Table 2.

Metric comparison with state-of-the-art.

	JSSC'16	JSSC'18	JSSC'17	JSSC'18	JSSC'20	JSSC'20
	Kassiri	Chan	Kassiri	Kim	Reza	Huang
Structure	High gain + ADC	Low gain + ADC	Δ2∑	Δ2∑	Δ2∑	VCO based
			ADC-direct	ADC-direct	ADC-direct	ADC-direct
Input range (mVpp)	4	200	Rail-to-rail	260	1,000	250
IRN (nV/√Hz)	133	127	101	44	71	53
Zin (MΩ)	Gate input	1520	1	26	1,465	4
SNDR (dB)	44.5	86	72.2	66.17	69.8	89.2
Power (μW/ch)	9.1	7.3	0.63	0.8	1.7	3.2
Area (mm2/ch)	0.09	0.113	0.013	0.024	0.023	0.08
NEF	6.9	15.3	2.86	1.81	2.86	4.06
FOMs*	132	160	161	154	155	171

^*FOMs: SNDR+ 10log(BW/P).