Amplifier having suppressed spurious frequency components

Details Amplifier having suppressed spurious frequency components Amplifier having suppressed spurious frequency components

1989-07-05

1990-05-22

Mullins, James B.

Amplifiers

Hum or noise or distortion bucking introduced into signal...

330295, 330296, H03F 126

Patent

active

049280724

ABSTRACT:
A circuit for the suppression of spurious frequency components for use in cascaded class C common base transistor amplifiers. The circuit uses a capacitor and shunt diode connected in series between emitter and ground of each stage to slow the pulse falltime and thereby eliminate spurious frequencies resulting from parasitic-caused ringing. The cathode-to-capacitor junction is pulsed through an RF choke at the pulse repetition frequency by a pulse generator. This effectively replaces the fast trailing edge of the RF pulse with the slower turn-on time of the PIN diode circuit. The resulting slower falltime eliminates spurious frequency production that normally occurs at each stage of cascaded amplifiers.

REFERENCES:
patent: 3667049 (1972-05-01), Ostroff et al.
patent: 4320399 (1982-03-01), Buck et al.
patent: 4379996 (1983-04-01), Weber

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