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Home Q & A Board Biology-Related Homework Help Biochemistry
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juliabreslin juliabreslin
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Posts: 96
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11 years ago
What is 3dB f (i.e. the 3dB frequency in Hz) of a negative feedback amplifier with
closed-loop dc gain of 20 if its op-amp has low-frequency gain of 100dB and one pole
at 1kHz (i.e. its second pole is high enough to neglect)

Show work please! Thanks!
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wrote...
#1
11 years ago
Gain of 100 db = 20*log( voltage gain)  ===> voltage gain = 10^5
Gain Bandwidth product = 10^5* 10^3 = 10^8

with negative feedback the dc gain is 20 db ===> voltage gain  of 10
Gain bandwidth = 10^8, so the 3db frequency = 10^7 hertz or 10 Megahertz
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