Mythili, P; Babita, Jose R; Mathew, J; Ramesan, R(IEEE, October 12, 2008)
[+]
[-]
Abstract:
Over-sampling sigma-delta analogue-to-digital
converters (ADCs) are one of the key building blocks of state of the
art wireless transceivers. In the sigma-delta modulator design the
scaling coefficients determine the overall signal-to-noise ratio.
Therefore, selecting the optimum value of the coefficient is very
important. To this end, this paper addresses the design of a fourthorder
multi-bit sigma-delta modulator for Wireless Local Area
Networks (WLAN) receiver with feed-forward path and the
optimum coefficients are selected using genetic algorithm (GA)-
based search method. In particular, 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 focus of this paper is the identification
of the best coefficients suitable for the proposed topology as well as
the optimization of a set of system parameters in order to achieve
the desired signal-to-noise ratio. GA-based search engine is a
stochastic search method which can find the optimum solution
within the given constraints.
Description:
Systems, Man and Cybernetics, 2008. SMC 2008. IEEE International Conference on