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2008
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Multi-mode sub-Nyquist rate digital-to-analog conversion for direct waveform synthesis

8 years 8 months ago
Multi-mode sub-Nyquist rate digital-to-analog conversion for direct waveform synthesis
This paper describes the sub-Nyquist rate digital-to-analog conversion technique for a direct waveform synthesis (DWS) transmitter. IEEE 802.22 TV band Cognitive Radio (CR) transmitter requires seamless frequency hoping and wide frequency coverage of 54MHz-806MHz. The proposed transmitter directly converts the digital baseband samples to RF frequencies in the target channels obviating the up-conversion mixer. The mostly-digital architecture of this transmitter features agile functionality support for Software Defined Radio (SDR) operation. A 10-bit 600MS/s multi-mode DAC shapes the analog output spectrum envelope to enhance image spectrum located in the target channels and suppress other unwanted harmonics. Compared to Nyquist rate direct synthesis, this sub-Nyquist rate DWS architecture reduces both system complexity and power consumption by half.
Stanley Yuan-Shih Chen, Nam-Seog Kim, Jan M. Rabae
Added 01 Jun 2010
Updated 01 Jun 2010
Type Conference
Year 2008
Where SIPS
Authors Stanley Yuan-Shih Chen, Nam-Seog Kim, Jan M. Rabaey
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