A Low-Power Digitally Controlled Oscillator for All Digital Phase-Locked Loops

Table 1

Impact of each control bit on the DCO period

Control Bits	THE CONVENTIONAL DCO		THE PROPOSED DCO
	Period	Delta	Period	Delta
	(ns)	(ps)	(ns)	(ps)
111111	1.8022	257.7	1.7918	270.6
100000	1.544.5	134.6	1.5212	139
010000	1.4099	69.8	1.3822	70.8
001000	1.3401	34.4	1.3114	36.8
000100	1.3057	19.8	1.2746	19.1
000010	1.2859	9.1	1.2555	9.4
000001	1.2768	9.2	1.2461	8.5
000000	1.2676	—	1.2376	—