Threshold voltage adjusting unit, adjusting method, limit rage amplifier and optical receiver

A limiting amplifier and threshold voltage technology, applied in the field of electrical signal processing, can solve problems such as noise imbalance and high bit error rate, and achieve the effect of reducing influence and bit error rate

Active Publication Date: 2008-01-09
HUAWEI TECH CO LTD
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Problems solved by technology

However, since the received signal has a lot of noise superimposed on it after long-distance transmission, and the noise superimposed on the "1" and "0" logic levels is not balanced, the average value of the maximum level and the minimum level is used As a threshold voltage, it is easy to cause a high bit error rate

Method used

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  • Threshold voltage adjusting unit, adjusting method, limit rage amplifier and optical receiver
  • Threshold voltage adjusting unit, adjusting method, limit rage amplifier and optical receiver
  • Threshold voltage adjusting unit, adjusting method, limit rage amplifier and optical receiver

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Embodiment Construction

[0021] As shown in FIG. 1 , it is a schematic diagram of a first structure of a threshold voltage adjustment unit according to an embodiment of the present invention, including a feedback comparison module 11 , an adjustment module 12 and a digital-to-analog conversion module 13 . The feedback comparison module 11 is used to receive the feedback amount, and determine the adjustment direction of the threshold voltage according to the change of the feedback amount, and the adjustment direction indicates whether the threshold voltage should be increased or decreased by the adjustment step. The adjustment module 12 is used to obtain the adjusted threshold voltage according to the adjustment direction and the adjustment step of the threshold voltage. The digital-to-analog conversion module 13 is used for performing digital-to-analog conversion on the threshold voltage and outputting the converted threshold voltage.

[0022] The feedback quantity can be the bit error rate of the sig...

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Abstract

The threshold voltage adjusting unit comprises: a feedback comparison module used for receiving the feedback quantity, and according to the variation of feedback quantity, determining the adjusting direction of the threshold voltage; a adjusting module used for getting the adjusted threshold voltage according to the adjusting direction of the threshold voltage and the adjusting step length; a D/A converter used for making D/A conversion for the threshold voltage and outputting the converted threshold. The invention can adjust the threshold voltage along with the variation of the signal and reduce the effects from noise to the threshold voltage so as to effectively reduce the error code rate.

Description

technical field [0001] The invention relates to electric signal processing technology, in particular to a threshold voltage adjustment unit, an adjustment method, a limiting amplifier and an optical receiver. Background technique [0002] In a communication system, since the signal is mostly transmitted over long distances and multi-stage amplification, the signal-to-noise ratio will be relatively low and signal distortion will also occur due to the influence of the transmission medium itself and the environment. For example, in an optical communication system, most of the optical signals on the receiving side are transmitted through long-distance optical fibers and multi-stage optical amplification, so the signal-to-noise ratio will be relatively low; at the same time, due to dispersion and nonlinear effects, the signal will be distorted. In this way, in order to obtain correct data, the processing of the received signal is even more critical. [0003] It is an effective m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/148H03G11/00H03G11/04
Inventor 庹勇周峻
Owner HUAWEI TECH CO LTD
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