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UBC Theses and Dissertations
Performance evaluation of S-parameter extraction techniques for time-domain optoelectronic vector network analyzers Ruo, Russell L.
Abstract
The objective of the thesis is to evaluate the performance of two methods recently proposed for scattering parameter (S-parameter) extraction using time-domain optoelectronic vector network analyzers. Model-based simulations of an electro-optic sampling experiment for a typical high-speed bipolar transistor were used to investigate the accuracy of the techniques in the presence of experimental non-idealities. In particular, the investigation focused on the effects of finite time window, drift and noise. The methods use step-like signals and digital filtering techniques to extract the S-parameters for one of two situations where signals are either temporally overlapped or not. From the simulations, it was determined that the approach for overlapping signals is not feasible. The experimental impairments of drift and noise interfere with the separation of overlapping signals and result in inaccurate S-parameter computation. Fair results may be obtained within a limited range of frequencies for extracting the S-parameters with the approach for non-overlapping signals. Although feasible, the latter method was not recommended over existing optoelectronic methods which use pulse-like input signals for S-parameter extraction. The digital filtering technique common to both methods was validated by an experimental measurement of signal propagation on a coplanar stripline fabricated on a multilayer S1O2/S1 substrate. The attenuation and effective dielectric constants were measured over a range of frequencies between 20 and 150 GHz. Elecromagnetic simulations of the structure performed by a collaborator were found to be in excellent agreement with the experimental results. The results show high losses and dispersive effects at low frequencies, which are attributed to the conductive substrate used.
Item Metadata
Title |
Performance evaluation of S-parameter extraction techniques for time-domain optoelectronic vector network analyzers
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1998
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Description |
The objective of the thesis is to evaluate the performance of two methods
recently proposed for scattering parameter (S-parameter) extraction using time-domain
optoelectronic vector network analyzers. Model-based simulations of an
electro-optic sampling experiment for a typical high-speed bipolar transistor were
used to investigate the accuracy of the techniques in the presence of experimental
non-idealities. In particular, the investigation focused on the effects of finite time
window, drift and noise. The methods use step-like signals and digital filtering
techniques to extract the S-parameters for one of two situations where signals are
either temporally overlapped or not. From the simulations, it was determined that
the approach for overlapping signals is not feasible. The experimental impairments
of drift and noise interfere with the separation of overlapping signals and result in
inaccurate S-parameter computation. Fair results may be obtained within a limited
range of frequencies for extracting the S-parameters with the approach for non-overlapping
signals. Although feasible, the latter method was not recommended over
existing optoelectronic methods which use pulse-like input signals for S-parameter
extraction.
The digital filtering technique common to both methods was validated by an
experimental measurement of signal propagation on a coplanar stripline fabricated
on a multilayer S1O2/S1 substrate. The attenuation and effective dielectric constants
were measured over a range of frequencies between 20 and 150 GHz. Elecromagnetic simulations of the structure performed by a collaborator were found to be in excellent
agreement with the experimental results. The results show high losses and dispersive
effects at low frequencies, which are attributed to the conductive substrate used.
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Extent |
3739306 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-05-26
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0065129
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1998-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.