Engineering Notes
POWER RF AMPLIFIERS TECHNICAL REFERENCE MATERIAL
Class AB Operation
Class AB Amplifiers have a small forward DC bias, IB. The collector current, IC,
(without RF drive) may be 1 % to 10% of the maximum design value.
As the RF drive is increased, the base bias (IB) and the collector current (IC) are
increased proportionally.
Summary of Characteristics Class AB
Class AB Advantages:
Multikilowatt Output Power
Good Efficiency
Compact Size
Good Linearity
Low Distortion
Broad Bandwidth
Relatively Cool Operation
CW, AM, FM, TV, Phase and Pulse Amplification
Class AB Disadvantages:
Limited Dynamic Range (15 to 30 dB)
Restricted IMD Characteristic
Higher Bandpass Ripple at Low RF Input Levels
Applications:
ECM/EW Jammers
Booster Amplifiers
Transmitters
RFI/EMI Testing
High Power TWT Replacements
Visual Television Amplifiers
High Power Calibration Testing
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