- May 21, 2001
One of the causes of the shortage is design trends that have changed over the last 2 decades. I have designed a few PCBs, but I have reviewed the designs of dozens more for medical instruments. When I started, the concept was to generate the voltages (12V, 5 V, 3.3 V, -5 V, -15 V, etc.) once (such in a power supply), route all kinds of voltages around to various parts of the equipment, and then have lots of capacitors at the place of use to hold those voltages steady.Is it impossible to design PMICs below 40nm?
Now the design trend is to generate one voltage (such as 12 V in a power supply), route only that 12 V around the equipment, and then have tons of PMICs, one at each place of use, creating just the voltage you need where you need it. Instead of a single PMIC, the last piece of equipment I reviewed had dozens of them.