e-journal

High-Power CMOS Current Driver With Accurate Transconductance for Electrical Impedance Tomography

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Current drivers are fundamental circuits in bioimpedance measurements including electrical impedance
tomography (EIT). In the case of EIT, the current driver is required to have a large output impedance to guarantee high current accuracy over a wide range of load impedance values. This paper presents an integrated current driver which meets these requirements and is capable of delivering large sinusoidal
currents to the load. The current driver employs a differential architecture and negative feedback, the latter allowing the output current to be accurately set by the ratio of the input voltage to a resistor value. The circuit was fabricated in a 0.6- m high-voltage CMOS process technology and its core occupies a silicon area of 0.64 mm . It operates froma V power supply and can deliver output currents up to 5 mA p-p. The accuracy of the maximum output current is within 0.41% up to 500 kHz, reducing to 0.47%
at 1 MHz with a total harmonic distortion of 0.69%. The output impedance is 665 k at 100 kHz and 372 k at 500 kHz.
Index Terms—Accurate transconductance, bioimpedance, CMOS circuits, current driver, electrical impedance tomography (EIT), high power design.

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Informasi Detail

Judul Seri

IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS

No. Panggil

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Penerbit

New York : IEEE., 2014

Deskripsi Fisik

IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS, VOL. 8, NO. 4, AUGUST 2014

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

VOL. 8, NO. 4, AUGUST 2014

Subjek

TEKNIK

Info Detail Spesifik

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Pernyataan Tanggungjawab

Yuli/Agus

Versi lain/terkait

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