Research Line A
Main Research Areas
The research group is composed of 6 senior researchers, 13 PhD students, and more than 20 MSc students.

The long term objective / mission of the group is

  • Design of low-power System on a chip (SoC) solutions in advanced CMOS technologies oriented for the wireless communications, consumer-electronics and medical applications.

The main research areas are:

  1. Video and base-band communications circuits:
    • Nyquist-rate ADCs;
    • High efficiency sigma delta modulators
    • Built-in self-calibration (BISC) and self-test (BIST) techniques for ADCs;
    • Phase locked loop (PLLs) and Delay locked loops (DLLs) and SC Filters;

  2. RF circuits:
    • RF Quadrature oscillators (LC and RC topologies); LNA/Mixers/IIR filters and complete
    • Transceiver circuits;
    • UWB CMOS radar transceivers;

  3. CAD: Analog Circuit Optimizers:
    • Hybrid equation-based/simulation-based for time-domain optimization of amplifiers
    • Optimization of discrete-time and continuous time sigma delta modulators.
    • Optimization of Filters
    • Modelling and Optimization active/passive RF circuit elements

  4. Biomedical Circuits:
    • Programmable low-power Sigma-Delta ADCs for biomedical applications (ECG, EEG, EMG, AAP) and with extended Dynamic-Range for Hearing Aids;
    • Transimpedance amplifiers for medical imaging (PET) and for accurate blood oxygenation (SPO2) measurements;
    • Low-Power Low-IF receiver/downconverter solutions for medical communications (WMTS: 608 - 614 MHz) and also covering the VHF-III and UHF bands;
    • Portable Low-Cost NMR equipment designed using a 'Gnu-Radio' platform;

  5. Energy Harvesting:
    • DC-DC power converters for solar energy harvesting applications.

The main International Collaborations are:

  • TU-Poznan, Poland (MSc. thesis, joint publications with prof. A. Rybarczyk and Prof. Pawe? ´ Sniata?a);
  • IMSE-CNM, Seville, Spain (MSc. Theses, joint publications with Prof. Francisco Fernandez and Prof. Elisenda Roca Moreno)
  • Federal University of Rio de Janeiro (UFRJ), Brazil, CAPES/FCT (cooperation project, joint publications with Prof. A. Petraglia's team);
  • DTU, Denmark (joint Ph.D. Student supervision in 2007-2011 and joint publications with Prof. Erik Bruun);
  • TU-Delft, Netherlands (joint publications with Prof. C. Verhoeven);
  • University of Alberta, Canada (joint publications with Prof. I. Filanovsky);
  • EIT-ITH, Sweden, (joint publications with Prof. P. Andreani);

Technology transfer as a result of start-ups originated in the group:

  1. Acacia Semiconductor, founded in 2003, was acquired by Silicon and Software Systems LTD (S3) from Ireland in 2007. It currently employs 20 engineers in Lisbon Design Centre.
    We have an ongoing collaboration with S3 Lisbon Design Centre.
  2. Mobbit Systems, founded in 2003, was acquired in 2009 by the Ongoing Group.
  3. Next Silicon was founded in 2012 by the group member Augusto Marques (the PhD student Michael Figueiredo, after finished the theses in 2012, started to work on that company).
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