Fully-differential infrared focal plane array readout circuit
An infrared focal plane and readout circuit technology, which is applied in the field of image sensors, can solve the problems of reducing the fill factor of image sensors, etc., and achieve the effects of reducing the volume of the whole machine, reducing the circuit area, and reducing costs
Pending Publication Date: 2017-10-20
XINFOO SENSOR TECH CO LTD
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Problems solved by technology
The problems existing in the prior art are: 1) Using a single-ended output amplifier, the signal output at the output end is a pseudo-differential signal, and an additional circuit is required to convert the pseudo-differential signal into a fully differential signal, and the existence of the conversion circuit greatly affects the Reduces the fill factor of the image sensor; 2) In addition, in the existing correlated double sampling circuit, the offset of the operational amplifier itself will also introduce fixed noise FPN in the image sensor
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[0027] Combine below Figure 1 to Figure 7 , the embodiments of the present invention are described in detail.
[0028] see figure 1 , a fully differential infrared focal plane array readout circuit, comprising:
[0029] Pixel array, used to collect infrared light signal, photoelectric conversion and output line by line;
[0030] A fully differential correlated double sampling circuit, connected to the pixel array, is used to integrate and double sample the signals collected by the pixel array circuit and output the actual differential signal;
[0031] The output buffer circuit is connected to the fully differential correlated double sampling circuit, which is used to buffer and output the actual differential signal column by column;
[0032] and a row and column logic control signal generating circuit, respectively providing row selection control signal and column selection control signal for the pixel array and the output buffer circuit.
[0033] Specifically, see figu...
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The invention discloses a fully differential infrared focal plane array readout circuit, comprising: a pixel array used to collect infrared light signals, photoelectrically convert and output row by row; a fully differential correlated double sampling circuit connected to the pixel array for The signals collected by the pixel array circuit are integrated, double-sampled and output the actual differential signal; the output buffer circuit is connected to the full-differential correlation double-sampling circuit for buffering and outputting the actual differential signal column by column; and the row-column logic control signal generation circuit, A row selection control signal and a column selection control signal are respectively provided for the pixel array and the output buffer circuit. The present invention uses a CDS circuit with full differential configuration of switched capacitors, which can realize integration and double sampling functions and output actual differential signals without additional configuration of differential conversion circuits, which can significantly reduce the circuit area and increase the fill factor; at the same time, the circuit introduces The compensation capacitor can provide offset compensation to eliminate the influence of the operational amplifier bias voltage on the sampling result.
Description
technical field [0001] The invention belongs to the technical field of image sensors, in particular to a fully differential infrared focal plane array readout circuit. Background technique [0002] Infrared thermal imaging sensors are now widely used in security, fire protection, medical, industrial, automotive, special industries and other fields. The infrared focal plane array component is the core optoelectronic device for acquiring infrared image signals in infrared imaging technology. The component consists of an infrared detector and an infrared readout circuit (ROIC). [0003] The ROIC circuit is a highly integrated circuit that integrates various functions of the focal plane in a semiconductor chip. Its basic function is to convert, amplify and multiplex the infrared detector signal. However, the circuit structure devices and circuit operation methods used in the ROIC circuit will introduce noise, such as reset noise and fixed noise FPN. The introduction and superp...
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Login to View More IPC IPC(8): G01J5/10G01J5/24
CPCG01J5/10G01J5/24G01J2005/202
Inventor 赵照
Owner XINFOO SENSOR TECH CO LTD