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
URL:
http://dx.doi.org/10.1007/BF01239107
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