search query: @supervisor Ryynänen, Jussi / total: 27
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Author: | Bahrampoor, Saman |
Title: | Monolithic Transformers for RF Electronics |
Publication type: | Master's thesis |
Publication year: | 2014 |
Pages: | 52 s. + liitt. 9 Language: eng |
Department/School: | Sähkötekniikan korkeakoulu |
Main subject: | Micro and Nanotechnology (S3010) |
Supervisor: | Ryynänen, Jussi |
Instructor: | Stadius, Kari |
Electronic version URL: | http://urn.fi/URN:NBN:fi:aalto-201502191895 |
OEVS: | Electronic archive copy is available via Aalto Thesis Database.
Instructions Reading digital theses in the closed network of the Aalto University Harald Herlin Learning CentreIn the closed network of Learning Centre you can read digital and digitized theses not available in the open network. The Learning Centre contact details and opening hours: https://learningcentre.aalto.fi/en/harald-herlin-learning-centre/ You can read theses on the Learning Centre customer computers, which are available on all floors.
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Location: | P1 Ark Aalto 2647 | Archive |
Keywords: | monolithic transformers on-chip transformers on-chip inductors electro magnetic field simulation AEL |
Abstract (eng): | In this thesis transformers for RF integrated circuits are investigated. Monolithic transformers are widely used in various RF and high frequency circuits. For instance, transformers are used as power combiners in power amplifiers, in small signal amplifiers they are used for advanced feedback arrangements, they enable integrated filter implementation, they are used as baluns and impedance matching networks, and they can be used as resonators in oscillators. Unfortunately foundry supported models for on-chip transformers are rarely available and circuit designers need to design and characterize their own transformers using electro magnetic (EM) field simulator. This is a time consuming and laborious task, yet rigorous optimization of transformer characteristics results in significant improvements. Therefore one of the aims of this thesis was to develop an automated EM simulator environment. The thesis starts with representation of transformer basics and then different types of structures for such devices are introduced and discussed. One structure called "Interleaved Transformer" is chosen to be the basis of the design for its good magnetic coupling, symmetry, high frequency range and need of only two layers. More than 50 samples of these devices are designed and characterized. This is done with the help of an automated layout drawing program that was developed in this thesis. Afterwards, they are compared to illustrate how changing the dimensions can help us achieve desired properties. From these comparisons we have generated guidelines on how to for instance maximize quality factor, band width, or coupling coefficient. Based on these findings we can conclude what dimensional properties are needed for a specific circuit requirement and finally find out how to choose correct transformer dimensions for given applications. |
ED: | 2015-03-08 |
INSSI record number: 50635
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