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ripples at output of LF351

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hi

i m using a DAC circuit using DAC 0808 with LF 351 at its output to derive a VCO

the LF351 is giving a lot of ripples and for that reason VCO is not functioning properly the ripples are about 800mV

wat is possibe solution to remove the ripples

regards
uzmeed
 

You need to design a voltage follower right after the DAC (turns the output into a low-impedance signal) followed by an active low-pass x-pole filter to get rid of the DAC sampling frequency noise ..
:wink:
IanP
 

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