Method and apparatus for protecting RF power amplifiers

Details Method and apparatus for protecting RF power amplifiers Method and apparatus for protecting RF power amplifiers

2007-10-02

2007-10-02

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including protection means

C330S20700P

Reexamination Certificate

active

11222545

ABSTRACT:
Method and apparatus are provided for protecting radio frequency (RF) power amplifiers. A circuit (10) is provided for limiting a supply current to a first stage (Q3) of the RF power amplifier having a second stage (Q2) coupled to the first stage. The circuit comprises a comparator (14) having first and second inputs and an output, and a switching circuit (12, 20, 22, 24) having an input coupled to the output of the comparator (14) and having an output configured to couple to the first stage (Q3). The first input of the comparator (14) is configured to receive the supply current, and the second input is configured to receive a current supplied to the second stage (Q2). The comparator (14) is configured to compare a ratio of the supply current to the first stage to the current supplied to the second stage (Q2) with a predetermined value. The switching circuit (12, 20, 22, 24) is configured to limit the supply current to the first stage (Q3) when the ratio exceeds the predetermined value.

REFERENCES:
patent: 4727337 (1988-02-01), Jason
patent: 4878034 (1989-10-01), Gross et al.
patent: 5268649 (1993-12-01), Jones
patent: 5834978 (1998-11-01), Cho
patent: 7075373 (2006-07-01), Briskin et al.

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