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An optical module, its signal output port, and a signal output port protection circuit

A signal output and protection circuit technology, which is applied in the direction of logic circuits using optoelectronic devices, logic circuits using specific components, reliability improvement and modification, etc., can solve problems such as damage to optical module chips, and achieve the effect of preventing damage from breakdown

Active Publication Date: 2020-04-28
SOURCE PHOTONICS CHENGDU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the problem that the pull-up power supply HOST VCC at the input end of the host side connected to the signal output end of the existing optical module chip is greater than the pull-up voltage at the output end of the optical module chip RX_VCC+VF (the forward voltage of the TVS diode) For the problem of damage to the module chip, a protection circuit for the signal output of the optical module chip is provided

Method used

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  • An optical module, its signal output port, and a signal output port protection circuit
  • An optical module, its signal output port, and a signal output port protection circuit
  • An optical module, its signal output port, and a signal output port protection circuit

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Embodiment 1

[0038] Embodiment 1: as figure 2 As shown, this embodiment provides an optical module signal output port OC protection circuit, including:

[0039] The input terminal is connected to the base of the first transistor T1 through the second resistor R2, and is used to receive the output signal LOS of the signal output port of the optical module chip;

[0040] a pull-up power supply RX_VCC, connected to the input terminal through a first resistor R1, and used to provide a pull-up voltage for the base of the first transistor T1;

[0041] The first transistor T1, the emitter of the first transistor T1 is grounded; the collector of the first transistor T1 is the output terminal of the OC protection circuit, and the output terminal is connected to the input port on the host side.

[0042] When the output signal LOS of the signal output port of the optical module chip is high level or low level, when its output is low level, the first transistor T1 is turned off. At this time, due to...

Embodiment 2

[0044] Embodiment 2: as image 3 As shown, on the basis of Embodiment 1, the OC protection circuit provided in this embodiment also includes,

[0045] The second transistor T2, the emitter of the second transistor T2 is grounded; the base of the second transistor T2 is connected to the collector of the first transistor T1; the collector of the second transistor T2 is protected by the OC The output end of the circuit, the output end is connected to the input port on the host side;

[0046] The third resistor R3 is arranged between the pull-up power supply and the base of the second transistor T2, and is used for providing a pull-up voltage to the base of the second transistor T2.

[0047] The effect of adding the second transistor T2 is to make the output of the protection circuit consistent with the output of the signal output port of the optical module chip; that is, when the output signal LOS of the signal output port of the optical module chip is low, the first The transi...

Embodiment 3

[0049] Embodiment 3: as figure 2 As shown, the present invention provides an optical module signal output port at the same time, the optical module signal output port includes an optical module chip signal output port, and an OC protection circuit is externally connected to the optical module chip signal output port; The OC includes a circuit that includes an input terminal connected to the base of the first transistor T1 through a second resistor R2 for receiving the output signal LOS of the signal output port of the optical module chip; a pull-up power supply connected to the input terminal through the first resistor R1 Terminal connection, used to provide a pull-up voltage for the base of the first transistor T1; the first transistor T1, the emitter of the first transistor T1 is grounded; the collector of the first transistor T1 is the OC protection circuit The output terminal is connected to the input port on the host side.

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Abstract

The invention relates to the photoelectric field and especially relates to an optical module, a signal output port thereof and a signal output port protection circuit. According to the invention, an OC or OD protection circuit is arranged, an optical module chip is effectively prevented from being directly connected with a pull-up power supply HOST VCC on a host side, and the optical module chip is prevented from being broken down and damaged due to the overlarge HOST VCC. In some embodiments, an anti-phase circuit is arranged to ensure that the output of the OC or OD protection circuit is consistent with the output of the optical module chip signal output port.

Description

technical field [0001] The invention relates to the field of optoelectronics, in particular to an optical module, a signal output port thereof, and a signal output port protection circuit. Background technique [0002] Such as figure 1 As shown, the signal output port of the traditional optical module chip, such as the signal output port of the signal loss LOS signal is an OD gate circuit, and its output terminal is connected to the input terminal of the host side (for receiving the LOS signal), and the input terminal of the host side The terminal is usually provided with a pull-up power supply HOST VCC, and when HOST VCC>optical module chip output pull-up voltage RX_VCC+VF (forward voltage of TVS diode), it will cause damage to the optical module chip. Contents of the invention [0003] The purpose of the present invention is to overcome the problem that the pull-up power supply HOST VCC at the input end of the host side connected to the signal output end of the existing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K19/14H03K19/003
Inventor 谢初旭黄远军许远忠
Owner SOURCE PHOTONICS CHENGDU
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