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最近在看Filter相關書籍/ Q1 \6 l# V5 s! V( }$ p% S
書中提到' K+ R. S% L8 U" O8 g1 F
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The time for the step response to reach the value 0.5 is an approximate measure of the average group delay, r2 c7 p4 F! s* e
and ringing in the step response indicates that the group delay varies strongly in the passband- w/ G6 j1 `& t8 z' ~
想請問為何從step response中就可以知道關於group delay" D+ B" C$ X4 G) ]
有什麼相關數學公式來驗證這些關係嗎
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voltage mode and current mode5 M2 i+ J% J4 P4 q8 n+ b: b# N L
為何voltge mode較不適用在高頻阿0 s% R, O3 b% [" P) y
書中是說voltage mode 用 feedback
9 n$ w' ~& `2 Z所以較不適用在高頻8 S$ X6 R' e% N
但是用回授) i* \! _$ M: B) W: Q# b0 V
不是頻寬增加!?% K1 N! ?6 V$ Z; z
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想請教版上各位大大這兩個問題; e7 q- |# Z6 V8 U# x0 Q) i' V$ t4 M
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感謝 |
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