A parametric study on the effects of the variations in line width on the circuit model parameters of a planar spiral inductor on GaAs

Abdelbagi, Selma (2009) A parametric study on the effects of the variations in line width on the circuit model parameters of a planar spiral inductor on GaAs. Masters thesis, UNIVERSITI TEKNOLOGI PETRONAS.

[thumbnail of MUSTAFA.pdf]
Preview
PDF
MUSTAFA.pdf

Download (1MB)

Abstract

The increasing demands for low cost radio frequency integrated circuits (RFIC’s) has
generated great attention in on-chip passive components. A spiral inductor is an
important passive component for many radio frequency circuits such as low noise
amplifiers, mixers, switches, and voltage controlled oscillators. Considerable effort
has gone into the design and modeling of the spiral inductor, however, very little
research has investigated the effects due to the errors introduced into the spiral
inductor modeling. This research investigates the effects of variations in conductor
line width on equivalent circuit model of planar rectangular spiral inductors. A
parametric study is performed where a full wave electromagnetic simulator, Sonnet
TM, is used to simulate several sets of inductors on Gallium Arsenide (GaAs) substrate
having different dimensions. The scattering parameters of a particular inductor were
simulated over the desired frequency range. These simulated scattering parameters are
used to extract the equivalent circuit model parameters using optimization process.
The extracted inductor model parameters are validated through the existing physics
based formulae. the simulation results reveals that variations in the conductor line
width affect every parameters in the equivalent circuit model of the inductor i.e. the
series inductance, the series resistance, the capacitance between the inductor turns.
Change in series inductance due to the variations in the conductor line width is nearly
a linear function of the nominal inductance. Variation in series resistance is an
exponential function of nominal conductor width. Change in line to line capacitance
due to variations in conductor line width is an exponential function of nominal
spacing between conductors. Finally, variations in conductor line width have no or
little effects on substrate capacitance.
Curve fitting techniques are utilized to extract simple equations useful for estimating
the changes in the circuit model parameters with respect to the variation in conductor
line width. These equations advantageous to the RFIC’s designer since the inductor
equivalent circuit model parameters can easily be modified to account for variations
in conductor line width and also they can be used during circuit design optimization to
explore inductor space.

Item Type: Thesis (Masters)
Departments / MOR / COE: Engineering > Electrical and Electronic
Depositing User: Users 5 not found.
Date Deposited: 04 Jun 2012 10:14
Last Modified: 25 Jan 2017 09:44
URI: http://utpedia.utp.edu.my/id/eprint/2917

Actions (login required)

View Item
View Item