Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1994-01-06
1996-07-09
Hoff, Marc S.
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
341144, H03M 166
Patent
active
055348637
ABSTRACT:
A digital-to-analog (D/A) converter eliminates matching requirements and does not generate harmonics or noise. The D/A converter has an array of injectors for converting an input word to an analog voltage. A plurality of clocked switches discharge the injector array and the feedback path when switched into a first phase position and transfer the injector signal across the feedback path to the output of the D/A converter when switched to a second phase position. The conversion period, the time in which the digital input word is converted to an analog output voltage, is divided into N-1 subperiods. Each injector is enabled once or not at all for each subperiod such that the weighted signal injected during a single conversion period is constant and such that all the injectors in the array contribute an equal amount of signal during a conversion period.
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Peter J. A. Naus, Eise C. Dijkmans, Eduard F. Stikvoort, Andrew J. McKnight, David J. Holland, and Werner Bradinal, "A CMOS Stereo 16-bit D/A Converter for Digital Audio," IEEE J. Solid-State Circuits, vol. SC-22, Jun. '87, pp. 486-490.
"CSZ5316: 16-Bit, 20 kHz Oversampling A/D Converter" data sheets, Crystal Semiconductor Corporation, Aug. 1987, 7 pp.
Everitt James W.
Takatori Hiroshi
Hoff Marc S.
Level One Communications Inc.
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