Bridge-tied load
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A bridge-tied load is an output configuration for power amplifiers, used mainly in audio applications. The load (e.g., a speaker) is connected between two amplifier outputs, bridging the two output terminals. This can double the voltage swing at the load (compared with single-ended amplifiers) if the outputs are driven in opposite phases, and therefore the power output can be quadruplicated, since
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Note that driving the load in counterphase makes each amplifier see only half the load impedance.
This output configuration is useful in applications where battery size dictates a lower supply voltage, e.g., automotive or handheld applications.
