Differential amplifier having externally controllable power consumption
US4959621A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 1989 |
| Grant date | Sep 25, 1990 |
| Priority date | — |
| Expiry date | Jun 16, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/72
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A differential amplifier having externally controllable power consumption. The differential amplifier has an external circuit stage for signal-dependent setting of the power consumption. The circuit stage is composed of two field effect transistors connected parallel to one another that are arranged in series with a resistor of the output side via which the current source of the differential amplifier is set. The field effect transistors are driven by a level-converting circuit proceeding from the amplifier input, this level-converting circuit being equipped with a control circuit. The control circuit defines the operating points of the field effect transistors with and without applied input signal and thus controls the signal-dependent boosting of the amplifier current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.