一种高增益前置运放失调漂移的实时补偿

Novel Real-time Compensation Technology for the Offset and Drift of the High-gain Preamplifier

高增益前置运放的失调漂移是影响电路稳定性的一个重要因素 ,本文针对实际微弱信号测量系统的要求 ,提出并设计了以 12位串行数据输入D/A转换器AD75 43芯片和 4个由施密特触发器组成的单稳态触发器作为解码电路构成的运放失调漂移的实时补偿电路 ,介绍了电路结构、串行数据的格式、工作时序等 .该电路构思新颖 ,只通过一根信号线就能完成

For the high-gain preamplifier, the offset and drift that influence the stability of an entire circuit is obvious. According to the demand of a feeble-signal measure system, a real-time compensation system for the offset and drift was developed. It is composed of a 12-bit serial-imported A/D transfer AD7543 and a monostable trigger-action circuit built up by 4 Schmidt triggers as demoder. This circuit has a novel construction that 12-bit data and control signal can transfer serially through one wire. The construction of circuit, the format of serial and the time sequence are introduced here.