Abstract
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 0.35μm CMOS process and can operate at 5MHz with the output voltage range from 0.6V to 3.4V. The experimental results show that the voltage-tracking speed can achieve 8.8μs/V for up-tracking and 6μs/V for down-tracking. Besides, the recovery time is less than 8μs when the load change step is 400mA.
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