance 13
Capacitance is Cf, and the capacitance of driving capacitance 12 is Cd, and the capacitance of parasitic capacitance is Cb, charge generation circuit and integrating circuit
The value of 10 bus parasitic capacitance is Cp, and the value of charge generation circuit reference voltage is Vint, 30 reference voltage of comparison circuit
Value is VREF3, and adjustment circuit reference voltage is VREF5, and the first level driver high level is that V12 low levels are V11, the second electricity
Flat driver high level is that V22 low levels are V21, and it is V31 that third level driver high level, which is V32 low levels,.Define Δ V1
=V12-V11, Δ V2=V22-V21, Δ V3=V32-V31, Δ VREF=VREF1-.
According to charge balance concept and integrator operation principle, the charge Δ that integrating capacitor Cr charges every time can be obtained
Q：Δ Q=(Δ VREF- Δ V1) * Cf+ (Δ VREF- Δ V2) * Cd+ Δ VREF*Cb+ (Δ V3+VREF1-VREF5) * Cc.
As can be seen that adjustment circuit makes charge transfer quantity produce a quantity of electric charge (Δ V3+VREF1- from above equation
VREF5)*Cc.When contained in Cf larger DC component affect fingerprint AC compounent extraction when, conjunction can be passed through
The value of configuration the Δ V3, VREF5 and Cc of reason, neutralize the quantity of electric charge that DC component in Cf is brought；Due to the direct current in Cf point
Amount is a variable quantity, and acquisition is all likely to be encountered different Cf to fingerprint sensor every time, also has different DC components certainly.Institute
It just needs to make and can adjust in real time to compensate the quantity of electric charge, i.e., third level driver is that adjustable level driver so that Δ V3 can
It adjusts or compensating electric capacity Cc is tunable capacitor, to form the different compensation quantities of electric charge for different sampling capacitances.That is,
The rate and polarity for the quantity of electric charge that adjustment circuit is injected to integrating circuit can be arranged.
Charge generation circuit 10 can carry out arrangement form sensor array in the way of array in Fig. 7 a, Fig. 7 b,
Including：Pel array includes the charge generation circuit 10 of ranks arrangement, non-electrical signal amount is converted to associated charge
Amount；Integrating circuit 20, input terminal are connect with the output end of charge generation circuit；Integrating circuit 20 is for accumulating the quantity of electric charge
And it exports and non-electrical signal amount associated electrical signals；The input terminal of adjustment circuit 40, output end and integrating circuit connects；And to integral
Circuit injects charge and adjusts integrating circuit charge cumulative amount；Comparison circuit 30, the first input end and integrating circuit of comparison circuit
Output end connection, the second input terminal of comparison circuit connects reference voltage, and the output voltage of integrating circuit 20 is incremented by any time
Or successively decreases and intersect with the reference voltage；Comparison circuit output and time correlation when integral voltage intersects with the reference voltage
Turnover voltage signal.
Image Acquisition is carried out to surface above it in a manner of using dot matrix, 90*90 is used in fingerprint sensor
Pixel, rate is 500ppi capacitor arrays respectively.Since what is formed between fingerprint surface and sensing electrode adopts in fingerprint sensor
Sample capacitance very little, therefore need to repeat to charge to integrating capacitor Cr when acquisition image, the process of integrating capacitor recharge
For：
S1 resets integrating circuit；
S2 breaks charge transfer switch 14, disconnects adjustment switch 41；
S3 is closed charge generation circuit reset switch 11, is closed adjustment circuit reset switch 42；
10 driver Vd1/Vd2 control signals of S4 charges generation circuit are height, 40 driver Vd3 control letters of adjustment circuit
Number for height；
S4 disconnects 10 reset switch 11 of charge generation circuit, disconnects 40 reset switch 42 of adjustment circuit；
S5 is closed charge transfer switch 11, is closed adjustment switch 41；
The first level drivers of S6 Vd1 control signals are low, and second electrical level driver Vd2 control signals are low, third electricity
Flat driver Vd3 controls signal is low；
S7 return to step S2.
The step of wherein step S2 to step S4 is reset charge generation circuit 10 and resets adjustment circuit 41, the purpose is to
So that the adjustment capacitance CC of the sampling capacitance 13 and adjustment circuit 10 inside charge generation circuit 10 has certain initial charge
Amount.
Charge transfer switch 14 is closed in step s 5 to be closed so that charge generation circuit 10 is electrically connected with integrating circuit 20.
Adjustment circuit 10 injects charge to integrating circuit 20, is adjusted to the integral charge cumulative amount of integrating circuit 20, it is same its
Meet equation i.e. Δ Q=(Δ VREF- Δ V1) * Cf+ (Δ VREF- Δ V2) * Cd+ Δs of charge adjustment circuit in charge such as Fig. 7 a
VREF*Cb+(ΔV3+VREF1-VREF5)*Cc。
The level driver of the level driver Vd1/Vd2 of charge generation circuit 10 and adjustment circuit resets in step s 6
Vd3, the process for electric charge transfer next time are prepared.
It subsequently enters step S7 and repeats step S2 to step S6.
The first input end of the output end of integrating circuit 20 and comparison circuit connects, in sampling capacitance 13 to integrating capacitor
During Cr recharges, the corresponding charge transfer quantity of process for often completing an electric charge transfer is above-mentioned Δ Q.Integrating capacitor
Charge is constantly accumulative in Cr will produce unidirectional variation to the output of integrating circuit, when to reach comparison electric for the output of integrating circuit 10
When the reference voltage Verf3 on road 30, the voltage signal that comparison circuit 30 exports can be overturn, and the time T of overturning is as fingerprint
The output of sensor.It is VREF3 to enable the value of comparison reference voltage, then integrating capacitor Cr at the time of 30 output switching activity of comparison circuit
Quantity of electric charge Qr.end=(VREF3-VREF2) * Cr.
The flip-flop transition of comparison circuit is that T=(Qr.end-Qr.rst)/Δ Q designs given fingerprint sensor,
(Qr.end-Qr.rst) it is definite value, and is the linear function of sampling capacitance 13 according to formula Δ Q.In engineering in practice for letter
Just T roundings export as a result.
Charge integration adjustment circuit shown in Fig. 8 a and Fig. 8 b is please referred to, using optical profile type charge generation circuit 10, in order to
So that the crestal line and the corresponding quantity of electric charge of strand of the electric charge generation circuit 10 form measurable voltage signal.Charge produces
Raw 10 output end of circuit is connected by charge transfer switch 17 with the input terminal for connecting integrating circuit 20, charge integration adjustment circuit
Total group of step include：
S1 resets product circuit 20；
S2 reset charges generation circuit 10 resets adjustment circuit 40；
S3 is closed charge transfer switch 17 and multiplex switch 171, is closed adjustment switch 41；
S4 return to step S2.
The method that integrator resets in step sl is identical as integrating circuit repositioning method shown in Fig. 7 a and Fig. 7 b.
Charge generation circuit 10 is resetted by reset switch 18 in step s 2, and adjustment circuit 10 disconnects adjustment switch
41 are resetted.
It is closed charge transfer switch 17 and multiplex switch 171, charge generation circuit 10 and 20 electricity of integrating circuit in step S3
Connection.Adjustment circuit 40 injects charge to integrating circuit 20, is adjusted to the integral charge cumulative amount of integrating circuit 20.Charge
The output end of generation circuit 10 is connected to the input terminal of integrating circuit, the output end of integrating circuit 10 by charge transfer switch 17
It is connected to the input terminal of comparison circuit 30.Output of the output end of comparison circuit 30 as sensor, the output of comparison circuit 30 are turned over
The time T reflection charge generation circuit 10 of converting voltage signal produces the size of the quantity of electric charge.
When the value of 20 output voltage of integrating circuit, which is changed to, intersects with the reference voltage Verf3 in comparison circuit 30,
Comparison circuit 30 overturns output signal.Time T=(Qr.end-Qr.rst)/(I of signal overturningL-In), ILIt is considered as one
In section of fixing time by mean charge, InIt is considered as and integral integrating capacitor 20 is compensated by adjusting circuit 40 within a certain period of time
Mean charge amount.Given fingerprint sensor is designed, Qr.end-Qr.rst is definite value, (IL-In) it is sampling capacitance
13 linear function, in engineering, T roundings export as a result for simplicity in practice.
Embodiment three,
Charge integration adjustment circuit shown in Fig. 9 a and Fig. 9 b is please referred to, using piezoelectric type charge generation circuit 10, in order to
So that the crestal line and the corresponding quantity of electric charge of strand of the piezoelectric type charge life circuit 10 form measurable voltage signal.Piezoelectric type
The input terminal that 10 output end of charge generation circuit connects integrating circuit 20 by charge transfer switch 191 connects, charge integration tune
Total group of step of whole circuit include：
S1 resets product circuit 20；
S2 reset charges generation circuit 10 resets adjustment circuit 40；
S3 is closed charge transfer switch 191 and is closed multiplex switch 191, is closed adjustment switch 41；
S4 return to step S2.
The method that integrating circuit 20 resets in step sl and 20 repositioning method of integrating circuit shown in Fig. 7 a and Fig. 7 b
It is identical.
Include step S21 in step s 2,10 closed reduction of charge generation circuit opens 192 and puts capable reset into；Further include
S22, adjustment circuit adjust 41 closed reduction switch 42 of switch by disconnection and are resetted.
It is closed charge transfer switch 191 in step S3, charge generation circuit 10 is electrically connected with integrating circuit 20, adjustment electricity
Charge is injected in road 10 to integrating circuit 20, is adjusted to the integral charge cumulative amount of integrating circuit 10.Charge generation circuit 10
Output end the input terminal of integrating circuit 20 is connected to by charge transfer switch 191, the output end of integrating circuit 20 is connected to
The input terminal of comparison circuit 30.Output of the output end of comparison circuit 30 as sensor, 30 output switching activity voltage of comparison circuit
The size of the time T reflection charge generation circuit production quantity of electric charge of signal.
When the variation of the value of the integrating circuit output voltage 20 intersects with the reference voltage level in comparison circuit, comparison circuit
30 overturn output signal.The process that integrating capacitor Cr is integrated in step s3 with shown in Fig. 7 a and Fig. 7 b
It is similar to the integral process of integrating circuit.The flip-flop transition of comparison circuit is T=(Qr.end-Qr.rst)/Δ Q, for given
Fingerprint sensor design (Qr.end-Qr.rst) be definite value, and according to formula Δ Q and compensating electric capacity CC initialization quantity of electric charge phases
It closes.In engineering, T roundings export as a result for simplicity in practice.
Example IV
The utility model also provides a kind of obtaining based on adjustment circuit acquisition charge integrating circuit mismatch adjusting parameter
Take method, including step：
S1：It is that acquiescence inputs that charge generation circuit, which is arranged,；
S2：When m- voltage coordinate plane on setting target point (T0, V0)；
S3：To the different configuration parameters of adjustment circuit setting, the corresponding charge integration electricity of each configuration parameter is obtained
Road when m- voltage coordinate plane on output characteristic curve；
S4：It chooses and the target point (T0, V0) immediate output characteristic curve；
S5：It obtains adjustment circuit corresponding with the immediate output characteristic curve of the target point and configures parameter.
In step sl, the acquiescence input refers to that charge generation circuit does not have any external input or only includes that background is defeated
Enter.It is that acquiescence inputs, but acquiescence inputs herein that fingerprint sensor when finger is not provided with such as in fingerprint sensor, on sensor
Signal in include the background signal of fingerprint sensor itself；
In the step S2, which works as sensing in order to which verificating sensor configures parameter and is arranged
The output characteristic curve of device can pass through or very close to target point (T0, V0), then it is assumed that sensor configuration parameter, which can reach, to be set
Count target.
In the step S3, the circuit configuration parameter includes but not limited to：Reference voltage Verf1, reference voltage
Vrst, reference voltage Verf3, Vint.Include step for arbitrary adjustment circuit configuration parameter Ki：
S31：Initialize integrating circuit；The initial method is identical as the method for embodiment one to embodiment three.
S32：Set adjustment circuit configuration parameter to Ki；
S33：Charge integrating circuit described in continuous service；It is silent in the input of charge generation circuit to run the integrating circuit
The process of its output valve is obtained when recognizing value.
S34：Describe the charge integrating circuit when m- voltage coordinate plane on output characteristic curve；The output is special
Linearity curve is in the corresponding output valve of different moments charge integrating circuit.
Preferably, integrating circuit output characteristic curve when different configuration parameters, to pass through a plurality of straight of same initial point
Line；The coordinate value of the same initial point is that (0, V) wherein V represents the initial voltage value of integrating circuit.
Illustratively, it is different configuration parameter integral circuit output voltage characteristic curves to please refer to Figure 10, and abscissa indicates
Voltage unit, ordinate indicate chronomere.Four oblique lines correspond to charge generation circuit integrator under different configuration parameters respectively
Output voltage characteristic curve is expressed as L1, L2, L3, L4.Target point P coordinates therein are that (T0, V0) can from figure
Go out and add up constantly in integrating capacitor with charge, output voltage characteristic curve (L1, L2, L3, L4) constantly declines but in difference
The decrease speed for configuring the output voltage under parameter is different.Wherein output voltage L2 passes through target point P, i.e., in the defeated of sensor
Go out voltage response be L2 when, the configuration parameter of integrating circuit can reach design object.
Sensor array is formed for multiple charge generation circuits, identical target point P can be set, and using same
Method adjustment configuration parameter so that different charge generation circuit output characteristics is identical, so as to improve the shape of integrating circuit mismatch
Condition.
The advantage of the utility model compared with the prior art is, charge adjustment circuit, to integrating circuit inject positive charge or
Negative electrical charge, to adjust the integration rate of integrating circuit.The polarity and rate that charge is injected by the way that charge adjustment circuit is arranged, can be with
Adjustment charge integration rate is played, integrating circuit mismatch is compensated.
Claims (17)
1. a kind of charge type sensor, which is characterized in that including：
Charge generation circuit, output size with the relevant quantity of electric charge measured by sensing；
Integrating circuit, input terminal are connect with the output end of charge generation circuit；Integrating circuit is used to accumulate the quantity of electric charge, and
Output and the relevant electric signal of the quantity of electric charge accumulated；
The input terminal of adjustment circuit, output end and integrating circuit connects；Adjustment circuit is used to inject charge to integrating circuit to adjust
The rate of whole integrating circuit stored charge.
2. a kind of charge type sensor according to claim 1, which is characterized in that the charge generation circuit passes through charge
Transfer switch is connect with integrating circuit.
3. a kind of charge type sensor according to claim 2, which is characterized in that the charge generation circuit passes for capacitance
Inductive circuit, the quantity of electric charge of generation are related to the size of sensing capacitance.
4. a kind of charge type sensor according to claim 2, which is characterized in that the charge generation circuit is photoelectric transfer
Inductive circuit, the quantity of electric charge of generation are related to the size of the light energy of reception.
5. a kind of charge type sensor according to claim 2, which is characterized in that the charge generation circuit passes for pressure
Inductive circuit, the quantity of electric charge of generation are related to the size for the pressure being subject to.
6. a kind of charge type sensor according to claim 1, it is characterised in that：The integrating circuit includes the first input
End, the second input terminal and output end, the output end of first input end connection the charge generation circuit output end and adjustment circuit,
Second input terminal connects reference voltage.
7. a kind of charge type sensor according to claim 6, it is characterised in that：The integrating circuit include amplifier,
It is first defeated to be separately connected amplifier for integrating capacitor and at least one reset switch, the first pole and the second pole of the integrating capacitor
Enter end and output end；The reset switch is for resetting the integrating capacitor.
8. a kind of charge type sensor according to claim 7, it is characterised in that：The first pole of the integrating capacitor and second
Pole is connected by reset switch.
9. a kind of charge type sensor according to claim 7, it is characterised in that：First pole of the integrating capacitor passes through
Reset switch is connect with reference voltage, the second pole ground connection of integrating capacitor.
10. a kind of charge type sensor according to claim 7, it is characterised in that：The first of the integrating capacitor is extremely logical
It crosses the first reset switch to connect with the first reference voltage, the second pole of integrating capacitor passes through the second reset switch and the second reference electricity
Pressure connection；Second pole is by following switch to be connect with the output end of the amplifier.
11. a kind of charge type sensor according to claim 1, which is characterized in that the adjustment circuit is to integrating circuit
The rate and polarity of the quantity of electric charge of injection can be arranged.
12. a kind of charge type sensor according to claim 11, which is characterized in that the adjustment circuit is to integrating circuit
The quantity of electric charge of injection is continuous or discontinuous in time.
13. a kind of charge type sensor according to claim 12, it is characterised in that：The adjustment circuit includes adjustment electricity
Hold, adjusts the first pole of capacitance and connect with the input terminal of the integrating circuit by adjusting switch；Adjust capacitance first is extremely logical
Cross the second reset switch connection reference voltage；Second pole of adjustment capacitance is connect with level driver.
14. a kind of charge type sensor according to claim 12, it is characterised in that：The adjustment circuit includes electric current
Source, current source connect by adjusting switch with the input terminal of the integrating circuit.
15. a kind of charge type sensor according to claim 14, it is characterised in that：Adjustment circuit includes two kinds of work shapes
State：
Adjustment state so that adjustment circuit is connected with integrating circuit, and the charge of adjustment circuit injects integrating circuit；
Reset state carries out reset setting to the parameter of adjustment circuit.
16. a kind of charge type sensor according to claim 1, which is characterized in that further include comparison circuit, comparison circuit
First input end and the output end of integrating circuit connect, the second input terminal of comparison circuit connects reference voltage.
17. a kind of sensor array, which is characterized in that including：
Pel array includes the charge generation circuit of ranks arrangement, non-electrical signal amount is converted to the associated quantity of electric charge；
Integrating circuit, input terminal are connect with the output end of charge generation circuit；Integrating circuit is for accumulating the quantity of electric charge simultaneously
Output and non-electrical signal amount associated electrical signals；
The input terminal of adjustment circuit, output end and integrating circuit connects；
And adjust integrating circuit charge cumulative amount to integrating circuit injection charge；
Comparison circuit, the first input end of comparison circuit and the output end of integrating circuit connect, the second input terminal of comparison circuit
Reference voltage is connected, increasing or decreasing intersects the output voltage of integrating circuit with the reference voltage at any time；Integral voltage with
The turnover voltage signal of comparison circuit output and time correlation when the reference voltage intersects.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721283679.5U CN207690103U (en) | 2017-09-30 | 2017-09-30 | A kind of charge type sensor and the sensor array with it |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721283679.5U CN207690103U (en) | 2017-09-30 | 2017-09-30 | A kind of charge type sensor and the sensor array with it |
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