On the identification and design of single amplifier single resistance controlled oscillators

Some interesting observations are made on eight recently reported single-amplifier single-resistance-controlled (SRCO) oscillators. We show that those 8 circuits can be regrouped into two families qualified as modified Deliyannis-Friend Bridge- and modified RC: CR dual of the Deliyannis-Friend Bridge- . We, furthermore, show that only two circuits need be identified and present a synthesis method which preserves the nature and value of all admittances in each circuit belonging to a given family.