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Eye pattern cross point adjusting circuit and design method thereof

A technology for regulating circuits and cross points, applied in the direction of negative feedback circuit layout, electrical components, electromagnetic transmitters, etc., can solve the problem that the signal duty ratio imbalance cannot be completely eliminated, and achieve stable output load characteristics, flexible use, eye diagram The effect of mass reduction

Pending Publication Date: 2021-07-13
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Considering the impact of the driver itself and the channel loss on the signal quality during data transmission, the duty cycle automatic adjustment function of the clock module or time data recovery module may not be able to completely eliminate the signal duty cycle imbalance

Method used

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  • Eye pattern cross point adjusting circuit and design method thereof
  • Eye pattern cross point adjusting circuit and design method thereof
  • Eye pattern cross point adjusting circuit and design method thereof

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Embodiment Construction

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0037] In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediar...

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PUM

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Abstract

The invention discloses an eye pattern cross point adjusting circuit and a design method thereof. The DCOC direct current offset compensation loop is connected to the head end and the tail end of the multi-stage limiting amplifier, which is used for amplifying the output deviation and then feeding back the output deviation to the input of the multi-stage limiting amplifier, and amplification and amplitude limiting are carried out through the multi-stage limiting amplifiers LA1-LAn; meanwhile, the duty ratio and the DC point position of the signal are changed, a direct current pre-imbalance unit is embedded between the multiple stages of limiting amplifiers, and DC compensation is carried out at the LAn position containing the direct current pre-imbalance unit, so that the position of the cross point of the eye diagram is changed. According to the invention, the structure is independent of a clock unit, the signal duty ratio change is realized at a driver level, the offset of a rear level can be compensated in advance, and the system flexibility is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of optical communication chip design, and in particular relates to an eye diagram intersection adjustment circuit and a design method thereof. Background technique [0002] With the increase of data transmission rate year by year, optical carrier has a pivotal position in the field of communication by virtue of its huge capacity. In the optical communication system, the laser driver is used to convert the voltage signal into a current signal, and emits the corresponding optical power signal through the laser, and the duty ratio distortion will seriously affect the eye diagram quality of the output signal. The method of adjusting the eye diagram intersection point can be It can be roughly divided into a digital implementation method that automatically adjusts after calculating the duty cycle deviation, and an analog method that controls the common mode point of the input stage. Considering the impact of the ...

Claims

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Application Information

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IPC IPC(8): H03F1/34H04B10/50
CPCH03F1/34H04B10/503
Inventor 李丹谭琛李成耿莉
Owner XI AN JIAOTONG UNIV
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