Analog–Digital Converter for Implantable Blood-glucose Monitors (original) (raw)

2011

Abstract

Blood-glucose monitors, like many biomedical implants, must operate autonomously, integrate into small spaces, and remain inconspicuous to the body. The problem is that, while including a battery large enough to sustain a system through its entire life impedes integration, under-sizing its energy reservoir to fit into a miniaturized platform shortens operational life. Fortunately, harvesting energy saves space because the environment (not the device) stores the energy a system requires. Harvesters, however, generate little power per unit volume so implantable sensors must operate under stringent power constraints. For this reason, this paper presents a 1.3-�W, 0.6-�m CMOS current– frequency (I–F) analog–digital converter (ADC). The differential, hysteretic-based ADC proposed uses nA-range input currents to set and compare voltage oscillations against a self-produced reference to resolve the input level an amperometric glucose sensor generates. The prototyped ADC ultimately draws 1.1...

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