DIGITAL_MIXER

Published:2009/7/9 4:40:00 Author:May | From:SeekIC

A simple digital mixer, based on two dual-Schmitt triggers (4583B) and three exclusive-OR gates, uses an RC time-delay circuit to permit easy adjustment of the output-signal pulse width. The exclusive-OR gates ,can also be used separately as a symmetrical frequency doublet.As shown, a signal passing through the Schmitt triggers is delayed by t, a value equal to RC In (VTP/VTN)where Vtp and Vtn are the positive and negative threshold voltages of the triggers.To function properly, the same time delay must be introduced to signals f1 and f2. Also, the time delay must be less than 50%of the period of f1. Provided that f1 is more than twice the value of f2, the output of the circuit will equal the difference of the two signals (i.e., f1 - f2).



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