An active tuning and impedance matching element

Author

Lapinoja, M. ; Rahkonen, T.

Author_Institution

Dept. of Electr. Eng., Oulu Univ., Finland

Volume

1

fYear

1998

Firstpage

559

Abstract

An integrated circuit that operates as a voltage controlled admittance with a constant real part and variable imaginary part is presented. It consists of two differential pairs, the inputs of which are phase shifted with respect to each other and their transconductance ratio can be varied. The circuit can be used as a combination of an active varactor and amplifier in integrated LC type voltage controlled oscillators, or as a tunable impedance matching element in RF inputs or outputs to compensate adaptively for the impedance mismatch due to temperature drift or large signal effects, for example

Keywords

BiCMOS analogue integrated circuits; active networks; circuit tuning; compensation; electric admittance; impedance matching; voltage-controlled oscillators; 0 to 500 MHz; 1.2 micron; RF inputs; RF outputs; active tuning element; active varactor; adaptive impedance mismatch compensation; differential pairs; integrated LC type VCOs; large signal effects; temperature drift; tunable impedance matching element; variable transconductance ratio; voltage controlled admittance; voltage controlled oscillators; Admittance; Circuit optimization; Impedance matching; Radiofrequency amplifiers; Transconductance; Tunable circuits and devices; Tuning; Varactors; Voltage control; Voltage-controlled oscillators;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1998. ISCAS '98. Proceedings of the 1998 IEEE International Symposium on

Conference_Location

Monterey, CA

Print_ISBN

0-7803-4455-3

Type

conf

DOI

10.1109/ISCAS.1998.704570

Filename

704570