Wide range glitchless switchable clock divider with modified 2/3 divider stages
A frequency divider and frequency divider chain technology, applied in the direction of pulse counter, automatic power control, counting chain pulse counter, etc., can solve the problems of increasing the frequency divider range and shortening the frequency divider chain.
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[0030] The above technique described by Vaucher et al. is used to avoid the 2 n to (2 n+1 -1) The crossover range limitation does not completely shut down the downstream stage. This means that downstream stages will still consume current and cause spurs on the output clock. Since the divider's supply voltage has a series resistance (unlike an ideal supply), drawing current through this resistor will cause modulation of the supply, resulting in spurious noise on the output clock. Nor does it provide a solution for switching the division ratio without failure. Using a divide-by-one approach draws extra current and adds extra delay, which limits the ability to change the divider ratio without glitches at high input frequencies.
[0031] Embodiments described herein shut down downstream stages to prevent spurious noise and provide the necessary circuitry to switch between any two valid division ratios without glitches. The advantage of the modified divider stage describe...
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