microcontroller pll circuits

How much noise a microcontroller such as a PIC can introduce in a receiver with a PLL frequency synthesizer? Could it effect the VCO /PLL performance.

Any ideas to supress supply line noise other than bypass capacitors!

Yes, noise. Run your micro off of the PLL reference clock to minimize spurs.

You could also use a in line regulator between the microprocessor and the PLL. For example, run the microprocessor from +5, and have a linear regulator from the +5 V rail to +3.3, and run the PLL from the +3.3 volt rail.

Of course, you will still have grounding issued to deal with.

Dave

Is there any good reference on this topic... specifically the grounding and PLL regulator design!

u can decrease the noise through the proper layout of the PCB of the PLL circuits.

Added after 12 minutes:

in transmitter design, the problem also existed.