Pulse or digital communications – Pulse code modulation – Differential
Reexamination Certificate
2005-07-19
2005-07-19
Tse, Young T. (Department: 2637)
Pulse or digital communications
Pulse code modulation
Differential
C341S143000
Reexamination Certificate
active
06920182
ABSTRACT:
The invention discloses a system and method for improving the out-of-band noise response of a multi-order delta-sigma modulator. The system and method includes programmable delta-sigma modulators which may be programmed to vary the reference signals at each modulator stage subsequent to the first stage relative to the reference signal of the first modulator stage. The resulting signal output will then typically exhibit the enhanced noise suppression characteristics of a dithered signal without the added circuitry and power required of a dithering apparatus.
REFERENCES:
patent: 4748626 (1988-05-01), Wong
patent: 4873688 (1989-10-01), Maki et al.
patent: 4920544 (1990-04-01), Endo et al.
patent: 5173695 (1992-12-01), Sun et al.
patent: 5191332 (1993-03-01), Shieu
patent: 5196850 (1993-03-01), Duffy et al.
patent: 5414424 (1995-05-01), Cabler
patent: 5648779 (1997-07-01), Cabler
patent: 5760722 (1998-06-01), Harris et al.
patent: 5896056 (1999-04-01), Glucina
patent: 6067036 (2000-05-01), Mauthe et al.
patent: 6175728 (2001-01-01), Mitama
patent: 6255977 (2001-07-01), Jelonnek et al.
patent: 6373417 (2002-04-01), Melanson
patent: 6469684 (2002-10-01), Cole
patent: 6538589 (2003-03-01), Okuda et al.
patent: 6570452 (2003-05-01), Sridharan
patent: 6570518 (2003-05-01), Riley et al.
patent: 6717998 (2004-04-01), Adachi et al.
patent: 0 450 984 (1991-10-01), None
patent: 0840485 (1998-05-01), None
patent: WO 01/17116 (2001-03-01), None
DSPatch, The Digital Signal Processing Applications Newsletter, “Sigma-Delta Conversion Technology”, Winter 1990, pp. 1-15.
Candy, James C. et al; “Oversampling Methods for A/D and D/A Converstion”, pp. 1-29.
Norsworthy, Steven R.; AT&T Laboratories Allentown Pennsylvania; “Effective Dithering of Sigma-Delta Modulators,” 1992; pp. 1304-1307.
Microwaves & RF; “Technique Enhances The Performance of PLL Synthesizers,” Jan. 1993; pp. 61-64.
Hill, Cris: Sciteq/Osicom; Applied Microwave & wireless “All Digital Fractional-N Synthesizer for High Resolution Phase Locked Loops”; Nov.-Dec. 1997; pp. 62-69.
Miller, Brian et al; IEEE; “A Multiple Modulator Fractional Divider”; 1990; pp. 559-568.
Filiol, Norman et al; IEEE Journal of Solid-State Circuits vol. 33 No. 7; “An Agile ISM Band Frequency Synthesizer with Built-In GMSK Data Modulator”; Jul. 1998; pp. 998-1008.
Riley, Tom et al; IEEE Journal of Solid-State Circuits vol. 28 No. 5 “Delta-Sigma Modulation in Fractional-N Frequency Synthesis”; May 1993; pp. 553-559.
Erickson, Grant; Department of Electrical Engineering Univ. of Minnesota; “A Fundamental Introduction to the Compact Disc Player”; Nov. 29, 1994; pp. 1-19.
Foreign Search Report, dated Feb. 4, 2004, 3 pages.
Noel Boutin, University of Sherbrooke, RF Design, rf featured technology, “Complex Signals: Part 1,” Dec. 1989, pp. 27-33.
Noel Boutin, University of Sherbrooke, RF Design, rf signals, “Complex Signals: Part II,” Jan. 1990, pp. 57-64, 66.
Noel Boutin, University of Sherbrooke, RF Design, rf signals, “Complex Signals: Part III, Frequency Shifting Complex Signals,” Mar. 1990, pp. 109-111, 113-115.
Noel Boutin, University of Sherbrooke, RF Design, rf signals, “Complex Signals: Part IV,” May 1990, pp. 65-70, 73-75.
Shoji Otaka, et al., 1994 IEEE, 1994 Bipolar/BiCMOS Circuits & Technology Meeting, “A Low Local Input Power 1.9 GHz Si-Bipolar Quadrature Modulator without Any Adjustment,” 1994, pp. 171-174.
Angel Boveda, et al., 1993 IEEE, ISSCC 93/Session 9/Radio Communication Circuits/Paper TP 9.3, “TP 9.3: A 0.7-3GHz GaAs QPSK/QAM Direct Modulator,” 1993, pp. 142-143.
D. Stoneback, et al., “Distortion Beat Characterization and the Impact on QAM BER Performance,” pp. 1-27.
Fulbright & Jaworski LLP
Microtune ( Texas), L.P.
Tse Young T.
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