Abstract
The ion sensitive bio-potential amplifier is the critical block in the biomedical instrument. Electrical parameters depend on material properties such as dielectric constants, charge carriers and presence of positive and negative ions. Multiple architectures are available in the literature, have a primary limitation of power consumption, bandwidth, and noise. The different circuit topologies of internal components are capable to provide acceptable value. In this work, 4 topologies of the current mirror have been explored with the primary motivation of reduction in power consumption towards nw. Simulation result of operational transconductance amplifier (OTA) with mod-Wilson current mirror combination attains the minimum power of 437 nW and achieves the input-referred noise to 2.55μV/√Hz which is minimum among different topology of the current mirror. Input referred noise found maximum with simple current mirror 2.9655μV/√Hz. The circuit has been optimized with supply voltage ±0.5V for a mid-band gain.
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