The performances comparison between DLL and PLL based RF CMOS oscillators

In this paper, the comparison of the jitter performances and the spurious tones between DLL (Delay Locked Loop) and PLL based RF CMOS oscillators is produced. An equation which offers the evaluation of the strength of the spurious tones due to the current mismatches in charge pumps of DLL based RF CMOS oscillators is offered. By the jitter performance comparison between the PLL and DLL, some suggestions are made for the choice of an oscillator structure between DLL and PLL based oscillators fabricated in CMOS processes to get an optimum jitter performance and power consumption.