TDI CCD output signal preprocessor

Abstract

The invention belongs to the field of signal processing, and discloses a TDI CCD output signal preprocessor. A signal low-pass filtering circuit, an optical coupling isolation amplifying circuit, a reset noise filtering circuit, a potential regulation amplification and bidirectional amplitude-limiting circuit, a timing generation circuit and a direct current supplying circuit are integrated on a circuit board, and therefore the integration of a TDI CCD signal processing circuit is achieved. The optical coupling isolation amplifying circuit is adopted by the TDI CCD output signal preprocessor, the impedance matching problem between a TDI CCD and a processing circuit is solved, and the interstage common-mode interference is eliminated. The TDI CCD output signal preprocessor is simple to operate, capable of converting an output signal of the TDI CCD into a signal only including pixel signal amplitude information simply by being connected with external 220V and 50Hz alternating current, and universally suitable for output signals, within the range of 1MHz to 4MHz, of the TDI CCD.

Description

technical field [0001] The invention belongs to the field of signal processing, and relates to a signal preprocessor, in particular to a TDI CCD (Time Delay Integration Charge Coupled Devices, Time Delay Integration Charge Coupled Devices) output signal preprocessor. Background technique [0002] TDI CCD is a new type of linear array photoelectric sensor, which exposes the same target multiple times through the method of time delay integration to increase the photon energy collection of the target. Compared with CMOS (Complementary Metal Oxide Semiconductor, Complementary Metal Oxide Semiconductor) image sensors, TDI CCD can obtain high sensitivity without sacrificing spatial resolution and working speed, and obtain high-quality images through time-delay integration in low illumination The advantages of image information, and TDI CCD has the advantages of good color saturation, sharper images and more realistic texture, especially in low-light environments, high-quality imag...

AI Technical Summary

Problems solved by technology

However, the existing processing circuit only realizes part of the single denoising function, and the existing TDI CCD types are various, the output signal frequency is not the same, and the processing requirements are also different. The matching performance of the subsequent processing circuit and the previous circuit more demanding

In addition, the application of effective view signals after signal processing is also different. For example, the methods of analog-to-digital conversion of effective signals for upper computer picture display are also different, and effective connection and matching cannot be achieved.

These make it difficult to integrate the TDI CCD signal processing circuit

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