Abstract
The operation of a novel differential pulse-frequency modulator based on the Asynchronous Delta Modulation principle is described in this paper. The complete modulator consists of a Voltage Controlled Oscillator (VCO) in a feedback configuration and generates an output pulse train whose frequency is proportional to the slope of the input signal. It is shown that the proposed system allows substantially larger input signal amplitudes for linear operation than those permitted by open loop VCO schemes or other voltage-to-frequency converters. In addition, the feedback path provides “locally” a signal that tracks the input, so that the feedback arrangement can be readily used as a demodulator at the receiver end.
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