Timeline for ASIC Power supply requirements
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
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| Jun 26, 2015 at 21:16 | comment | added | Bimpelrekkie | I Agree with Some Hardware Guy, if you short the supplies on-chip there's not much you can do in case the logic disturbs the PLL. So separate pins is the way to go. Maybe even separate grounds ! In my work we have extremely sensitive circuits that cannot even handle the noise of a switching supply so we use a separate linear regulator for their supply. Other circuits can handle some noise so there we use a switching supply. | |
| Jun 26, 2015 at 19:57 | comment | added | Some Hardware Guy | My personal preference would be the PCB, to allow the impedance of the package itself to attenuate any noise between the two. Actually I wouldn't tie them directly, on the board I'd probably have a little filter and then connect to power. If it was a really sensitive part I'd probably use separate copper floods to star route gnd and power back to my voltage source. | |
| Jun 26, 2015 at 19:35 | comment | added | alwayslearn | Thanks for your reply. Let me make it more specific. Lets say you have sensitive analog circuit such as a PLL which requires a clean VCC supply lets call it as cl_VCC and say you have digital logic supply (d_VCC) let say both 1.2 V. Would you short them on die? package or PCB? | |
| Jun 26, 2015 at 19:03 | history | answered | Some Hardware Guy | CC BY-SA 3.0 |