Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/30749
Title: Design of a broad-band distributed amplifier and design of cmos passive and active filters
Authors: DALPATADU K RADIKE SAMANTHA
Keywords: Broadband amplifiers, distributed amplification, CMOS active filters, CMOS passive filters, transversal filtering, active inductors
Issue Date: 18-Aug-2011
Source: DALPATADU K RADIKE SAMANTHA (2011-08-18). Design of a broad-band distributed amplifier and design of cmos passive and active filters. ScholarBank@NUS Repository.
Abstract: Broadband amplifiers are an important component in multiband radio systems and in optical receiver systems. Out of many existing topologies, the distributed amplification technique is an ingenious way of obtaining high bandwidths even greater than 100 GHz with good gain and return loss. Out of the two parts of this thesis, the first part addresses the design and implementation of a distributed amplifier on PCB. The concept of distributed amplification was deeply investigated and some of the limitations which degraded the performance of such amplifiers have been presented. The designed amplifier has a bandwidth of more than 3.0 GHz with a return loss better than 15 dB and a gain of 15 dB. Several issues encountered during design and measurement have also been addressed. The second part of this thesis is mainly concerned with the design of CMOS passive and active filters. Due to the lossy nature of the silicon substrate the design of filters with a good return loss and a good pass band rejection is a challenge. The first design of the second project is related to the design of an active filter in 2-4 GHz. The proposed topology is based on lumped and transversal element filter topology, in which transversal elements are used to compensate the losses due to the substrate. In addition, these transversal elements are also used to improve the pass band rejection of the filter. The second design addresses the design of a microwave passive filter at a centre frequency of 27.5 GHz. The proposed topology is based on the inverse Chebyshev filter prototype elements, in which inductors are designed using simple transmission lines. MIM capacitors are used to obtain the necessary capacitance values and, due to the inaccuracies of foundry provided models, capacitors were simulated in Sonnet EM simulator. The designed filter has a bandwidth of 7% at a centre frequency 27.5 GHz and a return loss of 8 dB.
URI: http://scholarbank.nus.edu.sg/handle/10635/30749
Appears in Collections:Master's Theses (Open)

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