Abstract not found

Current System-on-Chip (SoC) designs incorporate an increasing number of mixed-signal components. Design reuse techniques have proved successful for digital design but these rules are difficult to transfer to mixed-signal design.

This work presents a simulation environment for the design of data converters using behavioral modeling and the MATLAB- SIMULINK platform. This environment utilizes a graphic user interface as a CAD tool to design and simulate different data converter architectures. Postprocessing analysis tools are included for static and dynamic performance calculation.

Abstract approved:

: An operational amplifier designed with 0.35um CMOS technology is presented. All the transistors are realized with minimum or near-minimum channel length. As the short channel length causes performance degradation, a proper operational amplifier structure is selected to compensate the performance degradation. The op amp is designed to meet the requirement of high-speed high-resolution sigma delta modulators. It has a folded-cascode first stage and a class-A output stage. It features a DC gain of 78dB, an openloop unity-gain frequency of 266MHZ, a slew rate of 650V/us, and consumes 10.2mW from a +/-1.5V power supply. High level simulation is used to evaluate the OTA performance in sigma delta modulators. 1. INTRODUCTION The fast development of CMOS process technique makes it possible to integrate more and more functions into a single Digital-signal-Processing chip. However, the physical signal (which is analog) still needs an interface to be handled by DSP. A/D and D/A converters are...

converters (ADCs) are one of the key building blocks of state of the art wireless transceivers. In sigma-delta modulator design, the scaling coefficients determine the peak 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 fourth-order multi-bit sigma-delta modulator suitable for Wireless Local Area Networks (WLAN) receivers with feed forward path and the optimum coefficients were 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. A second-order traditional topology has been chosen as the second design example to validate our proposed method. The aim of this paper is the identification of the best coefficients suitable for the proposed topology 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.