A linear electronically tunable sinusoid oscillator

抄録

A linear electronically tunable sinusoid oscillator (LETSO) using a Current Feedback Amplifier (CFA) and three grounded capacitors, along with a pair of matched analog multiplier devices as the composite active building block (ABB) is presented. The design yields a high-Q filter response; thereby a sustained linear oscillatory response is implemented using the concept of Short-Circuit Natural Frequency (SCNF) at Q ∼∞. The oscillation frequency (f_o) is linearly tunable by the multiplier control voltage (V). Effects of the CFA port-rolloff parameters and parasitic capacitors are negligible. The LETSO - response upto a range of f_o∼ 12MHz with measured THD ∼ 2% and linearity error (Δ∼ 3.6%) had been experimentally verified.