Patent ID: 6734814
Filing Date: 2004-05-11
Classification: H03M

Abstract:
A modulator that employs an over-sampling delta-sigma conversion system, the modulator comprising:an attenuating unit which attenuates an input signal to produce an attenuated signal; a delay unit which gives a delay of 1 sample period to the attenuated signal to produce a delayed signal; a subtracting unit which subtracts a quantitized signal that has been fed back with a delay of 1 sample period from the delayed signal to produce a subtracted signal; integrating units provided in n-stages, where n is an integer is equal to or larger than 2, which integrate the subtracted signal to produce an integrated signal; an adding unit which adds the integrated signal output from each integrating unit and the attenuated signal to produce an added signal; and a quantitizing unit which quantitizes the added signal to produce an output signal, outputs the output signal and feeds back the output signal to the subtracting unit.