Noise reduction circuit for CCD camera

Abstract

The invention discloses a noise reduction circuit for a CCD camera, and designs a novel plane electromagnetic band gap structure according to the theory of electromagnetic band gap, wherein the novel plane electromagnetic band gap structure is suitable for a high-speed analog-digital mixed circuit. The electromagnetic band gap structure mainly consists of repeated electromagnetic band gap basic units. Each basic unit consists of a bright connection line and a small block. The circuit employs the special connection relation between a metal unit and an electric medium, and forms a local capacitor and inductor resonance unit. The circuit inhibits surface wave propagation nearby a resonant frequency through the resonant effect of a structure unit and a formed high-resistance plane, thereby forming an electromagnetic band gap. The electromagnetic band gap structure is used in a high-speed CCD camera circuit, and achieves the inhibition of the noises of the high-speed CCD camera circuit. The structure achieves the application of the theory of electromagnetic band gap in a project.

Description

technical field [0001] The invention designs a noise reduction circuit for a CCD camera, which is used for suppressing the noise in the CCD camera circuit, and belongs to the technical field of electronic circuits and systems. Background technique [0002] With the development of space optical remote sensing camera electronics towards high speed, high integration and miniaturization, the number of digital integrated circuits in the circuit is increasing, and the scale is also increasing. And the switch conversion when the internal transistor of the integrated circuit is working will inevitably cause the change of the current. As the clock frequency in the circuit increases, the speed of current change becomes faster, which affects the stability of the voltage of the power supply system in the circuit. [0003] At present, the development of space optical remote sensing camera puts forward higher requirements for the design of camera video circuit. For a high-resolution cam...

AI Technical Summary

Problems solved by technology

Since the current push-broom satellite camera must also use CCD devices, the camera video electronics is an analog-digital mixed-signal circuit system. Therefore, when the synchronous switching noise is coupled into the analog signal processing circuit, it will have a great impact on the camera image quality. impact, seriously reducing the signal-to-noise ratio of the system

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