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本帖最后由 yihafewu 于 2019-4-22 15:55 编辑 % X2 u8 @; U" z- a# X% U& C2 L
?- p( B D4 f C: K. r( `; Y来自一个指导文件的原话(仅供参考,我也不知道对不对):. ~4 p- S4 K" l9 Y, Y0 J
Not placing ground layer directly below the inductor (Figure 6-c) is also a point to pay attention to, when placing inductor. Due to1 E$ S4 |. I% A3 ?# Z0 V' p8 P
the eddy current occurring in the ground layer, the inductor value decreases and the loss increases (decrease of Q) with set-off
; t* s% y3 }$ Weffect from line of magnetic force. Signal line other than ground also has the possibility of propagating switching noise caused by
0 ?. C. p! e) s, w* Veddy current. It is better to avoid wiring directly under inductor. If wiring is unavoidable, please use closed magnetic circuit1 e8 S9 ^8 x3 m# r4 c, o
structured inductor with small leak from line of magnetic force.2 P1 t6 N" t: m6 Y
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