Author: Cody Jackson EllingtonPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Enhanced Frequency-Selective N-Path Filters and Receivers
Author: Cody Jackson EllingtonPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Enhanced Radio Access Technologies for Next Generation Mobile Communication
Author: Yongwan ParkPublisher: Springer Science & Business Media
ISBN: 1402055323
Category : Technology & Engineering
Languages : en
Pages : 283
Book Description
This book presents a comprehensive overview of the latest technology developments in the field of Mobile Communications. It focuses on the fundamentals of mobile communications technology and systems, including the history and service evolution of mobile communications and environments. Further to this, CDMA technology including spread spectrum, orthogonal and PN codes are introduced. Other important aspects are included.
Advances in N-path Filtering for Broadband Tunable and Interference Robust Reception
Author: Chris Michael ThomasPublisher:
ISBN: 9781321914085
Category :
Languages : en
Pages : 141
Book Description
This research aims at creating broadband tunable, fully integrated filters for the application of cognitive radio and signal classification receivers. The approach under study is the N-path filter technique which is capable of translating a baseband impedance to a reference frequency creating a tunable filter. The traditional N-path filter suffers from fundamental architectural limitations, namely: a trade-off between insertion loss and out-of-band rejection, reference clock feed-through, and jammer power handling limitations. In the first approach, the fundamental trade-off of the traditional N-path filter between insertion loss and out-of-band rejection is improved by a transmission line (T-line) N-path filter technique. The T-line N-path filter ideally absorbs the parasitic capacitance of the N-path filter into a synthetic transmission line, improving insertion loss. Moreover, the out-of-band rejection is improved by further low-pass filtering. A transmission line N-path filter was implemented in a 65 nm CMOS process that achieves a tunable band-pass filter with tunable pass-band range of 0.1-to-1.6 GHz, less than 5 dB insertion loss, 30 dB to 50 dB out-of-band rejection, in-band IIP3 of +29 dBm, and IP1dB out-of-band jammer tolerance of +11 dBm. In the second approach, a pseudorandom clocking scheme for an N-path bandpass filter is presented, which lowers the LO leakage to the filter's input and output. Measurements of a 65 nm CMOS prototype from 100 MHz to 1.4 GHz demonstrate 15 dB out-of-band rejection, P1dB of +0 dBm, in-band IIP3 of +22 dBm, out-of-band jammer tolerance of +11 dBm, and LO leakage improvement of 10 dB to 15 dB with magnitude ranging from -60 dBm to -80 dBm. Lastly, a GaN HEMT bandpass N-path filter is demonstrated for high jammer tolerance. Measurements from 50 MHz to 300 MHz of a series architecture implemented in hybrid form with Cree bare die in 400 nm technology demonstrate a IP1dB of +10 dBm, IIP3 of +24.6 dBm, and a IP1dB out-of-band jammer tolerance of +17 dBm. As an example application for the tunable front-end filter, a signal classification receiver (Cognitive radio Low-energy signal Analysis Senor IC - DARPA CLASIC program) topology is presented. The CLASIC receiver is a multi-antenna receiver that channelizes, separates, and then classifies signals within a band of interest. A key building block of the CLASIC receiver is the baseband channelizer that allows for parallel signal separation in the following stages in the receiver. Measurements were performed on a 1-to-16 BiCMOS channelizer to demonstrate feasibility. Current research avenues and potential future investigations are reviewed in the conclusion.
Wireless Discrete-Time Receivers
Author: Massoud TohidianPublisher: Cambridge University Press
ISBN: 1108173578
Category : Technology & Engineering
Languages : en
Pages : 190
Book Description
The first comprehensive guide to discrete-time (DT) receivers (RX), discussing the fundamental concepts and implications of the technology. This book will serve as an essential reference, covering the necessary building blocks of this field, such as low-noise transconductance amplifiers, current-driven mixers, DT band-pass filters, and DT low-pass filters. As well as addressing the basics, the authors present the most recent state-of-the-art techniques applied to the DT RX blocks. A step-by-step style is used to allow readers to develop the required skills to design the DT receivers at the architecture level, while providing in-depth knowledge of the details. Written by leading experts from academia, research, and industry, this book provides an excellent reference to the subject for a wide audience, from postgraduate students to experienced researchers and professionals working with RF circuits.
N-path Filtering for Wideband Receivers
Author: Cheng-kai LuoPublisher:
ISBN:
Category :
Languages : en
Pages : 110
Book Description
Growing demand for multi-band wireless systems has emphasized tunable highly linear filtering without sacrificing cost or form factor. The 3G/4G frequency-division duplex (FDD) cellular systems such as long-term evolution (LTE) are more prone to interference from strong blockers associated primarily with the co-located transmit signal. In an LTE receiver (RX), transmit signal introduces a strong out-of-band (OOB) blocker, transmit (TX) leakage, placing stringent linearity and power-handling capability requirements at the diversity RXs. In conventional multi-band systems, a large number of SAW filters are used and single-pole multi-throw switches select the appropriate SAW filter for the desired channel. The cascaded insertion loss of the filter and switch, impose a significant noise performance degradation. Therefore, filtering solutions that are tunable, blocker tolerant, and highly linear are critical to extending multi-band schemes. In this research work, tunable filters are proposed with offset band-reject filtering to address TX leakage. First, a N-path filter is demonstrated in 45-nm CMOS SOI technology and consists of a combination of tunable band-pass and band-reject filtering. A tunable filter was presented with more than a decade tuning range, high linearity and blocker tolerance for a SAW-less diversity path receiver in FDD cellular systems. The 3-dB bandwidth (BW) of the pass band is greater than 80 MHz with an independently tunable reject band, providing the ultimate rejection is 33 dB to 41 dB while the pass band insertion loss is between 2.6 dB and 4.3 dB over the tuning range. The proposed filter offers 29-dBm OOB 3rd-order input-intercept power (IIP3) and 22-dBm in band (IB) IIP3 with a 10-dBm blocker 1-dB compression point (B1dB). Then, A channel-selecting low-noise amplifier (CS-LNA) with blocker filtering is presented for a SAW-less diversity path receiver in frequency-division duplexing cellular systems. A hybrid-path bandpass filter/band-reject filter (BPF/BRF) feedback network is applied to the LNA to create close-in reject bands around the passband to suppress transmit leakage and improve the out-of-band (OOB) input-referred third-order intercept point (IIP3). Control of the frequency and depth of the reject bands is demonstrated with analysis and simulation. A cancellation linearization is applied to improve the in-band (IB) linearity. Adaptive LO swing and silicon-on-insulator (SOI) thick-oxide devices are demonstrated to improve the power-handling capability. The proposed CS-LNA is implemented in 32-nm CMOS SOI and operates from 0.4 to 6 GHz with the maximum rejection larger than 60 dB and power-handling capability up to 17 dBm. The prototype demonstrates an OOB IIP3 of 36 dBm and IB IIP3 of 10 dBm at 1 GHz. To the authors' knowledge, this is the highest blocker rejection, power-handling capability, linearity, and the widest tuning range for an LNA with tunable filtering.
Millimeter-Wave Circuits for 5G and Radar
Author: Gernot HueberPublisher: Cambridge University Press
ISBN: 1108492789
Category : Technology & Engineering
Languages : en
Pages : 455
Book Description
Discover the concepts and techniques needed to design millimeter-wave circuits for current and emerging wireless system applications.
State-of-the-Art of Millimeter-Wave Silicon Technology
Author: Jaco du PreezPublisher: Springer Nature
ISBN: 3031146557
Category : Technology & Engineering
Languages : en
Pages : 165
Book Description
This book examines the critical differences between current and next-generation Si technologies (CMOS, BiCMOS and SiC) and technology platforms (e.g. system-on-chip) in mm-wave wireless applications. We provide a basic overview of the two technologies from a technical standpoint, followed by a review of the state-of-the-art of several key building blocks in wireless systems. The influences of system requirements on the choice of semiconductor technology are vital to understanding the merits of CMOS and BiCMOS devices – e.g., output power, battery life, adjacent channel interference, cost restrictions, and so forth. These requirements, in turn, affect component-level design and performance metrics of oscillators, mixers, power and low-noise amplifiers, as well as phase-locked loops and data converters. Finally, the book offers a peek into the next generation of wireless technologies such as THz -band systems and future 6G applications.
U.S. Geological Survey Bulletin
Author: Digital Satellite Communications
Author: Giovanni E. CorazzaPublisher: Springer Science & Business Media
ISBN: 038734649X
Category : Technology & Engineering
Languages : en
Pages : 578
Book Description
Discusses long-term developments Addresses advanced physical layer techniques designed for broadband communications, for fixed and mobile terminals Considers 4G evolutions and possible convergence between different technologies
U.S. Geological Survey Bulletin
Author: Kenneth L. TanakaPublisher:
ISBN:
Category : Earth sciences
Languages : en
Pages : 494
Book Description
A workshop report on the rationale for airborne remote sensing in earth science in the next decade.