CPC H03K 3/017 (2013.01) [G06F 1/08 (2013.01); H03K 5/01 (2013.01); H03K 19/20 (2013.01); H03K 2005/00078 (2013.01)] | 21 Claims |
1. A device of correcting duty cycle, comprising:
a duty cycle correcting circuit, generating a pair of phase-shifting clocks in accordance with a pair of complementary clocks, regenerating a regenerated clock in accordance with the pair of phase-shifting clocks, and comprising a coarse adjustment delaying unit, a fine adjustment delaying unit and a regenerating circuit in series connection sequentially, wherein:
the coarse adjustment delaying unit delays the pair of complementary clocks to generate a pair of first clocks having a first phase shift, the fine adjustment delaying unit delays the pair of first clocks to generate the pair of phase-shifting clocks having a second phase shift, and the regenerating circuit regenerates the regenerated clock in accordance with the pair of phase-shifting clocks;
a controller of the duty cycle correcting circuit, coupling to the duty cycle correcting circuit; and
a duty cycle detecting circuit, coupling to the duty cycle correcting circuit and the controller of the duty cycle correcting circuit, and generating a detecting output to the controller of the duty cycle correcting circuit in accordance with a current duty cycle of the regenerated clock;
wherein the controller of the duty cycle correcting circuit controls the duty cycle correcting circuit in accordance with the detecting output to adjust the pair of phase-shifting clocks.
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