Abstract
A current driver for electrical impedance tomography (EIT) is presented. The current driver is based on a differential input current-conveyor architecture with a wide-swing cascode output stage and a fast-settling servo loop for setting the DC output voltage. The circuit was designed and fabricated as an application specific integrated circuit (ASIC) in a standard CMOS 0.18-μm technology, uses a 3.3 V single supply voltage, and consumes 13 mW power. It operates from 10 kHz to 40 MHz, providing up to 2.7 mA pp current with an output voltage compliance of 1.6 V pp , while providing a low frequency output impedance of 315 kΩ and a total harmonic distortion below 1%. These performance specifications make the proposed current driver suitable for high frequency, high signal-to-noise-ratio (SNR) EIT applications, like detecting cancerous lesions in the prostate tissue.
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