Low voltage medium power class C power amplifier with precise gain control
US5966051A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1998 |
| Grant date | Oct 12, 1999 |
| Priority date | — |
| Expiry date | Apr 21, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/191
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A non-linear power amplifier for amplifying a constant envelope phase modulation component of a modulation signal and combining an amplitude envelope component of the modulation signal into the amplified constant envelope phase modulation component and method for performing the same. The power amplifier receives a constant envelope phase modulation signal and transmits the signal through a pair of amplifier stages which are impedance matched together. The first amplifier stage has a fixed gain which drives an impedance load and, in turn, the second amplifier stage. A variable resistance device is connected between a base of an amplifying transistor in the second amplifier stage and electrical ground for variably controlling the gain of the second amplifier stage by variably controlling the base-to-ground resistance of the amplifying transistor in the second amplifier stage. By varying the base-to-ground resistance of the amplifying transistor, the pulse width, gain, and power output of the constant envelope phase modulation signal can be controlled. The amplitude envelope component of the modulation signal is then reintroduced into the amplified constant envelope phase modulation c…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.