Invention Grant
- Patent Title: Multi-level signal clock and data recovery
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Application No.: US16421376Application Date: 2019-05-23
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Publication No.: US10911052B2Publication Date: 2021-02-02
- Inventor: Bengt Littmann , George L. Barrier, IV , Atul Gupta
- Applicant: MACOM Technology Solutions Holdings, Inc.
- Applicant Address: US MA Lowell
- Assignee: MACOM Technology Solutions Holdings, Inc.
- Current Assignee: MACOM Technology Solutions Holdings, Inc.
- Current Assignee Address: US MA Lowell
- Agency: Weide & Miller, Ltd.
- Main IPC: H03L7/081
- IPC: H03L7/081 ; H04L27/227 ; G04F10/00 ; G06F1/06 ; G06F1/12 ; G06F1/10 ; H04L25/49 ; H04L7/033 ; H04L27/38 ; H04L7/00

Abstract:
A system for retiming a multi-level signal that forms an eye diagram when plotted, such as a PAM4 signal that includes an equalizer configured to create an equalized signal and a first amplifier configured to amplify the equalized signal, responsive to a first amplifier control signal, to create a first amplified signal, and a second amplifier configured to amplify the equalized signal, responsive to a second amplifier control signal, to create a second amplified signal. An eye monitor processes the equalized signal, the first amplified signal, and the second amplified signal to create a first retiming clock phase signal and a second retiming clock phase signal, which control sampling times for flip-flops. One or more delays and one or more emphasis modules are configured to delay and introduce emphasis into an output from the flip-flops, the resulting signals are combined in a summing junction to create the retimed signal.
Public/Granted literature
- US20200007133A1 MULTI-LEVEL SIGNAL CLOCK AND DATA RECOVERY Public/Granted day:2020-01-02
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