Anaren Doherty Combiners Simplify Amplifier Development

Anaren Doherty Combiners Simplify Amplifier Development

May 12, 2021

Cellular Infrastructure

Anaren Doherty combiners are designed for symmetrical two‐way Doherty power amplifier architectures that have even power slitting ratio between main and peak power amplifiers. A typical Doherty combining circuit consisting of two quarter‐wave‐length transmission lines of 50 Ohm and 35 Ohm are packaged in the combiner as shown in Figure 1.

A transmission line of fixed physical length is of quarter‐wave length only at a single frequency, this type of Doherty combiners are considered narrow band. Typically +/‐ 5% of bandwidth are achieved in this type of Doherty amplifiers. With several models, the Anaren Doherty combiner product line covers major communication bands ranging from 700 MHz to 2700 MHz. Each model is optimized for the center frequency of targeted frequency band. However, as new spectrum is being released worldwide to meet urgent capacity demands, the pre‐designed standard models can be tuned in customer applications to meet performance in these nearby frequency bands.

This document provides guidelines to tune these standard models for off‐band applications.

Related Content

RF & Microwave Support

Allow us an opportunity to assess your project and help bring your vision to market faster.

About our Team of Experts

Richardson RFPD has a team of over 50 technical resources available to provide design assistance on a variety of topics.  Although there are too many to name, we have highlighted specific topics that provide a representation of our support.