18 Jan '15, 7pm

Unlike a typical gated oscillator, this one holds its current output level when turned off:

Unlike a typical gated oscillator, this one holds its current output level when turned off:

This Design Idea is a gated oscillator with the unusual (unique?) characteristic of stopping in its current state rather than being forced high or low. Unlike a conventional gated oscillator, this one both starts and stops in its existing state whether high or low. Gating a conventional oscillator may cause the output to change state with the control signal, either at the start or the end (or both). Also, it will not produce any truncated pulses. The circuit consists of the conventional CMOS oscillator, but with the feedback split into a separate positive path (the non-inverting U2), and a controlled path (the XOR gate U1) that can be either positive or negative, depending on the state of the control input. When the control input is high, the XOR is an inverter, and its output will be the reverse of U2's output, allowing C1 to charge or discharge through R1 until the thres...

Full article: http://www.edn.com/design/analog/4434929/Gated-oscillator...

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