earticle

영어

This paper presents a single-resistance-controlled sinusoidal equi-amplitude quadrature oscillator based on Current Feedback Operational Amplifier (CFOA) which has potential applications in modulation and detection. Most of the Quadrature Oscillators (QO) available in open literature are suffering with same problem. The ratio of two outputs of those QO is frequency dependent and not equal to unity. So this paper provides condition of equi-amplitude and verifies the results by PSPICE simulation. This circuit employs three CFOAs and all the passive elements are grounded, thus it is suitable for CMOS implementation.