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Course CO27-300222 – Electronics Lab
Final Homework – Spring 2020
Last Name :
First Name:
Rules for execution and delivery :
The exam is like a PreLab. Deliver the solution as a normal lab
report as *.PDF le.
Show all circuit diagrams with all simulation commands from
LTSpice and -meaningfull- output plots.
Show a proof for every solution. Either as calculation or if possible
as (short) explanation.
Calculations with full formula, derivations, numbers and
units (and of course the result)!
Editing time is one weekend. Submit the report and all
simulation les. Missing *.asc les for a problem will subtract
20% for this single task!
Submission of the whole report latest on Monday morning 8:00.
Anything later counts as 0% (strict!!!!!).
Question 1 :
Design a DC power supply with minimum output voltage Vout = 6V
using a half wave rectier. The output ripple should be 1V at a
maximum load of RL = 100
!
Task(s):
1. Draw the circuit diagram in LTspice. Use a ‘MURS320’ Diode
from the LTSpice library as rectier. The source should have a
series resistance of 0:01
.
2. Determine the smoothing capacitor. Show the complete calculation
in the report. Use the calculated capacitor value in the following
simulations.
3. Simulate the circuit. Show meaningful plots to demonstrate the
proper function of the circuit!
4. Determine the RMS and Ripple voltages using the LTSpice .measure
command! Add a table with all values to the report.
5. Give a statement if the requirements are fullled.
6. What happens if the load resistor is varied from 50
to 150
. Is
there a sucient margin for the ripple with lower RL? Use the
LTSpice simulation to give a statement!
7. Show the complete Circuit diagram with all dot commands in
your report. Attach the *.asc le to your submission.
1
Question 2 :
Compute the DC setup for the following circuit.
I_q
Vs
20V
T1
2N2907
R1 R_L
R2
I_C
BZX84C6V2L
D1
Assume = 150, VCEsat = 0:2V and VBE = 0:7V .
Requirements: Iconst 10mA and Iq 5 to 10mA
Task(s):
1. Calculate the resistor values for R1 and R2.
2. Simulate the circuit and verify the setup using the calculated
resistor values. All components are available in the standard
libraries!
3. Give a statement about the result. What is dierence between
calculation and simulation?
4. Determine the maximal resistance for RL.
5. Vary the load resistor RL from 10
to 4k
to nd the maximum
RL (.step!). Show the LTspice plot in the report.
6. Show the complete Circuit diagram with all dot commands in
your report. Attach the *.asc le to your submission.
2
Question 3 :
Given is the following circuit:
R1
50R
+V
15V
-V
15V
C1
100nF
R3
1M00
R2
1K00
C3
100nF
+V
15V
-V
15V
V1
15V
V2
15V
C2
100nF
V_in= sine
250mVpp
100 to 1kHz
V_out
U1
Lt1007A
+
–
~
Task(s):
1. Simulate the above circuit. The opamp is from the LTspice
library. Create the Bode plot of the output voltage for a frequency
range of 100Hz to 10kHz.
2. Show the bode plot in the report. What is the function of the
circuit?
3. Calculate the gain of the amplier at 100Hz.
4. Calculate the frequency when Gain = 1 = 0dB?
5. Determine the gain of the amplier from the Bode plot at 100Hz
and 10kHz. What is the frequency when Gain = 1 = 0dB?
Hint: The dB value shown in LTSpice is -NOT- the gain.
dB values are relative to 1V
6. Show the complete Circuit diagram with all dot commands in
your report. Attach the *.asc le to your submission.
3