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Abstract

Circuitry for producing the signals necessary for driving and controlling a synchro-resolver is disclosed. The circuitry includes a reference generator (84) which is driven by an AC reference signal and thus, the resulting output DC reference voltage on line (82) is locked to the AC reference signal. The DC reference voltage is then combined with a computer generated digital command signal by a MDAC (Multiplying Digital to Analog Converter) (74) to provide a control signal which varies around a selected reference level. A pulse-width modulator (112) provides a high frequency square wave output which square wave is pulse-width-modulated by the AC reference voltage. The pulse-width-modulated high frequency square wave is then provided to an amplitude modulator circuit (106) where the high frequency square wave is itself amplitude modulated by the control signal. The output of the amplitude modulator is then passed through a four-pole, low pass filter (114) to obtain an AC amplitude modulated signal which has had substantially all of the high frequency components eliminated. The AC amplitude modulated signal is then provided to a power amplifier (116) which in turn drives one of the resolver coils (117).

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