LM3241
SNOSB38B –JANUARY 2009–REVISED APRIL 2013
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VIN
FB trace on another layer to be protected from noise.
7. Place noise-sensitive circuitry, such as radio IF blocks, away from the DC-DC converter, CMOS digital
blocks, and other noisy circuitry. Interference with noise-sensitive circuitry in the system can be reduce
through distance.
In mobile phones, for example, a common practice is to place the DC-DC converter on one corner of the board,
arrange the CMOS digital circuitry around it (since this also generates noise), and then place sensitive
preamplifiers and IF stages on the diagonally opposing corner. Often, the sensitive circuitry is shielded with a
metal pan and power to it is post-regulated to reduce conducted noise, using low-dropout linear regulators.
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