Mitigation of Load Mismatch Effects Using an Orthogonal Load Modulated Balanced Amplifier

Abstract

Cit a tio n fo r fin al p u blis h e d ve r sio n: Q u a gli a, Ro b e r t o, Po w ell, Jeffr ey R., C h a u d h ry, Ka u s e r a n d C ri p p s, S t ev e C. 2 0 2 2. Mi ti g a tio n of lo a d m i s m a t c h effe c t s u si n g a n o r t h o g o n al lo a d m o d ul a t e d b al a n c e d a m plifier. IE E E T r a n s a c tio n s o n Mi c r o w av e Th e o ry a n d Tec h ni q u e s 1 0.

Output Signal Re-Injection in Load-Modulated Balanced Amplifiers for RF Bandwidth Improvement

“…The active devices are the Wolfspeed CG2H40025F GaN HEMTs biased at 28 V, -2.7 V, 50 mA, while the quadrature couplers are the Anaren11306-3s, nominally designed for 2-4 GHz operation. The balanced PA underpinning the RLMBA has been only slightly changed from [11]. Being based on a reasonably simple output topology, with only two-sections of microstrip impedance transformation, it leaves enough room for exploring the potential of load modulation while still providing a fair matching over the frequency band (see Fig.…”

Load-Modulated Balanced Amplifier: From First Invention to Recent Development

“…The first paper showing the OLMBA [34] demonstrated the broadband tuning ability of the concept, also showing that the bandwidth of the OLMBA can exceed significantly that of the coupler in the low frequency end, meaning that a compact coupler can be used for low frequency operation. Even more important, the OLMBA has been used to improve the PA performance in presence of load mismatch, resulting better than that of an analogous balanced amplifier [35]. Together with the double-balanced LMBA structure shown in [36], it shows that the potential of the LMBA variants to tackle an important issue as that of design in presence of antenna mismatch is huge and still little explored, especially in the field of linear amplification.…”

Development and validation of a novel bias network design method for a classAB PA

“…Power amplifier (PA), as the core module of modern wireless communication system, with its performance, for example, the output power () and power added efficiency (), can greatly affect the overall performance of the entire communication systems 1–3 . Thus, in order to improve the quality of the communication system, a series of high‐performance PAs with different types of classes and topologies have been proposed over the years, such as class F, 4–7 class J, 8–10 Doherty PA, 11–15 outphasing PA, 16–18 and load modulated balanced amplifier (LMBA), 19–21 and good performance have been obtained.…”