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A superb collection of
software tools for performing a wide variety of EMC (Electromagnetic
Compatibility) related tasks. Automates and provides graphical display
of shielding, transient, filtering, crosstalk and pcb instances of EMC
design and analysis. Releases EMC theories for use as a set of
practical tools.
New Amplifier Ground Noise Tool!
New: Fourier Pulse Sequences Tool! Helmholtz Coils
Field Analysis!
New: Common Mode Field Coupling Tool! Magnetic Field
due to a Wire Tool!
Overview
EMC can seem a
bewildering subject, especially when a complete analysis of the
susceptibility or emission characteristics of an item of equipment is
virtually impossible. It is tempting to just 'test and see', and try
to correct non-compliances as they occur. However, many sub-sets of
the entire EMC description of the equipment are possible. These can
examine for example the performance of a decoupling capacitor in
maintaining the voltage at a chip during a current demand; Westbay
Tools provides an immediate graph of output voltage versus time, and
includes the effect of inductance in series with the capacitor.
Transient clamping using non-linear devices is not
an easy topic to analyse, so Westbay Tools provides a ready-made model
summarising load and device voltage and energy. In keeping with the
practical nature of the program, an inductance may be placed in series
with the clamping device, to assess the importance of lead and track
inductance when dealing with fast pulses.
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Analysis of a
transient voltage clamp, using a suppression diode. Pulse and load parameters
are fully definable, and load voltage may be plotted.
Westbay
Tools does not require the user to learn a Spice type programming language - the
tools and utilities are ready programmed for you to enter data. Most
importantly, it does not leave you with a mathematical EMC expression in a text
or course book, with no way to manipulate real data other than to program that
formula yourself.
Similarly, critical parameters such as dielectric constants,
or metal conductivities, are already present, not hidden away in a book! From
basic capacitance and inductor impedance calculations, to advanced crosstalk
models of wires over ground planes, Westbay Tools will prove invaluable to your
EMC program. |
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The
Waveguide Below Cut-off tool. An instant calculation is provided at a spot
frequency, whilst an attenuation vs frequency plot can also be made on-screen,
and printed.
Technical Features
Westbay Tools supports the calculations
and analyses listed below.
(Follow the highlighted links for more details).
Fields
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Common Mode Field Coupling.
Loop pick-up; unbalanced circuits, balanced circuits.
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Electromagnetic Field formulae.
Transmitter powers, field impedance, magnetic units conversions.
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Helmholtz Coils. Axial
field analysis, including graphical presentation and field tabulation.
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Magnetic Field due to a
Current in a Wire.
Shielding
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Shielding Effectiveness.
Fundamental enclosure performance. Reflection loss, Absorption loss,
Re-reflection loss. Plane, electric and magnetic waves. Conductivity and Skin
Effect are considered.
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Waveguide below cut-off.
Attenuation due to an open walled aperture extending into an enclosure.
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Cavity Resonance. Resonant
frequencies of a walled enclosure. Useful for indication of minimum resonant
frequency, although actual frequencies will be modified by the enclosure
contents in practice.
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Twisted Pair Rejection Ratio.
Degradation in rejection due to out of phase coupling at wire twists.
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Circular/Square EMI Gasket Groove
Design. Calculates gasket deflection and groove fill for all
tolerance conditions. Allows selection of industry standard or custom
diameters, and also computes the effect of lid bowing.
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Shielding effectiveness due
to an aperture in an enclosure. Emitted fields due to pcb DM Loop.
Periodic Waves
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Fourier Analysis
of trapezoidal, chopped sinusoidal, multi-pulse sequences and user-defined
waveforms, with independently definable rise and fall times, and period.
Display of harmonics referred to magnitude of fundamental.
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Filter Insertion Loss.
Display of loss versus frequency for C, L, L-C, C-L, Pi and T Circuits, and
Common Mode Choke. User defined component values, source and load resistances.
Parasitic capacitances and inductances.
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Decibel conversions. dB's
to actual power/voltage; referred values (dBm) to actual values; dBuV to dBm.
Transient Waveforms
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Transient Voltage Clamping
by non-linear devices such as varistors or suppression diodes. Waveform
consists of definable linear rise time and exponential fall time. Ground
inductance and resistance may be placed in series with clamping device. In
addition to source and load resistance, an additional series resistance may be
included. Analysis for load and device peak power, current and voltage, and
also total energy.
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Transient voltage reduction
by series inductance and resistance. Load and inductance analysis.
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Charged capacitor discharge
into resistive load. Voltage reduction at load through parallel capacitor,
through charge balancing effect. Can be used to model many transient
generation circuits, including ESD.
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Suppression Filter Step Response,
for digital signal rounding and leading edge delay analysis.
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Analysis of hybrid transient
protector, using gas discharge tube, inductor and suppression diode.
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Analysis of the Thermal Noise
in a resistance, according to bandwidth and temperature.
PCB Related Topics
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Decoupling Capacitance.
Maintenance of voltage at a chip during a current demand. In addition to
definition of nominal capacitance, ground inductance and resistance can be
defined to simulate real capacitors and track layout. Effective decoupling is
essential in avoiding fast current transients on pcb supply tracks.
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Characteristic Impedance of
various track and wire geometries, including ground plane effects.
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Transmission Line Test for
Surface Microstrip and Embedded Stripline. Returns the propagation time for a
given geometry of track, to enable comparison with signal transition time.
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Common Mode Rejection Ratio
reduction due to capacitance to ground imbalance. Useful for estimating the
effect of tolerance of filter components on critical lines.
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Ground Plane Impedance at
dc and rf frequencies, including skin effects.
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Amplifier Ground Noise Tool;
analysis of ground current coupling in single-ended and differential
amplifiers. NEW!
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Radiated emissions due to
differential and common mode current loop. Continuous spectrum plot, or
Fourier analysis of emissions due to a digital waveform.
Capacitance, Inductance
and Crosstalk
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Capacitance and Inductance
of assorted structures, including pull down dielectric constants list.
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Impedance of
Capacitance/Inductance, Resonant frequency of L-C circuits.
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Inductor Q Factor.
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Crosstalk between parallel
wires, with and without a ground plane.
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Inductance and flux density of
toroidal inductors.
Design Guides
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PCB, ESD and Shielding Design Guides.
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A flexible Design Review Check List
generator, which is fully user-editable.
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