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The Scientific World Journal
Volume 2013 (2013), Article ID 373429, 8 pages
http://dx.doi.org/10.1155/2013/373429
Research Article

Parallel PWMs Based Fully Digital Transmitter with Wide Carrier Frequency Range

School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China

Received 4 July 2013; Accepted 6 August 2013

Academic Editors: A. Garcia-Zambrana and A. Jugessur

Copyright © 2013 Bo Zhou 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 carrier-frequency (CF) and intermediate-frequency (IF) pulse-width modulators (PWMs) based on delay lines are proposed, where baseband signals are conveyed by both positions and pulse widths or densities of the carrier clock. By combining IF-PWM and precorrected CF-PWM, a fully digital transmitter with unit-delay autocalibration is implemented in 180 nm CMOS for high reconfiguration. The proposed architecture achieves wide CF range of 2 M–1 GHz, high power efficiency of 70%, and low error vector magnitude (EVM) of 3%, with spectrum purity of 20 dB optimized in comparison to the existing designs.