Wireless Local Area Networks (WLANs) experience a growing popularity recently. Where WLANs were primarily used for niche applications in the past, they are now deployed as wireless extensions to computer networks. The...
ISBN:
(数字)9780306476853
ISBN:
(纸本)9781402071164
Wireless Local Area Networks (WLANs) experience a growing popularity recently. Where WLANs were primarily used for niche applications in the past, they are now deployed as wireless extensions to computer networks. The increase of the datarates from 2 Mbps up to 11 Mbps for roughly a constant price has played a major role in this breakthrough. As a consequence, an even greater success can be envisioned for the more recent OFDM-based WLAN standards in the 5 GHz band, which offer up to 54 Mbps. At IMEC we have realised this potential already several years ago and have established a successful research programme on OF- based WLAN. In 1995, we started our research on wireless OFDM in the frame of a - operation project with SAIT, a Belgian telecom company. The goal of the project was to establish a robust network for industrial environments. This resulted in a first OFDM chip, supporting QPSK, for wireless networking at the end of the project (1999). 1999 was also the start of an intense co-operation with National Semiconductor Inc., which resulted in a second generation ASIC in 2000. This OFDM processor supports up to QAM-64 and has a more optimal channel estimation algorithm.
CMOS Circuit Design for RF Sensors is about CMOS circuit design for sensor and actuators to be used in wireless RF systems. The main application is implantable transducers for biomedical purposes such as sensing of ne...
ISBN:
(数字)9780306475283
ISBN:
(纸本)9781402071270
CMOS Circuit Design for RF Sensors is about CMOS circuit design for sensor and actuators to be used in wireless RF systems. The main application is implantable transducers for biomedical purposes such as sensing of nerve signals and electrical stimulation of nerves. Special focus is put on the power and data link in a wireless system with transducers which are powered via the RF link. Novel principles and methods are presented for the regulation of power to the sensors and for the distribution of data and power in an implanted transducer system. One of the main problems in such systems is the transmission of power via an RF link. This problem is analyzed in detail and solutions incorporating an RF magnetic link to the transducers are identified. The theoretical results are supported by experiments from CMOS chips including a system chip for functional electrical stimulation (FES). The work shows that a System on Chip (SoC) solution is feasible using CMOS technology for the RF sensors. The only components which cannot be integrated on the chip are the antenna coil and a capacitor for energy storage. CMOS Circuit Design for RF Sensors will be a useful reference for academics as well as research scientists whom are active in the field of (Analog) Circuit Design and Sensors.
Continuous-Time Sigma-Delta Modulation for A/D Conversion in Radio Receivers describes the design and theory of continuous-time sigma-delta modulators for analog-to-digital conversion in radio receivers. The book'...
ISBN:
(纸本)0792374924;9780792374923;9780306480041
Continuous-Time Sigma-Delta Modulation for A/D Conversion in Radio Receivers describes the design and theory of continuous-time sigma-delta modulators for analog-to-digital conversion in radio receivers. The book's main focus is on dynamic range, linearity and power efficiency aspects of sigma-delta modulators, which are very important requirements for use in battery operated receivers like GSM phones. An important part of the book deals with the image rejection performance of quadrature sigma-delta modulators. It is shown that techniques like dynamic-element-matching and integration of a mixer with the sigma-delta modulator greatly enhance the performance and functionality. In addition, the authors provide the reader with a theoretical overview of continuous-time sigma-delta modulation, including non-ideal effects, stability issues and different filter designs. The book's concluding chapters present chip realizations showing practical implementations of low-power and high-performance sigma-delta modulators for GSM and AM/FM radio applications.
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