You are asked to design and build several oscillator circuits that perform at various frequencies. You have ‘TL084CN’ op-amps, ‘KSP2222A’ transistor, a 4MHz crystal, and plenty of capacitors and resistors of the following set of values. Table of Available Resistors (all values are in kΩ) 0.47 4.7 470 0.22 2.2 22 1 10 100 1000 0.33 3.3 33 1.5 15 0.68 6.8 2.2-kΩ potentiometer 10-kΩ potentiometer Table of Available Capacitors (all values are in F) 10p 22p 47p 100p 220p 470p 1n 10n 22n 47n 100n 1μ 2.2μ 4.7μ 10μ 22μ 47μ 100μ 220μ 470μ 3-A) Compare between the phase-shift oscillator and the Wien Bridge oscillator in terms of the feedback circuit, resonant conditions, forward gain conditions, and advantages. For each oscillator type, design a circuit that oscillates at ~10 kHz by using the op-amp IC and the available resistors and capacitors
Activity 3:
You are asked to design and build several oscillator circuits that perform at various frequencies.
You have ‘TL084CN’ op-amps, ‘KSP2222A’ transistor, a 4MHz crystal, and plenty of capacitors
and resistors of the following set of values.
Table of Available Resistors (all values are in kΩ)
0.47 4.7 470 0.22 2.2 22 1 10 100 1000
0.33 3.3 33 1.5 15 0.68 6.8
2.2-kΩ potentiometer 10-kΩ potentiometer
Table of Available Capacitors (all values are in F)
10p 22p 47p 100p 220p 470p 1n 10n 22n 47n
100n 1μ 2.2μ 4.7μ 10μ 22μ 47μ 100μ 220μ 470μ
3-A) Compare between the phase-shift oscillator and the Wien Bridge oscillator in terms of the
feedback circuit, resonant conditions, forward gain conditions, and advantages. For each
oscillator type, design a circuit that oscillates at ~10 kHz by using the op-amp IC and the
available resistors and capacitors
3-B) Build the Wien Bridge oscillator in MultisimTM. Record your findings and include screen
shots in your report. Compare your simulation findings with theory, and explain
discrepancies.
3-C) Describe the operation of Colpitts oscillator and explain its advantage over RC oscillators.
What is a typical application of such an oscillator?
3-D) Explain the advantages of using a crystal in oscillator circuits.
3-E) Describe the operation of the following oscillator circuit. What is the main characteristic
of its output? and what is its possible applications?
3-F) Build the circuit of part (E) in MultisimTM. Record your findings and include screen shots
in your report. Suggest one modification to increase the frequency of the output
waveform.
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