A variable frequency oscillator using modern current feedback amplifiers (CFAs) for high frequency applications

Author

Natarajan, Sundaram

Author_Institution

Dept. of Electr. & Comput. Eng., Tennessee Technol. Univ., Cookeville, TN, USA

fYear

2004

fDate

2004

Firstpage

417

Lastpage

421

Abstract

A well-known tunable active-RC oscillator circuit is adopted with the use of modern current feedback amplifiers (CFAs) and analyzed for its performance characteristics. Its performance characteristics are found superior to the conventional design with the voltage-mode operational amplifiers. However, it has been found that the frequency of oscillation is considerably lower than the expected value in the high frequency range due to the non-ideal characteristics of the CFA. A new compensation is suggested to eliminate this problem. The effectiveness of the compensation is proven using the PSPICE simulation of the oscillator.

Keywords

RC circuits; SPICE; circuit simulation; feedback amplifiers; operational amplifiers; variable-frequency oscillators; PSPICE simulation; current feedback amplifiers; high frequency applications; tunable active-RC oscillator circuit; variable frequency oscillator; voltage-mode operational amplifiers; Application software; Bandwidth; Capacitors; Feedback amplifiers; Frequency response; Modems; Operational amplifiers; Oscillators; Signal processing; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

System Theory, 2004. Proceedings of the Thirty-Sixth Southeastern Symposium on

ISSN

0094-2898

Print_ISBN

0-7803-8281-1

Type

conf

DOI

10.1109/SSST.2004.1295691

Filename

1295691