Method to improve high frequency divider bandwidth coverage
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United States of America Patent
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Jun 19, 2007
Grant Date -
Jun 8, 2006
app pub date -
Jan 24, 2005
filing date -
Dec 6, 2004
priority date (Note) -
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Abstract
A divider for a local oscillator (LO) generator system of a phase locked loop (PLL) in a transceiver chip. The divider includes at least one divider unit. Each divider unit includes a frequency divider unit for receiving an input signal having an input frequency and for outputting an output signal having an output frequency which is approximately one half of the input frequency. Each divider unit also includes a resistor bank coupled between a voltage source and the frequency divider unit, and a current stirring unit for supplying current to the frequency divider unit. The resistance of the resistor bank and a magnitude of the current supplied by the current stirring unit are variable depending on the input frequency.
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