Westbay Tools v2 for
Emc Analysis, Calculations and Utilities
Contact by e-mail
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.
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
Analysis of a transient voltage clamp, using a suppression
diode. Pulse and load parameters are fully definable, and load voltage may
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.
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.
Westbay Tools supports the calculations and analyses listed
below. (Follow the highlighted links for more details).
Common Mode Field Coupling. Loop pick-up; unbalanced circuits,
Electromagnetic Field formulae. Transmitter powers, field
impedance, magnetic units conversions.
Helmholtz Coils. Axial field analysis, including graphical
presentation and field tabulation.
Magnetic Field due to a Current in a Wire.
Shielding Effectiveness. Fundamental enclosure performance.
Reflection loss, Absorption loss, Re-reflection loss. Plane, electric and
magnetic waves. Conductivity and Skin Effect are considered.
Waveguide below cut-off. Attenuation due to an open walled aperture
extending into an enclosure.
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.
Twisted Pair Rejection Ratio. Degradation in rejection due to out
of phase coupling at wire twists.
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
Shielding effectiveness due to an aperture in an enclosure. Emitted
fields due to pcb DM Loop.
- 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.
- 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
conversions. dB's to actual power/voltage; referred values
(dBm) to actual values; dBuV to dBm.
- Transient Voltage
Clamping by non-linear devices such as varistors or
suppression diodes. Waveform consists of definable linear risetime
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.
- 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
- Characteristic Impedance of various track and wire
geometries, including ground plane effects.
- 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.
- Common Mode Rejection Ratio reduction due to capacitance to
ground imbalance. Useful for estimating the effect of tolerance of filter
components on critical lines.
- Ground Plane Impedance at dc and rf frequencies, including
- Amplifier Ground Noise Tool; analysis of ground current
coupling in single-ended and differential amplifiers.
- Radiated emissions due to differential and common mode
current loop. Continuous spectrum plot, or Fourier analysis of emissions due to
a digital waveform.
Inductance and Crosstalk
- Capacitance and Inductance of assorted
structures, including pull down dielectric constants list.
- Impedance of Capacitance/Inductance,
Resonant frequency of L-C circuits.
- Inductor Q Factor.
- Crosstalk between parallel wires, with and without
a ground plane.
- Inductance and flux density of toroidal inductors.
- PCB, ESD and Shielding Design Guides.
- A flexible Design Review Check List generator, which is fully
PCB Design Guides. Seven Golden Rules are accessed from here,
whilst the blue captions launch specific Tools analyses.
Westbay Tools Lite can be downloaded free of
System Requirements: Windows 95 or
Westbay Tools is a trademark of Westbay Technology Ltd.
Microsoft and Windows are trademarks of Microsoft
Copyright Westbay Technology 1995-2011.