Monolithic Transformers for RF Electronics

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Stadius, Kari
dc.contributor.author Bahrampoor, Saman
dc.date.accessioned 2015-02-19T08:50:25Z
dc.date.available 2015-02-19T08:50:25Z
dc.date.issued 2015-02-09
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/15203
dc.description.abstract 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. en
dc.format.extent 61
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.title Monolithic Transformers for RF Electronics en
dc.type G2 Pro gradu, diplomityö en
dc.contributor.school Sähkötekniikan korkeakoulu fi
dc.subject.keyword monolithic transformers en
dc.subject.keyword on-chip transformers en
dc.subject.keyword on-chip inductors en
dc.subject.keyword electro magnetic field simulation en
dc.subject.keyword AEL en
dc.identifier.urn URN:NBN:fi:aalto-201502191895
dc.programme.major Micro and Nanotechnology fi
dc.programme.mcode S3010 fi
dc.type.ontasot Master's thesis en
dc.type.ontasot Diplomityö fi
dc.contributor.supervisor Ryynänen, Jussi
dc.programme EST - Master’s Programme in Micro and Nanotechnology fi
dc.location P1 fi


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