1. EC302 – Electronic Computer
Aided Design
MOHD AT-TARMIZI BIN ABU HASSAN
013-3507201
2. FIRST WARNING !!!
• NO excuse for who come late to my class
• NO reconsider for any marks given
• NO empty-talk in my class
• NO delay assignments submitting
• NO inappropriate wear
• NO hang around in my class
• NO stupid talk
4. CAD = Computer Aided Design
• modeling of physical systems on
computers
• allowing both interactive and automatic
analysis of design variants
• expression of designs in a form suitable
for manufacturing
* Also known as CADD (Computer Aided Design & Drafting)
8. Type of Simulation
• DC Analysis
• DC Sweep Analysis
• AC Analysis
• Transfer Function Analysis
• Transient Analysis
9. DC Analysis
• Determination of steady-state response of
the circuit when time-invariant DC sources
are applied.
10. DC Sweep Analysis
• Determination of response of the circuit
when excitation, or any other component
is varied over a range.
11. AC Analysis
• a.k.a Frequency Domain Analysis
• Determination of steady-state response of
the circuit when sinusoidal excitation is
applied mine the frequency response of
the circuit.
• The frequency of excitation can be varied
to determine the frequency response of
the circuit.
12. Transfer Function Analysis
• Determination of small-signal transfer
function with small-signal gain, input
impedance, output impedance.
13. Transient Analysis
• a.k.a Time Domain Analysis
• Determination of variation of response of
the circuit with respect to time.
14. Advantages of Simulation
• able to provide users with practical
feedback when designing real world
systems
• study a problem at several different levels
of abstraction
• can be used as an effective means for
teaching or demonstrating concepts to
students
15. Disadvantages of Simulation
• computationally intensive processing required by
some simulators
• restricted by limited hardware platforms which
cannot meet the computational demands of the
simulator
• introduce simplifying assumptions or heuristics
into the simulator engine
• computational complexity is to employ the
hierarchical approach to design and simulation
17. Design and Simulation Process
Identify Project - A project or circuit to be designed is identified
Design / Redesign Project - The project/circuit is designed based on theory
Fail
- The project designed is simulated using software
Simulation package to produce results/outputs of the
project operation
- See whether the project actually works as in
Testing
simulation
- The printed project/circuit board layout is
PCB Design Layout
designed and produced
- An actual working model of the project is
Prototype
constructed
19. Source element
• The sources functions to supply the circuit
with power supply or input waveforms.
There are THREE (3) different types of
sources used in simulation
- DC Source
- AC Source
- Transient Source
20. DC Source
• A source that generates dc voltage and dc
current
• There are two types of dc sources:
– dependent source
– independent source
21. AC Source
• A source that generates sinusoidal
waveforms at different frequencies with
the same magnitude
22. Transient Source
• A source that generates waveform whose
amplitude changes with time
• Examples of transient sources are:
- Sine Waveform
- Pulse Waveform
- Polynomial Waveform
- Exponential Waveform
23. Passive Device Element
• Passive elements are electronic passive
components
• Example:
- Resistor
- Capacitor
- Inductor
- Transformer
24. Active Device Element
• Active device elements are electronic
components made of semiconductor
material
• Examples :
- Diode
- Bipolar Transistor (BJT)
- Field-Effect Transistor (FET)
- Integrated Circuit (IC)
25. Why do we need to simulate
• A simulation is not used to figure out how
a circuit works
• It is important to know the theory of your
design before you simulate
26. Why do we need to simulate
• In the verification process, results
generated by the simulation package will
give information about the designed circuit
27. Output in verification process
• Circuit Output - voltage distribution, current flow,
waveforms, frequency response curve, switching
speed in digital circuits
• circuit operation sensitivity towards change in
other component values
• change in circuit characteristics due to
temperature change
• circuit elements parameters could be modify for
optimum operation
29. QUIZ 1
• Give at least FOUR (4) types of
simulation.
• Draw the flow chart for simulation process.
P/S : Don’t forget to write down your
name, reg. no, i/c no, class, and
assessment no.
30. LAST WARNING !!!
• NO excuse for who come late to my class
• NO reconsider for any marks given
• NO empty-talk in my class
• NO delay assignments submitting
• NO inappropriate wear
• NO hang around in my class
• NO stupid talk
