| 摘要 |
In a digital/analog converter for converting 2n-bit input digital data into an analog output voltage where n is 2, 3, . . . , 2n capacitors, (n-1) coupling capacitors and 2n analog switches are provided. If k is 1, 2, . . . , n, a (2k-1)-th capacitor has a unit capacitance, and a 2k-th capacitor has a capacitance twice the unit capacitance. A first terminal of the (2k-1)-th capacitor is connected to a first terminal of the 2k-th capacitor. Also, if m is 1, 2, . . . , n-1, an m-th coupling capacitor is connected between the first terminal of the 2m-th capacitor and the first terminal of the (2m+t)-th capacitor, while an (n-1)-th coupling capacitor is connected to the output terminal. If m' is 2, 3, . . . , n-1, the first coupling capacitor has the unit capacitance, and an m'-th one of coupling capacitor has a capacitance of the unit capacitance plus a quarter of the capacitance of an (m'-1)-th coupling capacitors. Each of the analog switches is responsive to one of the 2n input digital data and is connected between a second terminal of one of the capacitors and two power supply sources.
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