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公开(公告)号：US20230396406A1
公开(公告)日：2023-12-07
申请号：US18454679
申请日：2023-08-23
申请人： Litrinium, Inc.
发明人： Bertrand Misischi
CPC分类号： H04L7/0016 , H04L25/4917 , H03K5/082
摘要： A method of reducing bit error rate in a PAM4 clock data recovery circuit is described. The method includes determining a first target value of a slicing level, sweeping down from an upper voltage threshold to determine a first reference voltage value, and detecting a first filtered analog output associated with the first reference voltage value. The method also includes sweeping up from a lower voltage threshold to determine a second reference voltage value and detecting a second filtered analog output associated with the second reference voltage value. The first reference voltage value and the second reference voltage value are averaged to determine a calculated threshold value.
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公开(公告)号：US20240275349A1
公开(公告)日：2024-08-15
申请号：US18169768
申请日：2023-02-15
申请人： Litrinium, Inc.
发明人： Kashif Ahmed , Jichun Zhang
CPC分类号： H03G3/30 , H01S5/042 , H03G2201/103
摘要： A laser driver chipset for providing a signal to a laser diode is described. The laser driver chipset has a variable gain amplifier (VGA) circuit and a laser driver circuit. The VGA circuit is configured to receive an input signal having a variable swing amplitude and modulate it to produce a fixed swing amplitude. The laser driver circuit is configured to receive a VGA output signal from the VGA circuit and generate a linear output response to the input signal such that it provides an output current to drive the laser diode. The VGA circuit can comprise a first loop for biasing the direct current level to a target direct current level and a second loop for modulating the variable swing amplitude of the input signal to produce a fixed swing amplitude.
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公开(公告)号：US11115251B1
公开(公告)日：2021-09-07
申请号：US17156346
申请日：2021-01-22
申请人： Litrinium, Inc.
发明人： Sebastien Douyere
摘要： In a system for calibrating PAM4 signals, an equalizer determines a first signal amplitude measurement of the PAM4 signal. The equalizer determines a first signal boost measurement of the PAM4 signal. The equalizer determines whether the first signal boost measurement and the signal amplitude measurement are substantially consistent with each other. Responsive to determining that the signal boost and the signal amplitude are not substantially consistent with each other, the equalizer determines a reference amplification modification and calibrates a PAM4 signal according to the determined reference amplification modification.
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公开(公告)号：US11757611B2
公开(公告)日：2023-09-12
申请号：US17227330
申请日：2021-04-11
申请人： Litrinium, Inc.
发明人： Bertrand Misischi
CPC分类号： H04L7/0016 , H03K5/082 , H04L25/4917
摘要： A PAM4 signal processor calibrates slicing thresholds to reduce bit error rate in a PAM4 clock data recovery circuit by determining a first target value of a first slicing level. The PAM4 signal processor is configured to retrieve the first target value of the first slicing level and sweeps a first reference voltage down from the upper voltage threshold. The PAM4 signal processor is further configured to detect a first filtered output associated with the first reference voltage and determines whether the first filtered output is higher than a target value. Responsive to determining that the first filtered output is higher than the target value, the PAM4 signal processor stores the first reference voltage value.
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公开(公告)号：US09899797B2
公开(公告)日：2018-02-20
申请号：US15461431
申请日：2017-03-16
申请人： Litrinium, Inc.
CPC分类号： H01S5/0427 , H01S5/0617 , H01S5/06808 , H01S5/06832
摘要： A laser diode driving method that reliably maintains average optical power and extinction ratio is disclosed. The present invention for laser driving uses a preloaded laser diode characteristic curve/table and/or mathematical equations to create a programmable bias and modulation current range. This ensures stable closed-loop operation and prevents system failure if the feedback signal is impaired by confining the operation of the laser diode to a normal operating range.
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公开(公告)号：US20220329404A1
公开(公告)日：2022-10-13
申请号：US17227330
申请日：2021-04-11
申请人： Litrinium, Inc.
发明人： Bertrand Misischi
IPC分类号： H04L7/00
摘要： A PAM4 signal processor calibrates slicing thresholds to reduce bit error rate in a PAM4 clock data recovery circuit by determining a first target value of a first slicing level. The PAM4 signal processor is configured to retrieve the first target value of the first slicing level and sweeps a first reference voltage down from the upper voltage threshold. The PAM4 signal processor is further configured to detect a first filtered output associated with the first reference voltage and determines whether the first filtered output is higher than a target value. Responsive to determining that the first filtered output is higher than the target value, the PAM4 signal processor stores the first reference voltage value
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公开(公告)号：US10027286B2
公开(公告)日：2018-07-17
申请号：US15616820
申请日：2017-06-07
申请人： Litrinium, Inc.
IPC分类号： H03F1/00 , H03F1/42 , H03G3/30 , H03F3/08 , H04B10/50 , H04B10/564 , H04B10/572
摘要： A system to program parameters of one or more stages of a transimpedance amplifier (TIA) in an optical sub-assembly (e.g. TO-can package) is disclosed. With this invention, users have the option/flexibility to discretely program any of the stages of the TIA after production of the sub-assembly, i.e. they can still change the TIA settings once the TIA has been installed in a system and the system is in use.
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