Single-supply Multi-level Envelope Tracker

The present invention refers to a multi-level tracker aiming at enhancing energy efficiency of radio frequency and microwave amplifiers, for radar and telecommunications applications.

Title of the patent Single-supply Multi-level Envelope Tracker for RF Power Amplifier Efficiency Enhancement
Thematic area Electrical, electronic and information engineering
Ownership Alma Mater Studiorum - University of Bologna and University of Colorado
Inventors Tommaso Cappello, Corrado Florian, Zoya Popovic
Protection International
Licensing status Available for licensing agreements
Keywords Single supply multilevel converter, RF amplifier, Envelope Tracking, Supply modulation, RF amplifier efficiency
Filed on May 07, 2018

The Multilevel Envelop Tracker is proposed for increasing the energy efficiency of radio frequency and microwave amplifiers. It operates through a single source of supply voltage by exploiting capacitors that implement different voltage levels: these capacitors are kept charged at the desired levels through a feedback network and a suitable control strategy that recharges the capacitors through the switches of the multilevel converter. The innovation lies in the use of a multi-level converter with a single supply voltage source for this type of application and in the capacitor’s charging control algorithm.


High energy efficiency radio frequency and microwave transmitters for telecommunications and radar applications.


Reduction of complexity and cost of highly efficient RF and microwave transmitters.


T. Cappello, S. Verploegh, C. Florian and Z. Popovic, "Single-DC-Input Multi-Level Envelope Tracking of a High-Efficiency X-band Power Amplifier," 2019 IEEE MTT-S International Microwave Symposium (IMS), Boston, MA, USA, 2019, pp. 464-467. doi: 10.1109/MWSYM.2019.8701096