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Generated January 23, 2018

Clock switching circuitry for jitter reduction

Patent Number: 6,845,490

Patent Information

Abstract
Clock switching circuitry includes a clock switching control circuit for temporarily storing a clock select signal, which is input from the outside for selecting one of a plurality of clock signals different in phase from each other. The clock switching control circuit then outputs the clock select signal in accordance with the change in the level of a timing signal that switches the clock signals. A clock output circuit outputs one of the clock signals selected in accordance with the clock select signal. A masking circuit generates the timing signal while masking it to a preselected level by taking account of changes in the levels of the clock signals.
Patent Number: 6,845,490
Issue Date: 2005-01-18

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Summary

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Citations

Patents cited by this patent

Patent Title
6,600,345 Glitch free clock select switch
6,456,165 Phase error control for phase-locked loops
6,310,498 Digital phase selection circuitry and method for reducing jitter
6,157,694 Fractional frequency divider
6,081,905 Method and apparatus for generating a clock signal from a plurality of clock phases
5,926,044 Clock switching device and method
5,872,789 Method for reducing jitter of ATM cells
5,828,255 Phase locked loop having adaptive jitter reduction

Patents that cite this patent

Patent Title
8,633,739 Frequency divider circuit
8,026,744 Clock signal switching device, clock signal switching method, data bus switching device, and data bus switching method
7,969,209 Frequency divider circuit
7,847,626 Structure and method for coupling signals to and/or from stacked semiconductor dies
7,816,952 Clock signal switching device, clock signal switching method, data bus switching device, and data bus switching method
7,456,675 Semiconductor integrated circuit device for preventing generation of irregular clock signal
7,428,717 Integrated system noise management—system level
7,423,459 Clock signal switching device, clock signal switching method, data bus switching device, and data bus switching method
7,334,152 Clock switching circuit
7,183,831 Clock switching circuit
7,145,368 Clock signal switching device, clock signal switching method, data bus switching device, and data bus switching method
6,956,793 Phase clock selector for generating a non-integer frequency division

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