Invention Grant
- Patent Title: Photonic transmitter drivers with logic using cascaded differential transistor pairs stepped by supply voltage differences
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Application No.: US16794330Application Date: 2020-02-19
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Publication No.: US11239633B2Publication Date: 2022-02-01
- Inventor: Ajey Poovannummoottil Jacob , Solomon M. Serunjogi , Mihai Adrian Tiberiu Sanduleanu
- Applicant: GLOBALFOUNDRIES U.S. INC. , KHALIFA UNIVERSITY OF SCIENCE AND TECHNOLOGY
- Applicant Address: US NY Malta; AE Abu Dhabi
- Assignee: GLOBALFOUNDRIES U.S. INC.,KHALIFA UNIVERSITY OF SCIENCE AND TECHNOLOGY
- Current Assignee: GLOBALFOUNDRIES U.S. INC.,KHALIFA UNIVERSITY OF SCIENCE AND TECHNOLOGY
- Current Assignee Address: US NY Malta; AE Abu Dhabi
- Agency: Gibb & Riley, LLC
- Agent David A. Cain, Esq.
- Main IPC: H01S5/042
- IPC: H01S5/042 ; H03K7/02 ; G02F1/03 ; H04L25/49 ; H03K19/00 ; H03K19/0175 ; H03K19/0185 ; H04L25/03

Abstract:
A driver circuit includes digital inputs, such as a first digital input and a second digital input. The digital inputs receive voltages at either a digital high-voltage or a digital low-voltage. The driver circuit has a clock input, an analog output, a first differential pair of transistors connected to the analog output, second differential pairs of transistors connected to the analog output, and voltage limiters connected to the clock input and the second differential pairs of transistors. The voltage limiters supply different voltages to the second differential pairs of transistors, which results in the second differential pairs of transistors providing analog signals to the analog output that are at different voltage steps at, and between, the digital high-voltage and the digital low-voltage.
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