  This paper presents the first-ever highly linear and load-insensitive
three-way load-modulation power amplifier (PA) based on reconfigurable hybrid
asymmetrical load modulated balanced amplifier (H-ALMBA). Through proper
amplitude and phase controls, the carrier, control amplifier (CA), and two
peaking balanced amplifiers (BA1 and BA2) can form a linear high-order load
modulation over wide bandwidth. Moreover, it is theoretically unveiled that the
load modulation behavior of H-ALMBA can be insensitive to load mismatch by
leveraging bias reconfiguration and the intrinsic load-insensitivity of
balanced topology. Specifically, the PA's linearity and efficiency profiles can
be maintained against arbitrary load mismatch through $Z_\mathrm{L}$-dependent
reconfiguration of CA supply voltage ($V_\mathrm{DD,CA}$) and turning-on
sequence of BA1 and BA2. Based on the proposed theory, an RF-input linear
H-ALMBA is developed with GaN transistors and wideband quadrature hybrids. Over
the design bandwidth from $1.7$-$2.9$ GHz, an efficiency of $56.8\%$$-$$72.9\%$
at peak power and $49.8\%$$-$$61.2\%$ at $10$-dB PBO are measured together with
linear AMAM and AMPM responses. In modulated evaluation with 4G LTE signal, an
EVM of $3.1\%$, ACPR of $-39$ dB, and average efficiency of up to $52\%$ are
measured. Moreover, the reconfigurable H-ALMBA experimentally maintains an
excellent average efficiency and linearity against arbitrary load mismatch at
$2:1$ VSWR, and this mismatch-resilient operation can be achieved at any
in-band frequencies. The overall measured performance favorably outperforms the
state-of-the-art.
