Invention Grant
- Patent Title: Edge enhancement for signal transmitter
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Application No.: US16817171Application Date: 2020-03-12
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Publication No.: US10887137B2Publication Date: 2021-01-05
- Inventor: Kamran Farzan , Dongyun Lee
- Applicant: Rambus Inc.
- Applicant Address: US CA Sunnyvale
- Assignee: Rambus Inc.
- Current Assignee: Rambus Inc.
- Current Assignee Address: US CA Sunnyvale
- Agency: Lowenstein Sandler LLP
- Main IPC: H04L25/34
- IPC: H04L25/34 ; H04L27/04 ; H04L27/08

Abstract:
A signal transmitter circuit includes an output driver circuit configured to transmit a signal using a multi-level pulse amplitude modulation (PAM) scheme comprising a plurality of discreet signal levels. During operation, the output driver initiates a first transition of the signal to a first level of the multi-level PAM scheme from a second level of the multi-level PAM scheme, and initiates a second transition of the signal to the first level from a third level of the multi-level PAM scheme. The signal transmitter further includes a control circuit configured to control a slew rate of the signal transmitter circuit to cause the signal to reach a threshold voltage level at a first time, the first time occurring a first duration of time after the first transition is initiated, and to cause the signal to reach the threshold voltage level at a second time, the second time occurring the first duration of time after the second transition is initiated.
Public/Granted literature
- US20200295978A1 EDGE ENHANCEMENT FOR SIGNAL TRANSMITTER Public/Granted day:2020-09-17
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