A 2.4-GHz latch-structured power amplifier for Bluetooth

A two-stage class E power amplifier operating at 2.4GHz was designed in a 0.25-/spl mu/m CMOS process for class-1 Bluetooth applications. The power amplifier employs a class-E topology in order to obtain high efficiency by exploiting its soft-switching property. The latch-structured design of the preamplifier with auxiliary amplifiers enables its output signal to be as sharp as possible for the soft switching of the next stage power amplifier. This improves the overall efficiency of the proposed power amplifier which has a PAE of 65.8%,a power gain of 20dB and an output power of 20dBm.