1-16 and 1.5-7.5 frequency divider for clock synthesizer in digital systems
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United States of America Patent
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May 21, 2019
Grant Date -
Dec 28, 2017
app pub date -
Aug 9, 2017
filing date -
Jun 23, 2016
priority date (Note) -
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Abstract
A frequency divider unit has a digital frequency divider configured to divide by an odd integer, and a dual-edge-triggered one-shot coupled to double frequency of an output of the digital frequency divider. The frequency divider unit is configurable to divide an input frequency by a configurable ratio selectable from at least non-integer ratios of 1.5, 2.5, and 3.5. In embodiments, the frequency divider unit relies on circuit delays to determine an output pulsewidth, and in other embodiments the output pulsewidth is determined from a clock signal. In embodiments, the unit is configurable to divide an input frequency by a configurable ratio selectable from at least non-integer ratios of 1.5, 2.5, 3.5, 4.5, 5.5, 6.5, and 7.5 as well as many integer ratios including 2, 4, 6, and 8. In embodiments, the digital frequency divider is configurable to provide a 50% duty cycle to the one-shot.
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