Transmission Interface Compensation for Impedance Mismatch and Distortion
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Solution Overview
Problem
Existing transmission interfaces face impedance mismatching and high-frequency distortion due to varying circuit board connections and interference, leading to signal reflection and attenuation, which prior art fails to adequately compensate for.
Innovation Solution
A device and method incorporating a correcting and compensating unit, clock data recovering unit, decoder, calculating unit, and adaptive control unit to adjust impedance and equalization parameters dynamically, generating a compensation signal to match channel impedance and reduce distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a correcting impedance is preset at the receiving end to achieve impedance matching, then signal reflection is reduced, but impedance mismatching still occurs due to varying circuit board connections and cable lines
Solution Approach 1:
The patent applies dynamics by transforming the static preset impedance into a dynamically adjustable impedance. The correcting impedance is changed from a fixed value to one that can be automatically adjusted based on real-time channel impedance detection, enabling the system to adapt to varying circuit board connections and cable lines.
Solution Approach 2:
The patent implements feedback by detecting the actual channel impedance and using this information to automatically adjust the correcting impedance. The system monitors the transmission channel characteristics and feeds this information back to the impedance adjustment mechanism, creating a closed-loop control system that maintains optimal impedance matching.
2Productivity
If parallel signal lines are increased to accelerate transmission speed, then bandwidth demand is met, but PCB layout becomes complicated and clock signal difference worsens
Solution Approach 1:
The patent transitions from parallel transmission to serial transmission, changing the dimensional approach of data transmission. Instead of increasing the number of parallel signal lines (horizontal dimension), the system uses a single serial line with time-division multiplexing (temporal dimension), thereby reducing PCB layout complexity while maintaining high transmission speed.
3Manufacturing precision
If equalizer is used to compensate high frequency component, then signal distortion is reduced, but transmission interface still suffers from impedance mismatching and reflection interference
Solution Approach 1:
The patent applies preliminary action by adjusting the correcting impedance before signal transmission occurs. The system detects channel impedance characteristics and pre-adjusts the correcting impedance to match the channel, preventing reflection and interference before they affect the transmitted signal, rather than attempting to correct them after distortion occurs.
Data Source
AI summary
A device for compensating impedance and gain of a transmission interface is provided. The device includes a correcting and compensating unit, a clock data recovering unit, a decoder, a calculating unit, and an adaptive control unit. The correcting and compensating unit is used to receive a channel signal, and compensate the channel signal according to a control signal to generate a compensation signal. The clock data recovering unit is used to receive the compensation signal and generate a data signal. The decoder is used to decode the data signal and perform detection to generate error information and correct information. The calculating unit is used to count times of generating the error information and times of generating the correct information to accordingly generate reference data. The adaptive control unit is used to receive the reference data and perform calculation to generate the control signal.