Step-Wise Approximation Technique in the Design of a Function Generator

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Author(s) Patrick O. Olabisi | B. J. Olufeagba
Pages 339-344
Volume 4
Issue 6
Date June, 2014
Keywords Multiplexer, Direct Digital Synthesis (DDS), Step-wise waveform, Function Generator, Impedance Matching


In this work a simplified yet innovative approach was used to realize the digital function generator by adopting an analog device, a potential divider, to replace the Programmable Read Only Memory (PROM) stage and all its debacles, and a multiplexer to replace the Digital-to-Analog (DAC). The stepped voltage waveform obtained from the synthesis is passed through a low-pass filter (LPF) to achieve a high-purity sine wave. A corresponding 50% duty cycle square wave was obtained from the up-counter used for switching the multiplexer. This was integrated to generate triangular wave. The output stage provided impedance matching of 50Ω presented at a BNC output connector.

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