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Electrical Impedance Tomography (EIT) for prostate and breast cancer detection require wide-band ac current drivers which can deliver current up to 10MHz. The current drivers should exhibit low harmonic distortion and provide accurate current to the tissue being examined. This work presents an integrated current driver which can deliver 1.2mA of current up to frequencies of 10MHz. The current source was fabricated in CMOS 0.18-µm technology with a power supply of 3.3V, and occupies a core area of 0.26mm 2. The measured harmonic distortion for a peak current of 1.2mA is < 0.1% for frequencies less than 100kHz, and increases to 0.68% at 10MHz. The output impedance measured is 101kΩ at 1MHz and 19.5kΩ at 10MHz. The circuit is suitable for high frequency small form factor EIT systems.

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