RF power transistor control using collector current

Details RF power transistor control using collector current RF power transistor control using collector current

1998-04-20

1999-09-21

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including protection means

330284, 330281, H02H 720, H03G 310

Patent

active

059559276

ABSTRACT:
In an amplifier apparatus of the type including an RF power transistor output stage, the control circuitry of the invention provides an automatic gain control mode of operation for its power transistor of a first response time and a power limiting mode of operation for its transistor of a second, faster response time, and with the power limiting mode of operation being switched into effect in response to the sensing of the collector current flow of the power transistor beyond a prescribed value.

REFERENCES:
patent: 4547746 (1985-10-01), Erickson et al.
patent: 5121076 (1992-06-01), Lendaro
patent: 5497125 (1996-03-01), Royds

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