@inproceedings{3cf0cc74ff164a09a464e071a9a11d7d,
title = "A polar transmitter using a linear-assisted delta-modulation envelope-amplifier for WCDMA applications",
abstract = "A polar transmitter using a new linear-assisted delta-modulation (LADM) envelope-amplifier has been developed for WCDMA applications. The LADM system is composed of a highly efficient switching block based on a 200-MHz-clock delta-modulator, which is implemented in a 0.18-μm CMOS IC, and a highly accurate linear block. In the LADM approach, the residual quantization noise and distortion of switching amplification are removed through the assistant linear process; thus, a sufficiently low ACPR of -45 dBc and a small EVM of 1.7% can be achieved without a pre-distortion technique. The developed polar transmitter nearly doubles the average efficiency in the 10- to 15-dB back-off region of class-AB PAs.",
keywords = "CMOS, Code division multiple access (CDMA), Delta modulation, Polar transmitter, Power amplifiers",
author = "Kazuaki Kunihiro and Kiyohiko Takahashi and Shingo Yamanouchi and Tomohisa Hirayama and Hikaru Hida and Tanaka, {Shin Ichi}",
year = "2006",
month = jan,
day = "1",
doi = "10.1109/EUMC.2006.281219",
language = "English",
isbn = "2960055160",
series = "Proceedings of the 36th European Microwave Conference, EuMC 2006",
publisher = "IEEE Computer Society",
pages = "137--140",
booktitle = "Proceedings of the 36th European Microwave Conference, EuMC 2006",
note = "36th European Microwave Conference, EuMC 2006 ; Conference date: 10-09-2006 Through 12-09-2006",
}