| 摘要: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AD7543 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12 位数据和控制信号的的传输功能. |
| 关键词: 高增益前置运放 失调漂移补偿 串行D/ A 转换 微弱信号检测 |
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| Novel Real2time Compensation Technology for theOffset and Drift of the High2gain Preamplifier |
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| Abstract:For the high2gain preamplifier , the offset and drift that influence the stability of an entire circuit is obvious.
According to the demand of a feeble2signal measure system , a real2time compensation system for the offset and drift was
developed. It is composed of a 122bit serial2imported A/ D transfer AD7543 and a monostable trigger2action circuit built
up by 4 Schmidt triggers as demoder. This circuit has a novel construction that 122bit 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. |
| Key words: high2gain preamplifier compensation for the offset and drift serial2imported A/ D transfer feeble2signal
measure |