Amplifier circuit
US6184751A · kind A · utility
4Cited by
2References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 17, 1998 |
| Grant date | Feb 6, 2001 |
| Priority date | — |
| Expiry date | Aug 17, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/18
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An amplifier circuit (20) uses a series transistor (38) to couple the output of an amplifier (26) to a tuned circuit load (40) and to act as a variable resistance. In one embodiment for a multi-band receiver, multiple series transistors (38, 42) are switched for connecting different tuned circuits (40, 44) to the amplifier's output, and an activated one of the series transistors receives a gate voltage that varies its resistance so as to achieve gain control. An activated series transistors can also provide a resistance that stabilizes the amplifier (26).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.