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: 7599422Abstract: A communication system utilizing an adjustable link has at least a first data transmission circuit including at least a first communication link circuit. The first communication link circuit has a baseband circuit and at least a passband circuit. The baseband circuit corresponds to a baseband sub-channel and the passband circuit corresponds to a passband sub-channel. The first communication link circuit also includes a circuit that distributes a first subset of a data stream having a first symbol rate to the baseband circuit and a second subset of the data stream having a second symbol rate to the passband circuit. The baseband sub-channel and the passband sub-channel are separated by an adjacent guardband of frequencies. The passband carrier frequency is adjusted to define the guardband and the guardband corresponds to a first notch in a channel response of a first communications channel.Type: GrantFiled: November 11, 2008Date of Patent: October 6, 2009Assignee: Rambus Inc.Inventors: Vladimir M. Stojanovic, Amir Amirkhany, Jared L. Zerbe
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Publication number: 20090175326Abstract: A receive circuit for receiving a signal transmitted via an electric signal conductor. A first sampling circuit generates a first sample value that indicates whether the signal exceeds a first threshold level, and a second sampling circuit generates a second sample value that indicates whether the signal exceeds a second threshold level. A first select circuit receives the first and second sample values from the first and second sampling circuits and selects, according to a previously generated sample value, either the first sample value or the second sample value to be output as a selected sample value.Type: ApplicationFiled: March 12, 2009Publication date: July 9, 2009Inventors: 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: 7508871Abstract: 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: October 12, 2007Date of Patent: March 24, 2009Assignee: Rambus Inc.Inventors: Jared L Zerbe, Vladimir M Stojanovic, Fred F Chen
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Publication number: 20090066376Abstract: 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: ApplicationFiled: November 13, 2008Publication date: March 12, 2009Applicant: RAMBUS INC.Inventors: Fred F. Chen, Vladimir M. Stojanovic
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Publication number: 20090067537Abstract: A communication system utilizing an adjustable link has at least a first data transmission circuit including at least a first communication link circuit. The first communication link circuit has a baseband circuit and at least a passband circuit. The baseband circuit corresponds to a baseband sub-channel and the passband circuit corresponds to a passband sub-channel. The first communication link circuit also includes a circuit that distributes a first subset of a data stream having a first symbol rate to the baseband circuit and a second subset of the data stream having a second symbol rate to the passband circuit. The baseband sub-channel and the passband sub-channel are separated by an adjacent guardband of frequencies. The passband carrier frequency is adjusted to define the guardband and the guardband corresponds to a first notch in a channel response of a first communications channel.Type: ApplicationFiled: November 11, 2008Publication date: March 12, 2009Inventors: Vladimir M. Stojanovic, Amir Amirkhany, Jared L. Zerbe
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Publication number: 20090067484Abstract: 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: November 12, 2008Publication date: March 12, 2009Applicant: RAMBUS INC.Inventors: Jared L. Zerbe, Vladimir M. Stojanovic, Fred F. Chen
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Publication number: 20090067482Abstract: 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: November 12, 2008Publication date: March 12, 2009Applicant: Rambus Inc.Inventors: Jared L. Zerbe, Vladimir M. Stojanovic, Fred F. Chen
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Publication number: 20090060017Abstract: 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: November 12, 2008Publication date: March 5, 2009Applicant: RAMBUS INC.Inventors: Jared L. Zerbe, Vladimir M. Stojanovic, Fred F. Chen
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Publication number: 20090002030Abstract: 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: September 8, 2008Publication date: January 1, 2009Inventors: Vladimir M. Stojanovic, Andrew C.C. Ho, Anthony Bessios, Fred F. Chen, Elad Alon, Mark A. Horowitz
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Patent number: 7450629Abstract: A communication system utilizing an adjustable link has at least a first data transmission circuit including at least a first communication link circuit. The first communication link circuit has a baseband circuit and at least a passband circuit. The baseband circuit corresponds to a baseband sub-channel and the passband circuit corresponds to a passband sub-channel. The first communication link circuit also includes a circuit that distributes a first subset of a data stream having a first symbol rate to the baseband circuit and a second subset of the data stream having a second symbol rate to the passband circuit. The baseband sub-channel and the passband sub-channel are separated by an adjacent guardband of frequencies. The passband carrier frequency is adjusted to define the guardband and the guardband corresponds to a first notch in a channel response of a first communications channel.Type: GrantFiled: February 13, 2008Date of Patent: November 11, 2008Assignee: Rambus, Inc.Inventors: Vladimir M. Stojanovic, Amir Amirkhany, Jared L. Zerbe
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Patent number: 7433397Abstract: In a receive circuit within an integrated circuit device, a binary input signal is sampled in response to transitions of a sampling clock signal to generate a set of data samples. The binary input signal is additionally compared with first and second threshold levels to generate respective first and second edge samples. The phase of the sampling clock signal is adjusted based, at least in part, on the first edge sample if the set of data samples matches a first data pattern and based, at least in part, on the second edge sample if the set of data samples matches a second data pattern.Type: GrantFiled: April 14, 2006Date of Patent: October 7, 2008Assignee: Rambus Inc.Inventors: Bruno W. Garlepp, Jared L. Zerbe, Metha Jeeradit, Vladimir M. Stojanovic
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Publication number: 20080224739Abstract: 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: ApplicationFiled: March 19, 2008Publication date: September 18, 2008Applicant: RAMBUS INC.Inventors: Fred F. Chen, Vladimir M Stojanovic
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Patent number: 7423454Abstract: 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: October 3, 2006Date of Patent: September 9, 2008Assignee: 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: 7412016Abstract: A circuit for adjusting the phase of a clock signal. A first sampling circuit generates a sequence of data samples in response to transitions of the clock signal, each of the data samples having either a first state or a second state according to whether an incoming signal exceeds a first threshold. An second sampling circuit generates an error sample in response to one of the transitions of the clock signal, the error sample having either the first state or the second state according to whether the incoming signal exceeds a second threshold. A phase adjust circuit adjusts the phase of the clock signal if the sequence of data samples matches a predetermined pattern and based, at least in part, on whether the error sample has the first state or the second state.Type: GrantFiled: July 5, 2006Date of Patent: August 12, 2008Assignee: Rambus Inc.Inventor: Vladimir M. Stojanovic
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Patent number: 7397848Abstract: A receive circuit for receiving a signal transmitted via an electric signal conductor. A first sampling circuit generates a first sample value that indicates whether the signal exceeds a first threshold level, and a second sampling circuit generates a second sample value that indicates whether the signal exceeds a second threshold level. A first select circuit receives the first and second sample values from the first and second sampling circuits and selects, according to a previously generated sample value, either the first sample value or the second sample value to be output as a selected sample value.Type: GrantFiled: September 16, 2003Date of Patent: July 8, 2008Assignee: 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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Publication number: 20080137783Abstract: A communication system utilizing an adjustable link has at least a first data transmission circuit including at least a first communication link circuit. The first communication link circuit has a baseband circuit and at least a passband circuit. The baseband circuit corresponds to a baseband sub-channel and the passband circuit corresponds to a passband sub-channel. The first communication link circuit also includes a circuit that distributes a first subset of a data stream having a first symbol rate to the baseband circuit and a second subset of the data stream having a second symbol rate to the passband circuit. The baseband sub-channel and the passband sub-channel are separated by an adjacent guardband of frequencies. The passband carrier frequency is adjusted to define the guardband and the guardband corresponds to a first notch in a channel response of a first communications channel.Type: ApplicationFiled: February 13, 2008Publication date: June 12, 2008Inventors: Vladimir M. Stojanovic, Amir Amirkhany, Jared L. Zerbe
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Patent number: 7362800Abstract: An signal communication device having an auto-configured equalizer. The signal communication device includes a scoping circuit, buffer circuit, select circuit and equalizing circuit. A test signal is transmitted to the signal communication device via a signal path. The scoping circuit generates a waveform trace of the test signal, the waveform trace indicating time interval between receipt of a transition in the test signal and receipt of a reflection of the transition. The buffer circuit stores a plurality of data values that correspond to data signals received via the signal path. The select circuit selects one of the plurality of data values from the buffer circuit based on the time interval indicated by the waveform trace. The equalizing circuit generates an equalizing signal based on the selected data value.Type: GrantFiled: July 12, 2002Date of Patent: April 22, 2008Assignee: Rambus Inc.Inventors: Jared L. Zerbe, Vladimir M. Stojanovic, Fred F. Chen
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Patent number: 7349484Abstract: A communication system utilizing an adjustable link has at least a first data transmission circuit including at least a first communication link circuit. The first communication link circuit has a baseband circuit and at least a passband circuit. The baseband circuit corresponds to a baseband sub-channel and the passband circuit corresponds to a passband sub-channel. The first communication link circuit also includes a circuit that distributes a first subset of a data stream having a first symbol rate to the baseband circuit and a second subset of the data stream having a second symbol rate to the passband circuit. The baseband sub-channel and the passband sub-channel are separated by an adjacent guardband of frequencies. The passband carrier frequency is adjusted to define the guardband and the guardband corresponds to a first notch in a channel response of a first communications channel.Type: GrantFiled: December 22, 2004Date of Patent: March 25, 2008Assignee: Rambus Inc.Inventors: Vladimir M. Stojanovic, Amir Amirkhany, Jared L. Zerbe
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Patent number: 7348811Abstract: 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: October 14, 2005Date of Patent: March 25, 2008Assignee: Rambus Inc.Inventors: Fred F. Chen, Vladimir M. Stojanovic
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Patent number: 7292629Abstract: 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: July 12, 2002Date of Patent: November 6, 2007Assignee: Rambus Inc.Inventors: Jared L. Zerbe, Vladimir M. Stojanovic, Fred F. Chen