Feedback isolation amplifier
US5187446A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 10, 1992 |
| Grant date | Feb 16, 1993 |
| Priority date | — |
| Expiry date | Jun 10, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/347
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An isolation amplifier employs feedback to accurately amplify an input signal while maintaining electrical isolation between the input and output signals. The isolation amplifier consists of an amplitude modulator, an isolation transformer having a pair of matched secondary windings, a peak-detector output circuit, and a matching peak-detector feedback circuit. The isolation transformer couples an amplitude-modulated signal to both peak detector circuits while maintaining electrical isolation. The output from the feedback circuit is fed back to the amplitude modulator, so that the amplitude-modulated signal represents the difference between the input to the amplifier and the feedback signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.