Series 12 – Episode 8 – Testing platforms for signal integrity
Mick Elliott speaks with Lee Morgan, Senior Technical Marketing Manager, Tektronix about some of the issues surrounding power integrity and potential solutions.
Power integrity issues are generally unwanted changes in power rail voltages. These can happen due to high current demand, signal coupling, poor regulation, or switching noise.
“One point of confusion is that common use of the terms ‘switching noise’ and ‘simultaneous switching noise’,” notes Morgan.
Switching noise is usually associated with switch mode power supplies or regulators which are pretty common in all forms of electronics these days. Simultaneous switching noise occurs when an integrated circuit draws high current to switch multiple drivers at once.
“Now, both of these phenomenon’s, along with crosstalk, can manifest themselves as ripple,” said Morgan. “Ripple is basically any high frequency noise on a DC line.”
The design of power distribution networks, including regulators, board layout and even where you place the capacitors, can play critical roles in terms of power integrity issues.
Morgan goes on to speak about the sectors where power integrity is becoming most crucial, the instruments needed to undertake the necessary power integrity testing, and the electrification of vehicles and what this means for power integrity.