Abstract
In this paper, a low-voltage current-mode instrumentation amplifier (IA) will be investigated. The main structure consists of two Operational Floating Current Conveyors (OFCCs) with a high-pass filter, low-pass filter, and the chopping technique to filter out noises. The OFCC was designed to operate in the current mode that can perform all the functions of an operational amplifier in an instrumentation amplifier at low voltages. A single power supply set at 1.2V to reduce the power consumption was designed in our study. Some of the MOSFETs were designed to operate in the subthreshold region to reduce the power of the circuit. And a self-cascode structure was employed to enhance its tracking capability at the output. In our simulation, the TSMC 0.18μm CMOS technology was used for our OFCC. According to the results, the IA can perform to achieve 99 dB for common mode rejection ratio (CMRR) with a 10 kHz bandwidth. It is highly feasible to realize a low-power wearable electronic device with our IA.
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