Multiphase sinusoidal oscillator circuits are presented which utilize Operational Transresistance Amplifier (OTRA) as the active element.The first circuit produces n odd-phase oscillations of equal amplitudes and equally spaced in phase.The second circuit is capable of producing n odd- or even- phase oscillations equally spaced in phase.
An alternative approach is discussed Bathroom Hooks in the third circuit, which utilizes a single-phase tunable oscillator circuit which is used to inject signals into a phase shifter circuits.An automatic gain control (AGC) circuit has been implemented for the second and third circuit.The circuits are simple to realize and have a low component count.
PSPICE simulations have been given to verify the theoretical analysis.The experimental outcome corroborates the theoretical Wired Doorbells propositions and simulated results.