Low phase noise technique for a crystal oscillator circuit
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United States of America Patent
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Jun 14, 2016
Grant Date -
Mar 10, 2016
app pub date -
Aug 27, 2015
filing date -
Sep 5, 2014
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Abstract
In aspects of a low phase noise technique for use with a crystal oscillator, a bias control circuit sets a bias voltage on the gate of a first transistor needed to sink or source an amount of current corresponding to a sensed common mode signal. The sensed common mode signal is sensed with a common mode sense circuit that is coupled across two ports of the crystal oscillator, and current is provided by a current source. The bias voltage is set by a bias controller that uses a second transistor coupled to the common mode sense circuit and the first transistor.
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