Clock generator, communication device and sequential clock gating circuit

摘要

The present invention discloses a clock generator comprising: an oscillator operable to generate a reference clock; a multi-phase clock generating circuit operable to generate a plurality of output clocks of the same frequency but different phases according to the reference clock and stop or start outputting the output clocks according to a power control signal; a sequential clock gating circuit operable to sequentially stop or start outputting a plurality of gated clocks according to a gate control signal and maintain an output cycle number relation between the gated clocks even though the multi-phase clock generating circuit stops and then starts outputting the output clocks; and a clock operation control circuit operable to provide the power control signal and the gate control signal.

主权项

1. A clock generator comprising:
an oscillator operable to generate a reference clock; a multi-phase clock generating circuit, coupled to the oscillator, operable to generate a plurality of output clocks according to the reference clock, and operable to stop or start outputting the output clocks according to a power control signal in which the output clocks have the same frequency but different phases; a sequential clock gating circuit, coupled to the multi-phase clock generating circuit, operable to sequentially stop or start outputting a plurality of gated clocks according to a gate control signal and the plurality of output clocks, and operable to maintain an output cycle number relation between the gated clocks after the multi-phase clock generating circuit stopped and then starts outputting the output clocks; and a clock operation control circuit, coupled to the multi-phase clock generating circuit and the sequential clock gating circuit, operable to provide the power control signal and the gate control signal.