摘要
在高准确度的交流参数测量中,对数-反对数放大器通常用来实现交直流真有效值转换器。在设计交直流转换器时,除了关心转换器的线性度和增益的稳定性外,转换器的零点稳定性也是实现高准确度测量的关键技术问题。本文以放大器的失调电压作为误差影响因素,分析放大器失调电压对交流真有效值转换器误差的影响,并给出失调电压影响的表达式。
In AC parameters measurement with high accuracy, as a rule, log and antilog amplifier is used to perform true rms-to-dc conversion. Besides paying attention to the linearity and the gain stability of true rms-to-dc converter, zero stability is a key technology to achieve high accuracy when we design converter. In this paper, the error of true rms-to-dc converter was analyzed under the condition of offset voltage of amplifier as main error, and the offset expressions for affect were given.
出处
《电测与仪表》
北大核心
2009年第7期60-61,80,共3页
Electrical Measurement & Instrumentation
基金
上海市重点学科建设资助项目(J51301)
关键词
真有效值
对数-反对数放大器
失调电压
误差分析
true root-mean-square, log amplifier and antilog amplifier, offset voltage, error analysis voltage
