Power amplifier with power supply switching
US4498057A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 23, 1982 |
| Grant date | Feb 5, 1985 |
| Priority date | — |
| Expiry date | Dec 23, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/3076
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A power amplifier with power supply switching is arranged so that large positive and negative power supply voltages are supplied to collectors of second and fourth transistors via first and third transistors, respectively. Small positive and negative power supply voltages are supplied to collectors of the second and fourth transistors, respectively, and an input signal of the amplifier is amplified by the second and fourth transistors to supply an output of the amplifier to a load, wherein to a base of the first transistor is selectively applied either a divided voltage between a positive constant voltage greater than the small positive power supply voltage and the voltage of the input signal or a voltage which is a sum of the voltage of the input signal and a positive constant voltage. To the base of the third transistor is selectively applied either a divided voltage between a negative constant voltage greater than the small negative power supply voltage and the voltage of the input signal or a voltage which is a sum of the voltage of the input signal and a negative constant voltage. Such selections of application for the bases of the first and third transistors are made in respo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.