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There is an advent need in health industry, for an Implantable Medical Device (IMD) withlower power consumption, noise and area as much as possible, which aims at extending the life-span of the device by enhancing the performance of battery to avoid additional surgery and does not affect the tissue cells. The existing IMD detects a single disorder and consumes high power resulting in need of replacement within a period of time. Furthermore there is a sheer need to reduce the noise factor to achieve an uninterrupted signal. This paper proposes a novel Operational Transconductance Amplifier (OTA) which is used in the biosensors of IMD. The proposed OTA is designed in a 0.18  μ m CMOS (Complementary Metal Oxide Semiconductor) technology, the operational frequency is in the range of 0.36 Hz to 50 KHz and capable of measuring the gain in 60 dB. It consumes a negligible amount of (5  μ W) power per OTA from 1-V single power supply and achieves minimal input referred noise of 1.24  μ V rms , which is highly acceptable for biosensor used in IMD. The post layout simulation of the proposed integrated circuit has been performed successfully.

A 1-V, 5 μW, Atto Current Bulk-Driven CMOS Based Operational Transconductance Amplifier for Biosensor Applications