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Differential signaling driver

A differential signal and driver technology, applied in the direction of instruments, pulse technology, control/regulation systems, etc., can solve problems such as the instability of the common-mode feedback loop circuit and the decrease in the operating speed of the differential signal circuit

Active Publication Date: 2013-11-13
VIA TECH INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage of this design is that the common-mode feedback loop can easily cause circuit instability or slow down the operation of differential signal circuits.

Method used

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  • Differential signaling driver
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Embodiment Construction

[0057] In order to make the purpose, features and advantages of the present invention more comprehensible, specific embodiments of the present invention are listed below and described in detail with accompanying drawings.

[0058] figure 1 It is a schematic diagram showing a differential signal driver (Differential Signaling Driver) 100 according to an embodiment of the present invention. In a preferred embodiment, the differential signal driver 100 can support a mobile industry processor interface (Mobile Industry Processor Interface, MIPI) specification, and can be applied to a mobile device, such as: a smart phone (SmartPhone), a tablet computer (TabletComputer), Or a notebook computer (NotebookComputer). The mobile industry processor interface standard usually requires very low voltage, for example, when an output voltage is maintained between 0.1V and 0.3V, a common mode voltage is about 0.2V. Such as figure 1As shown, the differential signal driver 100 includes: a cur...

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Abstract

A differential signaling driver includes a current source which is connected between an operational potential and a first node and supplies a drive current to the first node, a differential signaling generator which is connected between the first node and a second node and receives a digital input signal and generates a pair of differential output signals at a first output node and a second output node based on the digital input signal, and a first resistor which is connected between the second node and a ground potential. The differential signal generator couples the first output node to the operational potential and couples the second output node to the ground potential, or couples the first output node to the ground potential and couples the second output node to the operational potential based on the digital input signal.

Description

technical field [0001] The invention relates to a differential signal driver (Differential Signaling Driver), in particular to a differential signal driver capable of generating stable and precise differential output signals. Background technique [0002] In recent years, differential signal circuits are widely used in the field of data transmission, including: Low Voltage Differential Signaling (Low Voltage Differential Signaling, LVDS), High Definition Multimedia Interface (High Definition Multimedia Interface, HDMI), and Universal Serial Bus (Universal Serial Bus, USB), etc. . The differential signal circuit has the advantages of saving power consumption and blocking noise. However, differential signal circuits usually face the problem of common mode noise (CommonModeNoise). Since a common mode node (CommonModeNode) between the differential output nodes of the differential signal circuit is usually floating (Float), a common mode potential of the differential signal cir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCH03K17/16H03K19/018528H04L25/0272
Inventor 李永胜
Owner VIA TECH INC