Amplifier circuit for capacitive transducers
US7634096B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 11, 2005 |
| Grant date | Dec 15, 2009 |
| Priority date | — |
| Expiry date | Nov 24, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/187
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An amplifier circuit for capacitive transducers, such as miniature electret or condenser microphones, wherein the amplifier circuit comprises bias control means adapted to improve settling of the amplifier circuit. Another aspect of the invention relates to a miniature condenser microphone and a monolithic integrated circuit comprising an amplifier circuit according to the present invention. The present invention provides amplifier circuits of improved performance by resolving traditionally conflicting requirements of maintaining a large input resistance of the amplifier circuit to optimize its noise performance and provide fast settling of the amplifier circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.