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《Journal of Fudan University(Natural Science)》 2012-06
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Design of Data Converters for Dual-carrier Orthogonal Frequency-Division Multiplexing Ultra-wideband System

XIA Jie-feng,HA Qian-qian,LIN Yu-jing,YE Fan,REN Jun-yan(State Key Laboratory of ASIC and systems,Fudan University,Shanghai 201203,China)  
Dual-carrier orthogonal frequency-division multiplexing(DC-OFDM) is adopted in China as the ultra-wideband(UWB) national standard.Two data converters are designed based on this UWB system standard,including a four-channel 650 MS/s 8 bit current-steering digital-to-analog converter(DAC) and a four-channel 300 MS/s 6 bit folding-and-interpolating analog-to-digital converter(ADC).Both of them are integrated on a printed circuit board(PCB).The DAC has focused on the matching of current sources and its dynamic performance is improved by reducing the voltage swing of the switch transistors.Testing result shows that one sub-DAC can achieve over 52 dB spurious-free dynamic range(SFDR) locating at 68 MHz input.The ADC adopts inter-stage pipelined switches to relax amplifiers' bandwidth,utilizes active interpolators to further mitigate the offset of the comparators and keeps the signal-to-noise-and-distortion ration(SNDR) of sub-ADC over 32 dB in the entire Nyquist band.
【Fund】: 国家科技重大专项计划资助项目(2011ZX03004-001-02 2009ZX03006-007-01)
【CateGory Index】: TN792
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