Low noise oscillator having passive impedance network
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United States of America Patent
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Mar 3, 2015
Grant Date -
Apr 4, 2013
app pub date -
Aug 29, 2012
filing date -
Sep 9, 2011
priority date (Note) -
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Abstract
Apparatus and methods are disclosed related to an oscillator that includes a sustaining amplifier. One such apparatus includes a resonant circuit configured to operate at a resonant frequency, a sustaining amplifier, and a passive impedance network. The resonant circuit can have a first terminal and a second terminal. The sustaining amplifier can include at least a first switch configured to drive the first terminal of the resonant circuit in response to an input at a first control terminal of the first switch. The passive impedance network can be configured to pass a bias to the first control terminal, such as a gate of a field effect transistor, of the first switch. The passive impedance network can be electrically coupled to the second terminal of the resonant circuit and can include at least one inductor.
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