Major: Electronic Circuit Design Code: S-87

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 avail-able and circuit designers need to design and characterize their own transformers using electro magnetic (EM) field simulator. This is a time consuming and la-borious 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 goo