Pre-loading device and low voltage differential signal transmitter

A low-voltage differential signal and pre-emphasis technology, applied in the field of data transmission, can solve the problem of high power consumption of LVDS transmitters

Active Publication Date: 2009-03-25
ANALOGIX CHINA SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The present invention aims to provide a pre-emphasis device and a low-voltage differential signal

Method used

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  • Pre-loading device and low voltage differential signal transmitter
  • Pre-loading device and low voltage differential signal transmitter
  • Pre-loading device and low voltage differential signal transmitter

Examples

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Embodiment Construction

[0036] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0037] Figure 7 A pre-emphasis device for a low-voltage differential signal transmitter according to an embodiment of the present invention is shown, including:

[0038] A pre-emphasis pulse signal generating unit 10 configured to generate a pre-emphasis pulse signal DPEM according to a serial data signal received from an external source;

[0039] And the pre-emphasis current output unit 20, which includes:

[0040] A bypass unit 22, which is connected in parallel with the LVDS driver 30, includes a bypass switch K configured to act in response to the pre-emphasis pulse signal, and bypass the additional current applied to the LVDS driver when it acts;

[0041] The additional current unit 24, which includes field effect transistors S4 and S5 forming a channel, the gates of the field effect transistors S4 and S5 are connected to an ...

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PUM

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Abstract

The invention provides a pre-emphasis device and a low-voltage differential signal transmitter. The pre-emphasis device comprises a pre-emphasis pulse signal generating unit configured to generate a pre-emphasis pulse signal according to a serial data signal received from an external source; and a pre-emphasis current output unit including a bypass unit connected with an LVDS driver in parallel and including a bypass switch configured to act in response to the pre-emphasis pulse signal for bypassing an additional current applied to the LVDS driver during action, and an additional current unit including field effect transistors forming a channel, wherein the gates of the field effect transistors are connected with an external control signal and are configured to guide the additional current to the bypass unit and the LVDS driver connected with each other in parallel in response to the control signal. The pre-emphasis device can remarkably lower the power consumption of the pre-emphasis pulse signal generation circuit.

Description

technical field [0001] The invention relates to the field of data transmission, in particular to a pre-emphasis device and a low-voltage differential signal transmitter. Background technique [0002] LVDS (Low Voltage Differential Signaling, low voltage differential signal) transmission support rate is generally above 155Mbps (about 77MHZ). LVDS is a low-swing differential signal technology that enables signals to be transmitted at a rate of several hundred Mbps on differential PCB (printed circuit board) pairs or balanced cables. Its low-voltage amplitude and low-current drive output achieve low noise and low power consumption. [0003] figure 1 Shows a basic LVDS transmission and reception circuit. The receiver is a comparator with an absolute transition threshold level of 50mV. Whether it is a cable or a PCB printed line pair, the transmission line can be designed with a differential impedance of 100 ohms. [0004] figure 2 The timing diagram of the process of conv...

Claims

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Application Information

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IPC IPC(8): H04L25/02H03K19/0185
Inventor 赵伟
Owner ANALOGIX CHINA SEMICON
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