Low power radio frequency transmitter with controllable gain
US6597897B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 14, 1998 |
| Grant date | Jul 22, 2003 |
| Priority date | — |
| Expiry date | Dec 14, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C2009/00793
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A low power transmitter useful for vehicle remote keyless entry systems, for example, includes a transmitter circuit portion and a gain control circuit portion. The gain control circuit portion preferably includes an inductive load that introduces a resonant frequency that provides radio frequency gain control. The transmitter circuit portion preferably includes a transistor having a collector node and an emitter node. The gain controller circuit preferably includes a capacitive load coupled between the emitter node and the collector node of the transistor. The inductive load preferably is coupled between the emitter node of the transistor and ground.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.