High-resolution sigma-delta converter

Details High-resolution sigma-delta converter High-resolution sigma-delta converter

2007-01-02

2007-01-02

Mai, Lam T. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S155000

Reexamination Certificate

active

11168009

ABSTRACT:
A sigma-delta converter is disclosed. In one embodiment, the sigma-delta converter includes two series-connected converter stages which are each supplied with a feedback signal, a comparator stage which is connected downstream of the second converter stage, which is supplied with the output signal from the second converter stage and which provides an at least two-value comparator signal, and at least one output stage which has at least one digital integrator and which produces a multibit signal as output signal. The sigma-delta converter also has a first feedback look, which is supplied with the output signal and which has a multibit digital-analog converter which is supplied with the output signal and which converts this output signal into a first feedback signal with an amplitude that is dependent on the output signal, and a second feedback loop, which is supplied with the comparator signal, having a digital-analog converter which converts a signal that is dependent on the comparator signal into the second feedback signal.

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Sansen W. et al.: Analog Circuit Design -Mixed A/D Circuit Design, Sensor Interface Circuits and Communication Circuits. In: Kluwer Academic Publishers, second printing 1996, Seiten, pp. 163-181, no month.
Modl S. et al.: 14 bit ΣΔ Modulator with Multi Bit Feedback. In: Proceedings of the 22nd European Solid-State Circuits Conference, 1996, Neuchatel, Switzerland, Seiten, pp. 224-227, no month.

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