Kwesah, Ali Hadi (1977) Characterization of integrated bipolar transistors using computer aided measurements and optimisation. PhD thesis, University of Warwick.

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Abstract

The objective of this thesis was to develop a method for
measuring integrated bipolar transistors forming part of an integrated
circuit chip. These integrated circuits were produced at Plessey, Caswell.
The measurement technique was then used to investigate the validity of the
equivalent circuit at present used by Plessey's, over the frequency range
up to and beyond fT. The measuring system was based on the Hewlett
Packard microwave network analyser.
A computer aided correction program has been implemented for
calibrating the measuring system. This establishes the measurement plane
at the terminals of the device, eliminating all the parasitic components.
For calibrating the measuring system, purpose made standards of
chip size were made. Ideally one of these would be a perfect matched
load. This is difficult to achieve at microwave frequencies. Instead,
a thin-film resistor was used. This was characterized and its frequency
dependence taken into account in the calibration program.
Using the above computer aided system, the complex S-parameters
of the integrated bipolar transistors were measured at several bias
conditions. Optimization was used to obtain values for the equivalent
circuit from the measured S-parameters.
An appropriate objective function with suitable boundary
conditions has been formulated in terms of the measured S-parameters and
those calculated from the equivalent circuit.
The component values of the equivalent circuit which give agreement
between the measured and calculated S-parameters have been obtained
by applying the Hooke and Jeeves optimization routine to minimize the
objective function.

Item Type:	Thesis (PhD)
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering
Library of Congress Subject Headings (LCSH):	Bipolar transistors -- Measurement, Microwave transistors -- Measurement, Integrated circuits
Official Date:	July 1977
Dates:	Date Event July 1977 Submitted
Institution:	University of Warwick
Theses Department:	School of Engineering
Thesis Type:	PhD
Publication Status:	Unpublished
Supervisor(s)/Advisor:	McPhun, Michael Keith, 1934-
Extent:	178, [4] leaves
Language:	eng

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