The design of high‐performance Doherty power amplifier

Abstract

In this article, a frequency-regeneration type divide-by-3 FD with quadrature signal outputs is presented. This chip is implemented using TSMC 0.18-lm CMOS technology. Outputs of ILFD are mixed with the input signal to regenerate the required division ratio. The current reuse technique is adopted to save the power consumption. Measured results show that the free-running frequency is from 1.173 to 1.25 GHz. The proposed FD can cover the input frequency from 3.51 to 3.8 GHz at the incident power of À3 dBm. This core circuit draws a 12 mA current from a 1.8 V power supply. ACKNOWLEDGMENTS