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公开(公告)号：US20170149513A1
公开(公告)日：2017-05-25
申请号：US15368805
申请日：2016-12-05
Applicant: Rambus Inc.
Inventor： Andrew Ho , Vladimir Stojanovic , Bruno W. Garlepp , Fred F. Chen
CPC classification number: H04B17/29 , G01R31/31711 , G06F11/08 , H04B17/21 , H04L1/20 , H04L1/241 , H04L1/242 , H04L7/033 , H04L7/043 , H04L7/10 , H04L25/03006 , H04L25/03057 , H04L25/03146 , H04L25/03949 , H04L27/01
Abstract: Described are methods and circuits for margin testing digital receivers. These methods and circuits prevent margins from collapsing in response to erroneously received data, and can thus be used in receivers that employ historical data to reduce intersymbol interference (ISI). Some embodiments detect receive errors for input data streams of unknown patterns, and can thus be used for in-system margin testing. Such systems can be adapted to dynamically alter system parameters during device operation to maintain adequate margins despite fluctuations in the system noise environment due to e.g. temperature and supply-voltage changes. Also described are methods of plotting and interpreting filtered and unfiltered error data generated by the disclosed methods and circuits. Some embodiments filter error data to facilitate pattern-specific margin testing.
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公开(公告)号：US09660840B1
公开(公告)日：2017-05-23
申请号：US15209454
申请日：2016-07-13
Applicant: Rambus Inc.
Inventor： Jared L. Zerbe , Vladimir M. Stojanovic , Fred F. Chen
IPC: H04L25/03
CPC classification number: H04L25/03019 , H04B1/1081 , H04L7/0058 , H04L7/0087 , H04L7/0331 , H04L25/03025 , H04L25/03038 , H04L25/03057 , H04L25/03343 , H04L25/03885
Abstract: 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.
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公开(公告)号：US20140286383A1
公开(公告)日：2014-09-25
申请号：US14145960
申请日：2014-01-01
Applicant: Rambus Inc.
Inventor： Jared L. Zerbe , Vladimir M. Stojanovic , Fred F. Chen
CPC classification number: H04L25/03019 , H04B1/1081 , H04L7/0058 , H04L7/0087 , H04L7/0331 , H04L25/03025 , H04L25/03038 , H04L25/03057 , H04L25/03343 , H04L25/03885
Abstract: 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.
Abstract translation: 一种具有可选择抽头均衡器的信令电路。 信令电路包括缓冲器，选择电路和均衡电路。 缓冲器用于存储对应于在第一时间间隔期间在信令路径上发送的数据信号的多个数据值。 选择电路耦合到缓冲器，以根据选择值从多个数据值中选择数据值的子集。 均衡电路被耦合以从选择电路接收数据值的子集，并且适于根据数据值的子集来调整对应于在第二时间间隔期间在信令路径上发送的数据信号的信号电平。
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公开(公告)号：US20130272446A1
公开(公告)日：2013-10-17
申请号：US13913156
申请日：2013-06-07
Applicant: Rambus Inc.
Inventor： Vladimir M. Stojanovic , Andrew C. Ho , Anthony Bessios , Fred F. Chen , Elad Alon , Mark A. Horowitz
IPC: H04B1/04
CPC classification number: H04L25/49 , H04B1/04 , H04B1/0475 , H04B2001/0416 , H04L25/025 , H04L25/028 , H04L25/0282 , H04L25/03019 , H04L25/03343 , H04L25/03885 , H04L25/061 , H04L25/4917 , H04L2025/03363 , H04L2025/03802
Abstract: 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.
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公开(公告)号：US11233678B2
公开(公告)日：2022-01-25
申请号：US17000191
申请日：2020-08-21
Applicant: Rambus Inc.
Inventor： Vladimir M. Stojanovic , Andrew C. Ho , Anthony Bessios , Fred F. Chen , Elad Alon , Mark A. Horowitz
Abstract: 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.
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Patent Agency Ranking
公开(公告)号：US20210067384A1
公开(公告)日：2021-03-04
申请号：US17024843
申请日：2020-09-18
Applicant: Rambus Inc.
Inventor： Jared L. Zerbe , Vladimir M. Stojanovic , Fred F. Chen
Abstract: 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.
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公开(公告)号：US10771295B2
公开(公告)日：2020-09-08
申请号：US16548708
申请日：2019-08-22
Applicant: Rambus Inc.
Inventor： Vladimir M. Stojanovic , Andrew C. Ho , Anthony Bessios , Fred F. Chen , Elad Alon , Mark A. Horowitz
Abstract: 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.
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公开(公告)号：US20200084073A1
公开(公告)日：2020-03-12
申请号：US16548708
申请日：2019-08-22
Applicant: Rambus Inc.
Inventor： Vladimir M. Stojanovic , Andrew C. Ho , Anthony Bessios , Fred F. Chen , Elad Alon , Mark A. Horowitz
Abstract: 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.
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公开(公告)号：US20190199563A1
公开(公告)日：2019-06-27
申请号：US16256882
申请日：2019-01-24
Applicant: Rambus Inc.
Inventor： Jared L. Zerbe , Fred F. Chen , Andrew Ho , Ramin Farjad-Rad , John W. Poulton , Kevin S. Donnelly , Brian S. Leibowitz , Vladimir Stojanovic
CPC classification number: H04L27/01 , H04L1/0026 , H04L7/0025 , H04L7/0087 , H04L7/0337 , H04L25/0272 , H04L25/028 , H04L25/03057 , H04L25/03343 , H04L25/03885 , H04L25/497 , H04L2025/03503 , H04W52/20 , H04W52/225 , Y02D70/00
Abstract: A signaling system includes a pre-emphasizing transmitter and an equalizing receiver coupled to one another via a high-speed signal path. The receiver measures the quality of data conveyed from the transmitter. A controller uses this information and other information to adaptively establish appropriate transmit pre-emphasis and receive equalization settings, e.g. to select the lowest power setting for which the signaling system provides some minimum communication bandwidth without exceeding a desired bit-error rate.
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公开(公告)号：US20170338981A1
公开(公告)日：2017-11-23
申请号：US15616408
申请日：2017-06-07
Applicant: Rambus Inc.
Inventor： Vladimir M. Stojanovic , Andrew C. Ho , Anthony Bessios , Fred F. Chen , Elad Alon , Mark A. Horowitz
CPC classification number: H04L25/49 , H04B1/04 , H04B1/0475 , H04B2001/0416 , H04L25/025 , H04L25/028 , H04L25/0282 , H04L25/03019 , H04L25/03343 , H04L25/03885 , H04L25/061 , H04L25/4917 , H04L2025/03363 , H04L2025/03802
Abstract: 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.
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