Design of a High Linearity Sinusoidal Current Generator Using Shifting Current Mirror Architecture

To develop a simple current generator (CG) for bio-impedance (BioZ) and electrical impedance tomography (EIT) systems, this article proposes using a shifting-current-mirror (S-CM) architecture to realize a high linearity sinusoidal CG. The proposed S-CM CG controls the amplitude of its output by selecting the unit elements using data weighted averaging (DWA) at every clock cycle, thus suppressing the mismatch. The proposed CG has shown an improvement in the average signal-to-noise-and-distortion ratio (SNDR) of up to 4.78 dB with DWA for resolutions up to 14 bits and has high linearity for resolutions up to 14, 12, and 10 bits while having the area savings of
$5\times $
,
$10\times $
, and
$20\times $
, respectively.