Compensation circuit for power amplifier
US4864251A · kind A · utility
6Cited by
0References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 14, 1988 |
| Grant date | Sep 5, 1989 |
| Priority date | — |
| Expiry date | Nov 14, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/18
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A base drive compensation circuit for a power amplifier samples a fixed saturation voltage level on the output of a power transistor and couples the sampled output to an inverting input of an error amplifier having a sawtooth signal on its non-inverting input. The output of the error amplifier is a negative going signal whose duty cycle is established by the voltage level on the inverting input. The negative going signal is coupled to a switching power supply that develops a voltage which controls the base drive current to the power transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.