A 2.5W 40MHz-Bandwidth Hybrid Supply Modulator with 91% Peak Efficiency,3V Output Swing and 4mV Output Ripple at 3.6V Supply

We describe a supply modulator comprising a proposed delay-based hysteresis controller, proposed wideband class-AB amplifier, and class-D amplifier for an envelope tracking (ET) power amplifier (PA). We investigate the power dissipation and optimization method of the supply modulator for wideband applications taking into consideration the propagation delay, and show that a controller with zero thr...