Protection circuit and method for RF power amplifiers in...

Details Protection circuit and method for RF power amplifiers in... Protection circuit and method for RF power amplifiers in...

2005-02-15

2005-02-15

Nguyen, Khanh Van (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including protection means

C330S20700P, C455S115100

Reexamination Certificate

active

06856200

ABSTRACT:
A protection circuit for a power amplifier of a radio frequency transmitter includes a sensing circuit that generates a sensed signal based on an output of the power amplifier. A reference signal generator generates a reference signal. A comparator communicates with the sensing circuit and the reference signal generator and outputs a first state when the reference signal exceeds the sensed signal and a second state when the sensed signal exceeds the reference signal. A turn off circuit turns off the power amplifier when the comparator is in the second state.

REFERENCES:
patent: 4859967 (1989-08-01), Swanson
patent: 4864251 (1989-09-01), Baur
patent: 5070309 (1991-12-01), Swanson
patent: 5081425 (1992-01-01), Jackson et al.
patent: 5196808 (1993-03-01), Pickett et al.
patent: 5905617 (1999-05-01), Kawasoe
patent: 6137366 (2000-10-01), King
patent: 6151354 (2000-11-01), Abbey
patent: 6298223 (2001-10-01), Seow
patent: 6466772 (2002-10-01), Rozenblit et al.

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