SWITCH_CONTROLLED_ADDER

Published:2009/7/5 22:44:00 Author:May | From:SeekIC

Direct BCD input from thumbwheel switch and use of standard crystal frequencies are primary advantages of accumulator stage of synthesizer, one decade of which is shown. BCD adder drives four D flip-flops whose outputs are fed back and added to switch states. Frequency range depends on number of decades used. Output pulse may be used directly for synchronization.If square wave is needed, clock frequency can be doubled and output of accumulator used to clock flip-flop.-D. W. Coulboum, Set Frequency Synthesizer with Thumbwheel Switches, EDN Magazine, April 5, 1975, p 115 and117.



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