| 摘要 |
An analog signal outputting circuit comprises two unit analog circuits for outputting an analog signal, corresponding to levels "-1" or "1", and a low-pass filter for smoothing the analog signal output from the two unit analog circuits, as selected by codes output from the four-valued delta-sigma modulator. In case the input signal is -2 or +2, outputs of the unit analog circuits are summed together to output an analog signal corresponding to -2 or +2. In case the input signal is -1 or +1, outputs of the unit analog circuits are alternately used to output an analog signal corresponding to -1 or +1 to reduce the non-linearity error resulting from variations in the analog devices.
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