Voltage controlled oscillator with a large frequency range and a low gain
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United States of America Patent
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May 23, 2017
Grant Date -
Jul 30, 2015
app pub date -
Apr 6, 2015
filing date -
Feb 6, 2013
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Abstract
A circuit includes a voltage controlled oscillator (“VCO”) having a VCO cell. The VCO cell includes a first transistor and a second transistor. The first transistor has a gate terminal coupled to a first node that also is coupled to a low-pass filter from which the gate terminal receives a first control voltage signal. A second terminal of the first transistor is connected to a first voltage source. The second transistor has a gate terminal coupled to a second node that is disposed between a capacitor and a resistor of the low pass filter. The second transistor has a second terminal connected to the first voltage source. The second transistor is larger than the first transistor, and the VCO has an output terminal for providing an output frequency signal.
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