A second-order oversampled sigma-delta modulator for bandpass signals

A method of realizing sigma-delta modulation is presented that allows the noise spectrum to be shaped according to a chosen noise response weighting. The specific case of a second-order modulator having a noise null that can be located anywhere in the frequency range is derived. This can be advantag...

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Bibliographic Details
Main Author: Horrocks, D.H.
Format: Conference Proceeding
Language:English
Subjects:
Circuit noise
Delta-sigma modulation
Filtering theory
Filters
Frequency
Noise shaping
Quantization
Sampling methods
Speech
Systems engineering and theory
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Summary:A method of realizing sigma-delta modulation is presented that allows the noise spectrum to be shaped according to a chosen noise response weighting. The specific case of a second-order modulator having a noise null that can be located anywhere in the frequency range is derived. This can be advantageous since it allows the null to be located within the pass-band of band-pass signals such as speech. Applications could be possible, for example, to ADCs and DACs for higher frequency modulated-carrier signals.< >
DOI:10.1109/ISCAS.1991.176709