METHOD AND APPARATUS OF A SELF-BIASED RC OSCILLATOR AND RAMP GENERATOR
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United States of America Patent
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Mar 15, 2016
Grant Date -
Mar 17, 2016
app pub date -
Sep 15, 2014
filing date -
Sep 15, 2014
priority date (Note) -
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Abstract
A self-biased RC (resistor-capacitor) oscillator and ramp generator circuit includes a combined current and voltage reference circuit for providing a reference current, a first reference voltage, and a second reference voltage. The combined current and voltage reference circuit includes a circuit branch of an NMOS transistor in a diode connection, a PMOS transistor in a diode connection, and a resistor coupled in series. The circuit also has a signal generating circuit that includes a capacitor. The signal generating circuit is configured to charge and discharge the capacitor between the first reference voltage and the second reference voltage. The self-biased RC oscillator and ramp generator circuit is configured to provide a ramp or saw tooth signal at a node of the capacitor and to provide an oscillator output signal at an output of the signal generating circuit.
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