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  • 1
    Electronic Resource
    Electronic Resource
    A Single-Chip CMOS Transceiver Front-End for DCS-1800 Wireless Communications (2000)
    Springer
    Analog integrated circuits and signal processing 24 (2000), S. 83-99 
    Details
    ISSN: 1573-1979
    Keywords: transceiver ; CMOS ; front-end ; wireless ; RF
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract This work describes the design and realization of a low voltage single-chip wireless transceiver front-end in a standard 0.25 μm CMOS technology. The presented prototype integrates the LNA, down-converters, VCO, quadrature generator, up-converter and pre-amplifier on a single die. A high level of integration is achieved by using a low-IF topology for reception, a direct quadrature up-conversion topology for transmission and an oscillator with on-chip integrated inductor. The final objective of this design is to develop a complete transceiver system for wireless communications at 1.8 GHz that can be built with a minimum of surrounding components: only an antenna, a duplexer, a power amplifier and a baseband signal processing chip. The presented circuit consumes 240 mW from a 2.5 V supply and occupies a die area of 8.6 mm2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008326020149
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  • 2
    Electronic Resource
    Electronic Resource
    Adaptive method for cancellation of respiratory artefact in electrogastric measurements (1989)
    Springer
    Medical & biological engineering & computing 27 (1989), S. 57-63 
    Details
    ISSN: 1741-0444
    Keywords: Adaptive filter ; Electrogastrography ; Noise cancellation ; Respiratory artefact
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Electrogastic measurements are useful for medical research and in clinical diagnosis. The measurements, however, contain very heavy respiratory artefact. Existing conventional frequency-domain filters cannot be used because of the possible overlap of the frequencies of the gastric signals and respiratory artefact. In the paper, the methods of measuring cutaneous and intraluminal gastric signals and reference respiratory signals are described. An adaptive cancellation technique is developed, which is simple and easy to implement for online processing. It is proved by experiments to be very efficient, i.e. the respiratory artefact can be completely cancelled, while the gastric signal component is not affected. Other possible applications in biomedical signal analysis are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02442170
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