Gain control circuits utilizing a novel semiconductor device
US3976951A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1975 |
| Grant date | Aug 24, 1976 |
| Priority date | — |
| Expiry date | Mar 26, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10D99/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A gain control circuit of the multistage differential amplifier type comprising a first pair of transistors forming a first differential amplifier supplied with an input signal, a second pair of transistors forming a second differential amplifier connected to amplify further the output of the first differential amplifier and a novel semiconductor device of the three-terminal type connected in common between the respective outputs of both the first pair of transistors and an operating voltage source, in which the gain control is attained by controlling the value of the current flowing through at least one differential amplifier. The novel semiconductor device has a semiconductive body similar to an ordinary transistor and acts as a bidirectionally conductive element with a superior symmetrical characteristic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.