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Design Of Analog Cmos Integrated Circuits

This tutorial presents an overview of the technological advances in millimeter-wave (mm-wave) circuit components, antennas, and propagation that will soon allow 60-GHz transceivers to provide multigigabit per second (multi-Gb/s) wireless communication data transfers in the consumer marketplace. Our goal is to help engineers understand the convergence of communications, circuits, and antennas, as the emerging world of subterahertz and terahertz wireless communications will require understanding at the intersections of these areas. This paper covers trends and recent accomplishments in a wide range of circuits and systems topics that must be understood to create massively broadband wireless communication systems of the future. In this paper, we present some evolving applications of massively broadband wireless communications, and use tables and graphs to show research progress from the literature on various radio system components, including on-chip and in-package antennas, radio-frequency (RF) power amplifiers (PAs), low-noise amplifiers (LNAs), voltage-controlled oscillators (VCOs), mixers, and analog-to-digital converters (ADCs). We focus primarily on silicon-based technologies, as these provide the best means of implementing very low-cost, highly integrated 60-GHz mm-wave circuits. In addition, the paper illuminates characterization techniques that are required to competently design and fabricate mm-wave devices in silicon, and illustrates effects of the 60-GHz RF propagation channel for both in-building and outdoor use. The paper concludes with an overview of the standardization and commercialization efforts for 60-GHz multi-Gb/s devices, and presents a novel way to compare the data rate versus power efficiency for future broadband devices.

http://faculty.poly.edu/~tsr/wp-content/uploads/publications/abstract17.pdf

State of the Art in 60-GHz Integrated Circuits and Systems for Wireless Communications

A strain sensor has been fabricated from a polymer nanocomposite with multiwalled carbon nanotube (MWNT) fillers. The piezoresistivity
of this nanocomposite strain sensor has been investigated based on an improved three-dimensional (3D) statistical resistor network
model incorporating the tunneling effect between the neighboring carbon nanotubes (CNTs), and a fiber reorientation model. The
numerical results agree very well with the experimental measurements. As compared with traditional strain gauges, much higher sensitivity
can be obtained in the nanocomposite sensors when the volume fraction of CNT is close to the percolation threshold. For a small
CNT volume fraction, weak nonlinear piezoresistivity is observed both experimentally and from numerical simulation. The tunneling
effect is considered to be the principal mechanism of the sensor under small strains.

Tunneling effect in a polymer/carbon nanotube nanocompositestrain sensor

Before the emergence of ultra-wideband (UWB) radios, widely used wireless communications were based on sinusoidal carriers, and impulse technologies were employed only in specific applications (e.g. radar). In 2002, the Federal Communication Commission (FCC) allowed unlicensed operation between 3.1–10.6 GHz for UWB communication, using a wideband signal format with a low EIRP level (−41.3dBm/MHz). UWB communication systems then emerged as an alternative to narrowband systems and significant effort in this area has been invested at the regulatory, commercial, and research levels.

IEEE Transactions on Microwave Theory and Techniques and Antennas and Propagation Announce a Joint Special Issue on Ultra-Wideband (UWB) Technology

A system for designing a therapy or for treating a gastrointestinal disorder or a condition associated with excess weight in a subject comprising at least one electrode configured to be implanted within a body of the patient and placed at a vagus nerve, the electrode also configured to apply therapy to the vagus nerve upon application of a therapy cycle to the electrode; an implantable neuroregulator for placement in the body of the patient beneath the skin layer, the implantable neuroregulator being configured to generate a therapy cycle, wherein the therapy cycle comprises an on time during which an electrical signal is delivered, the electrical signal comprising: a) a set of pulses applied at a first selected frequency of about 150-10,000 Hz, wherein each pulse of the set of pulses has a pulse width of at least 0.01 milliseconds and less than the period of the first selected frequency.

Neural modulation devices and methods

A linearity improvement technique for elliptic filters in low-supply-voltage transceiver design for 5G (5th generation of mobile technology) communication systems has been proposed. The zero in the transfer function has been placed at the third-harmonic of the intermediate frequency (IF) signals in order to suppress the undesirable components, and thus the total harmonic distortion (THD) can be dramatically reduced. To achieve precise zero control to maximize linearity optimization, the transfer function of the elliptic filter with Tow-Thomas-II implementation has been re-derived, taking into account the operational amplifiers (op-amps) nonidealities. In this paper, a fourth-order low-pass filter, composed of two cascaded Tow-Thomas-II biquads, has been described and simulated to validate the linearity improvement technique, which features a 0.1–1.6 GHz tunable 3-dB bandwidth. In addition, 6 dB THD enhancement can be realized when adopting modified transfer function, and THD can be smaller than −46 dB with −1 dBm input power, corresponding to 1.2 Vpp differential output signal.

An 1.1 V 0.1–1.6 GHz tunable-bandwidth elliptic filter with 6 dB linearity improvement by precise zero location control in 40 nm CMOS technology for 5G applications

This paper presents experimental results of an analog baseband circuit with variable bandwidth for WLAN direct conversion receiver in UMC 0.18/spl mu/m CMOS process. A seventh order Chebyshev lowpass filter with triple bandwidth is used in the analog baseband circuit. The bandwidth is selectable from 7.56MHz, 19.5MHz, or 26.5MHz. The circuit adopts the servo loop for dc offset cancellation. It also has a gain range from 20dB to 60 dB with 10 dB steps while only dissipating 22.248mW. In addition, an automatic frequency tuning loop (ATL) is reported to achieve the bandwidth accuracy of the filter.

http://www.cisl.columbia.edu/grads/shihan/publications/A%20Low%20Power%20Fully%20Integrated%20Analog%20Baseband%20Circuit%20with%20variable%20Bandwidth%20for%20802.11%20abg%20WLAN.pdf

A low power fully integrated analog baseband circuit with variable bandwidth for 802.11 a/b/g WLAN

The pulse pressure variation associated with arterial blood flow is a valuable indicator for early diagnosis of cardiovascular diseases, which could lead to lots of health problems if left untreated. To detect the subtle wrist artery pressure, a cuffless wearable integrated system using a tunneling piezoresistive sensor, which achieves ultrahigh sensitivity, is presented in this paper. After the readout circuit amplifies and converts the pulse pressure-induced signal, a wireless communication module transmits the data to intellectual devices and eventually to the cloud storage. Real-time and sustainable pulse pressure monitoring is demonstrated from sensor detection to cloud computing. Through the digital signal processing, long-term pulse pressure monitoring improves the accuracy of cuffless applications, and measured data can accomplish cardiovascular event fast screening after being processed by Hilbert Huang transform (HHT), pulse rate variability (PRV), and multi-scale entropy (MSE) analysis.

A cuffless wearable system for real-time cutaneous pressure monitoring with cloud computing assistance

Ga In P/GaAs MISFET's, in which a Ga In P insulating layer was inserted between the gate metal and the channel layer, were compared with MESFET's experimentally and theoretically in terms of dc and microwave performance. Devices performance were evaluated by varying the thickness of the insulating layer. Wide and flat characteristics of , and versus drain current (or gate voltage) together with a high maximum current density (above 610 mA/mm) were achieved for devices with insulating layer thickness of 50 nm and 100 nm. Moreover, the maximum values of 's and 's for a 1- m gate length device both occurred when was between 50 and 100 nm. We also observed that parasitic capacitances and gate leakage currents were minimized by using the airbridge gate structure, and thus high-frequency and breakdown characteristics were greatly improved. These results demonstrate that Ga In P/GaAs airbridge gate MISFET's with insulating layer thickness between 50 and 100 nm were very suitable for microwave high-power device applications.

http://ieeexplore.ieee.org/iel1/16/12670/00585536.pdf

High-Performance Ga In P/GaAs Airbridge Gate MISFET's Grown by Gas-Source MBE

This work presents a capacitive immunosensor using on-chip electrolytic pumping and magnetic washing techniques. The proposed device possesses the advantages such as simple operation, low power consumption, and portability. The proposed device was fabricated using typical micromachining process, and is suitable for mass-production. We also demonstrated the detection of N-Terminal pro-brain-Type natriuretic peptide (NT-proBNP) using the fabricated device integrated with a CMOS capacitance sensing chip. The proposed device potentially can be used as a portable system for point-of-care applications.

http://ieeexplore.ieee.org/iel7/6749560/6765550/06765764.pdf

Shey-Shi Lu

Papers

An 1.1 V 0.1–1.6 GHz tunable-bandwidth elliptic filter with 6 dB linearity improvement by precise zero location control in 40 nm CMOS technology for 5G applications

A low power fully integrated analog baseband circuit with variable bandwidth for 802.11 a/b/g WLAN

A cuffless wearable system for real-time cutaneous pressure monitoring with cloud computing assistance

High-Performance Ga In P/GaAs Airbridge Gate MISFET's Grown by Gas-Source MBE

A capacitive immunosensor using on-chip electrolytic pumping and magnetic washing techniques for point-of-care applications