A Digitally Assisted Dual-Input Dual-Band Doherty Power Amplifier With Enhanced Efficiency and Linearity

Authors:
Publisher website
Google Scholar
Abstract
This brief presents a dual-input dual-band Doherty power amplifier that operates at 850 MHz and 2100 MHz. The presented Doherty power amplifier utilizes a compact input matching network and composite right-left handed phase offset line. This Doherty power amplifier delivers a peak output power of around 44.5 dBm with an efficiency enhancement region upto 9-10 dB output power back off at both the operating frequencies. Further, the phase offset angles between main and auxiliary power amplifiers are controlled digitally at both the operating frequencies in order to improve the performance. These optimum phase offset angles provide enhanced efficiency and linearity throughout the back-off region at both the operating frequencies. As compared to the conventional phase offset of 90⁰, the optimum offset angle of 120⁰ at 850 MHz provides an improvement of 13% in drain efficiency and 8.5 dB in C/IMD3. Similarly, an improvement of 4 dB in C/IMD3 is achieved by digitally setting a phase offset of 80⁰ at 2100 MHz.
Funding Information
  • Department of Science and Technology, Government of India through DST INSPIRE Fellowship and DST (SB/S3/EECE/047/2014)

This publication has 13 references indexed in Scilit: