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Design of Varactor-Based Tunable Matching Networks for Dynamic Load Modulation of High Power Amplifiers

Hossein Mashad Nemati (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik) ; Christian Fager (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik) ; Ulf Gustavsson (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik) ; Rik Jos ; Herbert Zirath (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik)
IEEE Transactions on Microwave Theory and Techniques (0018-9480). Vol. 57 (2009), 5, p. 1110-1118.
[Artikel, refereegranskad vetenskaplig]

In this paper, the design of varactor-based tunable matching networks for dynamic load modulation of high power amplifiers (PAs) is presented. Design guidelines to overcome the common breakdown, and tunability problems of the varactors for high power applications are proposed. Based on the guidelines, using commercially available abrupt junction silicon varactors, a tunable matching network is built and measured. The matching network is then used for load modulation of a 1-GHz 7-W class-E LDMOS PA. Static measurements of the load modulated PA show that the power-added efficiency of the PA is improved by an absolute value of 10% at 10-dB backoff. This promising result proves, for the first time, the feasibility of load modulation techniques for high-power applications in the gigahertz frequency range.

Nyckelord: Load modulation, power amplifier (PA), tunable matching network

Denna post skapades 2009-05-08. Senast ändrad 2017-03-21.
CPL Pubid: 93700


Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik


Elektroteknik och elektronik

Chalmers infrastruktur

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