A 10 bit 50 MS/s CMOS D/A Converter with 2.7 V Power Supply

Takahiro MIKI
Keisuke OKADA
Yasutaka HORIBA

IEICE TRANSACTIONS on Electronics   Vol.E76-C    No.5    pp.738-745
Publication Date: 1993/05/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Low-Power and Low-Voltage Integrated Circuits)
low supply voltage,  D/A converter,  video system,  battery powered system,  

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It has become an important subject to realize a high-speed D/A converter with low supply voltage. This paper discusses a 10 bit 50 MS/s CMOS D/A converter with 2.7 V power supply. Reduction of the supply voltage is achieved by developing "saturation-linear" biasing technique in current sources. In this scheme, a grounded transistor in cascode configuration is biased in linear region. High conversion rate is obtained by driving this grounded transistor directly. A charging transistor is also introduced into the current source for accelerating the settling time. The D/A converter is fabricated in a 1 µm CMOS process without using optional process steps. It successfully operates at 50 MS/s with 2.7 V power supply. The circuit techniques discussed here can be easily introduced into half-micron D/A converters.