All possible canonical second-order three-impedance class-A and class-B oscillators

A report is presented on all the possible canonical second-order single-transistor three-impedance oscillators that can be derived from the general class-A or class-B two-port network topologies. Two of the ten reported cases are already known as the class-A and class-B Colpitis oscillators. A selected case, which has the appealing feature of extending the oscillation frequency beyond the resonance frequency, is chosen for experimental validation.