Patent ID: 6927720
Filing Date: 2005-08-09
Classification: H03M

Abstract:
1. A multi-level analog signal outputting circuit receiving as an input codes corresponding to 2N (−N, −N+1, . . . , −2, −1, 1, 2, . . . , N−1, N, where N being an integer not less than 2) levels, for outputting an analog signal corresponding to the input code, said multi-level analog signal outputting circuit comprising: N pieces of unit analog circuits each outputting an analog signal corresponding to a level “−1” or “1”; a circuit for outputting an analog signal corresponding to a code −N or N, by summing outputs of the N pieces of unit analog circuits together, when the code corresponding to −N or N is input, and for outputting an analog signal corresponding to a code −M or M, M being an integer such that 1 ≦M≦N−1, by summing outputs of M unit analog circuits, selected from the N pieces of unit analog circuits, when the code corresponding to −M or M, is input; and a circuit for sequentially switching, each time the same code corresponding to the −M or M is input, the selected M unit analog circuits to respective different combinations of M unit analog circuits, in accordance with combinations afforded from the N pieces of unit analog circuits by