Conventional cascaded H?bridge power amplifier (CHB?PA) with N identical H?bridge power modules (HBPMs) could create 2N+1 levels of output voltage at most, and the output voltage level will directly affect the sinusoidal characteristic and fidelity performance of power amplifiers. With the same number of cascaded HBPMs, this paper firstly proposes an asymmetrical cascaded multilevel power amplifier (ACM?PA). Secondly, a virtual carrier phase shift pulse width modulation (VCPS?PWM) strategy is proposed for ACM?PA, which with the same HBPM number as conventional CHB?PA, to increase the output voltage level up to 6N-3. Comparative simulation and experimental results are included to validate that the proposed ACM?PA and VCPS?PWM could obviously increase the output voltage level and decrease the total harmonic distortion (THD) of load current, thus to improve the fidelity performance of power amplifiers.