Degree Type
Dissertation
Date of Award
2003
Degree Name
Doctor of Philosophy
Department
Electrical and Computer Engineering
First Advisor
William C. Black
Second Advisor
Robert J. Weber
Abstract
The focus of this dissertation is the design of a 10 Gbit/s wireline data communication system. The data is sent from the driver chip to the receiver chip on a printed circuit board (PCB). In the GHz frequency range, the parasitic effect of various circuits along the signal path affect the quality of the signal sent. Electrostatic Discharge (ESD) protection, PCB traces and packaging increase the signal loss and distortion;The parasitic effect of ESD protection circuits limits the maximum bandwidth for data transmission. The current high speed driver architectures have the driver circuit directly connected to the chip pads and PCB traces. This causes the chip to be prone to ESD discharge effects. Placing large ESD devices that shunt the output driver to ground, results in their parasitic capacitances acting as low pass filters that severely limit the data transmission rate. The packaging and PCB material are investigated in this project too. An electrical model of the bonding wire is developed through MATLAB RTM and HSPICERTM;In order to increase the data rate, changes in the architecture are performed. The contribution of this project is the introduction of on chip monolithic 4 port RF transformers at the driver and receiver front-end circuits. The transformers act as ESD isolation devices because they filter the low frequency components of the ESD signals before they damage the driver. The driver is physically isolated from the chip exterior. The signal in the driver is conveyed to the traces outside the chip by transformer induction behavior. Spark gap devices are added as ESD discharge paths too. Through investigating several transformer architectures, planar interleaved transformers are fabricated and characterized to have a bandwidth beyond 5GHz needed for suitable data transmission. A design and characterization method of RF transformers by geometric scaling is presented;The transformers are used in the driver and receiver circuit. Through simulation, the improved design proves to increase the bandwidth of the data link significantly.
DOI
https://doi.org/10.31274/rtd-180813-16497
Publisher
Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/
Copyright Owner
Nader Elias Badr
Copyright Date
2003
Language
en
Proquest ID
AAI3328088
File Format
application/pdf
File Size
210 pages
Recommended Citation
Badr, Nader Elias, "Design of high frequency circuits for a gigabit per second data transmission system with isolation transformers and improved electrostatic protection " (2003). Retrospective Theses and Dissertations. 1923.
https://lib.dr.iastate.edu/rtd/1923