Method and apparatus for measuring an output signal of a floating transducer
US6633441B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 12, 2000 |
| Grant date | Oct 14, 2003 |
| Priority date | — |
| Expiry date | Sep 29, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45676
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A circuit for measuring signal output of a transducer includes an amplifier having a differential input and a single ended output referenced to a fixed potential. One transducer terminal is coupled through a source follower to an input terminal of the differential input and the other transducer terminal is coupled through a source follower and a resistive element to the other input terminal of the differential input whereby the transducer terminals are isolated from the fixed potential. A voltage to current converter converts the voltage at the single ended output to an output current that is applied to an input branch of a current mirror. A first output branch of the current mirror supplies a current equal to the converter output current to one terminal of the differential input. A second output branch of the current mirror supplies a current equal to the converter output current to the other terminal of the differential input. A third output branch of the current mirror supplies a multiple of the converter output current to a resistive element having a terminal connected to the fixed potential.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.