I/O interface driving circuit capable of automatically controlling noise

An interface drive and noise technology, applied in the direction of logic circuit connection/interface layout, etc., can solve the problem of insufficient noise suppression capability, and achieve the effect of improving noise suppression capability and preventing output signal voltage overshoot.

Inactive Publication Date: 2015-11-04
镇江天美信息科技有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an I / O interface drive circuit for automatic noise control, which has solved the problem of insufficient noise suppression ability of the I / O interface circuit in the prior art

Method used

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  • I/O interface driving circuit capable of automatically controlling noise
  • I/O interface driving circuit capable of automatically controlling noise
  • I/O interface driving circuit capable of automatically controlling noise

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Embodiment Construction

[0032] The specific implementation manner of the present invention will be described in more detail below with reference to schematic diagrams. Advantages and features of the present invention will be apparent from the following description and claims. It should be noted that all the drawings are in a very simplified form and use imprecise scales, and are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention.

[0033] The present invention provides a kind of I / O interface drive circuit of automatic noise control, such as figure 2 As shown, it includes: an N-type transistor output driving circuit and a P-type transistor output driving circuit, wherein the N-type transistor output driving circuit includes: a first N-type transistor N1, a second N-type transistor N2, a third N-type transistor N3 and the fourth N-type transistor N4, the width-to-length ratio of the first N-type transistor N1 and the second N-type transist...

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Abstract

The invention provides an I/O interface driving circuit capable of automatically controlling noise. The I/O interface driving circuit comprises an N-type transistor output driving circuit and a P-type transistor output driving circuit. The output signal and the input signal of an I/O interface are combined to form a combined signal for controlling the N-type transistor output driving circuit and the P-type transistor output driving circuit. Further, the combined signal is used for eliminating level bounce induced by a power end and a ground end when the output signal of the I/O interface is inverted. A first time delay circuit is used for adjusting the driving capability of the N-type transistor output driving circuit. A second time delay circuit is used for adjusting the driving capability of the P-type transistor output driving circuit. Thus, voltage overshoot of the output signal of the I/O interface is prevented; smoothness at the later inverting period of the output signal of the I/O interface is achieved; and the noise suppression capability of the I/O interface is improved.

Description

technical field [0001] The invention relates to the technical field of IC design, in particular to an I / O interface drive circuit for automatic noise control. Background technique [0002] In the design of large-scale digital integrated circuits, due to the high-speed requirements of advanced peripherals such as SRAM on the output signal of the chip, the output signal of the I / O interface of the chip needs to be flipped quickly. Although a simple I / O interface with large drive capability can meet the high-speed changes of the output signal, it will cause too much high-frequency noise in the output signal and produce other adverse effects. For example, the jitter (Bounce) induced on the power line and the ground line will increase the delay of the signal reaching a stable state, and even error messages will appear; crosstalk between output signals will cause false triggers and correct signals to be shielded, etc. Phenomenon. These noises and interferences are often caused b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/0175
Inventor 谢憬程秀兰刘婷付宇卓
Owner 镇江天美信息科技有限公司
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