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

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.