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

作者：Chen Chao Chyun^*; Liu Shen Iuan

来源：IEEE Journal of Solid-State Circuits, 2008, 43(11): 2413-2421.

DOI：10.1109/JSSC.2008.2004532

• Clock synchronization
• delay-locked loop (DLL)
• dual-loop DLL
• duty cycle
• infinite phase shift
• jitter

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 mu m CMOS process and the core area is 0.45 x 0.3 mm(2). 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.

• 出版日期2008-11
• 单位中国科学院电工研究所