Optical modules and methods of making the optical modules
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United States of America Patent
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Dec 27, 2005
Grant Date -
Apr 8, 2004
app pub date -
Aug 15, 2001
filing date -
Jun 26, 2001
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Abstract
A sample & hold type phase detector is used in a CDR IC and, in jitter transfer bandwidth adjustment, VCO output waveforms 90° out of phase with each other can be inputted to the phase detector, whereby a jitter transfer bandwidth can be calculated by only the measurement of frequency and of a DC voltage and it is possible to make a jitter transfer bandwidth adjustment in DC test for IC.
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