CN102279924A - Fingerprint identification system and testing device - Google Patents
Fingerprint identification system and testing device Download PDFInfo
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- CN102279924A CN102279924A CN2010102033783A CN201010203378A CN102279924A CN 102279924 A CN102279924 A CN 102279924A CN 2010102033783 A CN2010102033783 A CN 2010102033783A CN 201010203378 A CN201010203378 A CN 201010203378A CN 102279924 A CN102279924 A CN 102279924A
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Abstract
The invention provides a fingerprint identification system and a testing device comprising the fingerprint identification system. The fingerprint identification system comprises a fingerprint sensor and a drive circuit unit. The fingerprint sensor is used for detecting a fingerprint pattern and converting the fingerprint pattern into a discrete simulation signal about fingerprint information. The drive circuit unit is used for carrying out data processing on the discrete simulation signal detected by the fingerprint sensor, and the drive circuit unit comprises the following parts: a controller used for driving the fingerprint sensor; a sampling maintenance circuit used for acquiring and maintaining instantaneous voltage of the discrete simulation signal, and forming a continuous simulation signal; an analog-to-digital conversion unit used for converting the continuous simulation signal into a digital signal; a full scale voltage adjusting unit used for adjusting full scale voltage of the analog-to-digital conversion unit, wherein the full scale voltage is maximum input voltage when the analog-to-digital conversion unit carries out analog-to-digital conversion. The fingerprint identification system has the advantages of excellent performance, a high yield rate, and elimination of a short service life problem caused by an aging problem.
Description
Technical field
The present invention relates to the semiconductor transducer technical field, relate in particular to fingerprint recognition system and proving installation.
Background technology
Along with the development of fingerprint identification technology, fingerprint recognition system is applied in the daily life more and more, and for example fingerprint identification entrance guard system has the notebook computer of fingerprint recognition etc.In being the Chinese patent application of 200810188287.X, application number discloses a kind of technical scheme of fingerprint identification device.
With reference to figure 1, show the synoptic diagram of prior art fingerprint recognition system.Fingerprint recognition system comprises: fingerprint sensor 100 and drive circuit unit 200, wherein: fingerprint sensor 100 is used to survey fingerprint pattern, and convert described fingerprint pattern to discrete analog signal about finger print information, drive circuit unit 200, be used to drive described fingerprint sensor 100, and the discrete analog signal that fingerprint sensor 100 detects is carried out data processing.
Wherein, drive circuit unit 200 comprises: the controller 201 that is connected with described fingerprint sensor 100, the sample-and-hold circuit 202 that is connected with described fingerprint sensor 100, and the AD conversion unit 203 that links to each other with described sample-and-hold circuit 202.Wherein, described controller 201 is used to drive described fingerprint sensor 100; Sample-and-hold circuit 202 is used for converting the discrete analog signal that fingerprint sensor 100 detects to about finger print information continuous analog signal; AD conversion unit 203 is used for described continuous analog conversion of signals is become digital signal about finger print information.
Yet in the prior art, because the restriction of manufacturing process, the simulating signal about finger print information that fingerprint sensor detects is less usually, when carrying out analog to digital conversion, the voltage of some simulating signal is not in the scope of AD conversion unit input voltage, the digital signal that analog to digital conversion obtains can not truly reflect finger print information, make described fingerprint recognition system when carrying out fingerprint recognition, be easy to generate error, cause the higher sincere (FRR that refuses, False Rejection Rate) or accuracy of system identification (FAR, False Acceptance Rate).
Summary of the invention
The present invention solves provides a kind of fingerprint recognition system, to improve the performance of fingerprint recognition system.
For addressing the above problem, the invention provides a kind of fingerprint recognition system, described fingerprint recognition system comprises: fingerprint sensor is used to survey fingerprint pattern, and converts described fingerprint pattern to about finger print information discrete analog signal; Drive circuit unit, the discrete analog signal that is used for fingerprint sensor is detected carries out data processing, and described drive circuit unit comprises: controller is used to drive described fingerprint sensor; Sample-and-hold circuit is used to gather and keep the instantaneous voltage of discrete analog signal, forms the continuous analog signal; AD conversion unit, being used for the continuous analog conversion of signals is digital signal; Full scale voltage-regulation unit is used to regulate the full scale voltage of AD conversion unit, and described full scale voltage is that AD conversion unit is carried out analog-to-digital maximum input voltage.
Alternatively, full scale voltage-regulation unit comprises first register and regulator, wherein, and first register, be used to be provided with many group reference voltages and the full scale voltage corresponding with described reference voltage, described reference voltage comprises first reference voltage and second reference voltage; Regulator is used for according to regulating command, selects first reference voltage and second reference voltage from first register, and in AD conversion unit selected first reference voltage and second reference voltage is set; AD conversion unit obtains corresponding full scale voltage based on described first reference voltage and second reference voltage.
Alternatively, full scale voltage is 1～1.1 times of continuous analog signal maximum voltage.
Alternatively, also comprise compensating unit, be used for, before analog to digital conversion, make the reference potential generation potential shift of simulating signal, reduce described reference potential according to bias order.
Alternatively, described compensating unit comprises second register and deviator, and described second register is used to be provided with many group offset voltage value, and described deviator is used for according to bias order, make the reference potential of simulating signal reduce a side-play amount, described side-play amount is the offset voltage value in second register.
Alternatively, described reference potential is less than 0.1 times of full scale voltage.
Alternatively, also comprise gain unit, be used for before analog to digital conversion, simulating signal being amplified, increase the voltage of simulating signal according to gain command.
Alternatively, gain unit comprises the 3rd register and amplifier, and described the 3rd register is used to be provided with many group gain multiples; Described amplifier is used for the gain multiple according to the 3rd register, increases the voltage of simulating signal.
Alternatively, described simulating signal is the discrete analog signal about finger print information that sample-and-hold circuit processing formed continuous analog signal in back or fingerprint sensor detect.
Correspondingly, the present invention also provides a kind of proving installation that comprises described fingerprint recognition system, and wherein, described proving installation also comprises measuring appliance and determining device; Described measuring appliance is used to measure the digital signal of AD conversion unit output, and measurement result is sent to determining device; Described determining device, be used to judge that whether the digital signal maximal value of described measuring appliance measurement is more than or equal to the digital signal high threshold, when described digital signal maximal value during less than the digital signal high threshold, the regulator to full scale voltage-regulation unit sends regulating command.
Correspondingly, the present invention also provides a kind of proving installation that comprises described fingerprint recognition system, and wherein, described proving installation also comprises measuring appliance and determining device; Described measuring appliance is used to measure the digital signal of AD conversion unit output, and measurement result is sent to determining device; Described determining device, be used to judge that whether the digital signal maximal value of described measuring appliance measurement is more than or equal to the digital signal high threshold, when described digital signal maximal value during less than the digital signal high threshold, the regulator to full scale voltage-regulation unit sends regulating command; Described determining device is used to also to judge whether the digital signal minimum value that described measuring appliance is measured is less than or equal to the low threshold value of digital signal, when described digital signal minimum value during greater than the low threshold value of digital signal, sends bias order to the deviator of compensating unit.
Correspondingly, the present invention also provides a kind of proving installation that comprises described fingerprint recognition system, and wherein, described proving installation also comprises measuring appliance and determining device; Described measuring appliance is used to measure the digital signal of AD conversion unit output, and measurement result is sent to determining device; Described determining device, be used to judge that whether the digital signal maximal value of described measuring appliance measurement is more than or equal to the digital signal high threshold, when described digital signal maximal value during less than the digital signal high threshold, the regulator to full scale voltage-regulation unit sends regulating command; Described determining device is used to also to judge whether the digital signal minimum value that described measuring appliance is measured is less than or equal to the low threshold value of digital signal, when described digital signal minimum value during greater than the low threshold value of digital signal, sends bias order to the deviator of compensating unit; Described determining device, also be used for when analog to digital converter is exported the digital signal maximal value less than the digital signal high threshold, judge that whether first reference voltage of regulator setting and second reference voltage are the minimum value of first reference voltage and second reference voltage in first register, if minimum value is then sent gain command to the amplification phase.
Compared with prior art, the present invention has the following advantages: because described fingerprint recognition system comprises full scale voltage-regulation unit, can enlarge the scope of AD conversion unit input voltage, make input voltage in a big way when analog to digital conversion, have higher resolution, make the digital signal that obtains after the analog to digital conversion reflect user's fingerprint pattern more realistically, thereby optimized the performance of fingerprint recognition system.
Description of drawings
Fig. 1 is the synoptic diagram of prior art fingerprint recognition system;
Fig. 2 is the synoptic diagram of fingerprint recognition system one better embodiment of the present invention;
Fig. 3 is the synoptic diagram of fingerprint recognition system one preferred embodiment of the present invention;
Fig. 4 is the synoptic diagram that comprises the proving installation of fingerprint recognition system shown in Figure 3;
Fig. 5 is the synoptic diagram of another embodiment of fingerprint recognition system of the present invention;
Fig. 6 is the synoptic diagram of another embodiment of fingerprint recognition system of the present invention;
Fig. 7 is the fingerprint recognition system of the present invention synoptic diagram of an embodiment again.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can more be become apparent, the specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing.
At the problem in the background technology, the invention provides a kind of fingerprint recognition system.With reference to figure 2, show the synoptic diagram of fingerprint recognition system one better embodiment of the present invention.Described fingerprint recognition system comprises: fingerprint sensor 100 is used to survey fingerprint pattern, and converts described fingerprint pattern to about finger print information discrete analog signal; Drive circuit unit 200, the discrete analog signal that is used for fingerprint sensor 100 is detected carries out data processing, wherein, described drive circuit unit 200 comprises: controller 201, be used to drive described fingerprint sensor 100, make fingerprint sensor 100 begin to survey fingerprint pattern, described controller 201 can be a sequential control circuit;
Sample-and-hold circuit 202 is used to gather the discrete analog signal instantaneous voltage at a time that fingerprint sensor 100 detects, and keeps described instantaneous voltage constant in follow-up analog-digital conversion process, to obtain the continuous analog signal;
Described drive circuit unit 200 also comprises: full scale voltage-regulation unit 203, gain unit 204 and compensating unit 205, wherein,
Full scale voltage-regulation unit 203 is used for according to regulating command, regulates the full scale voltage of AD conversion unit 206, to regulate the scope of AD conversion unit 206 input voltages;
Compensating unit 205 is used for according to bias order, makes continuous analog signal criterion current potential generation potential shift, reduces described reference potential.
Described full scale voltage is the parameter of AD conversion unit 206, is that AD conversion unit 206 can be carried out analog-to-digital maximum input voltage.During as the input of AD conversion unit 206, can obtain the maximum output digital signal of AD conversion unit 206 with full scale voltage.For example, for the AD conversion unit of 8 bits, full scale voltage is 5V, and during analog to digital conversion, the input voltage of described 5V is corresponding to the digital signal of " 11111111 ".
Because full scale voltage is that AD conversion unit 206 can be carried out analog-to-digital maximum input voltage, described full scale voltage can be used for determining the input voltage range of AD conversion unit 206, in the present embodiment, continuous analog voltage of signals should be less than full scale voltage.
In addition, in order to improve analog-to-digital resolution, full scale voltage need equal or be slightly larger than the maximum voltage of continuous analog signal, under the perfect condition, full scale voltage need equal the maximum voltage of continuous analog signal, like this, when analog to digital conversion, can obtain all digital signals of AD conversion unit 206, for example for the AD conversion unit 206 of 8 bits, for example, full scale voltage is 5V, and the maximum voltage of continuous analog signal is 5V, after the analog to digital conversion, AD conversion unit 206 exportable 256 kinds of digital signals, described 256 kinds of digital signals embody continuous analog voltage of signals size well, and in the side circuit, the maximal value of continuous analog signal voltage can be slightly less than the full scale voltage of AD conversion unit 206, after the analog to digital conversion, AD conversion unit 206 exportable nearly 256 kinds of digital signals.
The full scale voltage of AD conversion unit 206 is regulated in described full scale voltage-regulation unit 203, makes full scale voltage greater than the continuous analog signal voltage, simultaneously, full scale voltage greater than or be slightly larger than continuous analog signal maximum voltage.Particularly, full scale voltage is 1～1.1 times of continuous analog signal maximum voltage.
In the prior art, the simulating signal that fingerprint sensor detects is very little, cause the full scale voltage of the maximum voltage of continuous analog signal much smaller than AD conversion unit, at this moment in the analog to digital conversion, have to the AD conversion unit digital signal of fraction, cause analog-to-digital resolution lower, thereby cause fingerprint recognition system can't obtain high-resolution fingerprint pattern.The present invention regulates full scale voltage by full scale voltage-regulation unit, make the maximum voltage of continuous analog signal be equal to or slightly less than described full scale voltage, can obtain the fingerprint pattern of high-resolution, reduce and refused sincere or accuracy of system identification, make fingerprint sensor have excellent performance.In addition, described gain unit can amplify the continuous analog voltage of signals of sample-and-hold circuit output, is equal to or slightly less than the condition of described full scale voltage with the maximum voltage that satisfies the continuous analog signal, thereby obtains high-resolution fingerprint pattern.
When the reference potential in the continuous analog signal is big, in analog-digital conversion process, can be converted into bigger digital signal, analog-converted unit 206 exportable digital signal quantity are reduced, cause fingerprint recognition resolution lower.Compensating unit 205 is used for making continuous analog signal reference potential generation potential shift, and the reference potential that makes the continuous analog signal is less than 0.1 times of full scale voltage.Thereby make described reference potential through the less digital signal of output after the analog to digital conversion, improving fingerprint can recognition resolution, and that reduces fingerprint recognition system refuses sincere or accuracy of system identification, improves the performance of fingerprint sensor.
With reference to figure 3, show the synoptic diagram of fingerprint recognition system one preferred embodiment.Simultaneously with reference to figure 2, described full scale voltage-regulation unit 203 comprises first register 2031 and regulator 2032, first register 2031 wherein, be used to be provided with many group reference voltages and the full scale voltage corresponding with reference voltage, particularly, reference voltage comprises first reference voltage and second reference voltage; Regulator 2032 is used for according to regulating command, selects first reference voltage and second reference voltage from first register 2031, and in AD conversion unit 206 selected first reference voltage and second reference voltage is set; AD conversion unit 206 can obtain corresponding full scale voltage based on described first reference voltage and second reference voltage, thereby finishes the adjusting of full scale voltage; Gain unit 204 comprises the 3rd register 2041 and amplifier 2042, and described the 3rd register 2041 is used to be provided with many group gain multiples; Described amplifier 2042 is used for the gain multiple according to the 3rd register 2041, amplifies the continuous analog voltage of signals.
Compensating unit 205 comprises second register 2051 and deviator 2052, described second register 2051 is used to be provided with many group offset voltage value, described deviator 2052 is used to make the reference potential of continuous analog signal to be offset, and side-play amount is the offset voltage value in second register 2051.
With reference to figure 4, show the synoptic diagram of the proving installation that comprises fingerprint recognition system shown in Figure 3.Described proving installation also comprises: measuring appliance 302, determining device 301, wherein,
Measuring appliance 302 is used to measure the digital signal of AD conversion unit 206 outputs, and measurement result is sent to determining device 301;
Determining device 301, be used to judge that whether the digital signal maximal value of described measuring appliance 302 measurements is more than or equal to the digital signal high threshold, when described digital signal maximal value during less than the digital signal high threshold, the regulator 2032 to full scale voltage-regulation unit 203 sends regulating command;
The regulating command that regulator 2032 sends according to determining device 301, from first register 2031, choose than first reference voltage and second reference voltage less first reference voltage and second reference voltage of Set For Current in AD conversion unit 206, to obtain less full scale voltage, and then satisfy the maximum voltage that full scale voltage equals or be slightly larger than the continuous analog signal, satisfy the digital signal high threshold thereby obtain bigger digital signal;
Wherein, described digital signal high threshold, according to the design specification setting, for example the digital signal high threshold is 0.9 of the maximum output of an AD conversion unit digital signal by the designer.Usually for the high fingerprint sensor of performance requirement, the digital signal high threshold is higher, and is general for performance requirement, and the digital signal high threshold is lower.
Described determining device 301, can also be used for when analog to digital converter 206 is exported the digital signal maximal values less than the digital signal high threshold, judge that whether first reference voltage that regulator 2032 is provided with and second reference voltage are the minimum value of first reference voltage and second reference voltage in first register 2031, if then send gain command to amplifier 2042;
The amplifier 2042 of described gain unit 204 is chosen bigger gain multiple according to described gain command from the 3rd register 2041, amplify the continuous analog voltage of signals.
When first reference voltage of full scale voltage regulator setting and second reference voltage are the maximal value of first reference voltage and second reference voltage in first register 2031, illustrate that the continuous analog signal is too little, even be adjusted to maximum full scale voltage by full scale voltage-regulation unit 203, can't realize that also full scale voltage equals or be slightly larger than the requirement of the maximum voltage of continuous analog signal, at this moment, amplify by 204 pairs of continuous analog signals of gain unit, make amplified analog signal be equal to or slightly less than full scale voltage, thereby realize higher fingerprint recognition performance.
Described determining device 301, can also be used to judge whether the digital signal minimum value that described measuring appliance 302 is measured is less than or equal to the low threshold value of digital signal, when described digital signal minimum value during, send bias order to the deviator 2052 of compensating unit 205 greater than the low threshold value of digital signal;
The bias order that described deviator 2052 sends according to determining device 2032 reduces the reference potential of continuous analog signal, makes to reduce the digital signal that the reference potential behind the current potential obtains through AD conversion unit 206 backs and be less than or equal to the low threshold value of digital signal;
Wherein, described digital signal is hanged down threshold value, and according to the design specification setting, for example the low threshold value of digital signal is maximum 0.1 times of exporting digital signal of AD conversion unit by the designer.Usually for the high fingerprint sensor of performance requirement, the low threshold value of digital signal is lower, and is general for performance requirement, and the low threshold value of digital signal is higher.
The present invention will be further described below in conjunction with other embodiment of the present invention.
With reference to figure 5, show the synoptic diagram of another embodiment of drive circuit unit shown in Figure 2.Present embodiment is that with the different of embodiment shown in Figure 2 in the present embodiment, the gain unit 204 in the drive circuit unit is used for the discrete analog signal that fingerprint sensor 100 detects is amplified; Compensating unit 205 is used to the reference potential of the discrete analog signal that reduces to amplify; Sample-and-hold circuit 202 is used to gather the instantaneous voltage through the discrete analog signal after gain unit 204 and compensating unit 205 processing, and keeps described instantaneous voltage constant in follow-up analog-digital conversion process, forms the continuous analog signal.
With reference to figure 6, show the synoptic diagram of another embodiment of fingerprint recognition system of the present invention.Present embodiment and different being embodiment illustrated in fig. 2, drive circuit unit comprises: controller 201, sample-and-hold circuit 202, AD conversion unit 206, full scale voltage-regulation unit 203 and compensating unit 205.
Present embodiment is applicable to that the discrete analog signal that fingerprint sensor detects is bigger, the maximal value that can satisfy simulating signal by full scale voltage-regulation unit is equal to or slightly less than the condition of full scale voltage, and this moment, drive circuit unit need not to be provided with gain unit again.
With reference to figure 7, show the synoptic diagram of another embodiment of fingerprint recognition system of the present invention.Embodiment is that with the different of embodiment shown in Figure 2 drive circuit unit comprises: controller 201, sample-and-hold circuit 202, AD conversion unit 206 and full scale voltage-regulation unit 203.
Present embodiment is applicable to that the discrete analog signal that fingerprint sensor detects is bigger, can realize that by full scale voltage-regulation unit the maximal value of continuous analog signal is equal to or slightly less than the condition of full scale voltage, and the situation that the reference potential of described continuous analog signal is lower, this moment, drive circuit unit need not to be provided with gain unit and compensating unit again.
To sum up, in the fingerprint recognition system provided by the invention, comprise full scale voltage-regulation unit, full scale voltage can be regulated according to the maximum input voltage of AD conversion unit in described full scale voltage-regulation unit, to obtain high-resolution digital signal, the finger print information that fingerprint recognition system is detected reflects user's fingerprint pattern more realistically, thereby has improved the performance of fingerprint recognition system.
Because full scale voltage-regulation unit has enlarged the scope of AD conversion unit input voltage, fingerprint sensor detects signal in the scope of AD conversion unit input voltage.After perhaps the simulating signal of fingerprint sensor detection is amplified by gain unit, be positioned at the scope of AD conversion unit input voltage, thereby the fingerprint sensor that prior art is scrapped because of signal is less, adjustment by drive circuit unit can obtain the fingerprint recognition system of designing requirement of loading, thereby has improved yield.
In addition, fingerprint recognition system in use, because senile cause, the simulating signal that fingerprint sensor detects can reduce, the full scale voltage-regulation unit of fingerprint recognition system provided by the invention can be by regulating full scale voltage, make the simulating signal that reduces still be positioned at the AD conversion unit input voltage range, the simulating signal that perhaps reduces is positioned at the AD conversion unit input voltage range after amplifying through gain unit, thereby has increased the life-span of fingerprint recognition system.
Should be appreciated that example herein and embodiment only are exemplary, those skilled in the art can make various modifications and corrigendum under the situation of the spirit and scope of the present invention that do not deviate from the application and claims and limited.
Claims (12)
1. a fingerprint recognition system is characterized in that, described fingerprint recognition system comprises:
Fingerprint sensor is used to survey fingerprint pattern, and converts described fingerprint pattern to about finger print information discrete analog signal;
Drive circuit unit, the discrete analog signal that is used for fingerprint sensor is detected carries out data processing, and described drive circuit unit comprises:
Controller is used to drive described fingerprint sensor;
Sample-and-hold circuit is used to gather and keep the instantaneous voltage of discrete analog signal, forms the continuous analog signal;
AD conversion unit, being used for the continuous analog conversion of signals is digital signal;
Full scale voltage-regulation unit is used to regulate the full scale voltage of AD conversion unit, and described full scale voltage is that AD conversion unit is carried out analog-to-digital maximum input voltage.
2. fingerprint recognition system as claimed in claim 1 is characterized in that, full scale voltage-regulation unit comprises first register and regulator, wherein,
First register is used to be provided with many group reference voltages and the full scale voltage corresponding with described reference voltage, and described reference voltage comprises first reference voltage and second reference voltage;
Regulator is used for according to regulating command, selects first reference voltage and second reference voltage from first register, and in AD conversion unit selected first reference voltage and second reference voltage is set;
AD conversion unit obtains corresponding full scale voltage based on described first reference voltage and second reference voltage.
3. fingerprint recognition system as claimed in claim 1 is characterized in that, full scale voltage is 1～1.1 times of continuous analog signal maximum voltage.
4. fingerprint recognition system as claimed in claim 2 is characterized in that, also comprises compensating unit, is used for according to bias order, before analog to digital conversion, makes the reference potential generation potential shift of simulating signal, reduces described reference potential.
5. fingerprint recognition system as claimed in claim 4, it is characterized in that, described compensating unit comprises second register and deviator, described second register is used to be provided with many group offset voltage value, described deviator is used for according to bias order, make the reference potential of simulating signal reduce a side-play amount, described side-play amount is the offset voltage value in second register.
6. fingerprint recognition system as claimed in claim 4 is characterized in that, described reference potential is less than 0.1 times of full scale voltage.
7. fingerprint recognition system as claimed in claim 4 is characterized in that, also comprises gain unit, is used for simulating signal being amplified before analog to digital conversion according to gain command, increases the voltage of simulating signal.
8. fingerprint recognition system as claimed in claim 7 is characterized in that gain unit comprises the 3rd register and amplifier, and described the 3rd register is used to be provided with many group gain multiples; Described amplifier is used for the gain multiple according to the 3rd register, increases the voltage of simulating signal.
9. as claim 4,5,7 or 8 any described fingerprint recognition systems of claim, it is characterized in that described simulating signal is the discrete analog signal about finger print information that sample-and-hold circuit processing formed continuous analog signal in back or fingerprint sensor detect.
10. proving installation that comprises the described fingerprint recognition system of claim 1, wherein, described proving installation also comprises measuring appliance and determining device;
Described measuring appliance is used to measure the digital signal of AD conversion unit output, and measurement result is sent to determining device;
Described determining device, be used to judge that whether the digital signal maximal value of described measuring appliance measurement is more than or equal to the digital signal high threshold, when described digital signal maximal value during less than the digital signal high threshold, the regulator to full scale voltage-regulation unit sends regulating command.
11. a proving installation that comprises the described fingerprint recognition system of claim 5, wherein, described proving installation also comprises measuring appliance and determining device;
Described measuring appliance is used to measure the digital signal of AD conversion unit output, and measurement result is sent to determining device;
Described determining device, be used to judge that whether the digital signal maximal value of described measuring appliance measurement is more than or equal to the digital signal high threshold, when described digital signal maximal value during less than the digital signal high threshold, the regulator to full scale voltage-regulation unit sends regulating command;
Described determining device is used to also to judge whether the digital signal minimum value that described measuring appliance is measured is less than or equal to the low threshold value of digital signal, when described digital signal minimum value during greater than the low threshold value of digital signal, sends bias order to the deviator of compensating unit.
12. a proving installation that comprises the described fingerprint recognition system of claim 7, wherein, described proving installation also comprises measuring appliance and determining device;
Described measuring appliance is used to measure the digital signal of AD conversion unit output, and measurement result is sent to determining device;
Described determining device, be used to judge that whether the digital signal maximal value of described measuring appliance measurement is more than or equal to the digital signal high threshold, when described digital signal maximal value during less than the digital signal high threshold, the regulator to full scale voltage-regulation unit sends regulating command;
Described determining device is used to also to judge whether the digital signal minimum value that described measuring appliance is measured is less than or equal to the low threshold value of digital signal, when described digital signal minimum value during greater than the low threshold value of digital signal, sends bias order to the deviator of compensating unit;
Described determining device, also be used for when analog to digital converter is exported the digital signal maximal value less than the digital signal high threshold, judge that whether first reference voltage of regulator setting and second reference voltage are the minimum value of first reference voltage and second reference voltage in first register, if minimum value is then sent gain command to the amplification phase.
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