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1. 发明授权

US10790636B1 H-bridge integrated laser driver 有权
公开(公告)号：US10790636B1
公开(公告)日：2020-09-29
申请号：US16874464
申请日：2020-05-14
申请人： Karim Vincent Abdelhalim , Michael Q. Le
发明人： Karim Vincent Abdelhalim , Michael Q. Le
IPC分类号： H01S5/042 , H03K5/003 , H03M1/66
摘要： 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.

2. 发明授权

US10951250B1 High-speed DC shifting predrivers with low ISI 有权
公开(公告)号：US10951250B1
公开(公告)日：2021-03-16
申请号：US16855945
申请日：2020-04-22
申请人： Karim Vincent Abdelhalim , Michael Q. Le
发明人： Karim Vincent Abdelhalim , Michael Q. Le
IPC分类号： H04K1/02 , H04B1/04 , H04L25/03 , H03K5/003
摘要： A DC-shifting predriver has an input port configured for coupling to a serial data stream, an inverting output amplifier having an feedback node and an output port configured for coupling to a transistor at the input to a high-speed DAC or TX driver, and a capacitor AC-coupled between the input port and the feedback node. A weak feedback inverter having structure similar to, but less drive strength than the inverting output amplifier is coupled between the output port and the feedback node to act as a positive feedback latch. The predriver provides a DC shift up to 3V with high reliability and minimal intersymbol interference for data rates from 10 GS/s to 28 GS/s or higher. The predriver may provide multiple input ports implemented as a predriver array in an M-bit system, and the output amplifier may consist of N stages.

3. 发明申请

US20210028597A1 H-Bridge Integrated Laser Driver 有权
公开(公告)号：US20210028597A1
公开(公告)日：2021-01-28
申请号：US17035664
申请日：2020-09-28
申请人： Karim Vincent ABDELHALIM , Michael Q. LE
发明人： Karim Vincent ABDELHALIM , Michael Q. LE
IPC分类号： H01S5/042 , H03K5/003 , H03M1/66
摘要： 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.

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