Focusing on the application requirements on high-efficiency radio frequency power amplifier in wireless communication system，the studies and applications of radio frequency Switch-Mode Power Amplifier(SMPA) technology are surveyed. The application characteristics of SMPA under different structures are also compared. By using the multi-bit Band-Pass Delta-Sigma Modulator(BPDSM) and multi-level SMPA, a novel full-digital transmitter structure based on Voltage-Mode Class-D(VMCD) power amplifier is proposed. And the full-digital transmitter is implemented based on the Field Programmable Gate Array(FPGA) and lump components. The hardware measurement results show that the transmitter achieves a power efficiency greater than 60% around an average output power of 15.2 W in 30-88 MHz frequency.