| 摘要 |
It is object to provide an oversampling circuit and a digital to analog converter capable of realizing a smaller circuit and reducing a cost of parts. The oversampling circuit comprises multiplying section 1, four data holding sections 2-1 through 2-4, four data selectors 3-1 through 3-4, an adding section 4, and two integrating circuits 5-1 and 5-2. Input data is multiplied by four multiplicators by the multiplying section 1, and four multiplication results held, as one set, in the data holding sections. The data selectors read out the data held in the four data holding sections in a predetermined order and generate step function data. The adding section adds the values of four step functions outputted from the respective data selectors, and then digital integrating operations corresponding to the sum are carried out by means of two integrating circuits.
|
