@article{10902/20133,
year = {2020},
month = {11},
url = {http://hdl.handle.net/10902/20133},
abstract = {Implantable biomedical devices intended for remote follow-up of Cardiovascular Diseases (CVD) are often based on MEMS pressure sensors and the corresponding CMOS electronics, which are responsible for powering, signal conditioning and data transmission. This kind of heterogeneous systems achieves reduced dimensions and consumption by monolithic integration on the same silicon substrate. The objective of this work is to analyze and fully characterize several Capacitor-Controlled Oscillator (CCO) topologies that can be used for the aforementioned implantable applications, by comparison of their most relevant performance parameters. The results will allow the design optimization of low-power wireless implants, aimed at a future development of embedded systems with real-time data acquisition. Five topologies have been chosen for the evaluation: a standard ring oscillator; a current-starved ring oscillator; a Lee-Kim fully-differential oscillator; a coupled Sawtooth oscillator, and a modified Sawtooth oscillator designed for CCOs biased by a ramped voltage signal. Comprehensive simulations allowed the estimation of the output frequency, percentage tuning range, maximum linearity error, phase noise and power consumption for each design, as well as a Figure of Merit, for every CCO. For the calculation of these performance metrics, the impact of biasing circuits and different tuning strategies has also been considered.},
organization = {This work was carried out in collaboration with the Hospital Marqués de Valdecilla and its medical research institute IDIVAL, in the context of the “Self-Expanding Dual-Anchor Umbrella with Wireless Monitoring Feature of Intra-Atrial Pressure” project (DTS19/00094). Financial support is provided by the Ministerio de Ciencia, Innovación y  Universidades (Spanish Goverment), by means of its annual call for Technological Development Projects in Health (DTS2019) under the framework of the Health Research and Development Strategy (AES) that, in turn, belongs to the State Plan for Scientific and Technical Research and Innovation 2017-2020, whose objectives are aligned with the ones highlighted by the European Union under Horizon 2020.},
publisher = {Elsevier},
publisher = {Microprocessors and Microsystems, 2020, 79, 103273},
title = {Performance evaluation of CCOs for the optimization of low-power pressure-based implantable wireless systems},
author = {Miguel Díaz, José Ángel and Lechuga Solaegui, Yolanda and Allende Recio, Miguel Ángel and Martínez Solórzano, María del Mar},
}