Patents Assigned to ClariPhy Communications, Inc.
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Patent number: 8094056Abstract: A lookahead pipelined ADC architecture uses open-loop residue amplifiers with calibration. This approach is able to achieve a high-speed, high-accuracy ADC with reduced power consumption. In one aspect, an ADC pipeline unit includes a plurality of lookahead pipeline stages (i.e., an ADC lookahead pipeline) coupled to a calibration unit. The ADC lookahead pipeline uses open-loop residue amplifiers. The calibration unit compensates for non-linearity in the open-loop amplifiers.Type: GrantFiled: September 15, 2008Date of Patent: January 10, 2012Assignee: Clariphy Communications, Inc.Inventors: Ali Nazemi, Georgios Asmanis, German Cesar Augusto Luna, Mahyar Kargar, Carl Grace, Sumant Ramprasad
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Publication number: 20110211846Abstract: Frequency peaking is used in the transmitter to improve link performance. In one example, frequency peaking improves the PIED or TWDP. The frequency peaking can result in pulse shapes that have more electrical energy in the receiver (and therefore higher received SNR) than uncompensated pulses. In addition, due to the response of typical fibers, boosting the high frequencies typically will flatten the received spectrum, which will improve the performance of the equalizer in an EDC receiver.Type: ApplicationFiled: December 13, 2010Publication date: September 1, 2011Applicant: CLARIPHY COMMUNICATIONS, INC.Inventors: Thomas A. Lindsay, Norman L. Swenson
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Patent number: 8009981Abstract: A transmitter for a communications link is tested by using a (software) simulation of a reference channel and/or a reference receiver to test the transmitter. In one embodiment for optical fiber communications links, a data test pattern is applied to the transmitter under test and the resulting optical output is captured, for example by a sampling oscilloscope. The captured waveform is subsequently processed by the software simulation, in order to simulate propagation of the optical signal through the reference channel and/or reference receiver. A performance metric for the transmitter is calculated based on the processed waveform.Type: GrantFiled: January 4, 2010Date of Patent: August 30, 2011Assignee: ClariPhy Communications, Inc.Inventors: Norman L. Swenson, Paul Voois, Thomas A. Lindsay, Steve C. Zeng
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Publication number: 20110081152Abstract: A receiver (e.g., for a 10G fiber communications link) includes an interleaved ADC coupled to a multi-channel equalizer that can provide different equalization for different ADC channels within the interleaved ADC. That is, the multi-channel equalizer can compensate for channel-dependent impairments. In one approach, the multi-channel equalizer is a feedforward equalizer (FFE) coupled to a Viterbi decoder, for example a sliding block Viterbi decoder (SBVD); and the FFE and/or the channel estimator for the Viterbi decoder are adapted using the LMS algorithm.Type: ApplicationFiled: December 13, 2010Publication date: April 7, 2011Applicant: CLARIPHY COMMUNICATIONS, INC.Inventors: Oscar E. Agazzi, Diego E. Crivelli, Hugo S. Carrer, Mario R. Hueda, German C. Luna, Carl Grace
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Publication number: 20110058596Abstract: A system includes a time-interleaved device. An equalizer effectively can apply different equalization to different interleaved channels. For convenience, these equalizers will be referred to as multi-channel equalizers. In one aspect, an apparatus includes an interleaved device having M interleaved channels, and a multi-channel equalizer coupled to the interleaved device. The multi-channel equalizer is capable of applying a different equalization to different interleaved channels, thus compensating for channel-dependent impairments.Type: ApplicationFiled: July 19, 2010Publication date: March 10, 2011Applicant: ClariPhy Communications, Inc.Inventors: Oscar E. Agazzi, Diego E. Crivelli, Hugo S. Carrer, Mario R. Hueda, German C. Luna
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Patent number: 7853149Abstract: Frequency peaking is used in the transmitter to improve link performance. In one example, frequency peaking improves the PIED or TWDP. The frequency peaking can result in pulse shapes that have more electrical energy in the receiver (and therefore higher received SNR) than uncompensated pulses. In addition, due to the response of typical fibers, boosting the high frequencies typically will flatten the received spectrum, which will improve the performance of the equalizer in an EDC receiver.Type: GrantFiled: March 7, 2006Date of Patent: December 14, 2010Assignee: ClariPhy Communications, Inc.Inventors: Thomas A. Lindsay, Norman L. Swenson
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Patent number: 7852913Abstract: A receiver (e.g., for a 10 G fiber communications link) includes an interleaved ADC coupled to a multi-channel equalizer that can provide different equalization for different ADC channels within the interleaved ADC. That is, the multi-channel equalizer can compensate for channel-dependent impairments. In one approach, the multi-channel equalizer is a feedforward equalizer (FFE) coupled to a Viterbi decoder, for example a sliding block Viterbi decoder (SBVD); and the FFE and/or the channel estimator for the Viterbi decoder are adapted using the LMS algorithm.Type: GrantFiled: November 14, 2006Date of Patent: December 14, 2010Assignee: Clariphy Communications, Inc.Inventors: Oscar E. Agazzi, Diego E. Crivelli, Hugo S. Carrer, Mario R. Hueda, German C. Luna, Carl Grace
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Patent number: 7808417Abstract: A lookahead pipelined ADC architecture uses open-loop residue amplifiers with calibration. This approach is able to achieve a high-speed, high-accuracy ADC with reduced power consumption. In one aspect, an ADC pipeline unit includes a plurality of lookahead pipeline stages (i.e., an ADC lookahead pipeline) coupled to a calibration unit. The ADC lookahead pipeline uses open-loop residue amplifiers. The calibration unit compensates for non-linearity in the open-loop amplifiers.Type: GrantFiled: September 15, 2008Date of Patent: October 5, 2010Assignee: ClariPhy Communications, Inc.Inventor: Ali Nazemi
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Patent number: 7778320Abstract: A system includes a time-interleaved device. An equalizer effectively can apply different equalization to different interleaved channels. For convenience, these equalizers will be referred to as multi-channel equalizers. In one aspect, an apparatus includes an interleaved device having M interleaved channels, and a multi-channel equalizer coupled to the interleaved device. The multi-channel equalizer is capable of applying a different equalization to different interleaved channels, thus compensating for channel-dependent impairments.Type: GrantFiled: October 2, 2006Date of Patent: August 17, 2010Assignee: ClariPhy Communications, Inc.Inventors: Oscar Ernesto Agazzi, Diego Ernesto Crivelli, Hugo Santiago Carrer, Mario Rafael Hueda, German Cesar Augusto Luna
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Publication number: 20100142603Abstract: A receiver for a communications link includes a receiver module and a host receiver. These two components can be tested independently. In one embodiment, the receiver module is characterized with respect to noise and distortion. The noise performance can be determined by comparing input and output signals of the receiver module, to determine the relative noise of the receiver module. The distortion performance can be determined by comparing the distortion of input and output signals of the receiver module, using a reference host receiver that includes an equalizer. The host receiver can be tested by using a reference receiver module.Type: ApplicationFiled: February 15, 2010Publication date: June 10, 2010Applicant: CLARIPHY COMMUNICATIONS, INCInventors: Thomas A. Linsday, Norman L. Swenson, Paul Voois
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Publication number: 20100103839Abstract: A transmitter for a communications link is tested by using a (software) simulation of a reference channel and/or a reference receiver to test the transmitter. In one embodiment for optical fiber communications links, a data test pattern is applied to the transmitter under test and the resulting optical output is captured, for example by a sampling oscilloscope. The captured waveform is subsequently processed by the software simulation, in order to simulate propagation of the optical signal through the reference channel and/or reference receiver. A performance metric for the transmitter is calculated based on the processed waveform.Type: ApplicationFiled: January 4, 2010Publication date: April 29, 2010Applicant: CLARIPHY COMMUNICATIONS, INC.Inventors: Norman L. Swenson, Paul Voois, Thomas A. Lindsay, Steve C. Zeng
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Patent number: 7664394Abstract: A receiver for a communications link includes a receiver module and a host receiver. These two components can be tested independently. In one embodiment, the receiver module is characterized with respect to noise and distortion. The noise performance can be determined by comparing input and output signals of the receiver module, to determine the relative noise of the receiver module. The distortion performance can be determined by comparing the distortion of input and output signals of the receiver module, using a reference host receiver that includes an equalizer. The host receiver can be tested by using a reference receiver module.Type: GrantFiled: June 29, 2006Date of Patent: February 16, 2010Assignee: ClariPhy Communications, Inc.Inventors: Thomas A. Lindsay, Norman L. Swenson, Paul Voois
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Patent number: 7643752Abstract: A transmitter for a communications link is tested by using a (software) simulation of a reference channel and/or a reference receiver to test the transmitter. In one embodiment for optical fiber communications links, a data test pattern is applied to the transmitter under test and the resulting optical output is captured, for example by a sampling oscilloscope. The captured waveform is subsequently processed by the software simulation, in order to simulate propagation of the optical signal through the reference channel and/or reference receiver. A performance metric for the transmitter is calculated based on the processed waveform.Type: GrantFiled: December 21, 2005Date of Patent: January 5, 2010Assignee: ClariPhy Communications, Inc.Inventors: Norman L Swenson, Paul Voois, Thomas A. Lindsay, Steve C. Zeng
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Patent number: 7576676Abstract: A lookahead pipelined ADC architecture uses open-loop residue amplifiers with calibration. This approach is able to achieve a high-speed, high-accuracy ADC with reduced power consumption. In one aspect, an ADC pipeline unit includes a plurality of lookahead pipeline stages (i.e., an ADC lookahead pipeline) coupled to a calibration unit. The ADC lookahead pipeline uses open-loop residue amplifiers. The calibration unit compensates for non-linearity in the open-loop amplifiers.Type: GrantFiled: October 20, 2006Date of Patent: August 18, 2009Assignee: ClariPhy Communications, Inc.Inventor: Carl Grace
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Publication number: 20090060018Abstract: An equalizer at the transmitter reduces data-dependent jitter introduced by a non-linear device in the transmitter. In one implementation, the equalizer is T/2-spaced. In an alternate implementation, it is T-spaced.Type: ApplicationFiled: March 26, 2008Publication date: March 5, 2009Applicant: ClariPhy Communications, Inc.Inventors: Oscar E. Agazzi, Hugo S. Carrer
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Publication number: 20080240325Abstract: A receiver (e.g., for a 10 G fiber communications link) includes an interleaved ADC coupled to a multi-channel equalizer that can provide different equalization for different ADC channels within the interleaved ADC. That is, the multi-channel equalizer can compensate for channel-dependent impairments. In one approach, the multi-channel equalizer is a feedforward equalizer (FFE) coupled to a Viterbi decoder, for example a sliding block Viterbi decoder (SBVD); and the FFE and/or the channel estimator for the Viterbi decoder are adapted using the LMS algorithm.Type: ApplicationFiled: March 26, 2008Publication date: October 2, 2008Applicant: ClariPhy Communications, Inc.Inventors: Oscar E. Agazzi, Diego E. Crivelli, Hugo S. Carrer, Mario R. Hueda, German C. Luna, Carl Grace
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Publication number: 20070176814Abstract: A lookahead pipelined ADC architecture uses open-loop residue amplifiers with calibration. This approach is able to achieve a high-speed, high-accuracy ADC with reduced power consumption. In one aspect, an ADC pipeline unit includes a plurality of lookahead pipeline stages (i.e., an ADC lookahead pipeline) coupled to a calibration unit. The ADC lookahead pipeline uses open-loop residue amplifiers. The calibration unit compensates for non-linearity in the open-loop amplifiers.Type: ApplicationFiled: October 20, 2006Publication date: August 2, 2007Applicant: CLARIPHY COMMUNICATIONS, INC.Inventor: Carl Grace
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Publication number: 20070133719Abstract: A receiver (e.g., for a 10 G fiber communications link) includes an interleaved ADC coupled to a multi-channel equalizer that can provide different equalization for different ADC channels within the interleaved ADC. That is, the multi-channel equalizer can compensate for channel-dependent impairments. In one approach, the multi-channel equalizer is a feedforward equalizer (FFE) coupled to a Viterbi decoder, for example a sliding block Viterbi decoder (SBVD); and the FFE and/or the channel estimator for the Viterbi decoder are adapted using the LMS algorithm.Type: ApplicationFiled: November 14, 2006Publication date: June 14, 2007Applicant: ClariPhy Communications, Inc.Inventors: OSCAR AGAZZI, DIEGO CRIVELLI, HUGO CARRER, MARIO HUEDA, GERMAN LUNA, CARL GRACE