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Journal of Electrical and Computer Engineering
Volume 2011, Article ID 507381, 12 pages
http://dx.doi.org/10.1155/2011/507381
Review Article

Open-Loop Wide-Bandwidth Phase Modulation Techniques

1Electrical Engineering Department, University of California, Los Angeles, CA 90095-1594, USA
2Broadcom Corporation, Irvine, CA 92617-3038, USA

Received 31 May 2011; Accepted 16 August 2011

Academic Editor: Kenichi Okada

Copyright © 2011 Nitin Nidhi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The ever-increasing growth in the bandwidth of wireless communication channels requires the transmitter to be wide-bandwidth and power-efficient. Polar and outphasing transmitter topologies are two promising candidates for such applications, in future. Both these architectures require a wide-bandwidth phase modulator. Open-loop phase modulation presents a viable solution for achieving wide-bandwidth operation. An overview of prior art and recent approaches for phase modulation is presented in this paper. Phase quantization noise cancellation was recently introduced to lower the out-of-band noise in a digital phase modulator. A detailed analysis on the impact of timing and quantization of the cancellation signal is presented. Noise generated by the transmitter in the receive band frequency poses another challenge for wide-bandwidth transmitter design. Addition of a noise transfer function notch, in a digital phase modulator, to reduce the noise in the receive band during phase modulation is described in this paper.