Power Integrity and Signal Integrity - EEs Talk Tech Electrical Engineering Podcast #19

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Agenda:

00:15 Kenny helped with Scope Month

01:26 There are 2 different types of power people out there

1: power producers, like wind farms, power plants, adapters

2: power consumers, who care a lot about their power quality. Power supply ripple, etc.

3:03 Power integrity is the study of the effectiveness of the conversion and delivery of DC power from the source to the gates on the IC. - loosely paraphrased

3:45 If Moore's Law hangs on for another 600 years, we'll have a computer that's capable of simulating every single atom in the known universe.

5:00 There were only 2-3 books on power integrity a few years ago

Power integrity has been around since the 1930s

5:50 A product's functional reliability is proportional to the power quality in that product

We're supplying both current and voltage to devices, so Ohm's law comes into play.

A device has both a power plane and a ground plane.

Some power integrity owners include Istvan Novak and Ray Ridley - they talk about power planes with a flat impedance.

7:15 Flat impedance power planes - If you divide your supply power by your peak current, multiply it by your tolerance, you'll get a target impedance for your power planes.

If one can maintain a frequency flat impedance, the noise on your power supplies will perform much better.

7:55 Go back to circuits 101. An inductor is an open circuit at a high frequency. And, a power plane is essentially a big inductor. For example, when writing high speed digital data to memory, it could cause a problem.

8:40 Printed circuit boards use bypass capacitors to counteract the inductance

10:30 Experienced engineers tend to use intuition when working on power distribution. They use a lot of localized power distribution.

11:15 An SSD has 12 power supplies

A tablet may have 50 power supplies

One of our Keysight oscilloscopes have 180 power supply rails

Some next gen mobile electronics 100-200 power supplies

12:25 There are redundant power supplies spread out across devices to improve reliability. For example, there may be multiple converters that all power the same rail to share the load.

Intuition is used because a lot of people don't have access to good sim tools. They have to use some rules of thumb and over-engineer the device for reliability.

15:10 Ken ... https://www.youtube.com/watch?v=Fg3miTJIA5M