Operational Amplifier - PowerPoint

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Operational Amplifier

Executive Diploma In Electronics
    & Electrical Technology
       14 & 15 Dec 2009
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                    Operational Amplifier
     Executive Diploma In Electronics & Electrical Technology


Q1. (a)
 i) Based on circuit, determine V1, I1, I2, R.




                                                            (2m)
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                    Operational Amplifier
     Executive Diploma In Electronics & Electrical Technology


Q1. (a)
 ii) Determine the collector
 current Ic flowing in the
 circuit in figure 1. Assume
 the current gain (β) for the
 transistor is equal to 50.




                                                            (2m)
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                    Operational Amplifier
     Executive Diploma In Electronics & Electrical Technology


Q1. (b)
 Describe about basic transistor amplifier (common emitter
 amplifier)
                                                                (4m)
Q1. (c)
 What you understand about:

 i) Analog and Digital Electronic

 ii) Amplifier

 iii) PSPICE / SPICE
                                                            (4m x3)
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                     Operational Amplifier
      Executive Diploma In Electronics & Electrical Technology


Q2.
Describe about the follows:

i) Ideal Op Amp.

ii) Feedback

iii) Filter

iv) Oscillator

v) Comparator
                                                             (4m x5)
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                   Operational Amplifier
    Executive Diploma In Electronics & Electrical Technology


Q3. (a)
 i) Assuming an ideal op-amp, determine V (out)




                                                           (2m)
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                   Operational Amplifier
    Executive Diploma In Electronics & Electrical Technology


Q3. (a)
 ii) Assuming an ideal op-amp, determine the closed loop gain.




                                                           (2m)
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                    Operational Amplifier
     Executive Diploma In Electronics & Electrical Technology


Q3. (b)

 What you understand about:

 i) Analogue Digital Converter (ADC).

 ii) Instrumentation amplifier




                                                           (4m x 2)
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                    Operational Amplifier
     Executive Diploma In Electronics & Electrical Technology


Q3. (c)
 I) Sketch the output voltage waveform for following circuit




                                                            (2m)
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                              +
                    Operational Amplifier
     Executive Diploma In Electronics & Electrical Technology


Q3. (c)
 iI) Sketch the output voltage waveform for following circuit




                                                            (2m)
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                   Operational Amplifier
    Executive Diploma In Electronics & Electrical Technology


Q3. (d)

 Design a band-pass filter using LM741.




                                                          (4m)
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                   Operational Amplifier
    Executive Diploma In Electronics & Electrical Technology


Q4. (a)
 Design (and explain) an audio mixer for band-equipment. (Use
 Op Amp)

 The scenario as bellows:

 This audio mixer consists of 8 channels with audio volume
 control. These 8 channels can be mixed the audio from various
 instruments’ source like lead guitar, bass guitar, drums,
 keyboards, microphone and so on.



                                                           (10m)
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                   Operational Amplifier
    Executive Diploma In Electronics & Electrical Technology


Q4. (b)
 Design (and explain) an automatic system for fish pond. (Use
 Op Amp)

 The scenario as bellows:

 The fish pond has an instrument to measure the dissolved-
 oxygen level and a motor to generate water flow for increase
 dissolved-oxygen level on water. The control system must be
 enabled to:
 - Turn on water pumps when dissolved-oxygen level on critical
 (such as 4 ppm, pre-set value)
 - Turn off water pumps when dissolved-oxygen level back to
 normal (such as 6 ppm, pre-set value)                  (10m)
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                    Operational Amplifier
     Executive Diploma In Electronics & Electrical Technology


Q5. (a)


TM Malaysia providing an internet service named as Streamyx.
According to TMnet, the customer can use the internet and
telephone at same time. Describe, or explain (in term of
electronic) how TMnet Streamyx works.




                                                            (10m)
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                    Operational Amplifier
     Executive Diploma In Electronics & Electrical Technology


Q5. (b)


Describe the difference between analogue computing and digital
computing
                                                           (4m)
Draw any 2 analogue mathematic computing circuit (Op-Amp).
other than summer and subtraction circuit.


                                                            (3mx2)

				
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