SINGLE-AMPLIFIER CAPACITORLESS OSCILLATOR.

A number of schemes have been developed for realizing capacitorless oscillators over the past few years. They exploit the frequency-dependent gain of practical operational amplifiers. Analysis of such circuits usually involves a linear two-pole model for frequency-dependent gain of the op-amp. Using this two-pole model, which is well accepted for compensated op-amps, capacitorless oscillators cannot be realized with fewer than two amplifiers. Using a more accurate model, a new capacitorless oscillator with a single op-amp and at most four resistors can be realized.