Gain-controlled amplifier and automatic gain control amplifier using GCLBT
US5764106A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 29, 1996 |
| Grant date | Jun 9, 1998 |
| Priority date | — |
| Expiry date | Feb 29, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10D84/409
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A gain-controlled amplifier for an integrated circuit includes a PNP gate controlled lateral bipolar transistor (GCLBT) which is configured in a common base configuration. The emitter electrode of the GCLBT is connected to a Bias-T having an inductor and a capacitor. The collector electrode of the GCLBT is coupled to a load capacitor, the capacitance of which is selected to alter the bandwidth of the amplifier. A gain control voltage is applied to the gate electrode of the GCLBT to control the amplifier gain. An input signal to be amplified is coupled to the emitter electrode of the GCLBT. An output signal, which is amplified in response to the gain control voltage, is provided from the collector electrode of the GCLBT. The gain-controlled amplifier can be used for an automatic gain control amplifier and also may be used for radio frequency and intermediate frequency amplifiers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.