An automatic gain control amplifier for high voltage spindle recording

Abstract

In this work, an automatic gain control amplifier for high voltage spindle recording is proposed. It is composed of a fix-gain amplifier and a variable gain amplifier (VGA) with threshold detecting logic to control the gain of VGA. The system provides 3 different gain set: 54dB, 60dB and 66dB. The bandwidth of the system covers from 0.5Hz to 1.5 KHz. The power is 7.7uW, and the integral input referred noise is 5.5uV. With the threshold detecting logic, the system can avoid saturation when high voltage spindle happens.