An infrared focal plane readout circuit

Abstract

The invention discloses an infrared focal plane readout circuit. The readout circuit includes a unit bias circuit, an integration circuit and an on-chip analog-to-digital conversion circuit, the integration circuit includes a first switch tube, a second switch tube and an integration capacitor, the output terminal of the unit bias circuit and the input terminal of the first switch tube connected, the input terminal of the second switching tube is connected to the setting terminal, the output terminal of the first switching tube and the output terminal of the second switching tube are both connected to one end of the switched capacitor and the input terminal of the on-chip analog-to-digital conversion circuit, and the switched capacitor The other end is grounded, and the on-chip analog-to-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. The integration circuit of the readout circuit avoids the setting of an operational amplifier, and the circuit structure is simple. When processing large-scale array data, the power consumption of the entire readout circuit can be greatly reduced. In addition, three inverters are used instead of analog comparators. It is also possible to further reduce the power consumption of the entire readout circuit.

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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