公开(公告)号：US10389555B2

公开(公告)日：2019-08-20

申请号：US16065409

申请日：2016-01-28

Applicant: Hewlett Packard Enterprise Development LP

Inventor： Dacheng Zhou ,  Daniel Alan Berkram ,  Peter David Maroni

IPC: H04L25/03 ,  H04L7/00 ,  H04L25/49 ,  H04L7/033

Abstract: A technique includes determining a first phase delay associated with communication of a bit pattern having a first bit transition frequency over a communication channel; and determining a second phase delay associated with communication of a bit pattern having a second bit transition frequency greater than the first bit transition frequency over the communication channel. The technique includes regulating a compensation applied to a signal received from the communication channel based at least in part on a difference of the first and second phase delays.

公开(公告)号：US11581949B1

公开(公告)日：2023-02-14

申请号：US17461407

申请日：2021-08-30

Applicant: HEWLETT PACKARD ENTERPRISE DEVELOPMENT LP

Inventor： Ronaldo Sanchez ,  Gilbert Yoh ,  Zhubiao Zhu ,  Daniel Alan Berkram

IPC: H04B10/00 ,  H04B10/58 ,  H04B10/2543

Abstract: An optical or an optoelectronic device and methods are provided for data transmission across two interconnects. First, an electrical signal is obtained from an interconnect. Next, the electrical signal is modulated. Within the modulated electrical signal, an occurrence of a transition is determined, in which a change in a power of the electrical signal by more than a threshold amount. In response to the determination of the occurrence of the transition, coefficients indicative of respective amounts of compensation to resolve or mitigate nonlinearities associated with the transition are determined. According to the coefficients, a filter is applied in a vicinity of the transition to obtain a modified electrical signal. The modified electrical signal is converted into an optical signal and coupled to a fiber to transmit the optical signal to a destination at a second interconnect.

公开(公告)号：US11196593B1

公开(公告)日：2021-12-07

申请号：US16943834

申请日：2020-07-30

Applicant: Hewlett Packard Enterprise Development LP

Inventor： Dacheng Zhou ,  Daniel Alan Berkram ,  Ryan Barnhill

IPC: H04L25/03 ,  H03K5/24 ,  G06F1/06 ,  H04L27/04 ,  H03K19/20

Abstract: One embodiment can provide a sampler for a decision feedback equalizer (DFE). The sampler can include a comparator comprising a resolver and a plurality of amplifiers coupled to the resolver. The plurality of amplifiers are to receive an input signal and one or more feedback signals, and the plurality of amplifiers are coupled to each other in parallel, thereby facilitating a summation of the input signal and the one or more feedback signals. The comparator is to generate an output based on the summation of the input signals and the one or more feedback signals. The sampler can further include an inverter to invert the output of the comparator. The inverted output of the inverter is sent to a tap-1 amplifier to generate a tap-1 feedback signal to be sent to the comparator at a next unit interval (UI).

公开(公告)号：US20200153201A1

公开(公告)日：2020-05-14

申请号：US16186822

申请日：2018-11-12

Applicant: HEWLETT PACKARD ENTERPRISE DEVELOPMENT LP

Inventor： Zhubiao Zhu ,  Clinton Harold Parker ,  Daniel Alan Berkram

IPC: H01S5/042 ,  H01S5/183 ,  H01S5/06 ,  H01S3/13

Abstract: A push-pull circuit for an opto-electronic device includes: an output node; a pull-up circuit that, in operation, controls a falling edge rate of an input signal to the opto-electronic device while sharing charge with the output node; and a pull-down circuit that, in operation, controls a rising edge rate of the input signal to the opto-electronic device while sharing charge with the output node.

公开(公告)号：US20190334617A1

公开(公告)日：2019-10-31

申请号：US15965773

申请日：2018-04-27

Applicant: HEWLETT PACKARD ENTERPRISE DEVELOPMENT LP

Inventor： Zhubiao Zhu ,  Clinton Harold Parker ,  Daniel Alan Berkram

IPC: H04B10/079 ,  H04B10/50 ,  H04B10/58 ,  H04L25/03

Abstract: A device, including a switch configured to couple a current source with an output terminal upon receipt of a data signal, is provided. The device also includes a first variable capacitor coupled in parallel to the current source at a common node on a source terminal of the switch, wherein the first variable capacitor comprises multiple capacitive elements coupled in parallel and configured to be activated by a programmable signal, and wherein the programmable signal is selected to increase a charge transfer rate from an output terminal coupled to a load, when the switch is turned on. A system and a serial interface including the above device are also provided.

公开(公告)号：US10153611B2

公开(公告)日：2018-12-11

申请号：US15500081

申请日：2015-04-09

Applicant: HEWLETT PACKARD ENTERPRISE DEVELOPMENT LP

Inventor： Dacheng Zhou ,  Daniel Alan Berkram ,  Zhubiao Zhu

IPC: H01S5/042 ,  H03K19/0185 ,  H01S5/183 ,  H03K19/00

Abstract: An example driver circuit includes a termination voltage circuit and a termination element coupled to the termination voltage circuit. The driver circuit also includes a current source switch coupled the termination element via a node. The driver circuit further includes a current source coupled to the current source switch. The current source switch and the termination voltage circuit are controlled via a control signal. The termination voltage circuit is to generate a termination voltage to match a node voltage of the node based on the control signal. The driver circuit further includes a load coupled to the termination element and the current source switch via the node. The driver circuit further includes a load voltage source coupled to the load. The node voltage is generated based on the load and the load voltage source.