A) By Cascading a first-order op RC low-pass circuit with a first-order RC high-pass circuit, one can design a wideband bandpass filter. Design the filter for 3-dB bandwidth that extends from 200 Hz to 8 kHz. Select appropriate component values such that resistor values are between 10 k and 100 k. 1) Design 1: Add a voltage buffer (op amp with a gain of 1 V/V) between the LP and the HP circuits to prevent loading effect. 2) Design 2: Now add gain to the op amp (10 V/V) so that the filter midband gain is 20 B
A) By Cascading a first-order op RC low-pass circuit with a first-order RC high-pass circuit, one can design a wideband bandpass filter. Design the filter for 3-dB bandwidth that extends from 200 Hz to 8 kHz. Select appropriate component values such that resistor values are between 10 k and 100 k. 1) Design 1: Add a voltage buffer (op amp with a gain of 1 V/V) between the LP and the HP circuits to prevent loading effect. 2) Design 2: Now add gain to the op amp (10 V/V) so that the filter midband gain is 20 B
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Transcribed Image Text:A) By Cascading a first-order op RC low-pass circuit with a first-order RC high-pass circuit,
one can design a wideband bandpass filter. Design the filter for 3-dB bandwidth that extends
from 200 Hz to 8 kHz. Select appropriate component values such that resistor values are
between 10 k and 100 k.
1) Design 1: Add a voltage buffer (op amp with a gain of 1 V/V) between the LP and
the HP circuits to prevent loading effect.
2) Design 2: Now add gain to the op amp (10 V/V) so that the filter midband gain is
20 B
VEE
40
V-
UA741
C3
6.
OUD
Vout
R5
3
OS
V4
02 V+
1Vac
Ovdc
C4
VCc
VEE
V2
V1
-12Vdc
12Vdc
Figure 1. Bandpass Filter Circuit

Transcribed Image Text:B) Simulate the above circuits using Orcad capture pspice.
1- Run Orcad capture CIS, open a new project from the file menu, and choose Analog
or Mixed Signal circuit Wizard
2- Draw the circuit of Design land save it (remember to add a ground)
3- In Pspice, select a new simulation profile: AC Sweep/Noise, Logarithmic, Start
freq= 1, End frequency= 100k, points per decade= 100
4- Name the output node Vout and add a voltage marker to the output
5- Run the simulation to verify the bandpass filter output (this is Gain (V/V) vs freq. in
Hz)
6- In Probe, from the menu. Trace -→Add Trace, the in the space of trace expression,
type DB(V(Vout)). This is the plot of 20log(Vout/Vi) vs frequency. Adjust the DB
axis to be between -30 dB and 5 dB (by going to Plot--- axis settings-Yaxis-user
defined)
7- Using the cursor tools (toggle cursor icon), verify the midband gain, lower and upper
3dB frequencies (fi and fr), center frequency fe, and roll-off in dB/decade. This is
Plot #1.
8- Repeat for steps 2 to 7 for Design 2 (Adjust DB zxis settings between -20 dB and 30
dB). This will give you Plot #2.
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