Short-Term Stability of a Class of Capacitively Tuned Transducer Oscillators

A class of transducer oscillators is characterized by a tuning method that exchanges short-term for long-term stability. The nonlinear effects of the internal noise, when the tuning method is used with a four-element RC feedback network, is analyzed using the principle of slowly varying phase and amplitude. The short-term stability for both white and flicker noise is given. Theoretical expressions are compared with practical measurements.