Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Reexamination Certificate
2004-09-02
2009-08-18
Nguyen, Khai M (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
C341S155000
Reexamination Certificate
active
07576670
ABSTRACT:
The invention relates to a sigma-delta analogue/digital converter for an xDSL multi-standard input stage for converting an xDSL signal into a digital output signal, where the sigma-delta analogue/digital converter (1) has: an analogue loop filter (6) which filters an analogue difference signal between the xDSL signal to be converted and a feedback signal in order to produce a filter output signal; a quantizer which quantizes the filter output signal from the analogue loop filter (6) in order to produce the digital output signal; a first digital/analogue converter (16) which converts the digital output signal into the analogue feedback signal; where the analogue loop filter (6) has at least two resonator filter stages (6a,6b) which respectively comprise a first integrator (6a-1; 6b-1) and a second integrator (6a-2; 6b-2) connected in series therewith, where the second integrator (6a-2; 6b-2) can be connected to the first integrator (6a-1, 6b-1) by means of a controllable feedback switch (6a-3, 6b-3) in order to close a local feedback loop, where the integrator outputs can respectively be connected by means of a controllable switch (25) to a signal input of an adder (27) which adds the output signals from the integrators in order to produce the filter output signal.
REFERENCES:
patent: 6400297 (2002-06-01), Tucker
patent: 6954159 (2005-10-01), Cooper et al.
patent: 2004/0036640 (2004-02-01), Kawamura
International Search Report and Notification of Transmittal dated Sep. 2, 2004.
Botteron et al., “Design and Switched-Capacitor Implementation of a New Cascade-of-Resonators Σ—Δ Converter Configuration,”IEEE Circuits and Systems, May 30-Jun. 2, 1999, pp. 45-48.
Giandomenico et al., “A 15 MHz Bandwidth Sigma-Delta ADC with 11 Bits of Resolution in 0.13 μm CMOS,”European Solid-State Circuits, Conference in Piscataway, NJ, Sep. 16-18, 2003.
Hamoui et al., “Delta-Sigma Modulator Topologies for High-Speed High-Resolution A/D Converters,”2002 45thMidwest Symposium on Circuits and Systems, Tulsa, OK, Aug. 4-7, 2002.
Clara Martin
Di Giandomenico Antonio
Hauptmann Joerg
Wiesbauer Andreas
Infineon - Technologies AG
Jenkins Wilson Taylor & Hunt, P.A.
Nguyen Khai M
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