Designing periodically driven varactor circuits with guaranteed stability

Author

Sandberg, Irwin W. ; van Zyl, G.J.J.

Author_Institution

Dept. of Electr. & Comput. Eng., Texas Univ., Austin, TX, USA

Volume

9

Issue

6

fYear

1999

fDate

6/1/1999 12:00:00 AM

Firstpage

230

Lastpage

232

Abstract

In this work we show how input-output stability theory bears on the problem of obtaining a frequency-domain stability criterion that can be used to design periodically driven varactor circuits with guaranteed stability. The design criterion requires that the locus of jωZ(jω) for -∞<ω<∞ avoids a critical disk in the complex plane, where Z(jω) is the Thevenin equivalent driving-point impedance presented to the varactor at frequency ω. The location and size of the disk is a function only of the minimum and maximum incremental capacitance of the varactor. We present an example of how a varactor frequency doubler with guaranteed stability may be designed using this criterion

Keywords

capacitance; circuit stability; frequency multipliers; microwave circuits; microwave frequency convertors; nonlinear network synthesis; stability criteria; varactors; Thevenin equivalent driving-point impedance; design criterion; frequency-domain stability criterion; guaranteed stability; input-output stability theory; maximum incremental capacitance; minimum incremental capacitance; periodically driven varactor circuits; varactor frequency doubler; Capacitance; Circuit stability; Circuit testing; Frequency; Helium; Impedance; Performance loss; Stability criteria; Steady-state; Varactors;

fLanguage

English

Journal_Title

Microwave and Guided Wave Letters, IEEE

Publisher

ieee

ISSN

1051-8207

Type

jour

DOI

10.1109/75.769530

Filename

769530