The Digital Linear Amplifier
This paper is the second of two presenting a contemporary approach to Digital Amplitude Modulation and Digital Linear Amplification. The first paper showed how full carrier amplitude modulation takes place in a cascade of 3-dB hybrid power combiners by gating the RF drive to power binary related coherent signal sources. This paper carries the Digital Amplitude Modulator concept to the general purpose Digital Linear Amplifier. The output is a distortion-free power reproduction of the driving signal with or without carrier and with or without both sidebands, since it is virtually impossible to stray from a straight-line transfer function.
The Digital Linear Amplifier is very power-efficient since linear amplifiers are not needed. The RF linear power amplifier may be designed for any practical power level and any practical carrier frequency. The modulation wave-form is arbitrary, but must be bandlimited to meet the Nyquist criteria for digitally sampled signals.
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