Controlled gain amplifier
US3942129A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 4, 1974 |
| Grant date | Mar 2, 1976 |
| Priority date | — |
| Expiry date | Nov 4, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G1/0035
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A common-emitter amplifier transistor has its gain controlled by change of its transconductance as a function of its quiescent emitter current. A first controlled current applied to a diode means develops a potential thereacross which is applied between the base and emitter electrodes of the amplifier transistor. This configuration causes the quiescent collector and emitter currents of the amplifier transistor to be in well-defined proportion to the first controlled current. This permits a second controlled current linearly related to the first to be used to counteract changes in the quiescent collector current of the common-base amplifier transistor, insofar as being coupled to the amplifier load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.