A wide output range voltage-mode buck converter with fast voltage-Tracking speed for RF power amplifiers

作者：Xu, Shen; Sun, Fengfeng; Yang, Miao; Han, Caixia; Sun, Weifeng^*; Lu, Shengli

来源：MICROELECTRONICS JOURNAL, 2015, 46(1): 111-120.

DOI：10.1016/j.mejo.2014.11.002

• Error amplifier
• Maximum charging current control method
• Pulse skip mode
• Voltage-tracking speed

A high switching frequency voltage-mode buck converter with fast voltage-tracking speed, wide output range and PWM/PSM control strategy for radio frequency (RF) power amplifiers (PAs) has been proposed. To achieve the fast voltage-tracking speed, the maximum charging and discharging current control method has been used, and the filter inductor and capacitor values are reduced. A novel compensated error amplifier (EA) is presented to realize the wide output range. The investigated converter has been fabricated with GF 0.35 mu m CMOS process and can operate at 5 MHz with the output voltage range from 0.6 V to 3.4 V. The experimental results show that the voltage-tracking speed can achieve 8.8 mu s/V for up-tracking and 6 mu s/V for down-tracking. Besides, the recovery time is less than 8 mu s when the load change step is 400 mA.

• 出版日期2015-1
• 单位东南大学