Voltage-controlled oscillator having independent output frequency and amplitude
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United States of America Patent
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Dec 29, 2009
Grant Date -
Jul 3, 2008
app pub date -
Dec 30, 2006
filing date -
Dec 30, 2006
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Abstract
In one embodiment, a voltage-controlled oscillator is provided having an output signal whose frequency is responsive to a tuning signal and is independent of amplitude of oscillation. The voltage-controlled oscillator includes: a plurality of differential inverter stages coupled to form a loop, each differential inverter stage having a differential pair of transistors configured to steer a tail current from a current source, the current source sourcing the tail current responsive to a feedback signal; and a control circuit configured to generate the feedback signal responsive to a reference signal such that an amplitude of the output signal is independent of the tuning signal and depends on the reference signal, and the frequency of oscillation is decoupled from the amplitude of oscillation.
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