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LVDS receiving circuit with adjustable resistor

A technology of receiving circuit and input resistance, applied in the field of LVDS receiving circuit, can solve the problems of non-adjustable 100Ω input resistance, the chip cannot be adjusted, etc., and achieve the effect of reducing rigid requirements, reducing repeated design, and improving data conversion

Inactive Publication Date: 2010-06-23
BEIJING MXTRONICS CORP +1
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0004] The problem with the traditional LVDS receiving circuit is: the internal is a fixed and non-adjustable 100Ω input resistance. This problem is that when the chip is in use, it cannot be adjusted according to external conditions. For example, when considering the resistance of PCB traces, especially In the case of high speed, the impedance matching function of this input is particularly important

Method used

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  • LVDS receiving circuit with adjustable resistor
  • LVDS receiving circuit with adjustable resistor
  • LVDS receiving circuit with adjustable resistor

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Embodiment Construction

[0029] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0030] Such as figure 1 Shown is a schematic structural diagram of the LVDS receiving circuit with adjustable input resistance of the present invention. It can be seen from the figure that the LVDS receiving circuit with adjustable input resistance includes an ESD protection module composed of a diode and a resistor, and an adjustable matching resistor composed of a selection switch and a resistor. module and a signal conversion module composed of comparators, in which the input current signals I_in+ and I_in- first pass through the ESD protection module, and then are converted into corresponding voltage signals by the adjustable matching resistance module and sent to the lower-level signal conversion module.

[0031] The ESD protection module is composed of diodes D1, D2, D3, D4, D5, D6 and resistors R1, R2, R3, R4, the positive terminal of dio...

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PUM

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Abstract

The invention discloses an LVDS receiving circuit with an adjustable resistor. In the input of a standard LVDS signal, the LVDS receiving circuit is provided with an ESD protection module, an adjustable matching resistor module and a signal conversion module; in a certain input current, the adjustable matching resistor module receives different control signals to select different input resistances to generate a suitable voltage and provide the suitable voltage for a next level recovery comparer; and because of the technology of input resistance adjustability, a receiver can work normally in different input currents by selecting different resistances. The technology can widen the application occasions of an LVDS receiver, and realize the function of impedance matching in the situation of high-speed signal input; the overall circuit is of a symmetric structure, which brings convenience to the design work of a backend territory; and the overall circuit can be used in various systems as an independent functional module.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, in particular to an LVDS receiving circuit with adjustable input resistance. Background technique [0002] With the continuous improvement of the speed of the microprocessor, in some large systems such as wireless communication network systems, the requirements for the data transmission capability of the data conversion chip are constantly increasing. At the same time, with the development of CMOS technology, the working frequency inside the chip is getting higher and higher, so it is necessary to realize high-speed data transmission between chips or external data sources. High-speed data transmission can be effectively carried out by using LVDS format signals, but since the internal processing of the chip can only be the signal data format of CMOS format, it is necessary to use LVDS interface circuit to realize the format conversion between the two. [0003] The data transmission me...

Claims

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Application Information

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IPC IPC(8): G09G5/00
Inventor 赵耀华王宗民孔瀛刘福海周亮管海涛张铁良
Owner BEIJING MXTRONICS CORP
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