Abstract
Bioelectrical impedance measurements can be used in a wide range of clinical applications for monitoring and tissue characterization. Bioimpedance measurement applications need current drivers with high output impedance and stable current injection in the frequencies from DC to about 10 MHz. This paper presents an improved current driver based on a pair of balanced operational transconductance amplifiers (OTAs) using a negative feedback loop to provide over 1 MΩ output impedance ranging from DC to about 5 MHz. The circuit has been designed and simulated using XFAB 0.6-μm CMOS high voltage transistor models with ±9V power supplies. Simulated results are presented.
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