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An Analysis of the Magnetic Second-Subharmonic Oscillator

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2 Author(s)
Lavi, A. ; Elec. Engrg. Dept., Carnegie Inst. Tech., Pittsburgh, Pa. ; Finzi, L.A.

An analysis is given for the second-subharmonic parametric oscillator with two ferromagnetic cores. "Square-loop" reasoning is employed with extreme idealization of the magnetic core properties; the effects of hysteresis losses and saturated inductance are subsequently considered. The steady-state operation, both with voltage and with current pump drives, is studied to determine the values of the circuit parameters for which the subharmonic oscillations occur. The transient build-up is evaluated by means of difference equations, and the influence of the magnitude of the excitation signal upon the transient is illustrated. The experimental waveforms agree with the analytical predictions for a wide range of drive frequencies, the upper limit investigated being 3 Mc.

Published in:

Proceedings of the IRE  (Volume:49 ,  Issue: 4 )