Switch mode - class B power amplifier
US4398159A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 1981 |
| Grant date | Aug 9, 1983 |
| Priority date | — |
| Expiry date | May 11, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/3081
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An input signal is applied to the inverting input of a class B amplifier and to the input of a limiter circuit. The square wave signal from the limiter is applied to the input of a switching amplifier which drives this amplifier between V and ground at the switching rate established by the input signal; thereby, obtaining a power control signal. The power control signal is applied to one terminal of a load and to the non-inverting input of said class B amplifier. Ignoring the input signal to the amplifier, this switches the output of the class B amplifier between V and ground at the same rate and in phase with the output from the switching amplifier. The gain of the input signal path in the amplifier is such that the input signal will just drive the output between V and ground. The switching action of the power control signal in combination with the input signal then causes the output signal across the load to have the same characteristic as the input signal but with a peak-to-peak amplitude of 2V.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.