Mythili, P; Babita, Jose R; Jimson, Mathew; Pradhan, D K(IEEE, December 10, 2007)
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Abstract:
This work presents a wideband low-distortion sigmadelta
analog-to-digital converter (ADC) for Wireless Local Area
Network (WLAN) standard. The proposed converter makes use
of low-distortion swing suppression SDM architecture which is
highly suitable for low oversampling ratios to attain high
linearity over a wide bandwidth. The modulator employs a 2-2
cascaded sigma-delta modulator with feedforward path with a
single-bit quantizer in the first stage and 4-bit in the second stage.
The modulator is designed in TSMC 0.18um CMOS technology
and operates at 1.8V supply voltage. Simulation results show
that, a peak SNDR of 57dB and a spurious free dynamic range
(SFDR) of 66dB is obtained for a 10MHz signal bandwidth, and
an oversampling ratio of 8.
Description:
Information, Communications & Signal Processing, 2007 6th International Conference on