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Building Blocks for an Ultra Low-Power MEMS-based Radio

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Reactive Power Imbalances in LC VCOs and their Influence on Phase Noise Mechanisms

Adil Koukab

Phase-noise mechanisms in cross-coupled LC voltage-controlled oscillators (VCOs) are reviewed based on a physical understanding of reactive power imbalances in the tank and in the active part. These phenomena are proven to be the predominant phase-noise de ...

2011

A MEMS-based 2.4-GHz sub-sampling RF front-end for advanced healthcare applications

Christian Enz, Aravind Prasad Heragu Singaiyengar

This work presents a Bulk Acoustic Wave (BAW) resonator based 2.4-GHz front-end compliant to the Bluetooth LE standard and targeting advanced biomedical applications. A new transceiver architecture is proposed that combines BAW resonators and a sub-samplin ...

2011

LC-VCO Design With Dual-Gm, Boosted for RF Oscillation and Attenuated for LF Noise

Adil Koukab

A VCO topology with a high gm at RF and low gm at low frequencies (LF) is presented. A high gm(RF) improves start-up conditions, and a low gm(LF) enables a significant improvement of the phase noise and the power supply rejection. The VCO with a modified p ...

2010

Active Microelectromechanical Resonator

Daniel Grogg

The progress in the technology of microelectronic devices has led to a strong miniaturization and high performance for circuits and systems, enabling modern applications such as mobile computing and communications. Today, remaining "off-chip" components th ...

EPFL2010

Low power frequency synthesizer for mobile communications systems

Imre Kovacs

A novel frequency synthesizer with a strong emphasis on low-power consumption (2mW) was developed for this thesis. A BAW-resonator was used for the design of the high-frequency oscillator. The BAW's high Q-Factor ensured a minimal power consumption, while ...

EPFL2009

Nanogap MEM resonators on SOI

Nicoleta-Diana Ciressan

Today's consumer electronics based on a large variety of time-keeping and frequency reference applications is based on quartz-crystal oscillators, because of their excellent performances in terms of quality factor, thermal and frequency stability. However, ...

EPFL2009

A Narrowband Multi-Channel 2.4 GHz MEMS-Based Transceiver

Christian Enz

This paper presents a new radio architecture targeting RF transceivers for WSN, WBAN, and biomedical applications. The high miniaturization required by such applications is achieved thanks to the combination of high-Q MEMS devices, such as RF BAW re ...

2009

Self-sustained Low Power Oscillator Based on Vibrating Body Field Effect Transistor

Mihai Adrian Ionescu, Daniel Grogg

The operation of a vibrating body field effect transistor (VB-FET) near pull-in is exploited to experimentally demonstrate a self-oscillating device. The positive feedback mechanism is triggered at the onset of inversion in a depleted VB-FET channel, near ...

IEEE Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2009

NoC Topology Synthesis for Supporting Shutdown of Voltage Islands in SoCs

Giovanni De Micheli, Luca Benini, Srinivasan Murali, Ciprian Seiculescu

In many Systems on Chips (SoCs), the cores are clustered in to voltage islands. When cores in an island are unused, the entire island can be shutdown to reduce the leakage power consumption. However, today, the interconnect architecture is a bottleneck in ...

2009

A low-power 2.4 GHz CMOS receiver using BAW resonators

Jérémie Chabloz

It has already been a few years since the first appearance of micro-electromechanical systems (MEMS) in academic research. Since then, a broad number of devices have been designed under this generic term. Bulk-acoustic wave (BAW) resonators are among the f ...

EPFL2008