Transmission circuit of digital output signals in infrared focal plane array reading circuit

Abstract

The invention discloses a transmission circuit of digital output signals in an infrared focal plane array reading circuit. The transmission circuit of the digital output signals in the infrared focal plane array reading circuit comprises a digital output signal collecting circuit and a current comparator circuit. The digital output signal collecting circuit comprises n digital output signal collecting units, and each digital output signal collecting unit converts collected digital signals into analog signals and outputs the analog signals. The current comparator circuit is used for converting the analog signals input by the digital output signal collecting units into the digital signals and outputting the digital signals. According to the transmission circuit of the digital output signals in the infrared focal plane array reading circuit, the digital output signal collecting units convert the collected digital signals into the analog signals and transmit the analog signals, the analog signals are current signals, relative to voltage signals, disturbing influence on the current signals from the external in the process of transmitting is small, after transmission is finished, when output is needed, the current comparator circuit converts the analog signals into the digital signals, and therefore external disturbance on the signals in the process of transmitting can be reduced.

Description

Technical field [0001] The invention relates to a readout circuit of an infrared focal plane array detector, in particular to a digital output signal transmission circuit in an infrared focal plane array readout circuit. Background technique [0002] According to Planck's radiation theorem, any object whose temperature is higher than absolute zero will have molecular thermal motion inside it, which will produce infrared radiation of varying wavelengths. Infrared radiation has important characteristics that its intensity and wavelength are directly related to the surface temperature of an object, providing a wealth of information about the object. But infrared radiation is an invisible electromagnetic wave. When infrared radiation is used to obtain information about an object, it is necessary to convert this infrared radiation into a measurable signal. [0003] An infrared focal plane array detector is a device that converts infrared radiation into a measurable signal. The infrare...

AI Technical Summary

Problems solved by technology

[0007] In the traditional digital output signal transmission circuit, the digital level is directly transmitted, and the voltage signal has a certain loss during the transmission process, which may cause false output

In addition, the acquisition circuit of the digital output signal will use NMOS transistors and PMOS transistors, and the PMOS transistors often occupy a large chip area. At the same time, when converting the value of the output signal, the circuit structure used is complex, high power consumption, and large noise.

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