LARGE SIGNAL ANALYSIS OF PARAMETRIC SUBHARMONIC OSCILLATOR.
Technical rept. on magnetic amplifiers,
CARNEGIE INST OF TECH PITTSBURGH PA DEPT OF ELECTRICAL ENGINEERING
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An analysis is given for the second subharmonic parametric oscillator with two ferromagnetic cores which is used in binary data handling systems. Square Loop techniques based on the ideal core assumption have been chosen considering subsequently the effects of hysteresis losses and saturated inductance. First, the steady state operation both with voltage and with current pump drives have been studied in order to determine the values of parameters of the circuit which give rise to the subharmonic oscillation. For this, certain general rules of logic are established which are a consequence of the magnetic idealization adopted. The transient response of the device is of primary importance for practical purposes. The switching of the output oscillations from one phase to the other is handled by the same rules of logic already established. The transient is followed half cycle by half cycle of the pump and the pertinent difference equations are derived as a guidance to the calculations. The influence of the magnitude of the initial capacitor voltage upon the transient is also illustrated. The experimental results agree with the analytical predictions for a wide range of drive frequencies. The upper limit used in the experimentation is LMC and it appears that the application of the same methods to higher frequencies is possible with satisfactory quantitative results.
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