High-speed serial signal loss detection circuit

A technology for signal loss and circuit detection, applied in the direction of measuring electrical variables, measuring current/voltage, measuring devices, etc., can solve the problems of delayed alarm time, the circuit cannot detect the input signal in real time, etc., to achieve small output delay and meet low delay. Effect of time alarm request

Active Publication Date: 2021-02-09
CHENGDU SINO MICROELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the received signal is suddenly lost, it takes a period of time for the output of the peak detection circuit to decay below the alarm level, so that the circuit cannot detect the input signal in real time to output the correct ALOS signal, delaying the alarm time

Method used

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  • High-speed serial signal loss detection circuit
  • High-speed serial signal loss detection circuit
  • High-speed serial signal loss detection circuit

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Embodiment Construction

[0012] A high-speed serial signal loss detection circuit of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0013] image 3 It is a schematic diagram of the high-speed serial signal loss detection circuit of the present invention, such as image 3 As shown, it includes a voltage magnitude comparator and a toggle rate counting and comparator; wherein, the voltage magnitude comparator is composed of a voltage magnitude comparator 1 and a voltage magnitude comparator 2, and the flipping rate counting and comparator includes 1 to D-type flip-flop DFF1, 1 to D-type flip-flop DFF2, 1 to D-type flip-flop DFF3, 1 to D-type flip-flop DFF4, clock divider DIV4, demultiplexer DEMUX1 and DEMUX2, N-bit counter 1, N-bit counter 2, counting comparator 1, counting comparator 2, and gate.

[0014] The input RXP and input RXN are the signals to be detected, and the voltage threshold VTH sets different thresholds through the register. The...

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Abstract

The invention discloses a high-speed serial signal loss detection circuit which comprises a voltage amplitude comparator and a turnover rate counting and comparing circuit. Dual judgment of the voltage amplitude comparator and the turnover rate counting and comparing circuit is adopted, the condition that the loss state of the input signal from short circuit to high level is judged to be normal bysingly using the voltage amplitude comparator is avoided; meanwhile, the signal loss detection circuit can directly process low-amplitude normal signals, the circuit module contained in the signal loss detection circuit can work when high-frequency signals are inputted, the output delay of detection results is extremely small, and the low-delay alarm requirements of various communication protocols can be met.

Description

technical field [0001] The invention belongs to the field of integrated circuit design, in particular to a high-speed serial signal loss detection circuit. Background technique [0002] The high-speed serial signal has its particularity. The normal signal voltage range is wide and can range from 50mV to 1600mV. When the normal signal is lost (Loss of Signal, referred to as LOS), the input signal line may be short-circuited with other voltage planes, and it will As a result, there is a DC level in the normal signal, and there may also be a large noise. The DC level contained in the normal signal input may be equivalent to the voltage amplitude of the strong normal signal, and the noise may be equivalent to the voltage amplitude of the weak normal signal. Directly using the level comparison method will cause misjudgment. When the normal signal is weak, the voltage range of the pin input signal is extremely low and cannot be directly processed by a digital circuit, so it is di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/165G01R19/17
CPCG01R19/16557G01R19/17
Inventor 湛伟马淑彬丛伟林
Owner CHENGDU SINO MICROELECTRONICS TECH CO LTD
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