Impact of a Decoupling Capacitor in a CMOS Inverter Circuit
This article discusses CMOS inverter switching and shows the impact of a decoupling capacitor on the power rail signal integrity and radiated emissions.
Null Experiments While Measuring Signals
When measuring signals in electronic circuits some times what you see on the screen is not what you have in the circuit. Parasitic couplings, mismatching, noise pickup, and many other anomalous effects can give you the wrong picture of your problem.
Common-Impedance Coupling Between Circuits
For common-impedance coupling to occur, two circuits must share a current path (with a non-negligible impedance)
Hidden Start-up Events
Whenever an electronic circuit is first energized, transients occur in current and voltage waveforms. These start-up transients can affect the electrical and thermal behavior of components and circuits with serious reliability, EMI, and random effects. Try to characterize how your circuits start and stop.
Transients in Secondary Circuits
Richard Nute examines how transformers behave when subjected to transient overvoltage, both magnetically and capacitively.
Ferrites to Kill Ringing or Not?
Sometimes a ferrite is used to remove ringing in some applications as in power electronics or digital circuits.
Leakage Current Measuring Circuits
The leakage current measuring circuits in IEC 950 and those in North America are exactly the same.
On Limited-Current Circuits
A Product Safety Newsletter reader asked about where limited-current circuits are required by IEC 950, Sub-clause 2.4.1. He noted that a 5-volt DC circuit will give 2.5 milliamperes into the 2 kohm test resisto... Read More...
Patent for Testing Circuits to Detect Counterfeit Goods
A Japanese research facility was awarded a U.S. patent for a new method for detecting counterfeit goods by testing and analyzing circuits. The patent points out that before the 1990s, circuits were only built b... Read More...
Low-Energy Photonic Transistor Building-Block Developed
A team of scientists at the Ecole Polytechnique Federale de Lausanne have developed photonic transistor used in optical circuits that require an extremely low amount of energy to operate. The small device acts ... Read More...