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Electrical level output device for guaranting maximum voltage headroom and its method

A technology with the largest margin, applied in measuring devices, adjusting electrical variables, data processing power supplies, etc., can solve the problem of inflexible reference voltage adjustment, achieve large voltage margin, solve inter-symbol interference, and change flexibly.

Inactive Publication Date: 2008-02-20
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The present invention provides a level output device and its method that guarantee the maximum voltage margin, to solve the problems in the prior art that the adjustment of the reference voltage is inflexible and easily affected by other factors to generate a bit error rate

Method used

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  • Electrical level output device for guaranting maximum voltage headroom and its method
  • Electrical level output device for guaranting maximum voltage headroom and its method
  • Electrical level output device for guaranting maximum voltage headroom and its method

Examples

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Effect test

Embodiment 1

[0078] In this embodiment, a level output device that ensures the maximum voltage margin is proposed, as shown in Figure 5 and Figure 6, including a signal input module, a reference voltage output module and a threshold level judgment module, wherein:

[0079] The signal input module is configured to transmit input signals to the reference voltage output module and the threshold level judgment module;

[0080] The reference voltage output module is configured to output a reference voltage to the threshold level judgment module, and adjust the output value of the next reference voltage according to the current input signal of the signal input module;

[0081] The threshold level judging module is used to determine the current output signal according to the current input signal and the current reference voltage.

[0082] The reference voltage output module in this embodiment is an FIR filter, as shown in FIG. 6, the filter at least includes:

[0083] a shift register group, use...

Embodiment 2

[0095] The principle of this embodiment is the same as that of Embodiment 1, as shown in FIG. 7 , the difference is that this embodiment also includes a coefficient adaptive adjustment module, which is used to receive the input signal currently transmitted by the signal input module, the reference voltage output The reference voltage currently output by the module and the threshold level determine the current output signal of the module, and adjust the coefficients in the coefficient group of the filter according to the three signals.

[0096] In this embodiment, the coefficient adaptive adjustment module includes:

[0097] A sum and difference circuit, configured to obtain an error signal according to the current input signal, the current reference voltage and the current output signal;

[0098] a coefficient calculation unit, configured to calculate and obtain the filter coefficients according to the error signal obtained by the sum and difference circuit;

[0099] A coeffi...

Embodiment 3

[0137] Referring to Figure 5 and Figure 12, the principle of this embodiment is the same as that of Embodiment 1, the difference is that the reference voltage output module in this embodiment is an IIR filter, and the filter at least includes:

[0138] The first differential circuit is used to obtain the difference between the current input signal and the current output reference voltage;

[0139] a shift register group, used to store the difference generated by the first difference making circuit;

[0140] a coefficient group for storing coefficients required for outputting the reference voltage;

[0141] a multiplier for multiplying the difference stored in the set of shift registers with the coefficients in the set of coefficients;

[0142] The adder is used for summing the multiplication results obtained by the multiplier, and outputting the next reference voltage.

[0143] When using the device described in this embodiment, referring to FIG. 12, when the input signal is...

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Abstract

The utility model discloses a level output device with maximal headroom, comprising a signal input module, a reference voltage output module and a threshold level judgment module, wherein, the signal input module is used for transmitting the input signal to the reference voltage output module and the threshold level judgment module; the reference voltage output module is used for outputting the reference voltage to the threshold level judgment module and modulating the output value of next reference voltage according to the input signal of the signal input module; the threshold level judgment module is used for determining the output signal according to the current input signal and reference voltage. At the same time, the utility model provides also a level output method for guaranteeing the maximal headroom. The reference voltage of the utility model is not fixed value but can be adjusted by flexible self-adapting according to the actual change of the input signal, enabling the output level with maximal headroom.

Description

technical field [0001] The invention relates to a voltage regulation technology, in particular to a level output device and a method for ensuring the maximum voltage margin. Background technique [0002] In communication systems, computer systems, and other electronic systems, IC chips are usually interconnected by using a bus. One end of the bus is usually connected to a sending chip, and the other end is connected to a receiving chip. When communication between IC chips is required, the sending chip sends communication data, and the data is transmitted to the receiving chip through the bus. Usually, after the receiving chip receives the data, the receiving chip will use the method of input comparison to determine the high and low level characteristics of the received data. The method of input comparison is generally realized by means of a threshold level judger. The threshold level judger is essentially a voltage comparator. The threshold level judger has two inputs, one ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/10G06F1/26
Inventor 黄春行贾功贤汪伦
Owner HUAWEI TECH CO LTD
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