Pulse or digital communications – Receivers
Reexamination Certificate
2007-02-06
2007-02-06
Fan, Chieh M. (Department: 2611)
Pulse or digital communications
Receivers
Reexamination Certificate
active
10251663
ABSTRACT:
An improved complex-IF digital receiver has various improvements. The improved complex-IF digital receiver, for single or dual band applications, preferably synchronizes all of the signals to each other, which may be an integer multiple of each other. For example, the decimation filter, delta-sigma modulator, sensitivity DAC, and other circuits in the receiver can be synchronized. The delta-sigma modulator preferably includes a comparator whose input is coupled to a sensitivity DAC or synchronous dithering circuit. Ideally, the sensitivity DAC forces the comparator to trigger at every clock cycle and reduces the effect of hysteresis and offset at the input of the comparator. The receiver includes a translation circuit that translates an intermediate frequency signal to baseband, where the translation circuit preferably operates a translation ratio that is a multiple of 4.
REFERENCES:
patent: 5003621 (1991-03-01), Gailus
patent: 5557642 (1996-09-01), Williams
patent: 5640698 (1997-06-01), Shen et al.
patent: 5729230 (1998-03-01), Jensen et al.
patent: 5757867 (1998-05-01), Caulfield et al.
patent: 5982315 (1999-11-01), Bazarjani et al.
patent: 6005506 (1999-12-01), Bazarjani et al.
patent: 6064871 (2000-05-01), Leung
patent: 6094458 (2000-07-01), Hellberg
patent: 6243430 (2001-06-01), Mathe
patent: 6356594 (2002-03-01), Clement et al.
patent: 6366622 (2002-04-01), Brown et al.
patent: 6393070 (2002-05-01), Reber
patent: 6421534 (2002-07-01), Cook et al.
patent: 6429797 (2002-08-01), Wu
patent: 6459743 (2002-10-01), Lipka
patent: 6545728 (2003-04-01), Patel et al.
patent: 6560294 (2003-05-01), Gatherer
patent: 6577258 (2003-06-01), Ruha et al.
patent: 6590943 (2003-07-01), Ali
patent: 6611569 (2003-08-01), Schier et al.
patent: 6611570 (2003-08-01), Subramanian
patent: 6654594 (2003-11-01), Hughes et al.
patent: 6670938 (2003-12-01), Yoshida
patent: 6954628 (2005-10-01), Minnis et al.
patent: 2004/0041623 (2004-03-01), Andrews
Schreier at al., “A Flexible 10-300 MHz Receiver IC Employing a Bandpass Sigma-Delta ADC”, Radio Frequency Integrated Circuits Symposium, 2001. Digest of Papers. 2001 IEEE, May 20-22, 2001, pp. 71-74.
Candy, JC et al., Oversampling Delta-Sigma Data Converters, IEEE Press, New York, 1992, pp. 1-29.
Cherry, JA et al., Clock Jitter and Quantizer Metastability in Continuous-Time Delta-Sigma Modulators, IEEE Transactions on Circuits and Systems—II: Analog and Digital Signal Processing, vol. 46, No. 6, Jun. 1999, pp. 661-676.
Cherry, JA et al., Excess Loop Delay in Continuous-Time Delta-Sigma Modulators, IEEE Transactions on Circuits and Systems—II: Analog and Digital Signal Processing, vol. 46, No. 4, Apr. 1999, pp. 376-389.
Crochiere, RE et al., Multirate Digital Signal Processing, Prentice-Hall Inc., Englewood Cliffs, N.J., 1983, pp. 143-183.
Horstman, JU et al., Metastability Behavior of CMOS ASIC Flip-flops in Theory and Test, IEEE Journal of Solid-State Circuits, vol. 24, No. 1, Feb. 1989, pp. 146-157.
Jensen, JF et al., A 3.2-GHZ Second-Order Delta—Sigma Modulator Implemented in InP HBT Technology, IEEE Journal of Solid-State Circuits, vol. 30, No. 10, Oct. 1995, pp. 1119-1127.
Norsworthy, SR, et al., Delta-Sigma Data Converters Theory, Design, and Simulation, IEEE Press, New York, 1997.
Proakis, JG et al., Advanced Digital Signal Processing, Macmillan Publishing Co., New York, 1992, pp. 142-151.
Razavi, B., Considerations for Direct-Conversion Receivers, IEEE Transactions on Circuits and Systems—II: Analog and Digital Signal Processing, vol. 44, No. 6, Jun. 1997, pp. 428-435.
Dagher Elias
Dinh Thang Victor
Hoo Keith Soo
Masenten Wesley K.
Stubberud Peter
DiTrans IP, Inc.
Fan Chieh M.
Nguyen Dung X.
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