公开(公告)号：US5861775A

公开(公告)日：1999-01-19

申请号：US784696

申请日：1997-01-16

Applicant: Chingchi Chen ,  Venkateswara Anand Sankaran

Inventor： Chingchi Chen ,  Venkateswara Anand Sankaran

IPC: H03F3/45 ,  G05F1/00

CPC classification number: H03F3/45968 ,  H03F3/45475 ,  H03F2200/331

Abstract: A cost-effective conditioning circuit for extracting a weak, floating, wide-band signal with a low common-mode voltage from noisy environments is proposed that includes a high gain single ended operational amplifier to increase the amplitude of the signal. A simple, cost-effective approximately unity gain differential amplifier stage is used to level-shift the signal down to the desired reference potential. A typical application is a motor drive system, where the signals to be measured are bi-directional motor currents.

Abstract translation: 提出了一种经济高效的调理电路，用于从嘈杂环境中提取具有低共模电压的弱，浮动宽带信号，其包括高增益单端运算放大器，以增加信号的幅度。 使用简单的，具有成本效益的近似单位增​​益差分放大器级将信号电平移位到期望的参考电位。 典型的应用是电机驱动系统，其中要测量的信号是双向电动机电流。