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

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