Frequency doubler circuit with trimmable current control
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United States of America Patent
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Feb 20, 2007
Grant Date -
N/A
app pub date -
Oct 11, 2001
filing date -
Oct 26, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A frequency doubler circuit with trimmable current control. In one embodiment, the present invention provides a circuit comprising an oscillator with a current source and a frequency doubler circuit coupled to the current source. In one embodiment, the current source is for generating a reference current. In one embodiment, the frequency doubler circuit is operable to receive a first frequency signal for generating a second frequency signal and also receiving the reference current. The frequency doubler circuit, using the reference current, operates to compensate for process variation of capacitance of the frequency doubler circuit and uses the reference current to maintain a known duty cycle. In one embodiment, the circuit further comprises a control loop for generating an output current, wherein the output current, operating in conjunction with the reference current, operates to compensate for process variation of capacitance of the frequency doubler circuit and uses the reference current to maintain a known duty cycle. In one embodiment, the current source comprises a trimmable current control.
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