CN213817791U

CN213817791U - HDMI optical cable transmitting terminal with high-speed electrical interface

Info

Publication number: CN213817791U
Application number: CN202023349330.1U
Authority: CN
Inventors: 黄召军; 王祚栋; 毛蔚; 白昀
Original assignee: Fei Ang Innovation Technology Nantong Co ltd
Current assignee: Fei Ang Innovation Technology Nantong Co ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-07-27
Anticipated expiration: 2030-12-31

Abstract

The utility model provides an HDMI optical cable transmitting terminal with a high-speed electrical interface, which comprises a plurality of data channels, wherein each data channel is connected with an HDMI box through two high-speed lines; each data channel comprises a pull-up resistor, a magnetic bead and an AC capacitor, wherein the pull-up resistor is connected with the magnetic bead in series and is connected to a 3.3V power supply; the AC capacitor is connected with the light emission driving chip and is used for isolating the common-mode voltage of the light emission driving chip from the common-mode voltage output by the HDMI box; each data channel also comprises a DCDC chip which is used for converting 5V to 3.3V and is used for converting 5V voltage of the HDMI into 3.3V voltage, supplying power to the light emission driving chip and supplying power to the HDMI box through a pull-up resistor and a magnetic bead; the light emission driving chip drives the VCSEL laser, and converts the electric signal sent by the HDMI box into an optical signal to be sent out. The utility model discloses add pull-up resistance and magnetic bead on the PCB of the transmitting terminal of HDMI cable, add AC electric capacity at light emission driver chip's input, make the HDMI box no matter AC output or DC output, all can carry high-speed signal for light emission driver chip.

Description

HDMI optical cable transmitting terminal with high-speed electrical interface

Technical Field

The utility model relates to the field of photoelectric technology, in particular to HDMI optical cable transmitting terminal with high-speed electrical interface.

Background

With the development of display technology, the resolution of the display is increasing. The transmission rate of audio and video data is from hundred megahertz to gigahertz to dozens of gigahertz, and the display transmission system optical copper feeding and discharging becomes the necessity of the development of the display technology under the trend, and the HDMI technology is particularly embodied in the process. The use of HDMI technology has advanced from HDMI2.0 to HDMI2.1, with its single transmission channel also increasing from the highest rate of 6Gbps to 12.5Gbps, so high rates, where it has not been possible to transmit signals over copper wires, currently mainly in the form of optical fibers; in the process of the HDMI upgrade from 2.0 to 2.1, the requirement of the interface form of the input port of the light emitting end is also changed from the single DC mode to the DC and AC compatible mode.

How to improve the flexibility of the chip, and enable a chip to be used in both DC mode and AC mode, is a problem that needs to be solved urgently by chip designers. Furthermore, the increase in data rate of a single channel requires more advanced processes. For chips for civil use, standard CMOS processes are generally preferred to reduce cost, but the more advanced the process, the higher the design and production costs. In a chip in a DC mode, the common-mode voltage of an input power port is high, high-speed devices in a standard CMOS process are all low-voltage devices, generally 1V-1.2V, and when the high-voltage device is applied to the high common-mode voltage, the devices are easily broken down, designers need to spend great efforts to solve the problem, a lot of extra circuits can be added, the area of the chip is increased, and the highest performance which can be achieved by the process can be reduced. For companies with insufficient design capability, a special process with a high price, such as a bBiCMOS process or a BJT process, may be selected to solve the problem, thereby increasing the production cost.

The HDMI2.0 box has low output rate, a single channel is 6Gbps at most, and the pull-up resistor is not arranged in the HDMI2.0 box, so that the 3.3V pull-up resistor is required to be provided by the light emitting end. HDMI2.1 box, protocol requires DC output or AC output; the DC output box can normally work only by connecting a pull-up resistor to the outside; the box of AC output, the inside pull-up resistance that has of box, the outside need not to add pull-up resistance, if the outside connects after pull-up resistance, box output amplitude can reduce.

Therefore, in order to solve the above problems in the prior art, an HDMI cable transmitting terminal having a high-speed electrical interface is required.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an HDMI optical cable transmitting terminal with high-speed electrical interface, the transmitting terminal includes a plurality of data channel, and every data channel connects the HDMI box through two high-speed lines;

each data channel comprises a pull-up resistor, a magnetic bead and an AC capacitor, wherein the pull-up resistor is connected with the magnetic bead in series and is connected to a 3.3V power supply;

the AC capacitor is connected with the light emission driving chip and is used for isolating the common-mode voltage of the light emission driving chip from the common-mode voltage output by the HDMI box;

each data channel also comprises a DCDC chip which is used for converting 5V to 3.3V and is used for converting 5V voltage of the HDMI into 3.3V voltage, supplying power to the light emission driving chip and supplying power to the HDMI box through a pull-up resistor and a magnetic bead;

the light emission driving chip drives the VCSEL laser, and converts an electric signal sent by the HDMI box into an optical signal to be sent out.

Preferably, the pull-up resistor has a resistance value of 100-200 ohms.

Preferably, the magnetic beads are high-frequency magnetic beads with the capability of enhancing and compensating high-frequency signals. Preferably, the capacitance value of the AC capacitor is not less than 0.1 muF. The utility model provides an HDMI optical cable transmitting terminal with high-speed electrical interface, can effectively solve the forward compatibility problem of HDMI transmitting terminal chip; meanwhile, the design difficulty and complexity of the light driving chip of the emitting end are reduced, the process model selection difficulty is reduced, and the chip cost is reduced. The utility model provides a HDMI optical cable transmitting terminal with high-speed electrical interface can compatible HDMI2.0, the electric connection interface of the transmitting terminal of HDMI box of HDMI 2.1. Because HDMI2.0 regulation electric port is DC output, and HDMI2.1 then DC output or AC output all can, the utility model discloses an AC electric capacity's use has reduced the requirement to light emission driver chip common mode voltage, makes the design and the technology lectotype of light emission chip more nimble to can reduce light emission driver chip's design cycle and manufacturing cost.

The utility model provides a HDMI optical cable transmitting terminal with high-speed electrical interface adds pull-up resistance and magnetic bead on the PCB of the transmitting terminal of HDMI cable, adds the AC electric capacity at light emission driver chip's input to make HDMI box output no matter AC output or DC output, all can normally carry high-speed signal for light emission driver chip.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, as claimed.

Drawings

Further objects, functions and advantages of the present invention will become apparent from the following description of embodiments of the present invention, with reference to the accompanying drawings, in which:

fig. 1 schematically shows a block diagram of the HDMI cable transmitter with a high-speed electrical interface according to the present invention.

Detailed Description

The objects and functions of the present invention and methods for accomplishing the same will be apparent by reference to the exemplary embodiments. However, the present invention is not limited to the exemplary embodiments disclosed below; it can be implemented in different forms. The nature of the description is merely to assist those skilled in the relevant art in a comprehensive understanding of the specific details of the invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals denote the same or similar parts, or the same or similar steps.

In order to solve the problem that exists among the prior art, the utility model discloses an add pull-up resistance and magnetic bead on the PCB (integrated circuit board) of the transmitting terminal of HDMI optical cable, add AC electric capacity at light emission driver chip's input to make HDMI box output no matter AC output or DC output, all can normally be carried high-speed signal for light emission driver chip.

As shown in fig. 1, the utility model discloses HDMI cable transmitter with high-speed electrical interface's structural block diagram, according to the utility model discloses an embodiment, a HDMI cable transmitter 110 with high-speed electrical interface, including a plurality of data channel. The present embodiment is exemplary given with respect to channel 1, channel 2, channel 3 and channel 4. Each data channel is connected to the HDMI box 100 by two high-speed lines. The circuit structure of channel 1 is described below, and the circuit structures of channel 2, channel 3 and channel 4 are the same as channel 1, and will not be described in detail later.

According to the utility model discloses an embodiment, every data channel includes pull-up resistance, magnetic bead to and AC electric capacity, pull-up resistance establishes ties the magnetic bead to on arriving the 3.3V power, be used for providing the operating condition of HDMI box 100, make it normally output signal. Each data channel also includes a 5V to 3.3V DCDC chip 107, a light emission driving chip 108, and a VCSEL laser 109.

In this embodiment, the two high-speed lines connected to the HDMI box 100 are connected to the light emission driving chip 108 through an AC capacitor, and are used to isolate the common-mode voltage of the light emission driving chip from the common-mode voltage output by the HDMI box. In the embodiment, one high-speed line is connected with the light emission driving chip 108 through the first AC capacitor 105; another high speed line is connected to the light emission driving chip 108 through a second AC capacitor 106.

According to the embodiment of the present invention, two high speed lines connected to the HDMI box 100, one of which is connected to the 3.3V power supply via the first pull-up resistor 101 connected in series to the first magnetic bead 103; the other is connected to a 3.3V power supply via a second pull-up resistor 102 in series with a second magnetic bead 104.

According to the utility model discloses an embodiment, every data channel still includes 5V changes 3.3V's DCDC chip 107 for convert HDMI's 5V voltage into 3.3V voltage, drive the chip power supply to the emission of light, and supply power to the HDMI box through pull-up resistance and magnetic bead.

According to the utility model discloses an embodiment, light emission driver chip 108 drives VCSEL laser 109, and the signal conversion that sends HDMI box 100 is the light signal and sends away.

The utility model discloses, connect light emission driver chip 108 through AC electric capacity for keep apart the output common mode voltage of HDMI box 100 and the input common mode voltage of light emission driver chip 108, and electric capacity appearance value is not less than 0.1 mu F, and all there is not the influence to the signal more than the low frequency 20MHz, so does not influence HDMI's speed transmission.

The utility model provides a HDMI optical cable transmitting terminal with high-speed electrical interface can compatible HDMI2.0 and HDMI 2.1. For HDMI2.1, because the transmission data rate is high, up to 12.5Gbps, a pull-up resistor is used, the attenuation of high-frequency signals is not compensated, ISI is generated on signals at a light emitting end, and thus the transmitted data has bit errors.

The magnetic beads are connected to the pull-up resistor in series, so that high-frequency signals of the HDMI can be compensated, and signal interference among channels can be reduced.

The resistance value of the pull-up resistor should not be too large, when the pull-up resistor is too large and can lead to high resolution, the output current of the HDMI box is large, the output common mode point can be seriously reduced, so that the output electric signal of the HDMI box is poor, and the resistance value of the pull-up resistor is 100-200 ohms. The magnetic beads are high-frequency magnetic beads with the capability of enhancing and compensating high-frequency signals, and 1 magnetic bead is connected in series on each pull-up resistor so as to enhance the capability of compensating the high-frequency signals. The capacitance value of the AC capacitor must be larger than 0.1 muF, so as to adapt to the low-speed HDMI protocol signal, and the capacitance value of the utility model is not less than 0.1 muF.

The introduction of the AC capacitor of the present invention reduces the requirement of the system for the common mode voltage at the input end of the photoemission driving chip 108; after the AC capacitor is used, the normal work of the light emission driving chip 108 is not influenced no matter how large the HDMI outputs the common-mode voltage, and the process and the circuit structure can be selected more flexibly during chip design.

The utility model provides an HDMI optical cable transmitting terminal with high-speed electrical interface, can effectively solve the forward compatibility problem of HDMI transmitting terminal chip; meanwhile, the design difficulty and complexity of the light driving chip of the emitting end are reduced, the process model selection difficulty is reduced, and the chip cost is reduced.

The utility model provides a HDMI optical cable transmitting terminal with high-speed electrical interface can compatible HDMI2.0, the electric connection interface of the transmitting terminal of HDMI box of HDMI 2.1. Because HDMI2.0 regulation electric port is DC output, and HDMI2.1 then DC output or AC output all can, the utility model discloses an AC electric capacity's use has reduced the requirement to light emission driver chip common mode voltage, makes the design and the technology lectotype of light emission chip more nimble to can reduce light emission driver chip's design cycle and manufacturing cost.

Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

Claims

1. An HDMI optical cable transmitting terminal with a high-speed electrical interface, comprising: the transmitting end comprises a plurality of data channels, and each data channel is connected with the HDMI box through two high-speed lines;

2. The HDMI cable transmitting end of claim 1, wherein the pull-up resistor has a resistance of 100-200 ohms.

3. The HDMI cable transmitter of claim 1, wherein the beads are high frequency beads with enhanced ability to compensate for high frequency signals.

4. The HDMI cable transmitter of claim 1, wherein the AC capacitance has a capacitance value of not less than 0.1 μ F.