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如果我沒想錯,這應該也可叫做two-point modulation.
& A0 G0 {8 x- j8 a可以說是low-pass(kch1)和high-pass(kch2)兩個loop.
" [ N+ l& _' k+ x. DLP是locking frequency,HP是introduce mdoulation,, }; }7 `4 V( i' Z
所以基本上LP path的BW要和HP path的BW一樣,3dB cutoff freq./ T2 c- S$ i& `; f0 i
要設計成一樣,這樣就能保證flat frequency response in whole loop.
9 r, u% m5 X f3 {/ x* _* ^. \
/ y' H+ d9 z4 O- m1 J6 }! l4 i Q U. y至於loop BW的計算就是trade-off between phase noise requirement
# n8 o9 y; ^& [- Z; ?2 N2 Band modulation quality depending on the application. |
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