| 摘要 |
PROBLEM TO BE SOLVED: To improve accuracy for a digital-to-analog conversion circuit. SOLUTION: A digital-to-analog conversion circuit 100 outputs an analog voltage V1 according to inputted digital data D1. High and low reference voltages VH and VL are inputted into a first terminal 102 and a second terminal 104. A main DAC (Digital to Analog Converter) 10 outputs the analog voltage V1 according to the digital data D1, based on the two reference voltages VH and VL. A variable impedance circuit 20 is disposed between the first terminal 102 and the second terminal 104 in parallel to the main DAC 10 and its impedance changes according to the digital data D1. The impedance of the variable impedance circuit 20 is adjusted so that a combined impedance of the variable impedance circuit 20 and the main DAC 10 may be substantially constant, regardless of the digital data D1. COPYRIGHT: (C)2008,JPO&INPIT
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