In this paper a frequency-to-voltage converter is proposed for use as a speed transducer over a 100:1 range. It aims to keep to a minimum the number of pulses per revolution of the opto-electrical transducer required whilst also minimising the output voltage ripple content and giving an adequate speed of response. It operates on the basis of a phase-locked loop giving a modulation of constant mark-space ratio over the frequency range. Mathematical models of the converter are derived to analyse and predict its dynamic performance and the behaviour of a prototype practical circuit is examined.
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