On the transformation of RC-active oscillators

It is shown that some recently proposed transformations pertaining to single op-amp oscillators may be viewed as a consequence of a more general property applicable to all RC-active oscillators (of any order and employing any number of active and passive elements) presented here in the form of a theorem. Since the theorem is proved in terms of nullors, the result is quite general and may also be applied to oscillators employing other kinds of devices which can be modeled by nullors. Some examples of practical interest are outlined.