A lvds receiving circuit with adjustable input resistance

A technology of receiving circuit and input resistance, which is applied in the field of LVDS receiving circuit, can solve the problems of unadjustable chip and unadjustable 100Ω input resistance, etc., and achieve the effect of reducing rigid requirements, reducing repeated design, and reducing offset error

Inactive Publication Date: 2011-12-14
BEIJING MXTRONICS CORP +1
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  • Abstract
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  • Claims
  • Application Information

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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, so the problem is that when the chip is in use, it cannot be adjusted according to the external conditions. Make corresponding adjustments, such as when PCB trace resistance is to be considered, especially at high speeds, the impedance matching function of this input is particularly important

Method used

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  • A lvds receiving circuit with adjustable input resistance
  • A lvds receiving circuit with adjustable input resistance
  • A lvds receiving circuit with adjustable input resistance

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0031] 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.

[0032] The ESD protection module is composed of diodes D1, D2, D3, D4, D5, D6 and resistors R1, R2, R3, R4, the positive terminal of di...

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Abstract

The invention relates to a LVDS receiving circuit with adjustable input resistance. Under the standard LVDS signal input, the LVDS receiving circuit is equipped with an ESD protection module, an adjustable matching resistance module and a signal conversion module. Under the input current, by receiving different control signals and selecting different input resistances to generate a suitable voltage for the next recovery comparator, due to the adjustable input resistance technology, by selecting different resistances, the receiver can be used in different input work normally under current. This technology can not only expand the application occasions of LVDS receivers, but also realize the function of impedance matching in the case of high-speed signal input. The structure of the whole circuit is symmetrical, which facilitates the design of the back-end layout. The whole circuit can be regarded as a Independent functional modules are used in various systems.

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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Patent Type & Authority Patents(China)
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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