High-Power Digital Transmitters for Wireless Infrastructure Applications (A Feasibility Study)

Fully digital transmitters (DTXs) have the potential of replacing analog-intensive transmitter (TX) line-ups in future massive multiple-input and multiple-output (mMIMO) systems since they hold the promise of higher system integration level and energy efficiency. DTX operation so far has been limited to low RF output powers. This article...

Energy Efficient and Intrinsically Linear Digital Polar Transmitters

One of the biggest challenges in modern transmitter (TX) design, when going from the fourth generation (4G) to fifth generation (5G) communications network, is to handle the increased linearity requirements without introducing any compromise in the energy efficiency of the TX line-up. In analog systems, high quality for the TX signal can be only...

A Highly Linear Wideband Polar Class-E CMOS Digital Doherty Power Amplifier

This article presents the first application of a digital-intensive intrinsically linear digitally controlled class-E technique in a Doherty configuration. By careful nonlinear segmentation and multiphase RF-clocking along with overdrive-voltage control and automatic duty-cycle correction, it is shown that even the nonlinearities related to...