Scalable latch requires no capacitors or clock


Posted on Feb 14, 2013

Circuits that latch one-of-N switches usually use a digital approach. Such circuits are often useful in human-interface situations, such as audio-mixing consoles, video-feed selection, or current-loop-control redundancy systems. In high-precision analog systems, such as high-fidelity audio or video, elimination of clocking circuits, whenever possible, reduces the chances of coupling noise back into the signals of interest. The circuit in Figure 1 is a scalable one-of-N latch that has the advantages of no clock and no capacitors, and it has an intrinsic `active-channel` indication.



The operating principle of this circuit is based on current steering. A current sink comprising an n-channel JFET, the BF256C, provides approximately 5-mA current draw, which is approximately the hold current of any one of the small-signal SCRs (silicon-c




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