Pulse or digital communications – Equalizers – Automatic
Reexamination Certificate
2005-09-29
2010-12-07
Corrielus, Jean B (Department: 2611)
Pulse or digital communications
Equalizers
Automatic
C375S350000, C333S02800T
Reexamination Certificate
active
07848402
ABSTRACT:
Methods and circuits are provided for producing phase-adjusted pre-emphasis and equalization. In applications in which little or no phase distortion occurs during signal transmission, propagation, or reception, linear-phase pre-emphasis or equalization can be used to reduce or eliminate phase distortion introduced by the pre-emphasis or equalization. Linear phase, constant group delay FIR filters or circuits may have odd numbers of coefficients symmetrical about the middle coefficient. In applications in which signal phase distortion occurs, linear phase or non-linear phase pre-emphasis or equalization can be used to reduce or compensate for the phase distortion. Phase compensation may be effected using FIR pre-emphasis and equalization filters and circuits. Non-linear phase FIR filters may have different numbers and combinations of coefficients.
REFERENCES:
patent: 4025719 (1977-05-01), Nussbaumer
patent: 4403252 (1983-09-01), Ragan et al.
patent: 5313298 (1994-05-01), Meeker
patent: 5651029 (1997-07-01), Yang et al.
patent: 5815104 (1998-09-01), Jackson et al.
patent: 5892701 (1999-04-01), Huang et al.
patent: 5986972 (1999-11-01), Li
patent: 6212229 (2001-04-01), Salinger
patent: 6263077 (2001-07-01), Zuranski et al.
patent: 6624691 (2003-09-01), Sasaki
patent: 7224725 (2007-05-01), Kim
patent: 7256720 (2007-08-01), Fukuda
patent: 7321620 (2008-01-01), Nakahira et al.
patent: 2001/0009483 (2001-07-01), Satoh et al.
patent: 2001/0031001 (2001-10-01), Gazsi et al.
patent: 2001/0035994 (2001-11-01), Agazzi et al.
patent: 2003/0169809 (2003-09-01), Kim
patent: 2005/0157780 (2005-07-01), Werner et al.
patent: 2006/0140287 (2006-06-01), Alon et al.
patent: 2007/0071083 (2007-03-01), Canagasaby et al.
patent: 2007/0155314 (2007-07-01), Mohebbi
Sohn, Y.-S., Bae, S.-J. Park, H.-J. and Cho, S.-I., “A 1.2 Gbps CMOS DFE receiver with the extended sampling time window for application to the SSTL channel,” IEEE Symposium on VLSI Circuits Digest of Technical Papers. pp. 92-93. Jun. 2002.
Sohn, Y.-S., Bae, S.-J., Park, H.-J., Kim, C.-H. and Cho, S.-I., “A 2.2 Gbps CMOS look-ahead DFE receiver for multidrop channel with pin-to-pin time skew compensation,” Proceedings of the IEEE 2003 Custom Integrated Circuits Conference, pp. 473-476, Sep. 2003.
Zerbe, J. L., et al., “Equalization and clock recovery for a 2.5-10-Gb/s 2-PAM/4-PAM backplane transceiver cell,” IEEE J. Solid-State Circuits, vol. 38, No. 12, pp. 2121-2130, Dec. 2003.
M. Li, S. Wang, Y. Tao, and T. Kwasniewski, “FIR Filter Optimisation as Pre-Emphasis of High-Speed Backplane Data Transmission,” IEEE Electronics Letters, vol. 40, No. 14, pp. 912-913, Jul. 2004.
J. Redd, and C. Lyon, “Spectral Content of NRZ Test Patterns,” EDN Design Feature (www.edn.com), pp. 67-72, Sep. 2, 2004.
Landman, P., et al., “A transmit architecture with 4-tap feedforward equalization for 6.25/12.5Gb/s serial backplane communications,” 2005 IEEE International Solid-State Circuits Conference Digest of Technical Papers, pp. 66-67 and 585, Feb. 2005.
Chen, J., Li, M. and Kwasniewski, T., “Decision feedback equalization for high-speed backplane data communications,” Proceedings of the 2005 IEEE International Symposium on Circuits and Systems. vol. 2. pp. 1274-1277. May 2005.
“Mass noun,” http://en.wikipedia.org/wiki/Mass—noun, accessed on Jan. 27, 2009.
QuickLogic Corporation, “Amphion Fixed Coefficient, Single-Channel FIR Filters,” Sep. 20, 2001, http://www.quicklogic.com/images/amphion—fixed—coef—fir.pdf, accessed on Jan. 27, 2009.
Bereza William
Kwasniewski Tad
Tao Yuming
Wang Shoujun
Altera Corporation
Corrielus Jean B
Ingerman Jeffrey H.
Ropes & Gray LLP
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