POWER RF AMPLIFIERS TECHNICAL REFERENCE MATERIAL
Class A Operation
Class A amplifiers have a fixed forward bias.
Base current, IB, and collector current, IC, flow over the full RF cycle.
In addition, when operated below compression, the RF signal swing is uniformly above and below the quiescent DC
bias set point and well within the linear region of the transistor.
Summary of Characteristics Class A
Class A Advantages:
Faithful Pulse Response Below the 1 dB Compression Point
Good Noise Figure
Low Bandpass Ripple at All Output Levels
Medium Output Power Capability
Phase & Gain Stable at All Output Levels
Class A Disadvantages:
More Heat Dissipated
Sweeper/Synthesizer/Signal Generator Boosters
Short Pulse Amplifiers
IF and Low Noise Amplifiers
Multi Decade Amplifiers
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