VDD-independent oscillator insensitive to process variation
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United States of America Patent
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Sep 29, 2015
Grant Date -
Dec 12, 2013
app pub date -
Aug 15, 2013
filing date -
Feb 9, 2009
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Abstract
A method of providing an oscillating signal, comprising providing a first constant current flowing from a positive power supply node, the first constant current independent of a variation in a positive power supply node voltage, providing a second constant current flowing from a positive power supply node to a second electrode of a capacitor, a first electrode of the capacitor connected directly to the positive power supply node, the second constant current mirroring the first constant current and charging the capacitor by reducing a voltage across the capacitor. A third constant current is provided flowing from the positive power supply node through a first NMOS transistor and mirroring the first constant current, the first NMOS transistor having a gate connected directly to the second electrode of the capacitor and an oscillating signal generated by turning on the first NMOS transistor when the capacitor reaches a predetermined voltage level.
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