Sigma-delta converter with noise suppression

Details Sigma-delta converter with noise suppression Sigma-delta converter with noise suppression

2006-03-21

2006-03-21

JeanPierre, Peguy (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S159000

Reexamination Certificate

active

07015843

ABSTRACT:
A digital input signal passes through a principal path, containing at least one sigma-delta modulator having a transmission function and a digital-to-analog converter, and at least one parallel path, connected in parallel to the principal path and having at least one sigma-delta modulator and a digital-to-analog converter. The sigma-delta converter produces an analog output signal by summing the analog output signals of the principal and parallel paths. A differential signal from which at least the noise outside a useful band has been filtered is obtained from the digital output signal of the sigma-delta modulator of the principal path and the input signal that has been spectrally formed by a filter, according to the transmission function of the sigma-delta modulator in the principal path. This differential signal is supplied as the input signal to the sigma-delta modulator in the parallel path(s).

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Steven R. Norsworthy et al.; Delta-Sigma Data Converters: Theory Design, and Simulation, IEEE Press, 1996, pp. i-xxiii and 1-476, no date.

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