CN104266763A - Reading circuit of infrared focal plane array detector and control method thereof - Google Patents
Reading circuit of infrared focal plane array detector and control method thereof Download PDFInfo
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- CN104266763A CN104266763A CN201410485254.7A CN201410485254A CN104266763A CN 104266763 A CN104266763 A CN 104266763A CN 201410485254 A CN201410485254 A CN 201410485254A CN 104266763 A CN104266763 A CN 104266763A
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Abstract
The embodiment of the invention discloses a reading circuit of an infrared focal plane array detector and a control method of the reading circuit. The reading circuit comprises a row selection circuit and a flow line analog-digital converter, wherein a row selection enable signal input end of the row selection circuit is connected to a calibration activating signal input end of the flow line analog-digital converter. When a row selection enable signal is input, the row selection enable signal is also input into the calibration activating signal input end, and a calibration module inside the flow line analog-digital converter is started to conduct calibration. According to the reading circuit of the infrared focal plane array detector and the control method of the reading circuit, the row selection enable signal serves as a calibration activating signal, so that foreground calibration is changed into pseudo-background calibration. When the uncooled infrared focal plane reading circuit is applied on a large scale, the control mode can realize real-time data calibration in the use process compared with a traditional foreground calibration mode, and can increase the resource utilization rate of the reading circuit compared with a background calibration mode.
Description
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Technical field
The present invention relates to infrared focal plane array seeker technical field, especially relate to a kind of sensing circuit and control method thereof of infrared focal plane array seeker.
Background technology
In the sensing circuit of infrared focal plane array seeker, the method for self calibration production line analog-digital converter wherein (Pipeline ADC) generally includes digital foreground method for self-calibrating and digital backstage method for self-calibrating.
Numeral foreground method for self-calibrating be by one accurately ramp signal as input signal the error of ADC to be extracted and to be stored on sheet in internal memory in a digital manner, under ADC works in normal state, its error is fallen according to certain algorithm compensation in digital reconstruction process at digital output end.
Numeral backstage method for self-calibrating utilizes the error of Pipeline ADC every grade to be extracted with the pseudo random signal of signal correction, and pseudo random signal adds 1 or subtract 1 and carry out the generation of control inputs to overflow problem during ADC by the size of input signal, make it to produce nonlinearity erron because ADC overflows, this error can not be calibrated thus have impact on the precision of ADC.Some prior art employs pseudo random signal by a small margin, and input signal does not reach the full amplitude of oscillation to ensure the overflow problem of ADC, but not easily restrains due to pseudo random signal by a small margin, therefore it needs longer convergence time.This situation is unallowed to some application.
Numeral backstage method for self-calibrating the error of ADC is extracted with certain algorithm, and in the process of digital output end reconstruction by the process of these error concealments.Numeral backstage self-calibration technique itself does not need calibration source accurately, and along with the sample rate of modern ADC is more and more faster and CMOS technology size is more and more less, makes to calibrate required time shorter and shorter.This technology is adopted widely in modern ADC design.
But the Foreground calibration mode of the pipeline ADC of traditional infrared focal plane read-out circuit, can not real time calibration data, and backstage calibrating mode needs to utilize a lot of resources of chip.The calibration of control pipeline ADC is gone, existing defects in engineer applied by the control mode of traditional infrared focal plane read-out circuit, as: resource utilization is low, can not real time calibration data.
Summary of the invention
An object of the present invention is to provide and a kind ofly can effectively improves sensing circuit resource utilization and can the sensing circuit of infrared focal plane array seeker of real time calibration data and control method thereof.
Technical scheme disclosed by the invention comprises:
Provide a kind of sensing circuit of infrared focal plane array seeker, it is characterized in that, comprise: row selects circuit, described row selects circuit to be connected on the row of infrared focal plane array seeker, for selecting the row of described infrared focal plane array seeker, described row selects circuit to comprise row and selects enable signal input end; Production line analog-digital converter, described production line analog-digital converter is connected to described infrared focal plane array seeker, signal for being exported by described infrared focal plane array seeker converts digital signal to, and described production line analog-digital converter comprises calibration activation information input end; Wherein said row selects enable signal input end to be connected to described calibration activation information input end, when selecting enable signal input end line of input to select enable signal from described row, described row selects enable signal also to input described calibration activation information input end and the calibration module started in described production line analog-digital converter is calibrated.
In embodiments of the invention, additionally provide a kind of control method of sensing circuit of aforesaid infrared focal plane array seeker, it is characterized in that, comprising: receive row and select enable signal; Selected by described row enable signal to be input to the calibration activation information input end of production line analog-digital converter, calibrate with the calibration module that described row selects enable signal to start in described production line analog-digital converter.
In embodiments of the invention, select enable signal as calibration activation information with row, owing to have employed the pipeline ADC control mode from Foreground calibration, therefore make Foreground calibration become pseudo-background calibration.In the application of extensive non-refrigerating infrared focal plane sensing circuit, this control mode, can in use real time calibration data relative to traditional Foreground calibration mode, relative to background calibration mode, can improve the resource utilization of sensing circuit.
Accompanying drawing explanation
Fig. 1 is the infrared focal plane array seeker of one embodiment of the invention and the schematic diagram of sensing circuit thereof.
Embodiment
Sensing circuit and the control method thereof of the infrared focal plane array seeker of embodiments of the invention is described in detail below in conjunction with accompanying drawing.
As shown in Figure 1, in one embodiment of the present of invention, the sensing circuit of infrared focal plane array seeker 10 comprises row and selects circuit 20 and production line analog-digital converter 30.
Row selects circuit 20 to be connected on the row of infrared focal plane array seeker 10, for selecting signal to choose certain row of infrared focal plane array seeker 10 according to row.This row selects circuit 20 to comprise row and selects enable signal input end row_en.Row selects enable signal enable signal input end row_en can be selected to input from this row.This row selects enable signal to select circuit 20 for enable row, that is, this row selects enable signal to make row select circuit 20 can perform its row and selects function.
Production line analog-digital converter 30 is connected on infrared focal plane array seeker 10, converts digital signal to for the signal exported by infrared focal plane array seeker 10.
Production line analog-digital converter 10 comprises calibration activation information input end Cali_EN.This calibration activation information input end Cali_EN is for inputting calibration activation information, and calibration activation information, for starting the calibration module (not shown) in production line analog-digital converter 10, makes calibration module start to calibrate.That is, when calibration activation information input end have input calibration activation information, the calibration module that this calibration activation information starts in production line analog-digital converter 10 starts to calibrate this production line analog-digital converter 10.
As shown in Figure 1, in one embodiment of the present of invention, row selects the row of circuit 20 to select enable signal input end row_en to be connected to the calibration activation information input end Cali_EN of production line analog-digital converter 30.When selecting enable signal input end row_en line of input to select enable signal from row, this row selects enable signal to be also input to calibration activation information input end Cali_EN simultaneously and the calibration module started in production line analog-digital converter 30 starts to calibrate this production line analog-digital converter 30.That is, in embodiments of the invention, select the row of circuit 20 to select enable signal as the calibration activation information of production line analog-digital converter 30 with row.
Therefore, in one embodiment of the present of invention, the control method of the sensing circuit of the infrared focal plane array seeker in previous embodiment can comprise: receive row and select enable signal, and select enable signal to be input to the calibration activation information input end of production line analog-digital converter row, calibrate with the calibration module that this row selects enable signal to start in this production line analog-digital converter.
In one embodiment of the present of invention, the course of work of the capable n of the m in Fig. 1 row infrared focal plane array seeker can be as follows.
In 0th moment, in the 0th row, the data of all row are at integration, and now, row selects enable signal row_en as the calibration activation information Cali_EN of pipeline ADC internal calibration module, start pipeline ADC and calibrate.
In 1st moment, in the 1st row, the data of all row are at integration, and now, in the 0th row, the data of all row are at A/D.
In 2nd moment, in the 2nd row, the data of all row are at integration, and now, in the 1st row, the data of all row are at A/D.
In 3rd moment, in the 3rd row, the data of all row are at integration, and now, in the 2nd row, the data of all row are at A/D.
By that analogy, in the m-1 moment, during m-1 is capable, the data of all row are at integration, and now, during m-2 is capable, the data of all row are at A/D; In the m moment, during m is capable, the data of all row are at integration, and now, during m-1 is capable, the data of all row are at A/D; In the m+1 moment, integrating circuit does not work, and now, during m is capable, the data of all row are at A/D.
In embodiments of the invention, select enable signal as calibration activation information with row, owing to have employed the pipeline ADC control mode from Foreground calibration, therefore make Foreground calibration become pseudo-background calibration.In the application of extensive non-refrigerating infrared focal plane sensing circuit, this control mode, can in use real time calibration data relative to traditional Foreground calibration mode, relative to background calibration mode, can improve the resource utilization of sensing circuit.
Described the present invention by specific embodiment above, but the present invention is not limited to these specific embodiments.It will be understood by those skilled in the art that and can also make various amendment, equivalent replacement, change etc. to the present invention, as long as these conversion do not deviate from spirit of the present invention, all should within protection scope of the present invention.In addition, " embodiment " described in above many places represents different embodiments, can certainly by its all or part of combination in one embodiment.
Claims (2)
1. a sensing circuit for infrared focal plane array seeker, is characterized in that, comprising:
Row selects circuit, and described row selects circuit to be connected on the row of infrared focal plane array seeker, and for selecting the row of described infrared focal plane array seeker, described row selects circuit to comprise row and selects enable signal input end;
Production line analog-digital converter, described production line analog-digital converter is connected to described infrared focal plane array seeker, signal for being exported by described infrared focal plane array seeker converts digital signal to, and described production line analog-digital converter comprises calibration activation information input end;
Wherein said row selects enable signal input end to be connected to described calibration activation information input end, when selecting enable signal input end line of input to select enable signal from described row, described row selects enable signal also to input described calibration activation information input end and the calibration module started in described production line analog-digital converter is calibrated.
2. a control method for the sensing circuit of infrared focal plane array seeker as claimed in claim 1, is characterized in that, comprising:
Receive row and select enable signal;
Selected by described row enable signal to be input to the calibration activation information input end of production line analog-digital converter, calibrate with the calibration module that described row selects enable signal to start in described production line analog-digital converter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410485254.7A CN104266763B (en) | 2014-09-22 | 2014-09-22 | The reading circuit and its control method of a kind of infrared focal plane array seeker |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410485254.7A CN104266763B (en) | 2014-09-22 | 2014-09-22 | The reading circuit and its control method of a kind of infrared focal plane array seeker |
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| CN104266763A true CN104266763A (en) | 2015-01-07 |
| CN104266763B CN104266763B (en) | 2018-01-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109787605A (en) * | 2018-12-27 | 2019-05-21 | 北京安酷智芯科技有限公司 | A kind of logic circuit |
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| CN102025373A (en) * | 2009-09-16 | 2011-04-20 | 复旦大学 | Digital background calibration circuit |
| CN102252759A (en) * | 2011-03-16 | 2011-11-23 | 中国科学院上海技术物理研究所 | Infrared focal plane readout integrated circuit with digital output |
| CN102261958A (en) * | 2011-07-07 | 2011-11-30 | 清华大学 | Method for reading out high-accuracy signal |
| CN102809436A (en) * | 2012-08-15 | 2012-12-05 | 无锡萌涉传感技术有限公司 | Infrared array focal plane read-out circuit |
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| US6642496B1 (en) * | 2002-01-18 | 2003-11-04 | Raytheon Company | Two dimensional optical shading gain compensation for imaging sensors |
| WO2007015235A1 (en) * | 2005-08-04 | 2007-02-08 | Semi-Conductor Devices-An Elbit Systems-Rafael Partnership | Circuitry for balancing a differential type focal plane array of bolometer based infra-red detectors |
| CN102025373A (en) * | 2009-09-16 | 2011-04-20 | 复旦大学 | Digital background calibration circuit |
| CN102252759A (en) * | 2011-03-16 | 2011-11-23 | 中国科学院上海技术物理研究所 | Infrared focal plane readout integrated circuit with digital output |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109787605A (en) * | 2018-12-27 | 2019-05-21 | 北京安酷智芯科技有限公司 | A kind of logic circuit |
| CN109787605B (en) * | 2018-12-27 | 2023-05-09 | 北京安酷智芯科技有限公司 | Logic circuit |
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| CN104266763B (en) | 2018-01-16 |
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