※ 引述《shackle.bbs@bbs.isu.edu.tw (最害羞的艾柏>///<)》之銘言：
: A MOS differential pair operated at a bias current of 0.8 mA employs
: transistors with W/L = 100 and μnCox = 0.2 mA/V2, using RD = 5 k-ohm, and
: RSS = 25 K-ohm. Find the differential gain, the common-mode gain, and the
: common-mode rejection ratio (in dB) if the output is taken single-endedly
: and the circuit is perfectly matched.
1.
ID=1/2 μnCox W/L (VGS-Vt)^2 = 1/2*0.8=0.4mA
gm=4 mA/V
Ad=1/2 gm RD= 10v/v (single-ended)
2.
Acm = RD/(1/gm + 2Rss) = 0.0995 v/v
3
CMRR= Ad/Acm = 100.5 20log(100.5) = 40.04dB
參考吧
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