Digital-to-analog converter having a circuit for c

专利名称：Digital-to-analog converter having a circuit

for compensating for variation in outputdependent on temperature change

发明人：Yasutake, Nobuyuki,Yabara, Hidefumi申请号：EP91302323.0申请日：19910318公开号：EP0448328A3公开日：19930602

专利附图：

摘要：A D/A converter converting a digital signal having n bits (n is an integer) into ananalog signal includes constant-current output circuits (1₂₀ - 1₁), provided for the n bits of

the digital signal, for selectively generating n constant currents on the basis of the n bitsof the digital signals. The n constant currents have mutually different current values withrespect to the n bits of the digital signal. The constant-current output circuits haveresistance elements (14₂₀ - 14₁) respectively provided for the n bits of the digital signal.The resistance elements define the mutually different current values. The D/A converteralso includes an output circuit (15) for adding the n constant currents to each other andfor outputting the analog signal based on an addition result, and a temperature-dependent voltage generating part (25 - 33) for generating a temperature-dependentvoltage (+V, -V) which changes as a temperature around the D/A converter changes.Further, the D/A converter includes a current compensation part (34₂₀ - 34₁₃, 54₂₀) forgenerating a compensation voltage related to at least one of the resistance elementsfrom the temperature-dependent voltage and for applying the compensation voltage tothe one of the resistance elements. The compensation voltage compensates for atemperature-dependent variation in a characteristic of the one of the resistanceelements.

申请人：FUJITSU LIMITED

地址：1015, Kamikodanaka, Nakahara-ku Kawasaki-shi, Kanagawa 211 JP

国籍：JP

代理机构：Billington, Lawrence Emlyn

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