Band-shaped analog peak-to-average power ratio reduction

This paper demonstrates a band-shaped all-analog peak-to-average power ratio (PAR) reduction. It uses fast and accurate analog components modeled after circuits implemented in IBM 5PAe 0.35-μm SiGe BiCMOS process. The architecture is designed to precisely clip the RF signal at a certain level, but also employs a clipping function shaping technique to reduce in-band and out-of-band interference. By using a combination of low pass filter and high pass filter to shape the clipping signal, this architecture is able to achieve a PAR reduction of 3.51 dB at 10^-4 complementary cumulative distribution function (CCDF) level, while still meeting the adjacent channel leakage ratio (ACLR) and error vector magnitude (EVM) requirements of Long Term Evolution (LTE) cellular base station transmitters.