Adaptively stabilized RF amplifier

Details Adaptively stabilized RF amplifier Adaptively stabilized RF amplifier

1986-02-26

1987-06-16

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including protection means

330145, 330149, 330207P, 330284, 455117, H03F 152

Patent

active

046738860

ABSTRACT:
An output transistor of an RF power amplifier remains stable so that it does not generate subharmonic spurious outputs. An adaptive stabilization network maintains the stability of the output by decreasing the impedance presented to the output transistor when voltage levels at the output transistor exceed a predetermined level. A combination consisting of a peak detector coupled to a Zener diode senses the predetermined level. A PIN diode couples to the Zener diode and to the output transistor so that the PIN diode becomes forward biased when the predetermined level is exceeded.

REFERENCES:
patent: 2774866 (1956-12-01), Burger
patent: 2860196 (1958-11-01), Schultz
patent: 3022421 (1962-02-01), Nygaard et al.
patent: 3345570 (1967-10-01), Matyckas
patent: 3424993 (1969-01-01), Clar
patent: 3428909 (1969-02-01), Kam et al.
patent: 4024463 (1977-05-01), Pelley
patent: 4439741 (1984-03-01), Turner, Jr.

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