Pulse shaping, as it is done today, is an effort to fix fidelity issues caused by the transmitting amplifier and is accomplished by a combination of imperfect methods, most external to the amplifier. This industry brief explains a new approach.
Here’s the problem to be solved. High power amplifiers do a poor job duplicating the input signal without distortions. Due to the transient response of the amplifier the output will over shoot, ring and droop, introducing undesired low and high frequency components into other parts of the spectrum. By using a digital feedback loop within the rf chain, the amplifier issues can be fixed where they occur, within the amplifier, eliminating the need for external pulse processing.
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