| 摘要 |
A D/A converter includes a first stage capacitor ladder, a second stage capacitor ladder, a coupling capacitor, (l+m) switches, and a short-circuiting switch. The first stage capacitor ladder includes l capacitors having one side electrodes commonly connected to a first point and capacitances binary-increased from 20.C to 2l-1.C (l is a natural number and C is a unit capacitance). The second stage capacitor ladder includes m capacitors having one side electrodes commonly connected to a second point and capacitances binary-increased from 20.C to 2m-1.C (m is a natural number). The coupling capacitor has a capacitance of 1.C and is connected between the first and second points. The (l+m) switches selectively connects another side electrodes of the (l+m) capacitors to a first or second reference voltage in response to an (l+m)-bit digital input signal. The short-circuiting switch is connected between the first reference voltage and the first point of the first stage capacitor ladder.
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