A Low Power 8 to 1 Analog Multiplexer for Bio-Signal Acquisition System with a Function of Amplification

Abstract

This thesis proposes an ultra low power 8-1 analog multiplexer (MUX) which can deal with low voltage amplitude and low frequency bio-signal, the analog MUX is implemented in IBM 130 nm integrated circuit technology. Also, a bio-signal amplifier with low power consumption, high CMRR, and high gain is connected to the output port of the multiplexer.In this way, the bio-signals can be easily detected and selected.The challenge of this design is how to transfer such low frequency and low amplitude bio-electricity signals from the input port to the output port with low loss, and low distortion.For the analog multiplexer design, a parallel transmission gate structure is used to select the desired signal while keeping the power consumption of the eight-channel analog multiplexer to 807nW. For the amplifier design, a three-stage differential operational amplifier structure was used to amplify the weak bio-signal which passed through the transmission gate structures. The amplifier was designed with a high CMRR 106dB and reasonable gain of 66dB.iii