[Retracted] A Low-Power Stable Wideband Current Source for Acupuncture Point Skin Impedance Measurements

Table 1

Measured performance and comparison.

Parameter	This work	[27]	[21]	[26]
Technology	130 nm	180 nm	180 nm	350 nm
Supply	1.2 V	1.8 V	1.5 V	5 V
Bandwidth		100 Hz–100 kHz	90 kHz	10 kHz–1 MHz
THD	0.24% at 1 MHz	0.2% at 100 kHz	1% at 90 kHz	0.79%@500 μA
Power	1.2 mW		2 mW
Max.output current	200μAp-p	400μΑp-p	350μAp-p	500μΑp-p
Output impedance	11 MΩ at 1 MHz	100 kΩ at 100 kHz	560 kΩ at 90 kHz	500 kΩ at 500 kHz
Current stability	0.74% at 1 MHz	None	None	None