Oscillators – Ring oscillators
Reexamination Certificate
2005-01-11
2005-01-11
Mis, David (Department: 2817)
Oscillators
Ring oscillators
C331S017000, C331S034000, C331S17700V
Reexamination Certificate
active
06842079
ABSTRACT:
A VCO for a PLL may include a ring oscillator having a power supply controlled in response to the VCO's control voltage input and an inverter having an input coupled to the ring oscillator's output and also supplied with a power supply controlled by the control voltage input. Together, the output of the ring oscillator and the output of the inverter may closely approximate a differential signal. The VCO may include an amplifier for amplifying a differential input to an output in the voltage domain of the system including the PLL. The output of the ring oscillator may be used as an input to the amplifier, and the output of the inverter may be used as the other input. The power supply terminals of the ring oscillator and the inverter may be coupled to outputs of a current mirror. In one implementation, the current mirror may not be cascoded.
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Merkel Lawrence J.
Mis David
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