| 摘要 |
To provide a high-speed, high-resolution current mode D/A converter, the present invention provides: (1) a current mode D/A converter comprising a resistor-type D/A converter circuit 2 having a digital decoder circuit 3, a plurality of resistors 5, and a plurality of switches turned on and off by the digital decoder circuit 3 and a highly linear transconductor 4 for receiving voltage output from the resistor-type D/A converter circuit 2 and providing current output; and (2) a transconductor comprising a first transistor differential pair and a second transistor differential pair connected to each other with their polarities reverse and having different transconductance values and current sources connected to the first and second transistor differential pairs respectively, wherein different signal voltages being proportional to input signal voltages input to the transconductor are applied to the first and second transistor differential pairs.
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