Mixer-Less Direct Digital to RF Transmitters
Available transmitters for SDRs have not yet reached the wholly digital solution as they are still based on heterodyne or homodyne mixing architecture following the digital-to-analog conversion. A feasible solution to realizing a digital transmitter with minimal analog/RF hardware is to completely remove the up-conversion stage which is also the predominant source of nonlinearity in a conventional radio. The proposed technique eliminates the need for heterodyne mixing following the digital-to-analog conversion, a technology deemed critical to meet the SDR forum's definition of the "ideal software radio". Additionally, this architecture can serve as a common architecture that can support multiple radio standards and technologies. Our synopsis of transmitter evolution was published in the IEEE Microwave Magazine.
Students Involved: S. Balasubramanian,V. J. Patel, L. Duncan