| 摘要 |
PCT No. PCT/FI95/00312 Sec. 371 Date Jan. 14, 1997 Sec. 102(e) Date Jan. 14, 1997 PCT Filed Jun. 1, 1995 PCT Pub. No. WO95/34955 PCT Pub. Date Dec. 21, 1995The invention relates to an oversampled high-order modulator, especially a sigma-delta modulator, comprising cascaded integrators in a number corresponding to the order of the modulator, a quantizer, and a negative feedback. The problem with the high-order modulator is that the modulator is locked in an unstable mode from which it should be restored without considerably interfering with the operation of the modulator. The invention achieves this by temporarily changing the value of the negative feedback to a direction which will restore the stable operation.
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