Derive the transfer function of the circuit in
Fig.P2.93(foranidealopamp)andshowthatitcanbewritten in the
form
Vo Vi = −R2/R1 [1+(ω1/jω)][1+j(ω/ω2)] whereω1=1/C1R1
andω2=1/C2R2.Assumingthatthecircuit is designed such that ω2 ω1,
find approximate expressions
for the transfer function in the following frequency regions: (a)
ωω1 (b) ω1 ωω2 (c) ωω2
Vo
FigureP2.93
Use these approximations to sketch a Bode plot for the magnitude
response. Observe that the circuit performs as an amplifier whose
gain rolls off at the low-frequency end in the manner of a
high-pass STC network, and at the high-frequency end in the manner
of a low-pass STC network. Design the circuit to provide a gain of
40 dB in the“middle-frequencyrange,”alow-frequency3-dBpointat
200Hz,ahigh-frequency3-dBpointat200kHz,andaninput resistance (at
ωω1) of 2 k.
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Derive the transfer function of the circuit in Fig.P2.93(foranidealopamp)andshowthatitcanbewritten in the form Vo Vi = −R2/R1...
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