This brief presents a low-power, low-area and low total harmonic distortion (THD) sinusoidal current stimulator circuit for bio-impedance measurement. Proposed current generator includes recursive digital oscillator for sine wave generation and delta-sigma modulated 1 bit current source with embedded finite impulse response filter for high resolution digital-to-current conversion. The proposed circuit implemented in 0.18-μ m CMOS process occupies 0.052 mm2, and consumes 55.6 μ W for 20 kHz, 40 μ Ap-p, 0.17% THD sine current generation.
Manuscript received May 2, 2018; revised August 23, 2018; accepted September 12, 2018. Date of publication September 18, 2018; date of current version May 28, 2019. This work was supported in part by MSIT, South Korea, through the ITRC Support Program supervised by the IITP under Grant IITP-2018-2016-0-00309-002, and in part by NRF of Korea under Grant NRF-2018R1C1B6003216. This brief was recommended by Associate Editor L. A. B. G. Oliveira. (Corresponding author: Dong-Woo Jee.) The authors are with the Department of Electrical and Computer Engineering, Ajou University, Suwon 16944, South Korea (e-mail: dwjee@ajou.ac.kr).
