EE2301 Basic Electronic Circuits
Problem Set 4 (Block B Unit 1)
Review on Operational Amplifiers
Q1 [Modified from Rizzoni Problem 8.4]
With reference to the Figure P8.4 that shows an ideal op amp model,
I1
I2
Figure P8.4
a) What approximations are made a
Solving with sinusoids is complex
Solving with complex numbers makes things simpler
+ vc(t) +
vs = Vs cos t
C
vc = Vc cos(t + )
R
vs(t)

Define voltages as sinusoids
ic(t)
IV relation for C
dvc (t )
dt
= CVc sin(t + )
ic = C
Apply KVL around loop
vs(t)
Frequency response
Changing the frequency affects the currents and voltages in a circuit
This is due to changes in the impedances of the various components in a circuit
This affects the working frequency range of a particular device or circuit
Hence it is
EE2301 Basic Electronic Circuit
Block B
Operational Amplifiers
G. Rizzoni Ch 8.2
Summary
If an output of a sensor was 1mV, which is the smallest
your DMM could measure, you will need to amplify the
voltage for it to be detectable by the DMM. The effect
yo
EE2301: Basic Electronic Circuit
Short Notes on Complex Numbers
Short Notes
The imaginary number
An imaginary number carries the symbol of j. In engineering, we typically use j to represent
an imaginary number (instead of i, so as not confuse with the sym
Block D  Unit 2 Outline
Field Effect Transistors (FETs)
Junction FETs
Structure and working principle (Pinchoff voltage, VP)
Operating modes
JFET amplifiers and biasing points
Small signal equivalent circuit for JFET amplifiers
Structure and working p
Block C Unit 1 outline
AC circuit components
capacitors
inductors
Key concepts in this unit
Sinusoids (frequency, amplitude, phase)
Instantaneous and Average power
Phasors and Complex numbers
Impedance and Admittance
G. Rizzoni, Fundamentals of EE
EE2301 Basic Electronic Circuit
Block A: Unit 3
One port networks and Dependent Sources
G. Rizzoni Ch 3.6, 3.5
Block A: Unit 3
To see the motivation for this unit, let us first refer to
the circuit shown below:
Fig 1: An example of a one port network
If y
Block D Unit 1 Outline
Semiconductor materials (eg. silicon)
Intrinsic and extrinsic semiconductors
How a pn junction works (basis of diodes)
Large signal models
Ideal diode model
Offset diode model
Finding the operating point
Application of diod
EE2301 Basic Electronic Circuit
Block B
Operational Amplifiers
G. Rizzoni Ch 8.2
Summary
If an output of a sensor was 1mV, which is the smallest
your DMM could measure, you will need to amplify the
voltage for it to be detectable by the DMM. The effect
yo
Block A Unit 2 outline
It is important to apply the 3 basic laws in
circuit theory to analyze and design circuits
This unit is organized into the following 3
sections
Nodal voltage analysis (application of KCL and
Ohms law)
Mesh current analysis (appl
Block B Operational Amplifiers
Why do we learn operational amplifiers?
If an output of a sensor was 1mV, which is the smallest your DMM
could measure
You need to amplify the voltage for it to be detectable by the DMM
Through the amplifier, the signal i
Block A Unit 3 outline
One port network
Thevenin equivalent circuit
Norton equivalent circuit
Source transformation
Dependent sources
Dependent voltage source
Dependent current source
Maximum power transfer
Alexander & Sadiku, Fundamentals of Elec
Block D  Unit 2 Outline
Field Effect Transistors (FETs)
Junction FETs
Structure and working principle (Pinchoff voltage, VP)
Operating modes
JFET amplifiers and biasing points
Small signal equivalent circuit for JFET amplifiers
Structure and working p