Gate bias generating circuit for field effect transistors

Details Gate bias generating circuit for field effect transistors Gate bias generating circuit for field effect transistors

1984-03-19

1986-12-16

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250551, G01J 132

Patent

active

046298800

ABSTRACT:
A circuit for generating a gate bias for field effect transistors in which one or several field effect transistor(s), identical within certain tolerances are paralleled and have a channel current above a predetermined value, is (are) connected to one or more electrically operated light sources so that at least a part of the channel current operates the light sources which radiate light. The light is received in a photocell and is converted to a dc voltage fed directly or indirectly to the gate(s) of the field effect transistor(s) in such a manner that the gate voltage thus supplied counteracts the channel current, and that an electrical device for the adjustment of the channel current is provided. The device described is especially well suited for application in microwave technology.

REFERENCES:
patent: 3878406 (1975-04-01), Beneking
patent: 4307298 (1981-12-01), El Hamamsy et al.
patent: 4323799 (1982-04-01), King et al.
patent: 4390790 (1983-06-01), Rodriguez
patent: 4395637 (1983-07-01), El Hamamsy
patent: 4408131 (1983-10-01), Fox

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