In various implementations of a load modulated balanced amplifier (LMBA), a control signal is generated (e.g., automatically generated) based at least in part on an input signal. The LBMA generally comprises a balanced amplifier, an input splitter, and a control path. A common theme of the different variants described below is that we use a nonlinear characteristic to generate a power-dependent asymmetry in the relative output power levels of the balanced and control amplifiers. This power-depended asymmetry results in dynamic load modulation of the balanced amplifiers, which in turn provides improved efficiency. In one implementation, for example, an LMBA comprises a pair of primary amplifiers collectively providing a balanced amplifier and a control amplifier coupled to the balanced amplifier and adapted to provide a control signal to the balanced amplifier. The control amplifier is adapted to automatically generate the control signal based at least in part upon the input signal to provide load modulation of the balanced amplifier.
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