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Resistive and capacitive sensors are commonly used in biomedical applications for measuring the various physiological signals. A low power and high resolution sensor interface circuit is critical to achieve the required sensing range and system specifications. One of the commonly employed interface circuit for biomedical application is relaxation oscillator based sensor interface architecture, due to its low power and small area consumption characteristic. However, the resolution of the relaxation oscillator based circuit is limited by the output frequency counting scheme. In this paper, the authors present an improved counting scheme applied to the sensorized guidewire system that is used to manoeuvre through the arteries and blood vessels to locate areas where stenosis occurs.
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