Amplifier device for a condenser microphone
US5579397A · kind A · utility
23Cited by
2References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 13, 1994 |
| Grant date | Nov 26, 1996 |
| Priority date | — |
| Expiry date | Sep 13, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/1855
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A common-source type buffer amplifier circuit has a microphone capsule, a diode and an FET. An output end of the buffer amplifier circuit, or a drain of the FET is connected to an input end of the current mirror circuit. An output end of the current mirror circuit is connected to one end of a load resistor of which the other end is grounded. A voltage across the load resistor corresponds to an output of the amplifier and is supplied to the speaker amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.