Analog timer circuit with time constant multiplication effect
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United States of America Patent
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Mar 15, 2016
Grant Date -
Mar 10, 2016
app pub date -
Feb 4, 2015
filing date -
Sep 4, 2014
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Abstract
An analog timer circuit comprises a pulse source, a charge storage element, and a charge pump coupled between the pulse source and the charge storage element. A pulse signal generated by the pulse source is utilized to charge the charge storage element via the charge pump. The analog timer may further comprise a discharge pump coupled between the pulse source and the charge storage element. The pulse signal generated by the pulse source is also utilized to discharge the charge storage element via the discharge pump. For example, the charge pump and the discharge pump may be driven by respective ones of complemented and uncomplemented versions of the pulse signal generated by the pulse source. An up/down driver circuit is configured to select between charging of the charge storage element via the charge pump and discharging of the charge storage element via the discharge pump.
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