Gain control circuit
US4101841A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 30, 1977 |
| Grant date | Jul 18, 1978 |
| Priority date | — |
| Expiry date | Aug 30, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/3005
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Disclosed is a gain control circuit which comprises a gain control section including as its essential component a differential amplifier with which diodes or transistors arranged to act as diodes are connected as a load, and a control signal section including a logarithmic compression circuit and an exponential expansion circuit and providing a control signal for control of the gain of the gain control section. A temperature compensation circuit having a temperature dependence cancelling both the temperature dependence of the gain control section and that of the control signal section is provided in the bias circuit for the transistor in the last stage of the control signal section, so that the desired temperature compensation for the entire gain control circuit can be achieved at a single point.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.