Single-capacitor correlated dual-sampling uncooled infrared reading circuit

Abstract

Disclosed in the invention is a single-capacitor correlated dual-sampling uncooled infrared reading circuit comprising a M*N pixel detection unit array, a CTIA type integral circuit, a single-capacitor correlated dual-sampling circuit, an array logic control signal generation module and an output buffer circuit. The M*N pixel detection unit array carries out photovoltaic conversion on a collected signal and inputs the converted signal to the CTIA type integral circuit for current integration; and the single-capacitor correlated dual-sampling circuit carries out sampling holding on the output terminal voltage of the CTIA type integral circuit to generate a signal voltage, and the signal voltage is outputted in a serial mode by the output buffer circuit. The single-capacitor correlated dual-sampling circuit includes a sampling capacitor and a voltage follower circuit; the input terminal and the output terminal of the voltage follower circuit are respectively provided with NMOS tubes to form a sampling capacitor reset switch. Therefore, the subtraction process of twice sampling can be realized only by one sampling capacitor; and the domain area occupied by the infrared reading circuit can be reduced, thereby reducing the circuit power consumption. The provided circuit has the wide application prospects.

Description

technical field [0001] The invention relates to the fields of optoelectronic technology and microelectronic technology, in particular to a single-capacitance correlation double-sampling uncooled infrared readout circuit. Background technique [0002] Infrared imaging technology has been widely used in military, space technology, medicine and national economy related fields. The infrared focal plane array component is the core optoelectronic device for obtaining infrared image signals in infrared imaging technology. The assembly 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 into a single semiconductor chip. Its basic function is to convert, amplify, and multiplex transmission of infrared detector signals, that is, to transfer data from many detector unit arrays to sequentially transferred to the output. Each pixel unit of the ROIC has a s...

AI Technical Summary

Problems solved by technology

Although the traditional CDS structure above can achieve the functions of sampling, holding and eliminating noise in the readout circuit, it is not difficult to see that there are two sampling capacitors in this circuit structure, which will greatly occupy the circuit area and increase power consumption. , for the readout circuit structure with relatively high area requirements, the problem of excessive layout area using this CDS structure needs to be solved

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