公开(公告)号：US20220190808A1

公开(公告)日：2022-06-16

申请号：US17559960

申请日：2021-12-22

Applicant: Rambus Inc.

Inventor： Masum HOSSAIN ,  Carl W. WERNER

IPC: H03H11/12 ,  H04B1/04 ,  H04B1/58 ,  H04B1/10

Abstract: Disclosed is receiver for a noise limited system. A front-end circuit amplifies and band-limits an incoming signal. The amplification increases the signal swing but introduces both thermal and flicker noise. A low-pass band limitation reduces the thermal noise component present at frequencies above what is necessary for correctly receiving the transmitted symbols. This band limited signal is provided to the integrator circuit. The output of the integrator is equalized to reduce the effects of inter-symbol interference and then sampled. The samples are used to apply low frequency equalization (i.e., in response to long and/or unbalanced strings of symbols) to mitigate the effects of DC wander caused by mismatches between the number of symbols of each kind being received.

公开(公告)号：US20230412213A1

公开(公告)日：2023-12-21

申请号：US18195524

申请日：2023-05-10

Applicant: Rambus Inc.

Inventor： John W. POULTON ,  Frederick A. WARE ,  Carl W. WERNER

IPC: H04B3/56 ,  H04L25/02 ,  G06F13/40 ,  H03F3/24 ,  H04B3/54

CPC classification number: H04B3/56 ,  H04L25/0272 ,  H04B10/50 ,  H03F3/24 ,  H04B3/54 ,  G06F13/4072

Abstract: A single-ended data transmission system transmits a signal having a signal voltage that is referenced to a power supply voltage and that swings above and below the power supply voltage. The power supply voltage is coupled to a power supply rail that also serves as a signal return path. The signal voltage is derived from two signal supply voltages generated by a pair of charge pumps that draw substantially same amount of current from a power supply.

公开(公告)号：US20200212960A1

公开(公告)日：2020-07-02

申请号：US16685861

申请日：2019-11-15

Applicant: Rambus Inc.

Inventor： John W. POULTON ,  Frederick A. WARE ,  Carl W. WERNER

IPC: H04B3/56 ,  H04L25/02 ,  G06F13/40 ,  H03F3/24 ,  H04B3/54

Abstract: A single-ended data transmission system transmits a signal having a signal voltage that is referenced to a power supply voltage and that swings above and below the power supply voltage. The power supply voltage is coupled to a power supply rail that also serves as a signal return path. The signal voltage is derived from two signal supply voltages generated by a pair of charge pumps that draw substantially same amount of current from a power supply.

公开(公告)号：US20240178986A1

公开(公告)日：2024-05-30

申请号：US18516597

申请日：2023-11-21

Applicant: Rambus Inc.

Inventor： Carl W. WERNER ,  Masum HOSSAIN ,  Richelle L. Smith

IPC: H04L7/00

CPC classification number: H04L7/0087 ,  H04L7/0008 ,  H04L7/0091

Abstract: A communication system uses a differential edge modulation scheme having one of four or more values and a clock pulse is also encoded in each unit interval. A four-valued encoding may be as follows: prior to each unit interval, two signals are both at the same value; at the start of the unit interval, a first one of the signals is transitioned to indicate a first bit of the symbol; after a selected one of two delay periods that are less than the unit interval, the other signal to is transitioned indicate a second bit of the symbol; after this transition, both signals are again at the same value. The transitioning, at the start of the unit interval, provides an edge that may be extracted and used a timing reference.

公开(公告)号：US20190260356A1

公开(公告)日：2019-08-22

申请号：US16276677

申请日：2019-02-15

Applicant: Rambus Inc.

Inventor： Masum HOSSAIN ,  Carl W. WERNER

IPC: H03H11/12 ,  H04B1/04 ,  H04B1/10 ,  H04B1/58

Abstract: Disclosed is receiver for a noise limited system. A front-end circuit amplifies and band-limits an incoming signal. The amplification increases the signal swing but introduces both thermal and flicker noise. A low-pass band limitation reduces the thermal noise component present at frequencies above what is necessary for correctly receiving the transmitted symbols. This band limited signal is provided to the integrator circuit. The output of the integrator is equalized to reduce the effects of inter-symbol interference and then sampled. The samples are used to apply low frequency equalization (i.e., in response to long and/or unbalanced strings of symbols) to mitigate the effects of DC wander caused by mismatches between the number of symbols of each kind being received.

公开(公告)号：US20230099474A1

公开(公告)日：2023-03-30

申请号：US17941792

申请日：2022-09-09

Applicant: Rambus Inc.

Inventor： Dongyun LEE ,  Carl W. WERNER ,  Torsten PARTSCH

IPC: H01L25/065 ,  G11C8/12 ,  G11C7/10

Abstract: An interconnected stack of Dynamic Random Access Memory (DRAM) die has a base die and DRAM dies. The base die is interconnected vertically with the DRAM dies using through-silicon via (TSV) connections that carry data and control signals throughout the stack. The data signals of the DRAM dies are interconnected vertically to the base die using separate, non-overlapping, sets of TSVs. In a first configuration, each die in the stack is accessed using unique chip identification numbers. In a second configuration, a single chip identification number is used to access two or more dies in the stack. At least one bit of the chip identification number may be used in determining the row being accessed. Data communicated with dies in the stack may be communicated with the base die using non-overlapping sets of data signal connections.

公开(公告)号：US20210143798A1

公开(公告)日：2021-05-13

申请号：US16952553

申请日：2020-11-19

Applicant: Rambus Inc.

Inventor： Masum HOSSAIN ,  Carl W. WERNER

IPC: H03H11/12 ,  H04B1/04 ,  H04B1/58 ,  H04B1/10

Abstract: Disclosed is receiver for a noise limited system. A front-end circuit amplifies and band-limits an incoming signal. The amplification increases the signal swing but introduces both thermal and flicker noise. A low-pass band limitation reduces the thermal noise component present at frequencies above what is necessary for correctly receiving the transmitted symbols. This band limited signal is provided to the integrator circuit. The output of the integrator is equalized to reduce the effects of inter-symbol interference and then sampled. The samples are used to apply low frequency equalization (i.e., in response to long and/or unbalanced strings of symbols) to mitigate the effects of DC wander caused by mismatches between the number of symbols of each kind being received.

公开(公告)号：US20200382103A1

公开(公告)日：2020-12-03

申请号：US16901767

申请日：2020-06-15

Applicant: Rambus Inc.

Inventor： Masum HOSSAIN ,  Carl W. WERNER

IPC: H03H11/12 ,  H04B1/04 ,  H04B1/58 ,  H04B1/10

Abstract: Disclosed is receiver for a noise limited system. A front-end circuit amplifies and band-limits an incoming signal. The amplification increases the signal swing but introduces both thermal and flicker noise. A low-pass band limitation reduces the thermal noise component present at frequencies above what is necessary for correctly receiving the transmitted symbols. This band limited signal is provided to the integrator circuit. The output of the integrator is equalized to reduce the effects of inter-symbol interference and then sampled. The samples are used to apply low frequency equalization (i.e., in response to long and/or unbalanced strings of symbols) to mitigate the effects of DC wander caused by mismatches between the number of symbols of each kind being received.