Download Design of Modulators for Oversampled Converters by Feng Wang, Ramesh Harjani PDF

By Feng Wang, Ramesh Harjani

Oversampled A/D converters became very hot lately. a few of their merits comprise cozy standards for anti-alias filters, cozy necessities for part matching, excessive solution and compatibility with electronic VLSI know-how. there's a major volume of literature discussing the main, thought and implementation of varied oversampled converters. Such converters are inclined to proceed to proliferate within the foreseeable destiny. also, extra lately there was nice curiosity in low voltage and occasional energy circuit layout. New layout recommendations were proposed for either the electronic area and the analog area. either developments element to the significance of the low-power layout of oversampled A/D converters.
regrettably, there was no systematic examine of the optimum layout of modulators for oversampled converters. layout has ordinarily desirous about new architectures with little cognizance being paid to optimization.
The target of Design of Modulators for Oversampled Converters is to boost a strategy for the optimum layout of modulators in oversampled converters. the first concentration of the presentation is on minimizing energy intake and knowing and restricting the nonlinearities that bring about such converters.
Design of Modulators for Oversampled Converters bargains a quantitative justification for many of the layout tradeoffs and serves as a advisor for designing low-power hugely linear oversampled converters. Designof Modulators for Oversampled Converters will function a precious consultant for circuit layout practitioners, collage researchers and graduate scholars who're drawn to this fast-moving area.

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Extra resources for Design of Modulators for Oversampled Converters

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13) should be used. 16) Discussion and Simulation The results discussed above have been corroborated using SPICE simulations. 3 was used for these simulations. 2. 4. There is excellent agreement between the simulation results and our model throughout the voltage range. 15. The traditional simplified model is only able to approximate the slewing behavior for large phase margin and a small slew rate/bandwidth ratio. Our model on the other hand is general and can predict the slewing behavior for all conditions.

Based on our derivations, the commonly used class AB opamps are not suitable for high resolution/high linearity delta-sigma modulators because the settling process is not really linear. Additionally as we will see in Chapter 5, the use of class AB opamps will result in additional nonlinearities through the power line. However, if the power budget is the primary concern rather than high resolution/high linearity, the use of class AB opamps can save sizable power as shown in Chapter 3.

1) it changes by 5X. Therefore, a small-signal analysis in the s-domain cannot be used and a complete time-domain analysis including nonlinear behavior is necessary. 2. This circuit configuration was chosen for its simplicity, however, the results can be extended to other configurations without much effort. A step input is applied at time t = O. 3. , 1974]. During this period the entire differential pair tail current, Ir, flows through the compensation capacitor, Co. This current is constant during the slewing period.

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