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Article: A 1.9 GHz adaptive feedforward power amplifier.
- Article from:
- Microwave Journal
- Article date:
- November 1, 1998
- Author:
CopyrightCOPYRIGHT 1998 Horizon House Publications, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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A relatively low power feedforward amplifier for 1.9 GHz has been developed to demonstrate the feasibility of the adaptive feedforward linearization technique. The saturated two-tone output power of this amplifier is approximately 4 W. The measured third-order intermodulation is -18 dBc before the linearization loop is closed; after the loop is closed, this value is suppressed to -45 dBc. Therefore, the amplifier's intermodulation cancellation performance is greater than 25 dB.
Linear power amplifiers frequently are used to amplify multicarrier analog signals or nonconstant envelope digital modulation signals. For these signals with high peak-to-average ratios, ...