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Ralph, Stephen and Farrell, Ronan (2007) Using High Pass Sigma-Delta Modulation for Class-S Power Amplifiers. In: Proceedings of 2007 European Conference on Circuit Theory and Design, 26th - 30th August 2007, Sevilla, Spain.
Ralph, Stephen and Farrell, Ronan (2007) Direct Digital-to-RF Conversion for Mobile-Phone Basestation Applications using Bandpass Sigma Delta Modulation. In: 1st IMEKO TC19 International Symposium on Measurements and Instrumentation for Environmental Monitoring, 19th - 21st September 2007, Iasi, Romania.