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Summary: IEEE JOURNAL OF SOLID-STATE CIRCUITS, VOL. 33, NO. 1, JANUARY 1998 109
A Wireless Implantable Multichannel
Digital Neural Recording System for
a Micromachined Sieve Electrode
Tayfun Akin, Khalil Najafi, Senior Member, IEEE, and Robert M. Bradley
Abstract-- This paper reports the development of an
implantable, fully integrated, multichannel peripheral neural
recording system, which is powered and controlled using an RF
telemetry link. The system allows recording of 6500 V neural
signals from axons regenerated through a micromachined silicon
sieve electrode. These signals are amplified using on-chip 100 Hz
to 3.1 kHz bandlimited amplifiers, multiplexed, and digitized
with a low-power (<2 mW), moderate speed (8 s/b) current-
mode 8-b analog-to-digital converter (ADC). The digitized signal
is transmitted to the outside world using a passive RF telemetry
link. The circuit is implemented using a bipolar CMOS process.
The signal processing CMOS circuitry dissipates only 10 mW
of power from a 5-V supply while operating at 2 MHz and
consumes 4 2 4 mm2
of area. The overall circuit including the
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