Abstract
This paper presents a mixed-mode CMOS duty-cycle corrector (DCC) circuit that has a dynamic frequency scaling (DFS) counter and coarse and fine tuning adjustments. A higher duty-cycle correction accuracy and smaller jitter have been achieved by utilizing the DFS counter that reduces the bit-switching glitch effect of a digital to analog converter (DAC). The proposed circuit has been designed using a 0.18-㎛ CMOS process. The measured duty cycle error is less than ±1.1% for a wide input duty-cycle range of 25-75% over a wide freqeuncy range of 0.5-1.5 GHz.
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