Welcome to the
ECEN 325 LAB!
TA: Younghoon Song (john)
Office Hours: T & R 10-11am
Office : WBRC 114
Important!
• To run PSPICE simulations in the ECE Department
computers you have to temporarily save your files (Eg.
schematics) in the computer desktop.
ECEN 325
Lab 1: Network Analysis and Bode plots
By: Joselyn Torres
Part A
Build the following circuit:
CH2+ (Red)
CH1+(Red)
CH2-(Black)
CH1-(Black)
R = 1026  1K
C = 47nF
f-3dB  3.3KHz
High Z Option:
•
•
•
•
•
First, press “Shift” then “Enter” ( You should see “A: MOD MENU”)
Then, press “>” three times until you find “D: SYS MENU”
Next, press “v” twice until you find “50 Ohm”
Then, press “>” once until you see “High Z”
Finally, press “Enter”
Measurements
Approach 1: Measure t with the cursors
 Phase = 360 * t * Frequency (Function generator)
Approach 2: Measure the  Phase
Frequency
Amplitude
Phase
330Hz
?
?
500Hz
?
?
1K
?
?
2K
?
?
3KHz
?
?
3.3KHz
?
?
4KHz
?
?
10KHz
?
?
20KHz
?
?
33KHz
?
?
Part B (Instructions)
• Go to : Program => HP BenchLink Suite => HP BenchLink Arb
• Go to: =>Options
=> Configure Interface
=>Interface: National Instruments AT-GPIB or GPIB-PC2
=> Instruments: HP33120A Waveform Generator Address 10
=> press Ok
• Then just follow the instructions in the manual
Part C
Build the following circuit:
CH2+ (Red)
CH1+ (Red)
R1 = 967.5  1K
R2 = 96.75K  100K
C = 47nF
CH1- (Black)
CH2- (Black)
Instructions:
1. Apply a 6Vpp sinusoid from the function generator to the input
2. Find the -3dB signal attenuation frequency f-3dB (this the point where the output amplitude is
0.707 times the input amplitude, e.g. if the input is 6Vpp the output voltage should be 4.24V)
3. Find the -40dB signal attenuation frequency f-40dB (this the point where the output amplitude is
0.01 times the input amplitude, e.g. if the input is 6Vpp the output voltage should be 60mV)