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An Infinite Phase Shift Delay-Locked Loop With Voltage-Controlled Sawtooth Delay Line

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2 Author(s)
Chao-Chyun Chen ; Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei ; Shen-Iuan Liu

A wide-range delay-locked loop (DLL) with infinite phase shift and digital-controlled duty cycle is presented. By changing the polarity of the input clock of the voltage-controlled sawtooth delay, this proposed DLL achieves infinite phase shift by only a single loop. The proposed DLL has been fabricated in a 0.18 mum CMOS process and the core area is 0.45&times;0.3&nbsp;mm<sup>2</sup>. The measurement results show the proposed DLL operates from 50 to 500 MHz. The duty cycle of the output clock can be adjusted from 30% to 60% in the step of 5%. At 500 MHz, the measured rms jitter and peak-to-peak jitter is 1.43 and 11.1 ps, respectively. Its power consumption is 6 mW for a supply of 1.5 V.

Published in:

IEEE Journal of Solid-State Circuits  (Volume:43 ,  Issue: 11 )