Amplifier devices
US4077012A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 26, 1977 |
| Grant date | Feb 28, 1978 |
| Priority date | — |
| Expiry date | Jan 26, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45701
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In an amplifier device of the type comprising a differential amplifier including a pair of parallel-connected field effect transistors, an emitter grounded transistor responsive to the output of the differential amplifier and acting as class "A" amplifier, an output terminal connected to the collector electrode of the emitter grounded transistor and a constant current drive circuit connected to the commonly connected source electrodes of the field effect transistors, a feedback resistor is connected between the output terminal and the constant current drive circuit for modulating the current of the constant current drive circuit in accordance with the amplitude of the output signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.