6 research outputs found
High performance building blocks for wireless receiver: multi-stage amplifiers and low noise amplifiers
Different wireless communication systems utilizing different standards and for multiple
applications have penetrated the normal people's life, such as Cell phone, Wireless LAN,
Bluetooth, Ultra wideband (UWB) and WiMAX systems. The wireless receiver normally
serves as the primary part of the system, which heavily influences the system performance.
This research concentrates on the designs of several important blocks of the receiver;
multi-stage amplifier and low noise amplifier.
Two novel multi-stage amplifier typologies are proposed to improve the bandwidth and
reduce the silicon area for the application where a large capacitive load exists. They were
designed using AMI 0.5 m µ CMOS technology. The simulation and measurement results
show they have the best Figure-of-Merits (FOMs) in terms of small signal and large signal
performances, with 4.6MHz and 9MHz bandwidth while consuming 0.38mW and 0.4mW
power from a 2V power supply. Two Low Noise Amplifiers (LNAs) are proposed, with one designed for narrowband
application and the other for UWB application. A noise reduction technique is proposed for
the differential cascode Common Source LNA (CS-LNA), which reduces the LNA Noise
Figure (NF), increases the LNA gain, and improves the LNA linearity. At the same time, a
novel Common Gate LNA (CG-LNA) is proposed for UWB application, which has better
linearity, lower power consumption, and reasonable noise performance.
Finally a novel practical current injection built-in-test (BIT) technique is proposed for the
RF Front-end circuits. If the off-chip component Lg and Rs values are well controlled, the
proposed technique can estimate the voltage gain of the LNA with less than 1dB (8%) error
SiGe-based broadband and high suppression frequency doubler ICs for wireless communications
制度:新 ; 報告番号:甲3419号 ; 学位の種類:博士(工学) ; 授与年月日:2011/9/15 ; 早大学位記番号:新574
Contribution à la conception d'un récepteur mobile failble coût et faible consommation dans la bande Ku pour le standard DVB-S
Cette thèse présente une étude de faisabilité d'un récepteur faible coût et faible consommation pour l'extension du standard DVS-S à la mobilité. L'objectif de ce projet est de proposer de solutions pour lever les verrous technologiques quant à la réalisation d'un tel système en technologie CMOS 65 nm. Ce manuscrit de thèse articulé autour de quatre chapitres décrit toutes les étapes depuis la définition des spécifications du réseau d'antennes et de la chaîne de réception jusqu'à la présentation de leurs performances, en passant par l'étude de leurs architectures et de la conception des différents blocs. Suite à l'étude au niveau système et au bilan de liaison, le démonstrateur envisagé est constitué d'un réseau d'antennes (huit sous-réseaux de huit antennes microruban) suivi de la mise en parallèle de huit chemins unitaires pour satisfaire les exigences (Gain, facteur de bruit, rapport signal-à-bruit...) de l'application visée. Ce travail a abouti à la démonstration de la faisabilité d'une architecture innovante. Par ailleurs, nous avons aussi démontré sa non-application pour le standard DVB-S en raison des limitations en bruit de la technologie CMOS. Cependant des pistes existent pour améliorer le rapport signal-à-bruit du démonstrateur, à savoir l'utilisation d'un LNA (Low Noise Amplifier) avec une technologie compétitive en bruit et/ou d'un traitement du signal après la démodulation en bande par un processeur analogique.This work focuses on the faisability of a low cost and low power receiver in order to extend the DVB-S standard to mobility. The objective of this project is to suggest solutions to overcome technological bottlenecks fot the realization of such a demonstrator with 65 nm CMOS technology. This report composed of four chapters, describes all steps from the specification definition to the performances of the antenna array and the receiver through the architecture study and the different blocks design. [...]BORDEAUX1-Bib.electronique (335229901) / SudocSudocFranceF
Design and analysis of wideband passive microwave devices using planar structures
A selected volume of work consisting of 84 published journal papers is presented to demonstrate the contributions made by the author in the last seven years of his work at the University of Queensland in the area of Microwave Engineering. The over-arching theme in the author’s works included in this volume is the engineering of novel passive microwave devices that are key components in the building of any microwave system. The author’s contribution covers innovative designs, design methods and analyses for the following key devices and associated systems: Wideband antennas and associated systems Band-notched and multiband antennas Directional couplers and associated systems Power dividers and associated systems Microwave filters Phase shifters Much of the motivation for the work arose from the desire to contribute to the engineering o