Infrared focal plane reading circuit

Abstract

The invention discloses an infrared focal plane reading circuit. The reading circuit includes a unit bias circuit, an integral circuit and an on-chip analog-digital conversion circuit. The integral circuit includes a first switch tube, a second switch tube and an integral capacitor. The output terminal of the unit bias circuit is connected with the input terminal of the first switch tube. The input terminal of the second switch tube is connected with a setting terminal. The output terminal of the first switch tube and the output terminal of the second switch tube are both connected with one end of a switch capacitor and the input terminal of the on-chip analog-digital conversion circuit. The other terminal of the switch capacitor is in grounded connection. The on-chip analog-digital conversion circuit includes a first inverter, a second inverter, a third inverter, an exclusive-OR gate, a built-in sequence counter and a register. According to the invention, an operation amplifier is saved in the integral circuit of the reading circuit, so that the circuit structure is simple and the power consumption of the whole reading circuit can be reduced substantially during a process of processing large scale array data. Besides, the three inverters are utilized for replacing a simulation comparator and the power consumption of the whole reading circuit is reduced further.

Description

technical field [0001] The invention relates to the technical field of infrared imaging, in particular to an infrared focal plane readout circuit. Background technique [0002] The infrared focal plane array is the core optoelectronic device for obtaining infrared image signals in infrared imaging technology. The infrared focal plane array is composed of an infrared detector and an infrared focal plane readout circuit (ROIC: readout integrated circuits). Today, the uncooled infrared focal plane array is one of the fastest growing arrays, and the power consumption of the uncooled infrared focal plane array depends almost entirely on its readout circuitry. Therefore, with the continuous expansion of the scale of the infrared focal plane array, the infrared focal plane readout circuit with low power consumption becomes more and more important. [0003] Currently, due to the need for high precision and high speed processing, uncooled infrared focal plane arrays usually replace ...

AI Technical Summary

Problems solved by technology

The integrating circuit in the existing infrared focal plane readout circuit usually includes devices such as operational amplifiers, resistors and capacitors, and an analog comparator is usually set in the comparison circuit, and the setting of the operational amplifier and the analog comparator not only makes the circuit structure complicated, but also As a result, the power consumption of the infrared focal plane readout circuit increases sharply when processing large-scale array data

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