A Data Transmission Link Fault Monitoring Technology Based on AC-Coupled LVDS Standard

Abstract

The invention discloses a data transmission link fault monitoring technology based on the AC-coupled LVDS standard. The input signal bias voltage establishment circuit establishes a suitable DC bias working voltage for the AC-coupled input data signal, and then the input data signal After being amplified by the rated voltage gain, the amplified input data signal is further transmitted to the common-mode adjustment circuit, and the common-mode adjustment circuit adjusts the common-mode voltage of the amplified input data signal to the amplitude voltage After the threshold value matches the potential, the amplitude difference comparison circuit compares the input data signal bit by bit, and finally the comparison result is transmitted to the logic judgment integration circuit after low-pass filtering by the integration circuit for judgment; the link fault monitoring technology of the present invention is relatively based on The technical scheme of envelope detection has faster detection speed and has outstanding advantages in reliability, judgment speed and wide application.

Description

technical field [0001] The invention relates to a link fault monitoring technology, in particular to a data transmission link fault monitoring technology based on an AC-coupled LVDS standard, and belongs to the technical field of high-speed data transmission based on a low-voltage differential signal (LVDS) standard. Background technique [0002] With the continuous improvement of data transmission rate, high-speed data transmission using low-voltage differential signaling (LVDS) technology has been widely used in consumer electronics, high-speed computer peripherals and systems such as telecom / network and automotive electronics. The LVDS standard is a small-swing differential signal technology, which has the advantages of high speed, low power consumption, low noise, low EMI, and low cost. Therefore, it solves the speed and performance of high-speed data transmission in a very wide range of applications. Bottleneck problem; In the development process of the technology indus...

AI Technical Summary

Problems solved by technology

[0008] 1. For a relatively wide operating voltage range, there is no flexibility to set the bias voltage;

[0009] 2. Causes unbalanced receiver thresholds, degrades duty cycle performance, and increases jitter;

[0011] 4. Due to the poor matching between the external short-circuit resistance and the on-chip resistance, the yield rate of the receiver in mass production will be reduced

[0013] 1. For point-to-point applications with multi-point or Gbps data rates, the common-mode load capacitance of the transmitter will be increased, and the fault protection function will be added to increase the activation delay;

[0014] 2. Due to the influence of factors such as manufacturing process, temperature, power supply voltage range and power supply noise, it is difficult to accurately generate the comparison reference voltage of VCC-0.3V;

[0015] 3. In order to achieve noise suppression of the input signal, it is also necessary to add a hysteresis circuit in the receiving comparison circuit; the hysteresis circuit will increase the inter-symbol interference (Inter-Symbol Interface, ISI) on the signal path, thereby increasing the bit error rate at the receiving end

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