Radiated Susceptibility Controls
As mentioned above, the susceptibility of an electronic
circuit to an externally generated electromagnetic field is a function of
numerous variables, not the least of which is the sometimes subjective
determination of what constitutes susceptible behavior. RS Analyst
calculates the current and voltage induced at the circuit terminals, and at
each circuit component, by the electromagnetic field. It is left to the
user to determine whether the induced levels may be problematic for device
operation.
There are two ways to approach the issue of determining
susceptibility. The first is to determine analytically or experimentally
the voltage or current at the circuit
terminals that will cause the circuit to begin to respond unacceptably.
This can be quite challenging, since the way in which a circuit responds to
radio frequency noise is often unknown. The second approach is to
calculate the voltage or current induced at the circuit terminals by the
incident electromagnetic field and then make a determination, either
analytically or experimentally, whether the induced level is likely to
problematic for the circuit.
The voltage and current induced by an incident
electromagnetic field is affected by field strength, field polarization,
conductor length, conductor separation, circuit impedance, circuit filtering,
shielding and shield termination characteristics, and frequency of the incident
field. Controlling the voltage and current levels induced is a matter of
controlling as many of these factors as possible. Some parameters, such as
field strength and polarization, may be out of the control of the circuit
designer. More:
 What RS Analyst Does
Interference Path
Interference Variables
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