WO2017101329A1 - 一种基于ffc排线传输usb信号的方法和系统 - Google Patents

一种基于ffc排线传输usb信号的方法和系统 Download PDF

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WO2017101329A1
WO2017101329A1 PCT/CN2016/088571 CN2016088571W WO2017101329A1 WO 2017101329 A1 WO2017101329 A1 WO 2017101329A1 CN 2016088571 W CN2016088571 W CN 2016088571W WO 2017101329 A1 WO2017101329 A1 WO 2017101329A1
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usb signal
usb
compensator
ffc
level
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PCT/CN2016/088571
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English (en)
French (fr)
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常琪
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乐视控股（北京）有限公司
乐视致新电子科技（天津）有限公司
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Priority to US15/250,804 priority Critical patent/US20170168982A1/en
Publication of WO2017101329A1 publication Critical patent/WO2017101329A1/zh

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
    • G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F2213/0042—Universal serial bus [USB]

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  • the embodiments of the present invention relate to the field of signal transmission technologies, and in particular, to a method and system for transmitting a USB signal based on an FFC cable.
  • a bus is a set of transmission lines that carry information as one or more source components to one or more destination components. In layman's terms, a common connection between multiple components is used to transfer information between components.
  • USB Universal Serial Bus
  • USB is a serial bus standard for connecting computer systems and external devices. It is also a technical specification for input and output interfaces. It is widely used in information communication products such as personal computers and mobile devices. And extended to photographic equipment, digital TV (set-top box), game consoles and other related fields. Since the birth of USB, this interface has been widely used in today's electronic products because of its ease of use, support for hot plugging, and fast speed. It is the most successful I/O interface technology on the PC platform, except In addition to PCs and peripherals, it has become the standard interface for mobile phones, digital cameras, printers and various consumer electronics products.
  • USB specification has evolved over the years from the first generation of USB 1.0 Low Speed, USB 1.1 Full Speed, to the USB 2.0 High Speed standard, with a transfer rate of 480 Mb/s, but considering the bus Protocol overhead, interface performance and other issues, in fact, the optimized transmission speed is only two or thirty MB / s. Due to the development of computer performance and peripheral technology, the demand for high-definition video transmission and large-capacity data storage, the transmission speed of USB2.0 has gradually become a bottleneck. The USB organization officially released the USB 3.0 specification at the end of 2008, and the bus signal rate reached 5Gb/s. The actual data throughput rate can reach 200MB/s or more.
  • the USB signal is usually transmitted by using a flexible flat cable (FFC) cable.
  • FFC flexible flat cable
  • the FFC cable is a new type of data cable that is pressed together with a high-tech automated equipment line using PET insulation and extremely thin tin-plated flat copper wire. It has a soft, random bending fold and thickness.
  • the utility model has the advantages of thinness, small volume, simple connection, convenient disassembly, and easy solution of electromagnetic shielding.
  • the FFC cable can be arbitrarily selected by the number of wires and The spacing makes the connection more convenient, greatly reduces the volume of electronic products, reduces production costs, and improves production efficiency. It is most suitable for data transmission lines between mobile parts and motherboards, between PCB boards and PCB boards, and in miniaturized electrical equipment. Cable use.
  • the FFC cable technical parameters mainly include: the number of conductors N refers to the number of copper conductors in the cable; the spacing P refers to the distance between the centerlines of two adjacent conductors; the margin M refers to the outermost conductor.
  • the distance between the middle, W P*(N+1);
  • the length of the line mouth refers to the average length of the exposed conductor in the longitudinal direction;
  • the total length TL refers to the distance between the two ends of the cable;
  • the thickness of the insertion TT refers to the two lines of the cable.
  • the thickness of the joints mainly include: the number of conductors N refers to the number of copper conductors in the cable; the spacing P refers to the distance between the centerlines of two adjacent conductors; the margin M refers
  • a USB signal is transmitted between a master device (Host) and a slave device (Device) through an FFC cable.
  • the USB signal is attenuated, and the degree of attenuation is related to the length of the FFC cable.
  • the maximum length of the FXP cable transmission USB3.0 signal is usually limited to 500mm. If it is higher than 500mm, the transmission (TX) signal and the reception (RX) signal of USB3.0 are likely to fail. Item, which leads to the inability to implement USB3.0 signal transmission.
  • the embodiment of the present application provides a method and system for transmitting a USB signal based on an FFC cable, which can realize a long-distance transmission USB signal of the FFC cable.
  • the embodiment of the present application provides a method for transmitting a USB signal based on an FFC cable, including:
  • An FFC cable combination is previously set between the master device and the slave device, the FFC cable combination including a plurality of FFC cables, a first-level USB signal compensator and a second-level USB signal connecting the plurality of FFC cables Compensator;
  • the first level USB signal compensator amplifies the USB signal
  • the second level USB signal compensator adjusts the amplified USB signal to meet the slave device requirements.
  • the embodiment of the present application provides a system for transmitting a USB signal based on an FFC cable, including:
  • the FFC cable combination includes a plurality of FFC cables, a first-stage USB signal compensator and a second-stage USB signal compensator that connect the plurality of FFC cables;
  • the first level USB signal compensator when transferring a USB signal between the master device and the slave device
  • the USB signal is amplified
  • the second level USB signal compensator adjusts the amplified USB signal to meet the slave device requirements.
  • the method and system for transmitting a USB signal based on the FFC cable adopts an FFC cable combination, and the FFC cable combination includes a plurality of FFC cables and connects multiple FFC cables.
  • the first-level USB signal compensator and the second-level USB signal compensator compensate the attenuation of the USB signal through the secondary USB signal compensator, thereby realizing the long-distance transmission of the USB signal.
  • FIG. 1 is a schematic view of a FFC cable in the prior art
  • FIG. 2 is a schematic diagram of transmitting a USB signal through an FFC cable in the prior art
  • FIG. 3 is a schematic diagram of transmitting a USB signal through an FFC cable in an embodiment of the present application
  • FIG. 4 is a schematic flow chart of a method for transmitting a USB signal based on an FFC cable in a specific embodiment of the present application.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • FIG. 3 is a schematic diagram of transmitting a USB signal through an FFC cable in an embodiment of the present application.
  • the USB signal is transmitted between the master device and the slave device through the FFC cable.
  • USB 3.0 is transmitted as an example for description.
  • USB 3.0 also known as the SuperSpeed USB bus, it retains the USB 2.0 signal line (D+, D-, Vbus, GND) in order to achieve backward compatibility with USB 2.0 compared to the High Speed USB bus.
  • two pairs of USB 3.0 ultra-high speed differential signals SSTX+, SSTX-, SSRX+, SSRX-
  • SSTX+, SSTX-, SSRX+, SSRX- are added, one set of differential pairs is used to transmit signals, and the other set is to receive signals, thereby achieving full-duplex transmission, ultra-high-speed signals.
  • the transmission rate reaches 5Gb/s, and the 8B/10B encoding mechanism is used.
  • the current reaches 900mA.
  • the SSC read spectrum clock
  • USB 3.0 is the primary problem encountered in system design. Attenuation will reduce the quality of the transmitted signal.
  • the FVC cable transmission USB 3.0 signal must have attenuation, and the degree of attenuation is related to the length of the FFC cable. In practical applications, the maximum length of the USB3.0 signal transmitted by the FFC cable is usually limited to 500mm.
  • ReDriver also known as the Repeater IC regenerates the signal and adds signal quality to the high-speed interface.
  • High-speed signal frequencies result in reduced design margins and increase the difficulty of designing durable, high-performance systems.
  • a single ReDriver can adjust and correct the loss of the channel on the transmitting end and restore the signal integrity at the receiving end.
  • the signal conditioning provided by ReDriver is transparent to the communication channel. It does not decode the data or evaluate the protocol commands, but restores the integrity of the original signal.
  • ReDriver parameters are based on The channel characterization is chosen to work independently of the rest of the system. For optimum performance, the ReDriver's inputs and outputs are characterized to match the actual channel they are placed in. Ideally, the high-speed interface should be designed as a closed channel or a restricted open channel. ReDriver placement needs to consider the entire architecture of the system. For example, for many small size devices, the midpoint of the loss may be in the middle of the additional cable. In this case, place the ReDriver as close as possible to the connector for the best signal conditioning.
  • the present application proposes a scheme for realizing long-distance transmission of USB 3.0 signals based on FFC cable using ReDriver.
  • Attenuation compensates.
  • the system for transmitting a USB signal based on the FFC cable in the embodiment of the present application includes: a master device, a slave device, and an FFC cable combination connecting the master device and the slave device, where
  • the FFC cable combination includes a plurality of FFC cables, a first-stage USB ReDriver IC that connects the plurality of FFC cables, and a second-level USB ReDriver IC;
  • the transmission impedance of the FFC cable is adjusted so that the impedance of each FFC cable is controlled to be 90 ⁇ ⁇ 15 ⁇ .
  • the first level USB ReDriver IC amplifies the USB signal
  • the second level USB ReDriver IC adjusts the amplified USB signal to meet the slave device requirements
  • the equalization, pre-emphasis and de-emphasis of the second-level USB ReDriver IC are adjusted, and the amplified USB signal is adjusted to meet the requirements of the slave device.
  • the system for transmitting USB signals based on the FFC cable provided by the embodiment of the present application compensates for the attenuation of the USB signal by using the second-level USB ReDriver IC, thereby realizing the long-distance transmission of the USB signal.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • FIG. 4 is a schematic flow chart of a method for transmitting a USB signal based on an FFC cable in a specific embodiment of the present application.
  • the method includes:
  • Step S51 pre-setting an FFC cable combination between the master device and the slave device, the FFC cable combination comprising a plurality of FFC cables, a first-stage USB signal compensator connecting the plurality of FFC cables, and a second Level USB signal compensator;
  • Step S52 when the USB signal is transmitted between the master device and the slave device, the first level USB signal compensator amplifies the USB signal, and the second level USB signal compensator adjusts the amplified USB signal to satisfy the slave device. Claim.
  • the first level USB signal compensator and the second level USB signal compensator both use a USB ReDriver IC.
  • the step of amplifying the USB signal by the first-level USB signal compensator includes: adjusting equalization, pre-emphasis, and de-emphasis of the first-stage USB signal compensator for performing USB Amplification of the signal;
  • Equalization refers to the equalization of channel characteristics, that is, the equalizer at the receiving end produces characteristics opposite to the channel, which is used to cancel the inter-symbol interference caused by the time-varying multipath propagation characteristics of the channel.
  • the equalization technique used in the embodiment of the present application is a Continuous Timing Linear Equalizer (CTLE), which performs gain compensation on the high frequency portion, suppresses low frequency gain, and compensates for link loss. After processing, the signal-to-noise ratio will increase, thereby reducing the bit error rate at the receiving end.
  • CTLE Continuous Timing Linear Equalizer
  • Pre-emphasis means that the high-frequency component of the analog signal is appropriately boosted before the signal is transmitted. After the signal is received, the signal is inversely processed, that is, de-emphasis, and the high-frequency component is appropriately attenuated. Pre-emphasis and de-emphasis techniques can reduce the effects of high frequency losses on the signal during transmission.
  • the step of adjusting the amplified USB signal by the second-level USB signal compensator to meet the device requirements includes: adjusting the equalization, pre-emphasis and de-emphasis of the second-level USB signal compensator, and adjusting the amplified USB signal to meet the requirements. From the device requirements.
  • the transmission impedance of the FFC cable is adjusted so that the FFC cable impedance is controlled to be 90 ⁇ ⁇ 15 ⁇ .
  • the embodiment of the present application adopts an FFC cable combination based on a method for transmitting a USB signal by using an FFC cable, and the FFC cable combination includes a plurality of FFC cables and a first-level USB signal connecting the plurality of FFC cables.
  • the compensator and the second-stage USB signal compensator compensate the attenuation of the USB signal through the secondary USB signal compensator, thereby realizing the long-distance transmission of the USB signal.

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Abstract

一种基于FFC排线传输USB信号的方法和系统，包括：预先在主设备和从设备之间设置FFC排线组合，所述FFC排线组合包括多个FFC排线、将多个FFC排线连接起来的第一级USB信号补偿器和第二级USB信号补偿器；当主设备和从设备之间传输USB信号时，所述第一级USB信号补偿器将USB信号进行放大，所述第二级USB信号补偿器将放大后的USB信号调整到满足从设备要求。该方法和系统实现了FFC排线长距离的传输USB信号。

Description

一种基于FFC排线传输USB信号的方法和系统
本申请要求于2015年12月14日提交中国专利局、申请号为2015109439663，发明名称为“一种基于FFC排线传输USB信号的方法和系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及信号传输技术领域，尤其涉及一种基于FFC排线传输USB信号的方法和系统。
背景技术
总线是将信息以一个或多个源部件传送到一个或多个目的部件的一组传输线。通俗的说，就是多个部件间的公共连线，用于在各个部件之间传输信息。
通用串行总线(USB，Universal Serial Bus)是连接计算机系统与外部设备的一种串口总线标准，也是一种输入输出接口的技术规范，被广泛地应用于个人电脑和移动设备等信息通讯产品，并扩展至摄影器材、数字电视(机顶盒)、游戏机等其它相关领域。自从USB诞生起，这种接口因为其简单易用、支持热插拔、速度快等特点而被广泛应用于当今的电子产品中，堪称是PC平台上最成功的I/O接口技术，除了PC及外设外，也成为手机、数码相机、打印机及各种消费电子产品标配的接口。
USB规范历经多年的发展从第一代的USB 1.0低速(Low Speed)、USB 1.1全速(Full Speed)，演进到USB 2.0高速(High Speed)标准，传输速率达到480Mb/s，但考虑到总线的协议开销、接口性能等问题，实际上优化的传输速度最高也只有二三十MB/s。由于计算机性能及外设技术的发展，高清视频传输以及大容量数据存储的需求，USB2.0的传输速度逐渐成为瓶颈，USB组织在2008年底正式发布了USB 3.0规范，总线信号速率达到5Gb/s，实际的数据吞吐速率可达200MB/s以上。
目前，电视的USB接口设计中，USB信号通常采用柔性扁平线缆(FFC，Flexible Flat Cable)排线进行的传输。如图1所示，FFC排线是一种用PET绝缘材料和极薄的镀锡扁平铜线，通过高科技自动化设备生产线压合而成的新型数据线缆，具有柔软、随意弯曲折叠、厚度薄、体积小、连接简单、拆卸方便、易解决电磁屏蔽等优点。此外，FFC排线可以任意选择导线数目及 间距，使连线更方便，大大减少电子产品的体积，减少生产成本，提高生产效率，最适合于移动部件与主板之间、PCB板对PCB板之间、小型化电器设备中作数据传输线缆之用。
FFC排线技术参数主要包括：导体数N，是指排线中铜线导体的数目；间距P，是指相邻两条导体中心线之间的距离；边距M，是指最外部一条导体中心线到排线边缘之间的距离；全间距TP，是指最外部两条导体中心线之间的距离，TP＝P*(N-1)；总宽度W，是指排线两个边缘中间的距离，W＝P*(N+1)；线口长度，是指露出的导体在纵向的平均长度；总长度TL，是指排线两端的距离；插入厚度TT，是指排线两个连接端的厚度。
现有技术中，如图2所示，主设备(Host)和从设备(Device)之间通过FFC排线传输USB信号。但是，在通过FFC排线传输USB信号的过程中，USB信号会存在衰减，而且衰减程度与FFC排线长度有关系。
例如，在实际应用中，FFC排线传输USB3.0信号的最大长度通常局限在500mm，如果高于500mm的话，USB3.0的发送(TX)信号和接收(RX)信号很可能会出现信号失败项，从而导致无法实现USB3.0的信号传输。
发明内容
本申请实施例提供一种基于FFC排线传输USB信号的方法和系统，能够实现FFC排线长距离的传输USB信号。
本申请实施例提供一种基于FFC排线传输USB信号的方法，包括：
预先在主设备和从设备之间设置FFC排线组合，所述FFC排线组合包括多个FFC排线、将多个FFC排线连接起来的第一级USB信号补偿器和第二级USB信号补偿器；
当主设备和从设备之间传输USB信号时，所述第一级USB信号补偿器将USB信号进行放大，所述第二级USB信号补偿器将放大后的USB信号调整到满足从设备要求。
本申请实施例提供一种基于FFC排线传输USB信号的系统，包括：
主设备、从设备、以及连接主设备和从设备的FFC排线组合；
所述FFC排线组合包括多个FFC排线、将多个FFC排线连接起来的第一级USB信号补偿器和第二级USB信号补偿器；
当主设备和从设备之间传输USB信号时，所述第一级USB信号补偿器 将USB信号进行放大，所述第二级USB信号补偿器将放大后的USB信号调整到满足从设备要求。
和现有技术相比，本申请实施例提供的基于FFC排线传输USB信号的方法和系统，采用FFC排线组合，该FFC排线组合包括多个FFC排线、将多个FFC排线连接起来的第一级USB信号补偿器和第二级USB信号补偿器，通过二级USB信号补偿器对USB信号的衰减进行补偿，实现了长距离传输USB信号。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为现有技术中FFC排线的示意图；
图2为现有技术中通过FFC排线传输USB信号的示意图；
图3为本申请的一个具体实施例中通过FFC排线传输USB信号的示意图；
图4本申请的一个具体实施例中基于FFC排线传输USB信号的方法的流程示意图。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
实施例一：
图3为本申请的一个具体实施例中通过FFC排线传输USB信号的示意图。
如图3所示，主设备(Host)和从设备(Device)之间通过FFC排线传输USB信号。
在本申请的具体实施例中，以传输USB3.0信号为例进行说明。USB 3.0 又称为SuperSpeed USB总线，与高速(High Speed)USB总线相比，为了做到对USB2.0的向下兼容，它保留了USB2.0信号线(D+，D-，Vbus，GND)，在此基础上增加了两对USB 3.0超高速差分信号(SSTX+，SSTX-，SSRX+，SSRX-)，一组差分对用来发射信号，另一组接收信号，从而实现全双工传输，超高速信号传输速率达到5Gb/s，采用8B/10B编码机制，电流最大达到900mA，为了降低EMI，增加了SSC(扩频时钟)功能。
USB 3.0作为一种高速传输接口，信号完整性是系统设计遇到的首要问题，衰减会降低传输信号的质量。而FFC排线传输USB 3.0信号必然存在衰减，而且衰减程度与FFC排线长度有关系，在实际应用中，FFC排线传输USB3.0信号的最大长度通常局限在500mm。
用户在布置电视和显示器等电子产品时，为了充分利用空间，有时需要进行长距离的传输，这时信号完整性尤其重要。消费者希望能够如自己希望的那样使用设备，例如假设用户想要通过线缆将手机连接到电视，线缆至少需要有两米长，才能使连接到电视背后，不至于使用户离屏幕太近而感到不舒适。在实际生活中，消费者有时不会参考接口规范，他们买回线缆是希望它能工作，这样，他们买到的线缆可能比系统指定的更长，或者是使用质量较差、屏蔽不好的线缆。
随着便携设备新应用的增加，对较长和较便宜线缆提供支持的需求将会与日俱增。虽然这些应用可能最终会采用无线通信，但是现在还没到这个时候。例如，在大多数消费者都有可传送视频流的便携设备时，仅有少数电视提供无线连接。因此，保证线缆的信号完整性对消费者来说将是一个重要特性。
采用ReDriver延伸长度的有源线缆在市场上正不断增加。ReDriver也称为讯号中继器(Repeater IC)，可以重新产生讯号，在高速接口上增加讯号质量。高速的讯号频率造成设计上可用的宽裕度降低，增加设计耐用、高性能系统的难度。透过使用同等化(equalization)、预强调(pre-emphasis)等技术，可让单一ReDriver调整与矫正传输端上频道的损失，并在接收端上恢复讯号完整性。
ReDriver提供的信号调理对通信信道是透明的。它不会对数据进行解码或对协议命令进行评估，而是恢复最初信号的完整性。ReDriver的参数根据 通道表征选取，它将独立于系统的其余部分工作。为了实现最佳性能，ReDriver的输入和输出都要进行表征，以匹配其所放入的实际通道，理想情况下，高速接口应设计成闭合通道或受限制的开放通道。ReDriver放置需要考虑系统的整个架构。例如，对于许多小尺寸设备，损耗的中点可能在附加线缆的中间位置。在这种情况下，将ReDriver放在离连接器尽可能近的位置，可以实现最好的信号调理。
因此，本申请提出了一种基于FFC排线采用ReDriver实现长距离传输USB3.0信号的方案。
相对于现有技术，在本申请的具体实施例中，在主设备和从设备之间至少增加两级补偿器，该补偿器可以采用USB ReDriver IC，对FFC排线中USB3.0信号产生的衰减进行补偿。
如图3所示，本申请实施例的基于FFC排线传输USB信号的系统包括：主设备、从设备、以及连接主设备和从设备的FFC排线组合，其中，
该FFC排线组合包括多个FFC排线、将多个FFC排线连接起来的第一级USB ReDriver IC和第二级USB ReDriver IC；
具体地，调整FFC排线的传输阻抗，使每一个FFC排线阻抗控制在90Ω±15Ω。
第一级USB ReDriver IC将USB信号进行放大；
具体地，调整该第一级USB ReDriver IC的均衡(Equalization)、预加重(Pre-emphasis)和去加重(De-emphasis)，进行USB信号的放大处理；
第二级USB ReDriver IC将放大后的USB信号调整到满足从设备要求；
具体地，调整该第二级USB ReDriver IC的均衡、预加重和去加重，将放大后的USB信号调整到满足从设备要求。
由此本申请的实施例提供的基于FFC排线传输USB信号的系统，采用二级USB ReDriver IC对USB信号的衰减进行补偿，实现了长距离传输USB信号。
实施例二：
图4本申请的一个具体实施例中基于FFC排线传输USB信号的方法的流程示意图。
如图4所示，该方法包括：
步骤S51，预先在主设备和从设备之间设置FFC排线组合，所述FFC排线组合包括多个FFC排线、将多个FFC排线连接起来的第一级USB信号补偿器和第二级USB信号补偿器；
步骤S52，当主设备和从设备之间传输USB信号时，所述第一级USB信号补偿器将USB信号进行放大，所述第二级USB信号补偿器将放大后的USB信号调整到满足从设备要求。
具体地，
所述第一级USB信号补偿器和第二级USB信号补偿器均采用USB ReDriver IC。
所述第一级USB信号补偿器将USB信号进行放大的步骤包括：调整第一级USB信号补偿器的均衡(Equalization)、预加重(Pre-emphasis)和去加重(De-emphasis)，进行USB信号的放大处理；
均衡是指对信道特性的均衡，即接收端的均衡器产生与信道相反的特性，用来抵消信道的时变多径传播特性引起的码间干扰。本申请的实施例中采用的均衡技术是连续时间线性均衡器(CTLE，Continuous Timing Linear Equalizer)，该连续时间线性均衡器将高频部分进行增益补偿，抑制低频增益，对链路损耗进行补偿，处理后信噪比将提升，从而降低接收端的误码率。
预加重是指在信号发送之前，先对模拟信号的高频分量进行适当的提升，在收到信号之后，再对信号进行逆处理，即去加重，对高频分量进行适当的衰减，这种预加重与去加重技术可以使信号在传输中高频损耗的影响降低。
所述第二级USB信号补偿器将放大后的USB信号调整到满足设备要求的步骤包括：调整第二级USB信号补偿器的均衡、预加重和去加重，将放大后的USB信号调整到满足从设备要求。
在本申请的具体实施例中，调整FFC排线的传输阻抗，使其FFC排线阻抗控制在90Ω±15Ω。
由此，本申请的实施例基于FFC排线传输USB信号的方法，采用FFC排线组合，该FFC排线组合包括多个FFC排线、将多个FFC排线连接起来的第一级USB信号补偿器和第二级USB信号补偿器，通过二级USB信号补偿器对USB信号的衰减进行补偿，实现了长距离传输USB信号。
最后应说明的是：以上实施例仅用以说明本申请的技术方案，而非对其 限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的精神和范围。

Claims (10)

  1. 一种基于FFC排线传输USB信号的方法，其特征在于，包括：
    预先在主设备和从设备之间设置FFC排线组合，所述FFC排线组合包括多个FFC排线、将多个FFC排线连接起来的第一级USB信号补偿器和第二级USB信号补偿器；
    当主设备和从设备之间传输USB信号时，所述第一级USB信号补偿器将USB信号进行放大，所述第二级USB信号补偿器将放大后的USB信号调整到满足从设备要求。
  2. 根据权利要求1所述的基于FFC排线传输USB信号的方法，其特征在于，所述第一级USB信号补偿器和第二级USB信号补偿器均采用USB ReDriver IC。
  3. 根据权利要求1所述的基于FFC排线传输USB信号的方法，其特征在于，所述FFC排线的阻抗控制在90Ω±15Ω。
  4. 根据权利要求1所述的基于FFC排线传输USB信号的方法，其特征在于，所述第一级USB信号补偿器将USB信号进行放大的步骤包括：
    调整所述第一级USB信号补偿器的均衡、预加重和去加重，进行USB信号的放大处理；其中，
    所述均衡为采用连续时间线性均衡器将USB信号的高频部分进行增益补偿，抑制低频增益，对链路损耗进行补偿；
    所述预加重为对输入的USB信号高频分量的提升；
    所述去加重为解调后对USB信号高频分量的压低。
  5. 根据权利要求4所述的基于FFC排线传输USB信号的方法，其特征在于，所述第二级USB信号补偿器将放大后的USB信号调整到满足从设备要求的步骤包括：
    调整所述第二级USB信号补偿器的均衡、预加重和去加重，将放大后的USB信号调整到满足从设备要求。
  6. 一种基于FFC排线传输USB信号的系统，其特征在于，包括：
    主设备、从设备、以及连接主设备和从设备的FFC排线组合；
    所述FFC排线组合包括多个FFC排线、将多个FFC排线连接起来的第一级USB ReDriver IC和第二级USB ReDriver IC；
    当主设备和从设备之间传输USB信号时，所述第一级USB信号补偿器将USB信号进行放大，所述第二级USB信号补偿器将放大后的USB信号调整到满足从设备要求。
  7. 根据权利要求6所述的基于FFC排线传输USB信号的系统，其特征在于，所述第一级USB信号补偿器和第二级USB信号补偿器均采用USB ReDriver IC。
  8. 根据权利要求6所述的基于FFC排线传输USB信号的系统，其特征在于，所述FFC排线的阻抗控制在90Ω±15Ω。
  9. 根据权利要求6所述的基于FFC排线传输USB信号的系统，其特征在于，所述第一级USB信号补偿器，具体设置为：
    调整所述第一级USB信号补偿器的均衡、预加重和去加重，进行USB信号的放大处理；其中，
    所述均衡为采用连续时间线性均衡器将USB信号的高频部分进行增益补偿，抑制低频增益，对链路损耗进行补偿；
    所述预加重为对输入的USB信号高频分量的提升；
    所述去加重为解调后对USB信号高频分量的压低。
  10. 根据权利要求9所述的基于FFC排线传输USB信号的系统，其特征在于，所述第二级USB信号补偿器，具体设置为：
    调整所述第二级USB信号补偿器的均衡、预加重和去加重，将放大后的USB信号调整到满足从设备要求。
PCT/CN2016/088571 2015-12-14 2016-07-05 一种基于ffc排线传输usb信号的方法和系统 WO2017101329A1 (zh)

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