Patents by Inventor Vladimir M. Stojanovic
Vladimir M. Stojanovic has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9025678Abstract: A signaling system is described. The signaling system comprises a transmit device, a receive device including a partial response receive circuit, and a signaling path coupling the transmit device and the receive device. The receive device observes an equalized signal from the signaling path, and includes circuitry to use feedback from the most recent previously resolved symbol to sample a currently incoming symbol. The transmit device equalizes transmit data to transmit the equalized signal, by applying weighting based on one or more data values not associated with the most recent previously resolved symbol value.Type: GrantFiled: April 30, 2012Date of Patent: May 5, 2015Assignee: Rambus Inc.Inventors: Vladimir M. Stojanovic, Mark A. Horowitz, Jared L. Zerbe, Anthony Bessios, Andrew C. C. Ho, Jason C. Wei, Grace Tsang, Bruno W. Garlepp
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Patent number: 9000803Abstract: A high-speed signaling system with adaptive transmit pre-emphasis. A transmit circuit has a plurality of output drivers to output a first signal onto a signal path. A receive circuit is coupled to receive the first signal via the signal path and configured to generate an indication of whether the first signal exceeds a threshold level. A first threshold control circuit is coupled to receive the indication from the receive circuit and configured to adjust the threshold level according to whether the first signal exceeds the threshold level. A drive strength control circuit is coupled to receive the indication from the receive circuit and configured to adjust a drive strength of at least one output driver of the plurality of output drivers according to whether the first signal exceeds the threshold level.Type: GrantFiled: June 7, 2013Date of Patent: April 7, 2015Assignee: Rambus Inc.Inventors: Vladimir M. Stojanovic, Andrew C. Ho, Anthony Bessios, Fred F. Chen, Elad Alon, Mark A. Horowitz
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Patent number: 8994398Abstract: A high-speed signaling system with adaptive transmit pre-emphasis. A transmit circuit has a plurality of output drivers to output a first signal onto a signal path. A receive circuit is coupled to receive the first signal via the signal path and configured to generate an indication of whether the first signal exceeds a threshold level. A first threshold control circuit is coupled to receive the indication from the receive circuit and configured to adjust the threshold level according to whether the first signal exceeds the threshold level. A drive strength control circuit is coupled to receive the indication from the receive circuit and configured to adjust a drive strength of at least one output driver of the plurality of output drivers according to whether the first signal exceeds the threshold level.Type: GrantFiled: June 7, 2013Date of Patent: March 31, 2015Assignee: Rambus Inc.Inventors: Vladimir M. Stojanovic, Andrew C. Ho, Anthony Bessios, Fred F. Chen, Elad Alon, Mark A. Horowitz
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Patent number: 8861667Abstract: A signal receiving circuit having an equalizer calibration function. The signal receiving circuit includes a sampling circuit, output driver and clock signal generator. The sampling circuit captures samples of a data signal in response to a sampling clock signal. The output driver outputs an equalizing signal to an input of the sampling circuit in response to a first clock signal. The clock signal generator adjusts a phase of the first clock signal to achieve phase alignment between transitions of the equalizing signal and transitions of the data signal.Type: GrantFiled: July 12, 2002Date of Patent: October 14, 2014Assignee: Rambus Inc.Inventors: Jared L. Zerbe, Vladimir M. Stojanovic, Fred F. Chen
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Publication number: 20140286383Abstract: A signaling circuit having a selectable-tap equalizer. The signaling circuit includes a buffer, a select circuit and an equalizing circuit. The buffer is used to store a plurality of data values that correspond to data signals transmitted on a signaling path during a first time interval. The select circuit is coupled to the buffer to select a subset of data values from the plurality of data values according to a select value. The equalizing circuit is coupled to receive the subset of data values from the select circuit and is adapted to adjust, according to the subset of data values, a signal level that corresponds to a data signal transmitted on the signaling path during a second time interval.Type: ApplicationFiled: January 1, 2014Publication date: September 25, 2014Applicant: Rambus Inc.Inventors: Jared L. Zerbe, Vladimir M. Stojanovic, Fred F. Chen
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Patent number: 8654829Abstract: A signaling circuit having a selectable-tap equalizer. The signaling circuit includes a buffer, a select circuit and an equalizing circuit. The buffer is used to store a plurality of data values that correspond to data signals transmitted on a signaling path during a first time interval. The select circuit is coupled to the buffer to select a subset of data values from the plurality of data values according to a select value. The equalizing circuit is coupled to receive the subset of data values from the select circuit and is adapted to adjust, according to the subset of data values, a signal level that corresponds to a data signal transmitted on the signaling path during a second time interval.Type: GrantFiled: December 28, 2012Date of Patent: February 18, 2014Assignee: Rambus Inc.Inventors: Jared L. Zerbe, Vladimir M. Stojanovic, Fred F. Chen
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Patent number: 8564328Abstract: A high-speed signaling system with adaptive transmit pre-emphasis. A transmit circuit has a plurality of output drivers to output a first signal onto a signal path. A receive circuit is coupled to receive the first signal via the signal path and configured to generate an indication of whether the first signal exceeds a threshold level. A first threshold control circuit is coupled to receive the indication from the receive circuit and configured to adjust the threshold level according to whether the first signal exceeds the threshold level. A drive strength control circuit is coupled to receive the indication from the receive circuit and configured to adjust a drive strength of at least one output driver of the plurality of output drivers according to whether the first signal exceeds the threshold level.Type: GrantFiled: May 21, 2012Date of Patent: October 22, 2013Assignee: Rambus Inc.Inventors: Vladimir M. Stojanovic, Andrew C. C. Ho, Anthony Bessios, Fred F. Chen, Elad Alon, Mark A. Horowitz
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Publication number: 20130272446Abstract: A high-speed signaling system with adaptive transmit pre-emphasis. A transmit circuit has a plurality of output drivers to output a first signal onto a signal path. A receive circuit is coupled to receive the first signal via the signal path and configured to generate an indication of whether the first signal exceeds a threshold level. A first threshold control circuit is coupled to receive the indication from the receive circuit and configured to adjust the threshold level according to whether the first signal exceeds the threshold level. A drive strength control circuit is coupled to receive the indication from the receive circuit and configured to adjust a drive strength of at least one output driver of the plurality of output drivers according to whether the first signal exceeds the threshold level.Type: ApplicationFiled: June 7, 2013Publication date: October 17, 2013Inventors: Vladimir M. Stojanovic, Andrew C. Ho, Anthony Bessios, Fred F. Chen, Elad Alon, Mark A. Horowitz
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Publication number: 20130272359Abstract: A high-speed signaling system with adaptive transmit pre-emphasis. A transmit circuit has a plurality of output drivers to output a first signal onto a signal path. A receive circuit is coupled to receive the first signal via the signal path and configured to generate an indication of whether the first signal exceeds a threshold level. A first threshold control circuit is coupled to receive the indication from the receive circuit and configured to adjust the threshold level according to whether the first signal exceeds the threshold level. A drive strength control circuit is coupled to receive the indication from the receive circuit and configured to adjust a drive strength of at least one output driver of the plurality of output drivers according to whether the first signal exceeds the threshold level.Type: ApplicationFiled: June 7, 2013Publication date: October 17, 2013Inventors: Vladimir M. Stojanovic, Andrew C. Ho, Anthony Bessios, Fred F. Chen, Elad Alon, Mark A. Horowitz
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Patent number: 8472511Abstract: A signaling circuit having a selectable-tap equalizer. The signaling circuit includes a buffer, a select circuit and an equalizing circuit. The buffer is used to store a plurality of data values that correspond to data signals transmitted on a signaling path during a first time interval. The select circuit is coupled to the buffer to select a subset of data values from the plurality of data values according to a select value. The equalizing circuit is coupled to receive the subset of data values from the select circuit and is adapted to adjust, according to the subset of data values, a signal level that corresponds to a data signal transmitted on the signaling path during a second time interval.Type: GrantFiled: December 13, 2011Date of Patent: June 25, 2013Assignee: Rambus Inc.Inventors: Jared L. Zerbe, Vladimir M. Stojanovic, Fred F. Chen
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Patent number: 8467437Abstract: A signaling circuit having a selectable-tap equalizer. The signaling circuit includes a buffer, a select circuit and an equalizing circuit. The buffer is used to store a plurality of data values that correspond to data signals transmitted on a signaling path during a first time interval. The select circuit is coupled to the buffer to select a subset of data values from the plurality of data values according to a select value. The equalizing circuit is coupled to receive the subset of data values from the select circuit and is adapted to adjust, according to the subset of data values, a signal level that corresponds to a data signal transmitted on the signaling path during a second time interval.Type: GrantFiled: November 12, 2008Date of Patent: June 18, 2013Assignee: Rambus Inc.Inventors: Jared L Zerbe, Vladimir M Stojanovic, Fred F Chen
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Publication number: 20130128944Abstract: A signaling circuit having a selectable-tap equalizer. The signaling circuit includes a buffer, a select circuit and an equalizing circuit. The buffer is used to store a plurality of data values that correspond to data signals transmitted on a signaling path during a first time interval. The select circuit is coupled to the buffer to select a subset of data values from the plurality of data values according to a select value. The equalizing circuit is coupled to receive the subset of data values from the select circuit and is adapted to adjust, according to the subset of data values, a signal level that corresponds to a data signal transmitted on the signaling path during a second time interval.Type: ApplicationFiled: December 28, 2012Publication date: May 23, 2013Inventors: Jared L. Zerbe, Vladimir M. Stojanovic, Fred F. Chen
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Patent number: 8428196Abstract: A signaling system is described. The signaling system comprises a transmit device, a receive device including a partial response receive circuit, and a signaling path coupling the transmit device and the receive device. The receive device observes an equalized signal from the signaling path, and includes circuitry to use feedback from the most recent previously resolved symbol to sample a currently incoming symbol. The transmit device equalizes transmit data to transmit the equalized signal, by applying weighting based on one or more data values not associated with the most recent previously resolved symbol value.Type: GrantFiled: May 11, 2012Date of Patent: April 23, 2013Assignee: Rambus Inc.Inventors: Vladimir M. Stojanovic, Mark A. Horowitz, Jared L. Zerbe, Anthony Bessios, Andrew C. C. Ho, Jason C. Wei, Grace Tsang, Bruno W. Garlepp
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Patent number: 8330503Abstract: A signaling circuit having reduced parasitic capacitance. The signaling circuit includes a plurality of driver circuits each having an output coupled to a first output node, and a plurality of select circuits each having an output coupled to a control input of a corresponding one of the driver circuits. Each of the select circuits includes a control input to receive a respective select signal and a plurality of data inputs to receive a plurality of data signals. Each of the select circuits is adapted to select, according to the respective select signal, one of the plurality of data signals to be output to the control input of the corresponding one of the driver circuits.Type: GrantFiled: March 19, 2008Date of Patent: December 11, 2012Assignee: Rambus Inc.Inventors: Fred F Chen, Vladimir M Stojanovic
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Publication number: 20120288027Abstract: A high-speed signaling system with adaptive transmit pre-emphasis. A transmit circuit has a plurality of output drivers to output a first signal onto a signal path. A receive circuit is coupled to receive the first signal via the signal path and configured to generate an indication of whether the first signal exceeds a threshold level. A first threshold control circuit is coupled to receive the indication from the receive circuit and configured to adjust the threshold level according to whether the first signal exceeds the threshold level. A drive strength control circuit is coupled to receive the indication from the receive circuit and configured to adjust a drive strength of at least one output driver of the plurality of output drivers according to whether the first signal exceeds the threshold level.Type: ApplicationFiled: May 21, 2012Publication date: November 15, 2012Inventors: Vladimir M. Stojanovic, Andrew C. C. Ho, Anthony Bessios, Fred F. Chen, Elad Alon, Mark A. Horowitz
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Patent number: 8311145Abstract: A method of reducing bit-error rate is described. The method includes transmitting a data stream of data words at a line rate that is adjustable and equal to a positive delta value added to an established data rate. The method includes accumulating available time slots in the transmitted data stream, and selectively retransmitting a subset of the data words such that the retransmitted data words occupy no more than the accumulated available time slots.Type: GrantFiled: May 7, 2009Date of Patent: November 13, 2012Assignee: Rambus Inc.Inventors: Jared L. Zerbe, Vladimir M. Stojanovic
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Publication number: 20120224621Abstract: A signaling system is described. The signaling system comprises a transmit device, a receive device including a partial response receive circuit, and a signaling path coupling the transmit device and the receive device. The receive device observes an equalized signal from the signaling path, and includes circuitry to use feedback from the most recent previously resolved symbol to sample a currently incoming symbol. The transmit device equalizes transmit data to transmit the equalized signal, by applying weighting based on one or more data values not associated with the most recent previously resolved symbol value.Type: ApplicationFiled: May 11, 2012Publication date: September 6, 2012Inventors: Vladimir M. Stojanovic, Mark A. Horowitz, Jared L. Zerbe, Anthony Bessios, Andrew C.C. Ho, Jason C. Wei, Grace Tsang, Bruno W. Garlepp
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Publication number: 20120213267Abstract: A signaling system is described. The signaling system comprises a transmit device, a receive device including a partial response receive circuit, and a signaling path coupling the transmit device and the receive device. The receive device observes an equalized signal from the signaling path, and includes circuitry to use feedback from the most recent previously resolved symbol to sample a currently incoming symbol. The transmit device equalizes transmit data to transmit the equalized signal, by applying weighting based on one or more data values not associated with the most recent previously resolved symbol value.Type: ApplicationFiled: April 30, 2012Publication date: August 23, 2012Inventors: Vladimir M. Stojanovic, Mark A. Horowitz, Jared L. Zerbe, Anthony Bessios, Andrew C.C. Ho, Jason C. Wei, Grace Tsang, Bruno W. Garlepp
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Patent number: 8183887Abstract: A high-speed signaling system with adaptive transmit pre-emphasis. A transmit circuit has a plurality of output drivers to output a first signal onto a signal path. A receive circuit is coupled to receive the first signal via the signal path and configured to generate an indication of whether the first signal exceeds a threshold level. A first threshold control circuit is coupled to receive the indication from the receive circuit and configured to adjust the threshold level according to whether the first signal exceeds the threshold level. A drive strength control circuit is coupled to receive the indication from the receive circuit and configured to adjust a drive strength of at least one output driver of the plurality of output drivers according to whether the first signal exceeds the threshold level.Type: GrantFiled: January 25, 2010Date of Patent: May 22, 2012Assignee: Rambus Inc.Inventors: Vladimir M. Stojanovic, Andrew C. C. Ho, Anthony Bessios, Fred F. Chen, Elad Alon, Mark A. Horowitz
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Patent number: 8170163Abstract: A signaling system is described. The signaling system comprises a transmit device, a receive device including a partial response receive circuit, and a signaling path coupling the transmit device and the receive device. The receive device observes an equalized signal from the signaling path, and includes circuitry to use feedback from the most recent previously resolved symbol to sample a currently incoming symbol. The transmit device equalizes transmit data to transmit the equalized signal, by applying weighting based on one or more data values not associated with the most recent previously resolved symbol value.Type: GrantFiled: February 23, 2010Date of Patent: May 1, 2012Assignee: Rambus Inc.Inventors: Vladimir M. Stojanovic, Mark A. Horowitz, Jared L. Zerbe, Anthony Bessios, Andrew C. C. Ho, Jason C. Wei, Grace Tsang, Bruno W. Garlepp