| 摘要 |
PROBLEM TO BE SOLVED: To reduce errors when digitizing DC signals in aΔΣtype AD converter and to achieve high accuracy, by eliminating disturbance and dead zone of characteristics near the origin of the input/output characteristics of theΔΣtype AD converter, while the disturbance and dead zone of the characteristics are generated, when input signals become near 0 in the case of handling DC as the input signals. SOLUTION: ThisΔΣtype AD converter is constituted of an integrator 2 for integrating the sum of the input signals, the output of a local DA converter 11 and the output of a dither 1, a quantizer 3 for quantizing the output of the integrator 2, a delay device 4 for delaying the output of the quantizer 3, the local DA converter 6 for outputting the voltage level of 2 levels decided beforehand by the signals of the delay device 4 and a decimeter 5 for calculating the time average of the output of the delay device 4.
|
