Mythili, P; Jawar, Singh; Babita, Jose R; Jimson, Mathew(IEEE, December 17, 2007)
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Abstract:
This work presents a triple-mode sigma-delta modulator
for three wireless standards namely GSM/WCDMA and
Bluetooth. A reconfigurable ADC has been used to meet
the wide bandwidth and high dynamic range requirements
of the multi-standard receivers with less power
consumption. A highly linear sigma-delta ADC which has
reduced sensitivity to circuit imperfections has been
chosen in our design. This is particularly suitable for wide
band applications where the oversampling ratio is low.
Simulation results indicate that the modulator achieves a
peak SNDR of 84/68/68 dB over a bandwidth of
0.2/3.84/1.5 MHz with an oversampling ratio 128/8/8 in
GSM/WCDMA/Bluetooth modes respectively
Description:
10th International Conference on Information Technology
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