Suppression of parametric oscillations in IMPATT amplifiers and

Details Suppression of parametric oscillations in IMPATT amplifiers and Suppression of parametric oscillations in IMPATT amplifiers and

1976-11-04

1977-11-01

Rolinec, Rudolph V.

Amplifiers

With semiconductor amplifying device

Including distributed parameter-type coupling

307 883, 331107R, 330 45, 330 53, H03F 310

Patent

active

040567842

ABSTRACT:
A balanced circuit for IMPATT amplifiers and oscillators, which includes at least one pair of anti-series connected matched avalanche diodes electrically connected to the junction of a balanced and an unbalanced transmission line is disclosed. The diodes which are pumped by a large-signal input, are d-c biased to operate in the avalanche condition. A parametrically generated pair of unwanted idler frequencies are separated so that one component of the parametric-pair flows in the balanced line, and the other component flows in the unbalanced line. A central branch of the unbalanced line portion is resistively loaded to overcome the parametrically induced negative resistance of the diodes operating in the avalanche condition, and to suppress all incipient unwanted parametrically generated frequencies. The resistance loading, which is frequency independent, has little effect on the impedance presented to the diodes at the large-signal frequency.

REFERENCES:
patent: 4013974 (1977-03-01), Quine

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