표 1. | Table 1. 기존 TTD 연구 결과와의 비교 | Comparison of recently published TTD.

	Ref. [3]	Ref. [4]	Ref. [5]	Ref. [6]	This work
Process	130 nm CMOS	130 nm CMOS	GaAs M EMS	180 nm CMOS	180 nm CMOS
Frequency (GHz)	1～15	1～20	DC-40	5～20	6～18
Maximun delay(ps)	225	400	93	106	250
Resolution (ps)	15	5	6	3.3	1
DC power (mW)	78	2.6～6	0	0	0
RMS group delay error (ps)	N/A	8	N/A	1	11
Chip size (mm2)	1.50	4	30	0.88	2.45