| 摘要 |
PROBLEM TO BE SOLVED: To provide aΔΣ-type D/A converter capable of suppressing mixing of noise, from a digital circuit to an analog output signal. SOLUTION: TheΔΣ-type D/A converter includes: aΔΣmodulator 1a for converting a multi-bit digital input signal into a 1-bit digital output signal; an analog filter 2a for eliminating the high-frequency components of the output signal of theΔΣmodulator 1a and outputting an analog output signal; an isolation element 3a, provided between theΔΣmodulator 1a and the analog filter 2a, and converting the output signal of theΔΣmodulator 1a into a non-electrical signal and thereafter restoring the non-electrical signal to an electrical signal and inputting the electrical signal to the analog filter 2a. The ground of a digital module 100 that includes theΔΣmodulator 1a and the ground of an analog module 101 including the analog filter 2a are separated from each other. COPYRIGHT: (C)2008,JPO&INPIT
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