Patent ID: 7009539

Claim:
A modulator using a delta-sigma conversion method, and comprising: component separating unit separating a signal component and an error component of a digital input signal from each other, wherein said component separating unit includes a first guantizer quantizing the digital input signal, and an adder adding said digital input signal to said signal component provided from said first quantizer; single-stage delta-sigma modulator modulating the error component separated by said component separating unit; output operating unit operating the signal component separated by said component separating unit and the error component modulated by said single-stage delta-sigma modulator; and an attenuator connected between said adder and said single-stage delta-sigma modulator, and having a coefficient smaller than one, wherein said single-stage delta-sigma modulator includes: a plurality of integrators, a quantizer quantizing an output of an integrator in a final stage, and a delay element delaying an output of said quantizer to perform negative feedback by sending the delayed output to said plurality of integrators.