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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Analog integrated circuits and signal processing 8 (1995), S. 145-155 
    ISSN: 1573-1979
    Keywords: digital-to-analog conversion ; CMOS steering-current techniques ; multiplying functions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract This paper discusses the design and integrated circuit implementation of two alternative solutions for realizing an 8-bit high-speed steering-current multiplying digital-to-analog converter based on a current-source-array architecture. In the first solution, designated as voltage-controlled-current-source operation, a reference voltage is used to drive directly the gate-to-source voltage of the current-sources while in the second solution, designated as geometry-programmable-current-source operation, the current-sources are generated using a digitally programmable transistor-array. The characteristics of both solutions are discussed from the viewpoints of the accuracy and distortion introduced by the multiplying function. For demonstration purposes a prototype chip suitable for both operating modes has been fabricated in a single-poly 1.2µm CMOS digital technology. At 5 V supply and 13.3 mA full-scale output current, the chip dissipates about 90 mW for a sampling frequency of 50 MHz. The die area is approximately 1.75 mm2.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    European archives of oto-rhino-laryngology and head & neck 257 (2000), S. 279-282 
    ISSN: 1434-4726
    Keywords: Key words Head and neck cancer ; Intra-arterial ¶chemotherapy ; Carboplatin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract To evaluate the feasibility, maximum dose of drug tolerated, technical problems, systemic and local toxicity, response rate, overall and disease-free survival, we studied superselective intra-arterial infusion of high-dose carboplatin as part of a multimodality treatment for head and neck cancer. Forty patients with untreated stage II–IV head and neck squamous cell carcinomas received induction chemotherapy with high-dose carboplatin (three cycles at 2-week intervals using 300–350 mg/m2 per cycle), delivered via superselective transfemoral angiography followed by radiotherapy or surgery plus radiotherapy. No technical complications occurred during or after the infusion. Systemic toxicity was minimal, and local toxicity was moderate. At the end of chemotherapy the overall complete and partial response rate was 90% (36/40) at the primary site and 64% (16/25) at the neck nodes. The median follow-up was 24.4 months (range 3–52). To date 21 patients are alive without disease, 2 are alive with disease, 13 have died of disease, and 4 have developed a metachronous lung tumor. There was a good correlation between the response to chemotherapy and disease-free survival. No statistically significant benefit in survival was observed with respect to other series of head and neck tumors treated with different protocols. However, discriminating between responding and nonresponding patients, this procedure can have a prognostic significance in planning integrated treatments for these types of tumors.
    Type of Medium: Electronic Resource
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