Wireless monitoring of electrode-tissues interfaces for long term characterization
Analog Integrated Circuits and Signal Processing
Current mode instrumentation amplifier with rail-to-rail input and output
Analog Integrated Circuits and Signal Processing
Design strategies for multi-channel low-noise recording systems
Analog Integrated Circuits and Signal Processing
A programmable full clock rectifier and sample-and-hold amplifier for biomedical applications
Analog Integrated Circuits and Signal Processing
Proceedings of the 17th IEEE/ACM international symposium on Low-power electronics and design
Analog Integrated Circuits and Signal Processing
Hi-index | 0.01 |
In this paper, we describe a low-power low-voltage CMOS very low signal acquisition analog front-end of sensor electronic interfaces. These interfaces are mainly dedicated to biomedical implantable devices. In this work, we focus on the implantable bladder controller. Since the nerve signal has very low amplitude and low frequency, it is, at first fed to a low-voltage chopper amplifier to reduce the flicker (1/f) noise and then amplified with a programmable gain high CMRR instrumentation amplifier. This is followed by an analog signal processing circuit to rectify and bin-integrate (RBI) the amplified signal. The resulting RBI is then converted to digital and transferred to the implant's central processor where information about bladder can be extracted. The numerous analog modules of the system have been implemented in CMOS 0.35 μm, 3.3 V technology. The design, simulation and measurement results of the proposed interface are presented. At supply voltage of 2.2 V the power dissipation is less than 1.4 mW, the input equivalent noise is 56 nV/\sqrt{\rm Hz} and the error in RBI calculation is less than 0.15%.