专利内容由知识产权出版社提供
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：EP0448328B1公开日：19951206
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 ofthe 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 (+VT, -VT) 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 a
temperature-dependent variation in a characteristic of the one of the resistanceelements.
申请人：FUJITSU LTD
地址：JP
国籍：JP
代理机构：Billington, Lawrence Emlyn
更多信息请下载全文后查看