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Control method and circuit for line drive output signal waveform

A line driver and output signal technology, applied in the control field of line driver output signal waveform, can solve the problem of small pulse width and achieve the effect of solving instantaneous large current

Inactive Publication Date: 2010-10-06
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The invention provides a method and device for controlling the output signal waveform of a line driver to solve the problem in the prior art that the pulse width of the output signal waveform of the line driver circuit is smaller than the pulse width of the input signal waveform

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  • Control method and circuit for line drive output signal waveform
  • Control method and circuit for line drive output signal waveform
  • Control method and circuit for line drive output signal waveform

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Embodiment Construction

[0040] The problem of asymmetry between the rising and falling edges of the line driver output signal is inherent in the push-pull structure line driver, which is caused by its own switching mode of operation. The present invention changes the output signal I of the pulse shaping circuit without changing the circuit structure and working mode of the line driver. DAC To solve the problem of asymmetry between rising and falling edges.

[0041] The output signal of the pulse shaping circuit I DAC do as Figure 5In the shown change, a period of zero value is added from t2 to t2', and the transition time of the control signal CLAMPP / N is delayed from t2 to t2'. In this way, the first driving part of the line driver is not turned off at time t2, but is still in the working state, and only outputs a zero value signal. Since the working state of the circuit does not change, its output signal will not return to zero instantaneously, but will gradually change to zero with a slope sim...

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Abstract

This invention discloses a control method for output signal waveform from linear driver to solve the problem in existing technique that the pulse width of output signal is less then the input signal. Wherein, the method comprises: providing non-zero input signal for some time from pulse-forming circuit to linear driver, then switching into zero-value input signal and holding for predetermined time length; the said control signal controls one drive part working in predetermined time length to make output pulse signal of linear driver gradual return to zero by similar slope with rising edge under the limit of drive capacity; then the pulse-forming circuit recovers the non-zero signal and the control signal switches the said drive part to non-working state. It also discloses a pulse-forming circuit in the invention.

Description

technical field [0001] The invention relates to a driving technology for transmission signals, in particular to a control method and circuit for outputting signal waveforms of a line driver. Background technique [0002] In a modern communication system, a data signal usually needs to be transmitted over a long distance through a transmission line, and the data signal needs to pass through a line driver (Line Driver) circuit before being sent to the line. The main function of the line driver circuit is to provide sufficient driving capability for the signal and to provide the polarity inversion function of the output waveform. In order to make the signal sent to the line conform to the waveform template stipulated by the communication protocol, a pulse-shaping (Wave-Shaping) circuit is also required to generate an appropriate signal waveform. figure 1 The basic block diagram of the pulse shaping and line driver circuit is given, the output signal of the pulse shaping circui...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03
Inventor 熊涛
Owner HUAWEI TECH CO LTD