Linearity high dynamic range infrared reading circuit

Abstract

The invention relates to a linearity high dynamic range infrared reading circuit which comprises a unit circuit, a column readout stage, an output buffer stage, a time sequence generating circuit, a line option circuit and a row option circuit. The linearity high dynamic range infrared reading circuit is characterized in that the unit circuit includes an integral control unit used for controllingintegral time of the unit circuit, a reset control unit used for controlling integral capacity restoration in the unit circuit, an integral capacity optional unit used for selecting the integral capacity of the unit circuit, an optional integral capacity control signal generating unit and a transmission unit. In the integral process, the invention can automatically select the integral capacity, so that smaller integral capacity is adopted under the condition of less photocurrent, and larger integral capacity is adopted under the condition of more photocurrent. Therefore, the invention can reduce noise equivalent charge when the photocurrent is zero and increase the maximum charge storage capacity of the reading circuit, thus improving the dynamic range on the whole.

Description

technical field [0001] The invention relates to a readout circuit in an infrared imaging system, in particular to a linear high dynamic range infrared readout circuit, which belongs to the technical field of microelectronics and optoelectronics. Background technique [0002] Infrared imaging technology is being increasingly widely used in military, space technology, medicine and related fields of national economy. The infrared focal plane array component is the core optoelectronic device for obtaining infrared image signals in infrared imaging technology. The component consists of an infrared detector and an infrared focal plane readout circuit (ROIC: readout integrated circuits). The basic function of the ROIC circuit is to convert, amplify and transmit the infrared detector signal. Common ROIC circuits include unit circuits, column readout stages and output buffer stages, timing generation circuits, row selection circuits, and column selection circuits. The unit circuit...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of insufficient dynamic range of unit circuits in existing infrared readout circuits, and provide a linear high dynamic range infrared readout circuit, which is suitable for large-scale detector arrays and has integral Capacitor automatic selection control function, large dynamic range and ROIC unit structure that can maintain linearity

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