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Regarding Power supply isolation between RF ICs

Question asked by arunashok on Oct 11, 2012
Latest reply on Oct 15, 2012 by arunashok

Hello,

 

I have in my design, a central 6 V supply from a buck converter and this is driving three 5V LDOs.  3 LDOs were selected to isolate the RFICs. LDO2 and LDO3 are powering  a modulator and a demodulator respectively and LDO1 provides power to  a LNA , and two Amplifiers. Using LDOs I can provide a better PSRR to the RFICs ( rather than driving them direclty from the buck converter). My basic question  is when the modulator and demodulator are running, will it create any interference to other devices. Should I keep extra filtering options. Any comments is welcome

 

Arun

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