I. Introduction
With the development of wireless Internet technology, wireless communication technologies such as infrared, Bluetooth and WIFI have been applied to our daily life. With the gradual maturity of technology, low power Bluetooth Low Energy (BLE) standard is becoming one of the most suitable communication standard. BLE will be further improved in terms of extensive application, security, transmission accuracy and high efficiency. BLE digital power amplifier has the advantages of convenient usage, high efficiency and high speed, which has gradually attracted people's attention.