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EEN3096 Communications Electronics Experiment CE1: Design of RF Class A Tuned Amplifier

Trimester 3 2001/2002 Session

Desmond Kho Teck Kiang 1001112325

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Objectives
• To familiarize with the practical aspects of the design of a Class A Tuned Amplifier. • To illustrate issues such as the choice of component, the biasing requirement and prediction of the circuit performance.


Results
(Numbering below is according to the lab sheet)


Discussion
Due to instrument error, there is a difficult to maintain the input voltage (V_B(pp)) with a value of 36mV. Hence, I try to do the experiment twice; once with fixed (V_B(pp)) to 36mV and once without fixed (V_B(pp)) to 36 mV. In order to maintain (V_B(pp)) with a value of 36mV, I need to keep on changing the amplitude of the function generator when its frequency changes. Besides, due to imperfection of component and stray capacitor, the values that I measured have error, and are slightly different with the measured value.


Conclusion
A lot of thing have to be consider when design a Class A Amplifier, e.g. the operating frequency range, input signal amplitude and etc. Hybrid-model for the transistor is essentially accurate and significant within a frequency range, it provides an easier way for us to design a good amplifier. However, a capability or accuracy of the amplifier is always limited by the imperfection of those passive elements and exists of stray capacitor at high frequency and effect of those coupling capacitor and bypass capacitors. After this experiment, I gain the basic knowledge of tuned Class A Amplifier and learn the way to design one. This experiment was proved successfully since the measured resonant frequency is approximate to the ideal value. I have designed the amplifier with fewer conductors as possible as I can with the shortest conductance paths (the wires).


Reference
Robert Boylestad, Louis Nashelsky, "Electronic Devices and Circuit Theory", 6th Edition, Prentice Hall, 1996.

To download this lab report, please right click here.