Method and apparatus for protecting power amplifiers from excess

Details Method and apparatus for protecting power amplifiers from excess Method and apparatus for protecting power amplifiers from excess

1993-05-03

1995-06-20

Sikes, William L.

Amplifiers

Miscellaneous

Amplifier protection means

330290, 330291, 330298, H03G 320, H03G 330, H03G 300

Patent

active

054263956

ABSTRACT:
Power amplifiers, which include a feedback element, may be protected from excessive operating power levels by adjusting the feedback element to reduce the drive signals to the power elements. This is accomplished by sensing the output power of the power amplifier to produce a sensing signal. When the sensing signal exceeds a predetermined threshold, a feedback element is adjusted to produce an increased feedback signal. The increased feedback signal is subtracted from an input signal, thus decreasing the drive signal. With the drive signal reduced, the output power is reduced proportional to the adjustment of the feedback element.

REFERENCES:
patent: 4563775 (1986-01-01), Yokosuka
patent: 4803440 (1989-02-01), Hotta et al.
patent: 5204637 (1993-04-01), Trinh

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