Analog switch
US3955103A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 12, 1975 |
| Grant date | May 4, 1976 |
| Priority date | — |
| Expiry date | Feb 12, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/68
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An analog switching circuit employs a field effect transistor as a switching element and a regulation circuit for maintaining the bias on the FET constant with changes in the amplitude of an analog signal in the circuit being controlled. The regulation circuit includes a current source, a pair of elements for generating a voltage drop connected in parallel with one another and in series with the current source, and a circuit for maintaining the voltage drops in those circuit elements equal to one another. The circuit elements are connected in series with one another between the source and the gate of the FET, such that the bias on the FET remains constant. A control circuit is operative to disrupt the balance of currents in the circuit elements to cause the FET to become nonconductive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.