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This catalog summarizes the names and explanations of EMC terms for electromagnetic compatibility that EUTTEST has compiled.
When an electronic device or product is in operation, due to a variety of factors, the product's voltages, currents, signals, etc., can contain many unwanted noise components, many of which may be the cause of product failure or degradation of performance, which is different from the ideal situation expected by hardware development and designers. These noises are then defined as electrical...
A power delivery system is also known as a power delivery system or power supply system, or PDS for short.The impedance of a PDS is defined as the power source traveling from the power module, generally through the circuit boards, packages, and interconnections within the chip, and finally to the transistors. This is a layered power network that we generally refer to as a P...
Synchronous switching noise is defined as when multiple I/O ports of a chip are flipped in the same direction at the same time, such as from 1 to 0, the current consumed by the buffers of multiple I/Os at the same time is superimposed on the power supply and ground pins to produce a larger current, and this change in the current in the package and the pin...
The S-parameter is a parameter that describes the characteristics of a high-frequency network and is an important parameter for signal integrity, similar to the Z-parameter and Y-parameter in circuit theory. But [...]
A transmission line is a connection that is capable of propagating an electromagnetic field signal in the longitudinal direction. When the physical dimensions of the device or the dimensions of the electrical connection are comparable to the wavelength of the signal, transmission line theory is needed to analyze it. Attention needs to be paid to the characteristic impedance, reflection coefficient, and signal reflection of the transmission line.
Asymmetrical voltage is the RF nuisance voltage that appears between the electrical midpoint of the two power terminals and ground. Sometimes referred to as common mode voltage, if Va is used to represent the voltage vector between one of the power terminals and ground, and Vb represents the voltage vector between the other power terminal and ground. The value of the common mode voltage is the vector of Va and Vb...
In two-wire circuits (e.g., single-phase power supplies), a symmetrical voltage is the RFI voltage that appears between the two wires. It is sometimes referred to as the differential mode voltage. If Va is used to denote the voltage vector between one of the power terminals and ground, and Vb denotes the voltage vector between the other power terminal and ground. Then the symmetrical voltage, i.e., the differential mode voltage...
What is a current probe? A current probe shall have a specified transfer impedance over a specified frequency range, i.e., a specified ratio of the RF voltage induced in the probe to the known RF current on a single wire passing through the probe when measured according to a specified procedure. Over a specified frequency range, the current probe induces E...
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