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IEICE Transactions on Communications 2008 E91-B(4):1215-1218; doi:10.1093/ietcom/e91-b.4.1215
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Regular Section -- Letters -- Wireless Communication Technologies

Evaluation of Digital-to-RF Upconversion Transmitter Using Harmonic Images of DAC Output

Minseok KIM1, Tatsuo FUJI2, Takafumi NAKABAYASHI2 and Hiroyuki ARAI2

1 The author is with the Department of International Development Engineering, Tokyo Institute of Technology, Tokyo, 152-8552 Japan. E-mail: mskim{at}ide.titech.ac.jp, 2 The authors are with the Department of Electrical & Computer Engineering, Yokohama National University, Yokohama-shi, 240-8501 Japan.


  Abstract

This letter evaluates a transmitter architecture using harmonic images in D/A conversion for generating RF signals. In generating harmonic images, the problems such as intermodulation distortion of DAC were investigated. We developed an evaluation system with two bandpass filter and a buffer amplifier. It was experimentally found that the RF signal up to around 400 MHz can be generated by a commonly used 14-bit DAC at the sampling rates of around 40 MHz with EVM less than 6.6%. This letter also presents a more feasible transmitter example having an IF stage with harmonic image extraction scheme and a typical RF upconversion stage.

Key Words: DAC, harmonic, SDR, sinc distortion, up-conversion, EVM

Manuscript received August 28, 2007. Manuscript revised November 30, 2007.


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