TAMPERE UNIVERSITY OF TECHNOLOGY
Institute of Communications Engineering
TLT-8016 Basic Analog Circuits
Problem
Max. Points
1
2
3
4
5
Total:
10
10
10
10
10
50
Result
2005/2006
Examination 2
13.03.2006
Family Name:
Given Name:
Student Number:
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Final Mark:
Please, write your answers in English.
BEST WISHES FOR SUCCESSFUL WORK & RESULTS !
TLT-8016 Basic Analog Circuits
2005/2006
Examination 2
Problem 1
13.03.2006
10 pt.
Define briefly the following terms and answer shortly to the questions (1pt per correct answer):
1. Input impedance;
2. Output impedance;
3. Voltage gain;
4. Ideal voltage amplifier;
5. Ideal current amplifier;
6. Draw the circuit symbol of an NMOS transistor and show its terminals;
7. Common-mode rejection ratio (CMRR);
8. Low-pass, high-pass and band-pass filter;
9. Analog-to-digital converter;
10. Digital-to-analog converter.
2
TLT-8016 Basic Analog Circuits
2005/2006
Examination 2
Problem 2
13.03.2006
10 pt.
A source with internal voltage Vs = 1mV rms and internal resistance of Rs = 1MΩ is connected to the
input terminal of an amplifier having an open-circuit voltage gain of Avo=104, and input resistance of
Ri=2MΩ, and an output resistance of Ro= 2Ω. The load resistance is RL = 2Ω. Find the voltage gains
Avs=Vo/Vs and Av = Vo/Vi . Also, find the current gain and power gain.
3
TLT-8016 Basic Analog Circuits
2005/2006
Examination 2
Problem 3
13.03.2006
10 pt.
Determine the values of α and β for the BJT with the characteristics shown in Figure 3.1.
α=
β
β +1
Figure 3.1
4
TLT-8016 Basic Analog Circuits
2005/2006
Examination 2
Problem 4
13.03.2006
10 pt.
Assuming identical npn transistors design a 1mA current mirror. The supply voltage is VCC = 15V. Plot
the circuit of the designed current mirror.
5
TLT-8016 Basic Analog Circuits
2005/2006
Examination 2
Problem 5
13.03.2006
10 pt.
A certain integrated-circuit operational amplifier has a single pole in its gain function. The open-loop dc
gain is A0 = 105 and the open loop break frequency is fb = 10Hz. Prepare magnitude Bode plots for A(f)
and Af(f) if β = 0.01; 0.1 and 1.
The formula for the half-power break frequency of an amplifier with feedback is:
f bf = f b (1 + A0 β )
6