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公开(公告)号：US12170525B2
公开(公告)日：2024-12-17
申请号：US17993163
申请日：2022-11-23
Applicant: Cisco Technology, Inc.
Inventor： Juergen Hauenschild , Sachidanandam Sundarraju , Jan Louis Sundermeyer
Abstract: An interface circuit that interfaces a digital-to-analog converter (DAC) to a vertical-cavity surface emitting laser. The apparatus includes a first cascode amplifier that receives as input positive and negative differential outputs of the DAC and provides a positive amplified output and a negative amplified output, and a second cascode amplifier having a positive input and a negative input. The positive input of the second cascode amplifier being coupled to the positive amplified output of the first cascode amplifier. The second cascode amplifier is configured to generate a positive amplified current and a negative amplified current at a negative amplified output. The positive amplified current and the negative amplified current are combined and a resulting output current is provided as input to an anode of the laser. A transformer is coupled between the negative amplified output of the first cascode amplifier and the negative input of the second cascode amplifier.
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2.发明公开公开(公告)号：US20240171194A1
公开(公告)日：2024-05-23
申请号：US17993163
申请日：2022-11-23
Applicant: Cisco Technology, Inc.
Inventor： Juergen Hauenschild , Sachidanandam Sundarraju , Jan Louis Sundermeyer
CPC classification number: H03M1/66 , H01S5/183 , H01S5/5027
Abstract: An interface circuit that interfaces a digital-to-analog converter (DAC) to a vertical-cavity surface emitting laser. The apparatus includes a first cascode amplifier that receives as input positive and negative differential outputs of the DAC and provides a positive amplified output and a negative amplified output, and a second cascode amplifier having a positive input and a negative input. The positive input of the second cascode amplifier being coupled to the positive amplified output of the first cascode amplifier. The second cascode amplifier is configured to generate a positive amplified current and a negative amplified current at a negative amplified output. The positive amplified current and the negative amplified current are combined and a resulting output current is provided as input to an anode of the laser. A transformer is coupled between the negative amplified output of the first cascode amplifier and the negative input of the second cascode amplifier.
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