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Conventional radio frequency (RF) transmitters frequently necessitate a pair of high-resolution, high-speed digital-to-analog converters (DACs) to ensure a specific level of linearity in wireless communication systems. Nevertheless, the high-resolution DACs escalate power consumption and area requirements and intensify the need for heat dissipation mechanisms. This paper presents a direct digital synthesis (DDS) transmitter using a pair of RF DACs with just 2 bits of resolution. The DDS transmitter, which uses a proposed digital pulse-width modulation signal with dithering, is resistant to power amplifier (PA) nonlinearity. Tested with 5G uplink signals and a pair of nonlinear PAs at 836.5 MHz, the transmitter could pass the stringent spectral requirements for 5G applications without using any digital predistortion or calibration techniques.
Chang et al. (Mon,) studied this question.