PLL having circuits for selecting optimum VCO input/output characteristics
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United States of America Patent
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Jul 10, 2001
Grant Date -
N/A
app pub date -
Nov 12, 1999
filing date -
Dec 11, 1998
priority date (Note) -
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Importance
Abstract
A phase locked loop circuit includes an input comparator (2) capable of generating a deviation signal which can be used for driving an oscillator (5) so as to generate an output signal (CLKOUT) locked to the input signal. The oscillator (5) can operate according to a plurality of characteristics under the control of a control circuit (8) including searching circuits arranged to carry out a first search phase by scanning the family of characteristics admitted for the operation of the oscillator (5) by bands of progressively reduced width, according to a general, dichotomic procedure. Upon completion of this first search phase, additional circuits of fine search are destined to identify the optimum operating point, compensating possible fluctuations of the characteristics.
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