Precise phase start-up voltage controlled oscillator with...

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H03K 3/02 (2006.01) G11B 19/247 (2006.01) H03K 3/0231 (2006.01) H03K 3/354 (2006.01) H03L 3/00 (2006.01) H03L 7/099 (2006.01) H03L 7/10 (2006.01)

Patent

CA 1286372

PRECISE PHASE START-UP VOLTAGE CONTROLLED OSCILLATOR WITH ACCURATE DUTY CYCLE Abstract of the Disclosure A voltage controlled oscillator includes an inverting amplifier connected to a resonant feedback network and a comparator for comparing the input to the inverting amplifier to a reference voltage which is equal to the threshold voltage of the inverting amplifier. As a result, the oscillator provides a square wave output having a precise one-to-one duty cycle. In addition, circuitry is included for causing the oscillator to start up at a steady state value and predetermined phase.

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