Re: [理工] [電子]微分器
※ 引述《dkcheng (電磁霸主)》之銘言:
: For the differentiator circuit, vin=sinωt, R=1kΩ, C=1μF, the op amp power
: supplies are ±10V, and the slew rate is 1V/μs. What is the highest signal
: frequency for which the output will faithfully look like the derivative of
: the input ?
: 下不了筆,煩請高手
此題電路並非緩衝放大器,ω = SR/Vm 可能不能用(不知道一不一定)
M
必須由SR的定義下手
Vo = -RC(dVin/dt) = -RCωcosωt
dVo | 2 3 0.5
當ω=ω 時, SR= -----| =ω ∴ω = (SR*10 )
M dt |max M M
4
SR=1V/μs代入,ω = 3.16*10
M
另外,當輸入突然改變的時候,經微分器會形成脈衝,這是電子電路上很不願見到的
雜訊干擾,除非不得已,一般是不會採用微分器來設計電路
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