A novel active inductor and its application to inductance-controlled oscillator

Author

Cho, Yong-Ho ; Hong, Song-Cheol ; Kwon, Young-Se

Author_Institution

Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Seoul, South Korea

Volume

45

Issue

8

fYear

1997

fDate

8/1/1997 12:00:00 AM

Firstpage

1208

Lastpage

1213

Abstract

This paper describes a novel active inductor using a common-source cascode FET with an inductive feedback. A compact lossy active inductor, which consists of a common-source FET and a feedback resistor, was used as the feedback inductor to achieve high Q-factor and tunability, as well as reduce the chip size. The fabricated active inductor achieved more than 100 Q-factors with the maximum value of 3400 over the frequency range of 200 MHz, in the vicinity of 1.7 GHz. Inductance was tuned from 9.6 to 56 nH at 1.7 GHz by the variation of the feedback resistance of the lossy active inductor. Using this active inductor (as a frequency-selective element in the resonator), a monolithic inductance-controlled FET oscillator was fabricated, which demonstrated an 18% frequency-tuning range from 1.73 to 2.07 GHz, with an output power range from -9.3 to -6.3 dBm

Keywords

MMIC oscillators; Q-factor; UHF integrated circuits; UHF oscillators; feedback oscillators; inductors; variable-frequency oscillators; 1.73 to 2.07 GHz; 200 MHz; Q-factor; active inductor; common-source cascode FET; feedback resistance; frequency-selective element; frequency-tuning range; inductance-controlled oscillator; inductive feedback; monolithic inductance-controlled FET oscillator; output power range; tunability; Active inductors; Feedback loop; Frequency; Inductance; Microwave FETs; Microwave oscillators; Resistors; Shunt (electrical); Topology; Tunable circuits and devices;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.618409

Filename

618409