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Microelectronic Circuits, 7th Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
C H A P T E R 10
Frequency Response
Microelectronic Circuits, 7th Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
A sketch of the frequency response of an amplifier delineating the three frequency bands of interest.
BW=fH-fL
GB=|AM|BW
Microelectronic Circuits, 7th Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
Frequency response of a CS amplifier with a source resistor.
Microelectronic Circuits, 7th Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
Method of Short-Circuit Time Constants
Microelectronic Circuits, 7th Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
Method of Short-Circuit Time Constants
ω = 1/τ = 2πf
Microelectronic Circuits, 7th Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
Example: low frequency response of a CE amplifier.
Rsig=100ΩRG1//RG2=4.7MCC1=3.33uFCS=1.75uFRD=RL=15KRS=10KCC2=0.53uFgm=1mA/V
Microelectronic Circuits, 7th Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
Method of Short-Circuit Time ConstantsRsig=100ΩRG1//RG2=4.7MCC1=3.33uFCS=1.75uFRD=RL=15KRS=10KCC2=0.53uFgm=1mA/V
100KΩ 4.7M
3.3uF
1.75uF10K
1K
15K 15K
0.53uF
10Hz 100Hz 10Hz
Microelectronic Circuits, 7th Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
A sketch of the low frequency response of a CE amplifier.
100Hz10Hz9.1Hzτ=CsRs
Microelectronic Circuits, 7th Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
Frequency response of an op-amp
Non-inverting Inverting
Replacing R=Z(s) for frequency responsewhere s=jω=j2πf
Microelectronic Circuits, 7th Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
Frequency response of an op-amp(High Pass Filter)
Microelectronic Circuits, 7th Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
Frequency response of an op-amp(Low Pass Filter)
Microelectronic Circuits, 7th Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
Frequency response of an op-amp(Band Pass Filter)