Design of very low noise amplifier for high accuracy star tracker in GEO missions

2013 International Conference on Advanced Electronic Systems (ICAES) Pub Date : 2013-11-11 DOI:10.1109/ICAES.2013.6659366

M. G. Lithin, G. K. Kashyap, B. Sudha, S. Majumder, B. K. Prasad, T. H. Shashikala, G. N. Rao

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引用次数: 3

Abstract

The SNR of the amplifier plays a vital role in achieving the lower volume and mass of a High Accuracy Star Tracker. Poorer SNR can be compensated by larger aperture Optics or by large integration time. Having a larger Optics impose penalty on the overall weight and volume whereas, the large integration time makes system response slower. This calls for the design of low noise amplifier. This paper is about the novel design of a very high performance amplifier for CCD signal readout in High Accuracy Star Tracker application. Unlike the imagers, the Star Tracker has to detect very low intensity star's positions accurately in the field of view. Hence the video-amplifier has to provide low noise floor, in order to achieve high Signal to Noise ratio (SNR). This paper presents a two-stage video amplifier with DC-restoration and fine offset correction dynamically. The amplifier provides a low noise performance of 6e- with a gain of 23 and consumes only of 0.5W power. All the components are selected critically so that the amplifier can be used in both LEO as well as GEO radiation environments.

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GEO高精度星跟踪器极低噪声放大器的设计

放大器的信噪比对实现高精度星跟踪器的低体积、低质量起着至关重要的作用。较差的信噪比可以通过较大孔径光学器件或较大积分时间来补偿。较大的光学元件会对整体重量和体积造成不利影响，而较大的集成时间会使系统响应变慢。这就要求设计低噪声放大器。本文设计了一种用于高精度星跟踪器中CCD信号读出的高性能放大器。与成像仪不同，星跟踪器必须在视场中准确地探测到非常低强度的恒星位置。因此，视频放大器必须提供低本底噪声，以实现高信噪比。本文提出了一种具有直流恢复和动态精细偏移校正功能的两级视频放大器。该放大器具有6e-的低噪声性能，增益为23，功耗仅为0.5W。所有的组件都经过严格的选择，使放大器可以在LEO和GEO辐射环境中使用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2013 International Conference on Advanced Electronic Systems (ICAES)

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