MSU Technologies

LINEARIZATION TECHNIQUES FOR WIRELESS DIGITAL TRANSMITTERS

VAlue proposition

There is demand for compact, power-efficient, and low-cost wireless communication solutions, particularly in mobile and wearable systems and fifth-generation (5G) cellular communications. High-density integration, low power consumption, and improved linearity are crucial for meeting the requirements of high data rates, wide bandwidth, and high spectral efficiency. The use of digital transmitters or digital power amplifiers (DPA) with an array of small unit PA cells controlled by a digital code word offers significant advantages over conventional analog transmitter architectures, including reduced power consumption, smaller form factor, and enhanced performance at various output power levels. This technology for achieving enhanced linearity in digital transmitters ensures high-quality wireless communication performance while maintaining power efficiency and compact design.

Description of Technology

This technology introduces an innovative digital transmitter architecture that leverages a digital signal processor and a switched capacitor circuit to achieve enhanced linearity and power efficiency. The switched capacitor circuit comprises a plurality of unit cells arranged in parallel, each consisting of a capacitor coupled to either a drive voltage or a reference voltage via a switch implemented by two transistors. By temporally shifting the control signals applied to the transistors, the switching resistance is minimized, resulting in improved linearity. The circuit is partitioned into two subsets of unit cells, with one subset being switched between the drive voltage and reference voltage based on a control signal, while the other subset remains unswitched. This design enables the digital transmitter to deliver high-quality wireless communication performance while maintaining a compact form factor and low power consumption, making it suitable for various applications such as mobile and wearable systems, as well as fifth-generation (5G) cellular communications.

Benefits