How to isolate on-chip sensitive circuits like BGR from switching circuits which switch at 100MHz but with package inductance create Very high frequency noise?
Can we use a onchip inductor to decouple the switching (noisy) circuit and the supply sensitive circuit?
1.Star the power as close too the pad as possible.
1.1 Use a large (20u)substrate between the noisy/quite area and star it back to the pad.
2.Create as much space between noisy/quite circuits.
3. put minimum sized guard rings round all blocks.
They main point of staring back to the pad etc is to minimise the noise as much as possible, you'll never be able to eliminate it unless you use Deep Nwell to isolate it but that depends on the process you are using.