Stable high-order delta-sigma error feedback modulators, and...

Details Stable high-order delta-sigma error feedback modulators, and... Stable high-order delta-sigma error feedback modulators, and...

2005-05-03

2005-05-03

Tokar, Michael (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S144000

Reexamination Certificate

active

06888484

ABSTRACT:
Stable, robust, and high-resolution delta-sigma error feedback modulators, such as those used in digital-to-analog converters and phase-locked loops, include an L-order noise transfer function that is provided with L+1 high-order bits from a truncation element. The stability of such delta-sigma error feedback modulators is independent of the input signal. Moreover, the out-of-band gain of the noise transfer function need not be limited, which improves the resolution and the signal-to-noise ratio of the in-band signal.

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Willingham, Scott, Perrott, Michael, Setterberg, Brian, Grzegorek, Andrew and McFarland, Bill, “An Integrated 2.5GHzΣΔσ Frequency Synthesizer with 5 μ s Setting and 2MB/s Closed Loop Modulation,”2000 IEEE Journal of Solid-State Circuits Conference, pp. 200-201 (Feb. 2000).
Filiol, Norman M., Riley, Thomas A. D., Plett, Calvin and Copeland, Miles A., “An Agile ISM Brand Frequency Synthesizer with Built-In GMSK Data Modulation,”IEEE Journal Of Solid-State Circuits, vol. 33, No. 7, pp. 998-1008 (Jul. 1998).
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Schreier, Richard, Yang, Yaohua, “Stability Tests for Single-Bit Sigma-Delta Modulators with Second-Order FIR Noise Transfer Functions,”Proc. IEEE Int. Symp. Circuits Syst., pp. 1316-1319 (May 1992).

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