DocumentCode :
467134
Title :
ΔΣ ADC Design Considerations for WiFi/WiMAX Receivers
Author :
Malla, Pukar ; Lakdawala, Hasnain ; Naiknaware, Ravi ; Krishnamurthy, Soumyanath ; Kornegay, Kevin
Author_Institution :
Intel Corp., Hillsboro
Volume :
1
fYear :
2007
fDate :
13-14 July 2007
Firstpage :
1
Lastpage :
4
Abstract :
Modern multi-standard receivers in deep-submicron technologies pose significant design challenges on the analog baseband. Moving this analog filtering to the digital domain simplifies the design, yielding a process-scalable implementation. However, analog-to-digital converter (ADC) specifications now become more stringent and must be obtained by comprehending the standard and the system. Assuming a receiver NF of 5.96dB and SNR degradation of 0.36dB by the ADC, the proposed dual-mode WiFi/WiMAX receiver attains an input sensitivity of -74dBm (20MHz channel bandwidth). To accommodate the high dynamic range and the anti-alias rejection needed for the system, a Delta-Sigma (ΔΣ) ADC is proposed. Single-loop and Multi-Stage Noise-Shaping (MASH) architectures that achieve a SNR of 69dB at a low oversampling ratio (OSR) of 8 for a conversion bandwidth of 40MHz (108Mbps, OFDM) are investigated. Based on the important insights from this analysis on thermal noise, harmonic distortion, and power tradeoffs, an optimal ΔΣ ADC design is proposed.
Keywords :
WiMax; analogue-digital conversion; radio receivers; wireless LAN; ΔΣ ADC design; WiFi/WiMax receiver; analog filtering; analog-to-digital converter; antialias rejection; channel bandwidth; harmonic distortion; low oversampling ratio; multistage noise-shaping architecture; thermal noise; Analog-digital conversion; Bandwidth; Baseband; Degradation; Digital filters; Dynamic range; Filtering; Noise measurement; Process design; WiMAX;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Signals, Circuits and Systems, 2007. ISSCS 2007. International Symposium on
Conference_Location :
Iasi
Print_ISBN :
1-4244-0968-3
Electronic_ISBN :
1-4244-0969-1
Type :
conf
DOI :
10.1109/ISSCS.2007.4292644
Filename :
4292644
Link To Document :
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