Differential Driver Feedback Switching for Selective Slew Rate Control
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Solution Overview
Problem
Traditional SERDES designs can only slow down the slew rate of the transmitter driver and fail to speed it up, necessitating improvements to selectively control the slew rate.
Innovation Solution
A driver circuit incorporating a differential driver and two feedback passive circuits, which can be cross-coupled or parallel-coupled, and a switch circuit to switch between modes, allowing for the selective speeding up or slowing down of the slew rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional delay line and capacitor designs are used, then the slew rate of the transmitter driver is slowed down, but the slew rate cannot be speeded up
Solution Approach 1:
The patent implements dynamic control of the slew rate by using switch circuits to selectively connect different feedback paths (first and second feedback passive circuits) based on operational mode. This allows the system to transition between different slew rate characteristics dynamically, enabling both speeding up and slowing down of the transmitter driver as needed.
Solution Approach 2:
The feedback passive circuits are designed to serve multiple functions: they can be connected in different configurations (first feedback path for slowing down, second feedback path for speeding up) to achieve both slew rate reduction and enhancement. This multi-functional design resolves the contradiction by making the same hardware components adaptable to different operational requirements.
2Adaptability or versatility
If feedback passive circuits are added to control slew rate, then selective control is achieved, but device complexity increases
Solution Approach 1:
The patent merges the slew rate control function with the existing feedback structure of the differential driver. The first and second feedback passive circuits are integrated into the existing half circuits, and the switch circuits are combined with the feedback paths. This merging approach minimizes additional complexity while achieving selective control capability.
Solution Approach 2:
The feedback control is segmented into two distinct paths (first feedback passive circuit and second feedback passive circuit), each handling different slew rate control functions. This segmentation allows independent optimization of each feedback path while maintaining overall system manageability, reducing the complexity burden of having multiple feedback mechanisms.
Data Source
AI summary
A driver circuit is provided. The driver circuit includes a differential driver, a first feedback passive circuit and a second feedback passive circuit. The differential driver includes a first half circuit and a second half circuit. The first half circuit has a first input point and a first output point. The second half circuit has a second input point and a second output point. The first feedback passive circuit is coupled to the second input point and the first output point. The second feedback passive circuit is coupled to the first input point and the second output point.