Journal ArticleDOI
Simple oscillators-based readout circuit for low-power biomedical implant system
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TLDR
In this article, a wireless sensor readout circuit for continuous physiological parameters monitoring including a potentiostat, a data generation unit and a frequency-shift-keying (FSK) modulator unit with the low dropout (LDO) regulator for biomedical implant system is presented.Abstract:
This paper reports a wireless sensor readout circuit for continuous physiological parameters monitoring including a potentiostat, a data generation unit and a frequency-shift-keying (FSK) modulator unit with the low drop-out (LDO) regulator for biomedical implant system. The potentiostat can generate an output potential of 0.7 V for the data generation unit. The data generation unit is designed based on a relaxation oscillator scheme and can be used to sense a current signal from any amperometric biomedical sensor and convert the signal to a square waveform in which the frequency of the square wave signal is proportional to the sensor current. FSK modulation scheme has been selected for wireless transmission. Designed with a very simple ring oscillator, this modulator integrates the modulation functionality into the oscillator itself by using the data signal to control the oscillation frequency. The prototype circuits have been fabricated in a 0.35 μm bulk complementary metal-oxide semiconductor (CMOS) process. Working with a regulated 1.8 V supply, the potentiostat consumes only 2 μA of current while the data generation unit can generate around 15.7 kHz output frequency with an input current of 1 μA. The FSK modulator consumes a total current of around 19 μA for a carrier frequency around 1 MHz. An off-chip demodulator is constructed to demodulate the data signal from the FSK modulator and the demodulated signal has less than 1.6 % variation of frequency.read more
Citations
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Journal ArticleDOI
30.10 A 1TOPS/W analog deep machine-learning engine with floating-gate storage in 0.13μm CMOS
TL;DR: An analog implementation of a deep machine-learning system for efficient feature extraction that utilizes a massively parallel reconfigurable current-mode analog architecture to realize efficient computation, and leverages algorithm-level feedback to provide robustness to circuit imperfections in analog signal processing.
Proceedings Article
Phase noise and jitter in CMOS ring oscillators
TL;DR: In this article, a simple physically based analysis illustrates the noise processes in CMOS inverter-based and differential ring oscillators, showing that white noise in the differential pairs dominates the jitter and phase noise, whereas the phase noise due to flicker noise arises mainly from the tail current control circuit.
Proceedings ArticleDOI
A CMOS potentiostatic glucose monitoring system for VACNF amperometric biosensors
TL;DR: A stable glucose monitoring system for vertically aligned carbon nanofiber based biosensors using a modified grounded working electrode potentiostat using a common gate transimpedance amplifier and a current starved voltage controlled oscillator is shown.
Book ChapterDOI
Ultra-Low Power Application-Specific Integrated Circuits for Sensing
TL;DR: This chapter focuses on a number of engineering aspects related to ultra-low power ASIC circuits appropriate for implantable sensors and sensor front-ends, covering bioimpedance, neural and electrochemical sensor measurement circuits, as well as low-power analog-to-digital converter design and architectures.
Journal ArticleDOI
9.9 V ASK Demodulator Using Differential Shaper for High-Impedance Electrode
TL;DR: A cascoded HV rectifier is utilized to rectify the HV (high voltage) ASK modulated signal and generates a miniature rectified signal with voltage <3.3 V, such that the reliability problem can be avoided.
References
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Book
Communication Systems
TL;DR: This best-selling, easy to read book offers the most complete discussion on the theories and principles behind today's most advanced communications systems.
Book
CMOS Circuit Design, Layout, and Simulation
TL;DR: Regardless of one's integrated circuit (IC) design skill level, this book allows readers to experience both the theory behind, and the hands-on implementation of, complementary metal oxide semiconductor (CMOS) IC design via detailed derivations, discussions, and hundreds of design, layout, and simulation examples.
Journal ArticleDOI
An analytical MOS transistor model valid in all regions of operation and dedicated to low-voltage and low-current applications
TL;DR: In this article, a fully analytical MOS transistor model dedicated to the design and analysis of low-voltage, low-current analog circuits is presented, which exploits the inherent symmetry of the device by referring all the voltages to the local substrate.
Journal ArticleDOI
A Low-Power Integrated Circuit for a Wireless 100-Electrode Neural Recording System
Reid R. Harrison,P.T. Watkins,R.J. Kier,R.O. Lovejoy,D. Black,Richard A. Normann,Florian Solzbacher +6 more
TL;DR: A prototype integrated circuit for wireless neural recording from a 100-channel microelectrode array was developed and a two-chip system was used to record neural signals from a Utah Electrode Array in cat cortex and transmit the digitized signals wirelessly to a receiver.
Journal ArticleDOI
Phase Noise and Jitter in CMOS Ring Oscillators
TL;DR: Analysis shows that in differential ring oscillators, white noise in the differential pairs dominates the jitter and phase noise, whereas the phase noise due to flicker noise arises mainly from the tail current control circuit.