Generation of second-order single-OTA RC oscillators

A direct and exhaustive method of generating canonic single-amplifier RC oscillators is introduced. Using this method, the `complete categories´ of the bandpass-based single-OTA three- and four-node RC canonic oscillators have been generated. The condition of oscillation of the resulting structures can be adjusted independently of the frequency of oscillation (FO) by the active transconductance parameter of the OTA. All the resulting oscillators enjoy low component counts. Three-node oscillators each contain only capacitors and two resistors, and the four-node oscillators each contain only two capacitors and three resistors. The sensitivities (absolute values) of the FO to the active parameter are zero and the sensitivities to the passive elements are all no greater than 1/2