RF power amplifier circuit

Details RF power amplifier circuit RF power amplifier circuit

2006-01-24

2006-01-24

Nguyen, Lee (Department: 2682)

Telecommunications

Transmitter

With feedback of modulated output signal

C455S127100, C330S285000, C330S296000, C330S298000

Reexamination Certificate

active

06990323

ABSTRACT:
A RF power amplifier circuit has at least one power transistor and a protection circuit protecting the power transistor against high voltages that lead to a destructive breakdown of the transistor. The circuit comprises a power transistor (2), a biasing circuit (6) biasing the power transistor; a peak detector (8) measuring the output voltage of the power transistor; and a comparator circuit (12) connected to the peak detector (8) and designed to reduce the base current of the power transistor (2) when controlled by the peak detector (8).

REFERENCES:
patent: 3852669 (1974-12-01), Bowman et al.
patent: 4041410 (1977-08-01), Belcher
patent: 4122400 (1978-10-01), Medendorp et al.
patent: 4353037 (1982-10-01), Miller
patent: 03228409 (1991-09-01), None

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