Optical Transceiver Drive Circuit Phase Delay Compensation
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Solution Overview
Problem
Conventional de-emphasis methods fail to distinguish between long-code and short-code high-speed signals, leading to inadequate compensation for group delay and phase delay differences after signals pass through the backplane or laser, resulting in signal integrity issues and increased bit error rates.
Innovation Solution
The implementation of a high-speed optical transceiver integrated chip drive circuit with phase delay compensation, featuring long code phase lead and lag adjustment circuits using operational amplifiers and current sources to separately adjust phases of high-speed data with different code lengths, ensuring effective compensation for group delay and phase delay differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional de-emphasis method is used to compensate for high-frequency attenuation, then frequency attenuation is compensated, but group delay and phase delay difference between long code and short code signals cannot be compensated
Solution Approach 1:
The patent divides the compensation function into separate circuits: a traditional de-emphasis circuit for frequency attenuation compensation, and a new phase delay compensation circuit specifically for long code signals. This segmentation allows each circuit to specialize in compensating for specific types of signal degradation without interfering with the other, thereby resolving the contradiction between general frequency compensation and specific phase delay compensation for different code lengths.
Solution Approach 2:
The patent applies different compensation strategies to different signal types: short code signals receive traditional de-emphasis compensation, while long code signals receive additional phase delay compensation through the operational amplifier circuit. This local quality approach ensures that each signal type receives the appropriate compensation method, improving overall signal integrity without applying unnecessary complexity to all signals.
2Device complexity
If conventional de-emphasis circuit is used, then circuit structure is simple, but phase delay compensation for long code and short code signals is insufficient
Solution Approach 1:
The patent segments the compensation system into two independent parts: the original simple de-emphasis circuit and the new phase delay compensation circuit. This segmentation maintains the simplicity of the original circuit while adding precise phase delay compensation functionality, thereby resolving the contradiction between circuit simplicity and compensation precision.
Solution Approach 2:
The operational amplifier circuit acts as an intermediary component that processes long code signals separately before they enter the main transmission path. This intermediary structure allows precise phase delay compensation to be applied selectively without disrupting the simple structure of the original de-emphasis circuit, achieving both simplicity and precision.
Data Source
AI summary
A high-speed optical transceiver integrated chip drive circuit with phase delay compensation function includes a transmitting end drive circuit to drive the laser to emit light to transmit signals and a receiving end drive circuit to optimize the signal degradation caused by the signal sent by the transmitting end drive circuit to the laser via the transmission backplane; a long code phase lead adjustment circuit is arranged on the main channel of the transmitting end drive circuit, and a long code phase lag adjustment circuit is set on the main channel of the receiving end drive circuit. The present invention is used to optimize high-speed signals and solve the problem that the CML drive circuit at the receiving end or the laser drive circuit at the transmitting end cannot compensate the difference between the group delay and phase delay for the high-speed signal after passing through the backplane (Laser device).