%0 Journal Article
%T A Novel Reconfigurable MB-OFDM UWB LNA Using Programmable Current Reuse
%A Ahmed Ragheb
%A Ghazal Fahmy
%A Iman Ashour
%A Abdel Hady Ammar
%J International Journal of Microwave Science and Technology
%D 2013
%I Hindawi Publishing Corporation
%R 10.1155/2013/924161
%X This paper presents a design of a reconfigurable low noise amplifier (LNA) for multiband orthogonal frequency division multiplexing (MB-OFDM) ultra wideband (UWB) receivers. The proposed design is divided into three stages; the first one is a common gate (CG) topology to provide the input matching over a wideband. The second stage is a programmable circuit to control the mode of operation. The third stage is a current reuse topology to improve the gain, flatness and consume lower power. The proposed LNA is designed using 0.18£¿¦Ìm CMOS technology. This LNA has been designed to operate in two subbands of MB-OFDM UWB, UWB mode-1 and mode-3, as a single or concurrent mode. The simulation results exhibit the power gain up to 17.35, 18, and 11£¿dB for mode-1, mode-3, and concurrent mode, respectively. The NF is 3.5, 3.9, and 6.5 and the input return loss is better than £¿12, £¿13.57, and £¿11£¿dB over mode-1, mode-3, and concurrent mode, respectively. This design consumes 4£¿mW supplied from 1.2 V. 1. Introduction Ultra wideband (UWB) has many advantages over narrowband technology such as high data rate, low power, low complexity, and low cost technology. When The US Federal Communication Commission (FCC) recognized the potential advantages of UWB, it issued a report that allows UWB use for commercial communication systems in 2002, and its applications can operate in the unlicensed spectrum of 3.1¨C10.6£¿GHz [1]. UWB supports carrierless baseband signals such as impulse-radio IR-UWB, and it supports wideband with carrier such as multiband orthogonal frequency division multiplexing MB-OFDM UWB [2]. In MB-OFDM UWB systems, the spectrum from 3.1 to 10.6£¿GHz is divided into 14 subbands of 528£¿MHz as shown in Figure 1, which supports data rates from 53 to 480£¿Mbps [3, 4]. Figure 1: Frequency spectrum of MB-OFDM UWB system. In order to roam across different subbands, devices that support multinetwork applications are required. There is a strong motivation on using single chip supports multiband and multiapplications, due to it provides wireless access for users anywhere and anytime. In such reconfigurable devices, the design of low noise amplifier (LNA) is a critical issue because its has effects in the overall system and requirements as high gain, low noise figure (NF), and lower power consumption, with good input and output matching over each band of interest. Recently, there are some schemes proposed to the multistandard LNAs like parallel, concurrent, wideband, and reconfigurable LNA. The first approach is the parallel architecture that emploies multiple architectures
%U http://www.hindawi.com/journals/ijmst/2013/924161/