| 摘要 |
PURPOSE: A digital/analog converter is provided to reduce a turn-on resistance of an NMOS transistor of a switching unit by applying the electric potential of high level to a gate of the NMOS transistor of the switching unit. CONSTITUTION: A digital/analog converter includes a resistance sequence(20), a plurality of invert/level shifters(21-1 to 21-4), and a plurality of switching unit(22-1 to 22-4). The resistance sequence(20) is formed with a plurality of resistors in order to generate analog signals corresponding digital signals. The invert/level shifters(21-1 to 21-4) are used for inverting the digital codes and elevating the operating levels of the digital codes to higher levels. The switching units(22-1 to 22-4) are selectively operated according to the digital codes and the output signals of the invert/level shifters(21-1 to 21-4) in order to pass the analog signals of the resistance sequence(20).
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