A system for inducing tissue vibration for magnetic resonance elastography is described. Via output terminals, the amplifiers output second audio signals to externally connected power amplifiers. The method includes generating an accumulation result according to a number of the first pulses and a number of the second pulses for estimating the baseline wander of the transmission signal, and compensating the baseline wander of the transmission line according to the accumulation result. In this embodiment, the circuitry is configured to reduce a drain-source voltage of the first transistor based on the input signal.