Low-noise CCD camera circuit

Abstract

The invention discloses a low-noise CCD camera circuit. The low-noise CCD camera circuit comprises a bandwidth-adjustable analog front end circuit and a CCD camera digital sampling circuit based on a CDS technology; the analog front end circuit comprises a blocking capacitor C, a pre-stage in-phase amplification circuit QF and a bandwidth-adjustable RC low-pass filter switch KG; the pre-stage amplification circuit QF comprises an operational amplifier U, a resistor R connected with an in-phase input end of the operational amplifier, resistors R1 and R2 connected with a reverse input end of the operational amplifier U, and a Schottky diode D connected with the resistor R2 and the reverse input end of the operational amplifier U in parallel; a resistor RS1 and a resistor RS2 are connected with an output end of the operational amplifier U; and a switch Ks and a capacitor Cs form a bandwidth-adjustable switch KG. The invention provides the low-noise CCD camera circuit which has small volume, light weight and low power consumption, high anti-jamming capability, high safety and reliability, flexible design and high expansion capability, can effectively reduce noise and improves a dynamic range of a CCD camera.

Description

technical field [0001] The invention belongs to the field of optoelectronics, and relates to a method and system for realizing a low-noise CCD camera circuit, in particular to a CCD remote-sensing camera circuit aimed at the fields of astronomical observation and deep-space detection with low-noise requirements. Background technique [0002] Because CCD has the characteristics of high quantum efficiency, good linearity and low noise, it has been widely used in aerospace and other fields, especially in low-illumination, low-light target astronomical observation and other fields. However, noise has become the main obstacle to the completion of weak light observation tasks. With the continuous development of CCD devices towards miniaturization and integration, the increase in the number of CCD photosensitive elements will inevitably reduce the area of ​​photosensitive elements, thereby reducing the output saturation signal of CCD. . In order to expand the dynamic range of the ...

AI Technical Summary

Problems solved by technology

However, noise has become the main obstacle to the completion of low-light observation tasks. With the continuous development of CCD devices towards miniaturization and integration, the increase in the number of CCD photosensitive elements will inevitably reduce the area of ​​photosensitive elements, thereby reducing the output saturation signal of CCD.

In order to expand the dynamic range of the CCD, it is necessary to reduce the noise of the CCD camera, otherwise it cannot be applied to astronomical observation tasks of high-precision, low-light targets

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