Phase control circuit including an operational transconductance amplifier suitable for use in audio frequency signal processing apparatus
US3995235A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 24, 1975 |
| Grant date | Nov 30, 1976 |
| Priority date | — |
| Expiry date | Oct 24, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10H1/043
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A phase control circuit includes an amplifier having a signal combining output, an inverting input signal supplied via a first coupling path with signals to be phase controlled, and a non-inverting input supplied via a second coupling path with such signals, the second coupling path including a reactive element and a variable admittance device. The variable admittance device comprises an operational transconductance amplifier exhibiting a controllable linear transconductance characteristic and an output admittance which varies proportionally to the transconductance in response to applied bias current. Variation of the bias current in a predetermined manner produces a corresponding variation in phase shift imparted to signals provided at the signal combining output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.