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On the design of ultra low noise amplifiers for ENG recording by Alfredo Arnaud; Martin Bremermann; Joel Gak; Matias Miguez is a scholarly article available to read on EtoBox.

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Due to the extremely low amplitude of the input signals, the design of electro-neurgo-graph (ENG) amplifiers normally involves special care for flicker and thermal noise reduction. The task becomes really challenging in the case of implantable devices, because power consumption is restricted to few tens μW. In this paper, two different circuit techniques aimed to reduce flicker and thermal noise, in ultra-low noise amplifiers for implantable electronics are demonstrated. In both cases circuit design and measurement results are presented, showing an excellent performance in circuit simplicity, and noise to power consumption trade-off. The first circuit is a very simple G m -C chopper low-pass amplifier for flicker noise cancellation. It consumes only 28mW, with a measured input referred noise and offset of 1.2 Hz nV , and 2.5μV, respectively. For the reduction of thermal noise with minimum power consumption, in the second circuit, a ultra-low noise amplifier, a energy-efficient DC-DC downconverter, and low voltage design techniques are combined. Measured input referred noise in this case was 5,5 Hz nV at only 380μW power consumption. Both circuits were fabricated in a 1,5 micron tec

Author

Alfredo Arnaud; Martin Bremermann; Joel Gak; Matias Miguez

Publisher

ACM

Published

2007

Language

EN