Part I: Give a short answer for the following questions in the space
provided
1. Write at least five comparisons of an ideal and practical operational amplifier (Op-amp)
characteristics? [5pt]
2. Define the following terms of Op-Amp characteristics [5pt]
a. Open loop gain
b. Bandwidth
c. CMRR
d. Input bias current
e. Slew rate
3. Define the Barkhausen’s criterion for oscillators? [2pt]
4. Define and sketch the output wave forms of the three types of multivibrators? [3pt]
Part II: Show all necessary steps clearly
1) Find the output voltage when the input voltages shown in Figure 1 are applied to [9pt]
a. The scaling Amp. What is the current through Rf?
b. The unity gain amp
c. Averaging Amp and find the closed loop gain for the averaging amplifier
Fig. 1
2) Determine the output voltage for the network given in figure 2 below? [6pt]
Fig. 2
3) What value of Rf is required in Figure given below? What is the resonant frequency,
fr? [4pt]
Fig. 3
4) A 1mH inductor is available. Choose the capacitor values for a Colpitts oscillator so
that f=1MHz and feedback gain β=0.25. [4pt]
5) A. An Astable 555 Oscillator is constructed using the following components, R1 =
1kΩ, R2 = 2kΩ and capacitor C = 10uF. Calculate the output frequency from the 555
oscillator and the duty cycle of the output waveform. [5pt]
B. Determine the output frequency for monostable 555 oscillator which can be charged
through R1. [2pt]