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5 Threads found on Decoupling Capacitor Pic
It could be that the LDO is unstable. Have you checked the ESR of your decoupling capacitor? Some LDOs are very fussy about that and the TLV2217 looks like one of them. Also, what happens if there is a "dummy" program in the pic i.e. one that does nothing, just goes round a loop? That should eliminate possible loading effects. Keith.
First establish if the pic is running properly with this checklist: 1. Do you have both VSS and both VDD pins connected? 2. Do you have a decoupling capacitor across VSS and VDD lines and is it mounted as close as possible to the pic? 3. What crystal frequency are you using and do you have the oscillator configured in the (...)
Noise can effect any digital circuits and a microcontroller is no exception. 1. Place decoupling capacitors on the powersupply pins of the microcontroller as close as possible to the chip. 2. Another important thing to consider when switching relays is to use a recirculation diode with the relay, otherwise the flyback voltages may
isolate the pic signals from the radio board by high speed Opto couplers. let the power supplies for the two sections be different. Have a decoupling capacitor and a series choke in the Vcc lineof the pic supply. try to shield the rf parts of your projct in a metal or aluminium casing. Mostly problem will be solved. (...)
Sounds like you have bad decoupling on your supply rail. Have you got a 100nF cap right next to the pic supply pin, and good decoupling on your relay supplies?

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