Bidirectional pyroelectric signal integral reading circuit based on memory resistor bridge circuit

Abstract

The invention discloses a bidirectional pyroelectric signal integral reading circuit based on a memory resistor bridge circuit, and the reading circuit comprises a first-stage CTIA (capacitive feedback mutual conductance) input stage circuit, the memory resistor bridge circuit and a sampling output circuit. The first-stage CTIA input stage circuit enables an output current signal of a relaxor ferroelectric detector to be converted into a voltage signal, and the memory resistor bridge circuit carries out the selection of the output signal. The sampling output circuit carries out the sampling of the signal, and enables all channels to be conducted and outputted one by one. According to the invention, a circuit module is integrated on an integrated circuit chip, and an external drive circuit provides a control signal, thereby improving the signal to noise ratio of the output signal, and providing a high-signal-to-noise-ratio reading circuit for a large-scale multi-element small-size sensitive element pyroelectric focal plane.

Description

technical field [0001] The invention relates to a readout circuit of a pyroelectric detector, in particular to a bidirectional pyroelectric signal integral readout circuit of a pyroelectric detector. Background technique [0002] In recent years, infrared detection technology has developed rapidly, and pyroelectric infrared focal plane arrays have attracted much attention in infrared focal plane arrays because of their advantages such as uncooling, low power consumption, and wide spectrum. However, since the detection signal of the infrared device depends on the area of ​​the sensitive element, as the resolution of the focal plane detection device increases, the surface element becomes smaller and smaller, and the pyroelectric current becomes weaker and weaker, which limits the detection technology of this type of device. The key to the application. [0003] Different from photoelectric detectors, the generation of pyroelectric current is due to the change of material cryst...

AI Technical Summary

Problems solved by technology

Therefore, in the pyroelectric focal plane detector, it will generate two opposite positive and negative half-period signals within one modulation cycle. The traditional pyroelectric focal plane weak signal readout circuit only works when the current is forward or reverse The time-to-time and readout circuit is turned on, which is similar to the working mode of the photodetector. It is a unidirectional current integral readout, which reduces the circuit signal-to-noise ratio and readout efficiency.

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