The MTT-S Technical Coordinating and Future Directions Committee: Promoting Our Technical Communities-2022

Active Load-Modulated Devices: A General PA Network Solution Identifying Highly Efficient Linearizer Systems

“…Finally, the active input impedance ⃗ z A can be solved using (10), giving us the familiar LMBA input impedance equations for the active ports…”

“…The equations reveal that the LMBA behaviour is susceptible to output load mismatch, such as antenna loading, highlighting the challenging MIMO environments [10]. The load mismatch causes the input impedances at ports 2 and 4 to no longer be identical and also introduces active loadmodulation at port 3, with the control current I c in the denominator, which may affect the power conservation properties.…”

“…We apply our approach to extend the existing analysis to also account for output load mismatch, such as due to antenna mutual coupling in arrays. Such practical considerations are very useful for current and future developments of multi-transistor PAs in MIMO environments [10]. Finally, we present a conceptual overview of the similarities and constraints between systems which use a quadrature hybrid coupler to highlight a top-level approach of identifying and classifying new device topologies.…”

Correction

“…I n the article "TC-24 Microwave/mm-Wave Radar, Sensing, and Array Systems Committee-2022," which appears in [1] and is published in the November 2022 issue of IEEE Microwave Magazine, one of the contributing authors, Babak Jamali, was not included in the list of authors. IEEE Microwave Magazine regrets this omission.…”