By Pat Hawker, D.E. Cole
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Extra info for Amateur Radio Techniques
In each stage, a certain amount of power is consumed, which in turn adds up to the overall power consumption. Low gain of the power amplifier therefore increases the overall power consumption, thus decreasing the overall efficiency (Kenington, 2000). 1 Nonlinearity of Power Amplifiers There are three regions for a power amplifier with amplitude dependent characteristics (AM-AM). 1. Cutoff region—The region where the amplifier is not conducting any amplification. 2. Linear region—The region where the amplifier starts amplifying the input signal.
The voltage level shown here is the maximum voltage output that could be amplified by the power a mplifier. Gain compression happens until maximum power is achieved. This power amplifier saturation also causes phase modulation of the signal. The main characteristics of a power amplifier are as follows: • Second-order intercept point—The point where the second harmonic signal clashes with the first-order ideal linear response. The second harmonic signal increases in reference to the input signal by the order of two.
Digital predistortion among all linearization techniques is the one that is low in cost, one with high efficiency and also high flexibility. By applying digital predistortion, which is implemented in the baseband of the communications system, the nonlinearity of the power amplifier is reduced and it allows the use of a high power amplifier with high efficiency in the system. Another important fact in the study of PAs is memory effects, which are the main issue of this book. The focus here is on shortterm memory effects, which cause the characteristics of PAs to vary with time.
Amateur Radio Techniques by Pat Hawker, D.E. Cole