全新的双极性输出D/A转换器  

A Novel Bipolar Deferent of D/A Converter

作　　者：顾建雄[1] 刘振来[1] 

机构地区：[1]河西学院,甘肃张掖734000

出　　处：《现代电子技术》2006年第6期137-138,共2页Modern Electronics Technique

摘　　要：应用倒∏型电阻网络,在求和放大器的输入端接入一个偏移电流,使输入最高位为1而其他各位输入为0时的输出VO=0,同时将输入的符号位反相后接到一般的D/A转换器的输入,设计了具有双极性输出的D/A转换器。由于倒∏型电阻网络D/A转换器不仅具备权电阻网络D/A转换器的优点,而且拥有倒T型电阻网络D/A转换器的全部优点;所以由他构造的具有双极性输出的D/A转换器将具有更加优越的性能。使其在电子技术领域有更为广泛的应用前景和推广价值。同时用实验证明了所设计电路的正确性。Design bipolar deferent of D/A converter by using inverted -Ⅱ resistance network. The method is connecting a drift current with input terminal of summing amplifier, making output Vo = 0 when MSB is 1, the others is 0, furthermore, connecting reverse MSB with input terminal of general D/A convertor. Because inverted - Ⅱ resistance network D/A convertor not only possess advantages of weightier-resistance network D/A convertor, but also possess all advantages of inverted -T resistance network D/A convertor. The bipolar deferent of D/A converter by using inverted -Ⅱ resistance network possess more superior function, it will be more extensive application of foreground and spread of value in the field of electronic technology. Meanwhile, Using experimental proof validity of the circuit.

关 键 词：倒T型电阻网络 倒Ⅱ型电阻网络 D/A转换器 偏移电流 

分 类 号：TN79[电子电信—电路与系统]