1 有一運算放大器,若 CMRR = 80dB ,Ad = 4500 ,Vi(+)=0.5mV ,V(i-) = 0.45mV ,求 Vo ?
A 200mV
B 225mV
C 250mV
D 300mV
CMRR = `20 log ((Ad)/(Ac))`
80 = `20 log ((4500)/(Ac))`
4 = ` log ((4500)/(Ac))`
10000 = `(4500)/(Ac)`
Ac = `4500/10000`
Ac = 0.45
Vo = Ad Vd +Ac Vc
= 4500 * (0.5m-0.45m) +0.45 * `(0.5m+0.45m)/2`
= 4500 * 0.05m +0.45 * 0.475m
= 4500 * 0.05m +0.45 * 0.475m
= 225m +0.21m
≒ 225mV
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