M i d - T e r m T e s t R e v i e w

X M U T 3 0 3 A n a l o g u e E l e c t r o n i c s

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M i d - t e r m Te s t

2 Hours

Bring calculator and dictionary

4 Questions, 25 marks each

Time and Place: T. B. A.•

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Q u e s t i o n T y p e s

Expect 3 types of question in the test:

• Explain…(a) [5 marks] Two common classes of operational amplifiers use BJTs and JFETs as their input

devices. Explain why you would choose one or the other.

• Calculate…(b) [5 marks] Show that the output voltage, vO, can be expressed in terms of the input

voltages, v1 and v2, as

• Design…(c) [10 marks] Design and sketch an external nulling circuit to remove the expected offset error.

R2 (R1 + R2) R4vO v1 + v2.

R1 (R3 + R4) R1

= −

Topics

1. Operational Amplifiers2. Op Amp Analysis3. Op Amp Circuits I 4. Op Amp Circuits II

1. Operational Amplifier (Lab)

• Amplifiers; ∫,∂-ers; filters; ∑,∆-ers

• Measuring Zin, Zout, freq. response

• Colour & numerical codes for passives

• PSU, function generator, oscilloscope, multi meter, and breadboard operation

1. Operational Amplifier• Nodal analysis: 𝐴𝑣 , 𝑍𝑖𝑛 , 𝑍𝑜𝑢𝑡• Differential vs Common Mode

• Circuit Topologies

T1 R1 R2

vI vO

R1R2

v1 vo1 R1 R2

R3

RGvO

R3

v2vo2 R1 R2

2. Op Amp Analysis

• Op amp internals

• Dynamic Imperfections

• Static Imperfections

Input

C

High

Gain

Output

• Nulling

2. Op Amp Analysis

• Feedback

• ROC, Peaking, Ringing

• Compensation

• Loading

3. Op Amp Circuits I

Basic Op Amp Circuits:• Inverting amplifier• Non-inverting amplifier• Voltage follower• Summing amplifier• Integrator/Differentiator• Differential amplifier• Instrumentation amplifier

4. Op Amp Circuits II

• Comparator (hysteresis, thresholds)

4. Op Amp Circuits II

• Rectifier (half-wave, full-wave)

4. Op Amp Circuits II

• Analogue Switch (applications)

4. Op Amp Circuits II• Oscillators (Wien-Bridge)

4. Op Amp Circuits II

• Amplifiers (Current to Voltage Amplifier)

4. Op Amp Circuits IIFilters• Cut-off frequency• Bandwidth• Q-factor

4. Op Amp Circuits II• Passive Filters:• Low Pass• High Pass• Band Pass• Band Stop

4. Op Amp Circuits II•Active Filter• V-buffer• Sallen-Key• VCVS• Bi-Quad• Multiple Feedback

R1

R2

R4

R4

R4

R3

C

C

ViVo