Digital transmitter

Details Digital transmitter Digital transmitter

2006-08-31

2009-08-25

Ghebretinsae, Temesghen (Department: 2611)

Pulse or digital communications

Transmitters

C375S229000

Reexamination Certificate

active

07580474

ABSTRACT:
An equalizer provided in a digital transmitter compensates for attenuation in a signal channel to a digital receiver. The equalizer generates signal levels as a logical function of bit history to emphasize transition signal levels relative to repeated signal levels. The preferred equalizer includes an FIR transition filter using a look-up table. Parallel circuits including FIR filters and digital-to-analog converters provide a high speed equalizer with lower speed circuitry. The equalizer is particularly suited to in-cabinet and local area network transmissions where feedback circuitry facilitates adaptive training of the equalizer.

REFERENCES:
patent: 3593142 (1971-07-01), Freeny et al.
patent: 3777130 (1973-12-01), Crosier et al.
patent: 3906400 (1975-09-01), Gooding et al.
patent: 3909510 (1975-09-01), Luce
patent: 3914588 (1975-10-01), Nussbaumer
patent: 3987288 (1976-10-01), Franks
patent: 4068105 (1978-01-01), Jain et al.
patent: 4374426 (1983-02-01), Burlage et al.
patent: 4535443 (1985-08-01), Korevaar
patent: 4556983 (1985-12-01), Heitmann et al.
patent: 4797898 (1989-01-01), Martinez
patent: 4849957 (1989-07-01), Suzuki
patent: 5008903 (1991-04-01), Betts et al.
patent: 5119402 (1992-06-01), Ginzburg et al.
patent: 5140613 (1992-08-01), Birgenheier et al.
patent: 5412691 (1995-05-01), Ginzburg et al.
patent: 5418670 (1995-05-01), McClure et al.
patent: 5521946 (1996-05-01), Main
patent: 5608757 (1997-03-01), Smith et al.
patent: 5655078 (1997-08-01), Anderson et al.
patent: 5778029 (1998-07-01), Kaufmann
patent: 5805089 (1998-09-01), Fielder et al.
patent: 5966032 (1999-10-01), Elrabaa et al.
patent: 5983070 (1999-11-01), Georges et al.
patent: 6266379 (2001-07-01), Dally
patent: 6542555 (2003-04-01), Dally
patent: 7099404 (2006-08-01), Dally
patent: 2004/0125887 (2004-07-01), Dryden et al.
patent: 2006/0291585 (2006-12-01), Dally
patent: 2006/0291586 (2006-12-01), Dally
patent: 2006/0291587 (2006-12-01), Dally
patent: 2007/0002966 (2007-01-01), Dally
patent: 2007/0002967 (2007-01-01), Dally
patent: 2007/0041468 (2007-02-01), Dally
patent: 2007/0041469 (2007-02-01), Dally
patent: 62-248330 (1987-10-01), None
National Semiconductor Product Folder, “CLC014, Adaptive Cable Equalizer for High Speed Data Recovery,” Feb. 26, 1997, pp. 1-3.
National Semiconductor Product Folder,“Comlinear CLC014, Adaptive Cable Equalizer for High-speed Data Recover,” Aug. 1996, pp. 1-12.
De Man, Hugo J. et al., “High-speed NMOS Circuits for ROM-Accumulator and Multiplier Type Digital Filters,” IEEE Journal of Solid-State Circuits, vol. SC-13, No. 5, Oct. 1978, pp. 565-572.
Fledler, Alan et al., “PF 15:1: A 1.0625Gbps Transceiver with 2X-Oversampling and Transmit Signal Pre-Emphasis,” IEEE International Solid-State Circuits Conference, Feb. 7, 1997, pp. 238-239.
Schröder, Hartmut, “High Word-Rate Digital Filters with Programmable Table Look-Up,” IEEE Transactions on Circuits and Systems, May 1997, pp. 277-279.
Dally, William J. et al., “Transmitter Equalization for 4-Gbps Signaling,” IEEE Micro, vol. 17, No. 1, Jan./Feb. 1997, pp. 48-56.
Holte, et al., “A New Digital Echo Canceler for Two-Wire Subscriber Lines,” IEEE Transactions on Communications, vol. COM-29, No. 11, pp. 1573-1581 (Nov. 1981).
Forney, et al., “Combined Equalization and Coding Using Precoding,” IEEE Communications Magazine, pp. 25-34 (Dec. 1991).
Kobayashi, “Coding Schemes for Reduction of Intersymbol Interface in Data Transmission Systems,” IBM J. Res. Develop., Reduction of Intersymbol Interference, pp. 343-353 (Jul. 1970).
Vanderaar, et al., “Transmit Pulse Shaping Filters and Cordic Algorithm Based Precompensation for Digital Satellite Communications,” IEEE, pp. 1219-1222, (1997).
Fielder, et al., “A 1.0625Gbps Transceiver with 2x-Oversampling and Transmit Signal Pre-Emphasis,” 1997 IEEE International Solid-State Circuits Conference, Session 15, pp. 238-239, 464 (Feb. 7, 1997).
Ginzburg, et al., “FDDI over Unshielded Twisted Pairs,” IEEE, pp. 395-398 (1990).
Shih, et al., “10 Mb/s Twisted Pair CMOS Transceiver with Transmit Waveform Pre-Equalization,” IEEE 1991 Custom Integrated Circuits Conference, pp. 7.3.1-7.3.4 (1991).
Dally, William J., et al., “Transmitter Equalization for 4Gb/s Signaling,” Hot Interconnects IV, 10 pgs. (1996).
Komizo, et al., “A 7 GHz FM Transmitter Utilizing GaAs Power MESFETS,”IEEE; vol. 77, issue 1, pp. 243-245 (Jun. 1977).
Wang, et al., “A MonolithicKa-Band 0.25-μm GaAs MESFET Transmitter for High vol. Production,”IEEE Journal of Solid-State Circuits; vol. 27, No. 10, pp. 1397-1404 (Oct. 1992).
Raffaelli, et al., “A Low Cost 77 GHz Monolithic Transmitter for Automotive Collision Avoidance Systems,”IEEE Microwave and Millimeter-Wave Monolithic Circuits Symposium; pp. 63-66 (Jun. 14-15, 1993).

Affiliated with

Also associated with

Rating

Digital transmitter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Digital transmitter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital transmitter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4069295