Voltage-controlled oscillator topology
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United States of America Patent
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Nov 8, 2011
Grant Date -
Aug 20, 2009
app pub date -
Feb 18, 2009
filing date -
Feb 19, 2008
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Abstract
A voltage-controlled oscillator is implemented with a succession of delay cells coupled in series to form an oscillator loop. The oscillator loop is supplied with reference voltages produced by a voltage generator. The reference voltages produce stable operation of the voltage-controlled oscillator. Cascode reference current generators are incorporated within the voltage generator to supply a cross-coupled arrangement of pull-up devices within each delay cell. The cross-coupled pull-up devices are instrumental in producing complementary output signaling from each delay cell. A pair of cascode current generators is configured in parallel to produce a magnitude of current according to an applied voltage and to be selectable for dual or single operation with a corresponding frequency determination.
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