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WEIGHTING CONSTANT CURRENT SOURCE AND D/A CONVERTER
WEIGHTING CONSTANT CURRENT SOURCE AND D/A CONVERTER
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机译：加权恒定电流源和D / A转换器
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摘要
PROBLEM TO BE SOLVED: To provide a weighting constant current source, where a chip area can be reduced and the increase of manufacture cost can be prevented and to provide a D/A converter.;SOLUTION: A voltage power source 8, resistors 3 to 6 and a current source 2 are connected in series. The bases of a plurality of transistor in the same sizes are connected to respective connection points. An R-2R resistance network 7 is connected to the emitters of the respective transistors. When the current value of the current source 2 is set to K.(1/R0)(kT/q) and the values of the respective resistance values to (R0.ln2)/K, currents flowing in the transistors connected to the right of the resistors are halved, as compared to currents flowing in the transistors connected to the left.;COPYRIGHT: (C)2001,JPO
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