University of California, Berkeley Extension
Professional Sequence in Semiconductor Technology Fundamentals
EL ENG X480: Introduction to Microelectronics
(1 semester unit in EL ENG, Online Format)
Homework 1
Homework Instructions:
A. Due date
This homework should be submitted within 30 days from your registration date.
B. Pacing yourself
You are expected to study 30 percent of the lectures before submitting this homework.
Timeline
Day 30
Day 60
Day 90
Day 90
Day 120
Day 120
Day 150
Day 180
C. Submitting format
Acceptable format:
Course events
Homework 1
Homework 2
Homework 3
Final exam request
Midterm exam
Final exam date confirmed
Proctored final exam
Course end
Lecture pace
30% of lectures done
60% of lectures done
90% of lectures done 100% of lectures done
Review Lecture access expires
Using PDF or Word as attachments.
Hand-writing, scanning and converting into PDF format is acceptable.
Preferable format: (See Homework Example)
PDF with the bookmarks indicating Prob.1, Prob.2, etc.
Displaying bookmarks for initial view.
D. Computer simulation tool
Install Cadence® PSPICE® AD Demo in your computer before starting this homework.
See the related links in the Classroom for the Cadence OrCAD Demo CD request or software
download.
[EL ENG X480: Introduction to Microelectronics Homework 1] Page 1
E. Note
Pacing yourself well is one of the key successful factors for personal growth.
Email the instructor if you have some urgent matters and can’t complete this homework by the
due date.
[EL ENG X480: Introduction to Microelectronics Homework 1] Page 2
1. Basic Circuit Theories for Microelectronics
The following figure shows a resistive network which consists of two dc sources (batteries) and six resistors.
1
20 2 6 3 5 4
I1 20
20
46V
40V
5 10 0
(a) Transform the original diagram into the following circuit and then determine IA and RA within the orange zone.
IA
(b) Transform the result in (a) into the following circuit and then determine VB and RB within the blue zone.
RB
VB
[EL ENG X480: Introduction to Microelectronics Homework 1] Page 3
1
46V
20 2 6 3
5 10 0
RA
20
20
1
46V
20 2 6 3
5 100
20
(c) Transform the result in (b) into the following circuit and then determine IC and RC in the pink zone.
IC
(d) Transform the diagram in (c) into the following circuit and then determine VD and RD in the green zone.
1
46V
20 2
5
RC
20
20 2 46V
5
1
I1
RD
VD
(e) Find the current I1 and the voltage at the node 2.
[EL ENG X480: Introduction to Microelectronics Homework 1]
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Special note:
Install Cadence® PSPICE® AD Demo in your computer before moving forward to the next question.
See the related links in the Classroom for the Cadence OrCAD Demo CD request or software download.
2. SPICE Verification
Use SPICE to simulate the resistive network in Prob. 1 and compare the results with hand-analysis ones. Suppose the voltage at node 0 is defined as zero (ground).
1
20 2 6 3 5 4
I1 20
20
46V
40V
5 10 0
Note: Refer to SPICE Circuit File (Deck/Code) and SPICE Quick Guide 1.
(a) After running simulation, view the Output File and search something like this: VOLTAGE SOURCE CURRENTS
NAME
V1
V2
CURRENT
-1.000E+00 -1.840E+00
What’s the missing current shown in the above data? The direction of this VOLTAGE SOURCE CURRENT is defaulted as the one flowing into the voltage source V1 (46V-battery). In other words, the positive current would appear if the current passes from the anode to the cathode inside the 46V-battery. Can your result in Prob. 1(e) reconcile with this simulated result.
[EL ENG X480: Introduction to Microelectronics Homework 1] Page 5
(b) After running simulation, view the Output File and search something like this:
**** SMALL SIGNAL BIAS SOLUTION TEMPERATURE = 27.000 DEG C ******************************************************************************
NODE
( 1)
( 5)
VOLTAGE NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE 49.0000 ( 2) 29.0000 ( 3) 30.8000 ( 4) 40.0000
3.0000
What’s the voltage at node 2? Is this result the same as the one in Prob. 1(e).
(c) Based on the five simulated node voltages listed above, use hand analysis to determine the current
I2, I3, I4, I5, and I6.
1
20 2 6 3 5 4
I1 20
I3
I2 20
I6
46V
40V
5 10 0
I5 I4
(d) Compare the calculated current I5 with the current flowing into the voltage source V2 (40V-battery). Again, the current corresponding to the voltage source V2 current listed below passes from the anode to the cathode inside the 40V-battery.
(e) Based on the following formula,
Calculate the individual power dissipation upon each of the six resistors.
(f) Calculate the total power dissipation by adding up the power dissipated on the six resistors together.
[EL ENG X480: Introduction to Microelectronics Homework 1]
P VI (IR)I I 2 R
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(g) View the Output File and search something like this: VOLTAGE SOURCE CURRENTS
NAME
V1 V2
CURRENT
-1.000E+00 -1.840E+00
TOTAL POWER DISSIPATION 1.——20E+02 WATTS Compare the simulated total power dissipation with the one in (f).
SPICE Circuit File (.cir file or Input File or SPICE Deck or Code)
A Resistive Network
* node 1: Anode of 46V-battery
* node 5: Cathode of 46V-battery * node 4: Anode of 40V-battery
* node 0: Cathode of 40V-battery * circuit description
V1 1 5 DC 46V
V2 4 0 DC 40V
R1 1 2 20
R2 2 5 20
R3 2 3 6
R4 3 0 20
R5 3 4 5
R6 5 0 10
.OP
.end
Quick Tutorial:
.OP
The operating point analysis command .OP to conduct dc analysis for the circuit.
[EL ENG X480: Introduction to Microelectronics Homework 1]
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SPICE Quick Guide 1
Step 1: Create Circuit File
>Open PSPICE AD Demo
>File>New>Text file
>Type in the input file (SPICE code) in the main window
>Save.
1. “File name”: Add .cir followed by your assigned file name—RNetwork. That is, the file name should be “RNetwork.cir”.
2. “Save as Type”: Make sure you choose the “.cir” in the Save as type. Step 2: Run
>File>Open>Select the folder where the .cir file is stored.
>Choose .cir in the “Files of Type” and click Open
>Simulation>>Run
Step 3: View the Output File
>View
>Output file
1. Check if there is an ERROR in the output file
2. Check if the dc operating point or other related data makes sense.
[EL ENG X480: Introduction to Microelectronics Homework 1]
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