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Summary of Class C amplifier design and matching networks

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Question:

In radio frequency (RF) circuits used for portable applications, power efficiency is extremely important. For this reason, Class C power amplifiers are used wherever practical. There are some limitations in using Class C amplifiers, as we discussed in class. Identify these issues. Another consideration for a power amplifier is efficient coupling of energy from the amplifier to the load. This generally requires an impedance matching network. Shown in the attachment are two circuits that could be used to match the amplifier output impedance to the load impedance. Ignoring tunability or component sizes, which is likely to be the best choice for a Class C amplifier? Why?

See attached for the circuit diagrams

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Solution Summary

Basic summary of the issues with using Class C power amplifiers for RF and a look into matching network designs for minimum output distortion

Solution Preview

Disadvantages of using Class C amplifiers

• Poor dynamic range, typically dynamic range lies between 0 to 6 dB
• Unsuitable for certain types of signal modulation especially AM signals
• High output distortion but usually with operation at a ...

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