Signal conditioning circuit for low amplitude, high common mode voltage input signals
US5861775A · kind A · utility
10Cited by
11References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 16, 1997 |
| Grant date | Jan 19, 1999 |
| Priority date | — |
| Expiry date | Jan 16, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/331
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.