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» Hassan Aboushady » Seminars
Ph.D. Thesis Defense
PhD. Candidate: Diomadson Rodrigues Belfort
Title: "High-Order Single-Block LC-Based SD Modulators".
Date: Monday, November 26th, 2012, at 14:00.
Location: Salle 105, Couloir 25-26, 4, Place Jussieu, 75252 Paris.
Committee in Charge:
| - | Catherine Dehollain, | Ecole Polytechnique Federale de Lausanne, EPFL, | Switzerland, | Reviewer. |
| - | Jose-Manuel de la Rosa, | Sevilla University, | Spain, | Reviewer. |
| - | Yuri Catunda, | Federal University of Rio Grande do Norte, | Brazil. |
| - | Jan Westra, | Broadcom, | The Netherlands. |
| - | Christoph Hagleitner, | IBM-Zurich Research Laboratories, | Switzerland. |
| - | Geoffroy Klisnick, | University of Pierre & Marie Curie, | France. |
| - | Habib Mehrez, | University of Pierre & Marie Curie, | France. |
| - | Hassan Aboushady, | University of Pierre & Marie Curie, | France. |
Thesis Summary:
Software-Defined Radio (SDR) was envisioned in the late 1990¿s. Since then, a lot of effort has
been done to implement such a radio transceiver, where most of the analog functions such as
down-conversion and channel-selection are moved to the digital domain. With these features a
SDR could be easily programmed and adapted to new standards. However, its implementation
using a Nyquist-rate Analog-to-Digital Converter (ADC) has been challenging and very power
hungry, making it inappropriate for mobile applications.
Bandpass Sigma-Delta Modulator (SDM) using LC resonators are well suited for that purpose, as they can
convert a narrow band around an Radio Frequency (RF) center frequency.
High-order LC-based SDMin the literature use the nodes between the LC tanks either
for feedforward or feedback coefficients in order to obtain the desired Noise Transfer Function
(NTF). These nodes are usually a source of additional noise, non-linearity and power
consumption to the overall performance of the SDM.
In this work, a methodology to design high-order LC-Based single-block SDM is
introduced. This opens the door to unexplored filter topologies such as high-order passively
coupled LC filters and Microelectromechanical Systems (MEMS) filters.
The main contributions of his work can be summarized in the following points:
- Design Methodology for LC-Based Single-Block Sigma-Delta Modulators
- Undersampled 4th order Capacitively-Coupled Sigma-Delta
- Systematic design procedures for the RF building blocks
- Design and Implementation of the first 4th Order Capacitively-Coupled LC-Based Sigma-Delta Modulator
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