Invention Grant
- Patent Title: H-bridge integrated laser driver
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Application No.: US17035664Application Date: 2020-09-28
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Publication No.: US11894655B2Publication Date: 2024-02-06
- Inventor: Karim Vincent Abdelhalim , Michael Q. Le
- Applicant: SITRUS TECHNOLOGY CORPORATION
- Applicant Address: CN Shanghai
- Assignee: SITRUS TECHNOLOGY CORPORATION
- Current Assignee: SITRUS TECHNOLOGY CORPORATION
- Current Assignee Address: CN Shanghai
- Agency: HAUPTMAN HAM, LLP
- Main IPC: H01S5/042
- IPC: H01S5/042 ; H03K5/003 ; H03M1/66 ; H04B1/04 ; H04L25/03

Abstract:
An H-bridge integrated laser driver optimizes power dissipation, impedance matching, low-swing and high-swing reliability for electro-absorption modulated laser (EML) and directly modulated laser diode (DML) applications. The laser driver includes a retimer for converting low-speed parallel data to a high-speed serial bit stream and to an inverted representation of the high-speed parallel bit stream, an M-bit PMOS DAC configured to receive a first buffered bit stream, an N-bit NMOS DAC configured to receive a second buffered bit stream substantially synchronized with the first buffered bit stream. A protective device is coupled between the M-bit DAC and the N-bit DAC. A first DC level-shifting predriver array is coupled between the retimer and the M-bit DAC to receive the high-speed parallel bit stream and the inverted high-speed parallel bit stream, and a second DC level-shifting predriver array is coupled between the retimer and the N-bit DAC to receive the high-speed parallel bit stream and the inverted high-speed parallel bit stream. An impedance matching module is coupled to an output of the protective device. The laser driver may be integrated on a CMOS communication chip.
Public/Granted literature
- US20210028597A1 H-Bridge Integrated Laser Driver Public/Granted day:2021-01-28
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