Microwave transistor stabilization circuit

Details Microwave transistor stabilization circuit Microwave transistor stabilization circuit

1978-08-09

1981-07-07

Anagnos, Larry N.

Wave transmission lines and networks

Coupling networks

Nonreciprocal gyromagnetic type

307304, 330277, 330302, H03H 1104, H03F 316, H03F 3191

Patent

active

042777640

ABSTRACT:
A microwave transistor circuit includes a pair of field effect transistors connected in cascade via a standard 50 ohm transmission line having a length equal to one-half the wavelength of the operating frequency range of the circuit. Although the field effect transistors are individually unstable at microwave frequencies, by cascading these transistors the reverse transmission coefficient is sufficiently reduced to render the overall circuit unconditionally stable. In addition, the transmission line is opened to provide physical isolation between the transistors for d.c. bias isolation and a capacitor is connected therein to provide for RF continuity.

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Hoult et al., "V.H.F. F.E.T. Preamplifier with 0:3dB Noise Figure;" Electronics Letters (pub.); vol. 11, No. 24, pp. 596-597; 11/27/75.
Pierro, IEEE Trans. on Microwave Theory and Techniques, pp. 972-975; 12/76.
Allen et al., "1.8 GHz Lumped Component Thick Film Amplifier;" Electrocomponent Science and Technology; 1974, vol. 1, pp. 141-144.
Liechti "Microwave Field--Effect Transistors--1976;" IEEE Trans. on Microwave Theory and Techniques; vol. MTT-24, No. 6, pp. 279-300; 6/76.

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