Do class F amplifiers work in linear mode or CCM?

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SUMMARY

Class F amplifiers operate primarily in saturation and cutoff modes, rather than linear mode. The design of these amplifiers aims to minimize power loss during switching, which occurs when the transistor is not fully on or off. For power levels between 10W and 25W, understanding the operational characteristics of Class F amplifiers is crucial for efficient performance. The reference paper from Cree provides in-depth insights into the behaviors of Class F and Class F1 amplifiers.

PREREQUISITES
  • Understanding of Class F amplifier design principles
  • Knowledge of transistor operation in saturation and cutoff modes
  • Familiarity with power levels in RF applications
  • Basic concepts of amplifier efficiency and power loss
NEXT STEPS
  • Read the Cree paper on Class F and Class F1 amplifiers for detailed operational insights
  • Explore the design considerations for Class F amplifiers at 10W to 25W power levels
  • Investigate the impact of switching losses in RF amplifiers
  • Learn about alternative amplifier classes and their efficiency characteristics
USEFUL FOR

Electrical engineers, RF designers, and anyone involved in the design and optimization of Class F amplifiers for efficient power amplification.

Fawkes
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Hey guys, I am dealing with a slight issue here, I am learning the basics of class F amplifiers. but I am not able to understand that whether the transistor in class f operation works in linear mode or current control mode? Also i am dealing this problems at power levels of 10W to 25W scales, if it matters...

any help is much appreciated. Thanks in advance.
 
I'm not sure what you mean by current control mode, but the whole point of class F amplifiers is for the switch to be saturated (fully on) or cutoff (fully off). Any time spent in actual linear mode (for example, while switching) creates wasted power.

This will probably tell you way more than what I know.

http://www.cree.com/~/media/Files/Cree/RF/Papers%20and%20Articles/102Behaviors_of_ClassF_and_ClassF1_Amplifiers.pdf
 
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