201132002 六、發明說明： 【發明所屬之技術領域】 本發明係有關於傳送與接收通訊訊號的技術，尤指一種可在收發 裝置操作在接收端模式（RXmode)時，參照其傳送端模組的共模 電壓（c〇mm0n-m〇dev〇itage)來產生其接收端模組的共模電壓之收 ^ 發裝置及收發系統。 【先前技術】 由視讯電子標準協會（Video Electronics Standards Association， VESA)所制定的最新一代介面標準_〇丨叩一卩〇代，不但可以簡化顯 示3又a十及其相關之連接方式，且由於DiSplayp〇rt具備穩健的電器特 性，因此可以支援更高的解析度。雖然目前Displayp〇rt大都是應用 #在筆記型電腦以及顯示螢幕上’亦可將其設計在許多的嵌入式應用 或者内部應用上，例如：數位電視。 每一個應用在DisplayPort的收發裝置均包含有一個接收端以及 一個傳送端，按照DisplayPort的規範所定義，無論是對於來源設備 或者接收a又備而$，其翻轉電壓（加v〇itage，定義成傳送 端之共模電壓與接收端之共模電壓之間的電壓差）皆必須要小於〇 4 伏特。因此，熟知此項技藝者應可了解要維持共模電壓不變是非常 201132002 困難的’舉例來說，假設傳送端的振幅大小改變了’它的共模電壓 也會跟著改變。另外’整個收發系統的總阻抗值也必須要維持在5〇 歐姆上下，所以會將電容值大小為100nF的AC耦合電容設置在兩 個收發裝置之間（例如，來源設備以及接收設備之間）來連接彼此。 右疋该收發裝置從傳送端模式（TXmode)切換成接收端模式（rx mode) B寺’可能需要浪費很多時間來將傳送端的共模電壓轉 收端的共模電壓。 因此，如何解決上述問題，亦是收發裝置的設計領域中的重要考籲 量之一 〇 【發明内容】 一因此’本發明的目的之一在於提出一種可在收發裝置操作在接收 端模式下時，參照其傳送端模組的共模電壓來產生其接收端模组的 共模電壓之收㈣置及收發线，以解決上述之問題。 _ 本發明係揭露-種收發裝置。收發裝置包含一傳送端模組及一接 收端模組。傳送端模址包含有一傳送電路以及一輔助電路。當收發 襄置操作在-傳送端模式下時，傳送會產生一第—差動輸人^ . 2。輔助電路係輕接於該傳送電路，當收發裝置操作在該傳送端‘ 、:了時，輔助電路會根據該第一差動輸入訊號對來產生一差動輸 出訊號對。接收端模組係輕接於該辅助電路，當該收發裝置操作在 6 201132002 -接收端模式τ時，接收職組會根據—共模電縣接收一第二差 動輸人訊號對。其中，補助電路係於魏發裝置操作在該接㈣ 模式下時，產生該共模電壓。 本發明另揭露-種收發系統。收發系統包含有兩收發裝置，該兩 收發裝置係經由-電舰來與彼此進行溝通，且該電雙線接 各自的兩視訊介面之間。該兩收發褒置中的每一收發農置均包含有 _ -傳送端模組及—接收端模組。傳送端模組包含有—傳送電路以及 -輔助電路。當收發裝置操作在—傳送端模式下時，傳送電路會產 生-第-差動輸入訊號對。輔助電路係減於該傳送電路，當收發 裝置操作在該傳送端模式下時，輔助電路會根據該第一差動輸入訊 號對來產生-差動輸出訊號對。接收端模組係搞接於該輔助電路°， 當該收發裝置操作在-接收端模式下時，接收端模組會根據一共模 電壓來接收-第一差動輸入訊號對。其中，該輔助電路係於該收發 裝置#作在該接收端模式下時，產生該共模電屢。於一實施例中， 鲁該些視訊介面係符合一 DisplayP0rt規範。 【實施方式】 在說明書及_㈣請補棚0使用了某些詞彙來指稱特 定的元件所屬摘巾具有通常知識者應可理解，硬雜造商可能 會用不_名詞來射的猶^本_書及後續的申請專利範 圍並不以名稱的差異來作輕分元件的方式，而是以元件在功能上 201132002 的差異來作為區分的準則。在通篇說明書及後續的請求項當中所提 及的「包含」係為一開放式的用語，故應解釋成「包含但不限定於」。 另外，「耦接」一詞在此係包含任何直接及間接的電氣連接手段。因 此，若文中描述一第一裝置耦接於一第二裝置，則代表該第一裝置 可直接電氣連接於該第二裝置，或透過其他衰置或連接手段間接地 電氣連接至該第二裝置。 清參考弟1圖’第1圖為本發明一收發系統1〇的架構之一實施 例的示意圖。於本實施例中，收發系統1 〇係符合DisplayPort規範， 但此並非本發明之限制條件。如第1圖所示，收發系統丨〇包含有一 第一收發裝置110以及一第二收發裝置120，其中第一第一收發裝 置110以及第二收發裝置120係經由一電纜線13〇來與彼此進行溝 通。舉例來說’於本實施例中，第一收發裝置110係作為一來源設 備（source device)，而第二收發裝置120係作為一接收設備（sink device)。值得注意的是’第-收發裝置no以及第二收發裝置12〇 中的任一個收發裝置皆可當作一個輔助設備（auxiliarydevice)，也 就是說’兩者當中的任何一個收發裝置均包含有一傳送端模組（以 元件符號112/122來標示之）' 一接收端模組（以元件符號】14/124 來標示之）以及一視訊介面（例如，一 DisplayPort連接器，以元件 符號116/126來標示之），如第1圖所示。換句話說，當第—收發穿 置110係當作一傳送端時’此時第二收發裝置120係當作一接收端； 反之’當第一收發裝置110係當作一接收端時，此時第二收發裝置 120係當作一傳送端。 201132002 請參考第2圖，第2圖為本發明一收發裝置200的實施範例之一 實施例的示意圖。請注意，第1圖所示之第一收發裝置110以及第 二收發裝置120中的任一個收發裝置皆可利用第2圖所示之收發裝 置200來實現之。如第2圖所示’收發裝置2〇〇的實施範例包含有 (但不侷限於）一傳送端模組21〇、一接收端模組22〇以及一視訊 介面230。傳送端模組21〇包含有一傳送電路25〇以及一輔助電路 240，而接收端模組220則係耦接於傳送端模組21〇之輔助電路 240。當收發裝置2〇〇係操作在一傳送端模式（TXm〇de)下時，此 時傳送電路250會產生一第一差動輸入訊號對 (包含有一第一正輸 入汛號IN1+以及一第一負輸入訊號。而輔助電路·24〇則係耦 接於傳送電路250，當收發裝置200係操作在傳送端模式下時，輔 助電路24G會根據第—差動輸人訊號對IN+、IN·來產生-差動輸出 訊號對（包含有一正輸出訊號〇υτ+以及一負輸出訊號〇υτ_)。另 外，當收發裝置2〇〇係操作在一接收端模式（RXm〇de)下時，此 時接收端模組220會根據一共模電壓VC0M來接收一第二差動輸入 汛唬對。值得注意的是，輔助電路24〇係於收發裝置2〇〇操作在該 接收端模式下時，來產生共模電壓VCOM。關於輔助電路24〇的内 部tl件及其相關運作將於下列實施例中作進一步說明。 透過上述的例子，傳送電路250可視為傳送端模組21〇的第一級 電路（first stage)，而輔助電路24〇則可視為傳送端模組2ι〇的最後 一級電路（laststage)，但此並非本發明之限制條件。請注意，輔助 201132002 ，因此，當收發 可用來產生並提 電路240會另物妾至接收端模組22〇的輸入節勒 裝置200係操作在接收端模式下時，輔助電路細 供想要的共模電壓VC〇M給接收端模組22〇。 第3圖’第3圖為說明第2圖所示之傳送端模組別中的 40之5羊細電路的示意圖。如第3圖所示，輔助電路罵 ^含有（但不侷限於）一差動電路32()以及一控制電路33〇。差動201132002 VI. Description of the Invention: [Technical Field] The present invention relates to a technique for transmitting and receiving communication signals, and more particularly to a method for referring to a transmitting end module when the transceiver operates in a receiving mode (RXmode) The common mode voltage (c〇mm0n-m〇dev〇itage) is used to generate a common mode voltage receiving device and a transceiver system of the receiving end module. [Prior Art] The latest generation interface standard developed by the Video Electronics Standards Association (VESA) not only simplifies the display of 3 and a and its related connection methods, but also Thanks to its robust electrical characteristics, DiSplayp〇rt supports higher resolution. Although DisplayP〇rt is currently used in applications #on notebooks and display screens, it can also be designed for many embedded applications or internal applications, such as digital TV. Each application in DisplayPort's transceivers includes a receiver and a transmitter. According to the DisplayPort specification, whether it is for the source device or receiving a and $, its flip voltage (plus v〇itage, defined as The voltage difference between the common mode voltage at the transmitting end and the common mode voltage at the receiving end must be less than 〇4 volts. Therefore, those skilled in the art should be able to understand that it is very difficult to maintain the common mode voltage unchanged. For example, if the magnitude of the amplitude of the transmitting end is changed, its common mode voltage will also change. In addition, the total impedance of the entire transceiver system must also be maintained at 5 〇 ohms, so an AC coupling capacitor with a capacitance of 100 nF is placed between the two transceivers (for example, between the source device and the receiving device). Come to connect with each other. Right-hand switching of the transceiver from the transmit mode (TXmode) to the receive mode (rx mode) can require a lot of time to transfer the common-mode voltage of the common-mode voltage transfer terminal at the transmit end. Therefore, how to solve the above problem is also one of the important examinations in the design field of the transceiver device. [Invention] Therefore, one of the objects of the present invention is to provide a method for operating the transceiver device in the receiving end mode. The common mode voltage of the transmitting end module is used to generate the receiving (four) setting and receiving and receiving lines of the common mode voltage of the receiving end module to solve the above problem. The invention discloses a transceiver device. The transceiver device comprises a transmitting end module and a receiving end module. The transmitting end template address includes a transmitting circuit and an auxiliary circuit. When the transceiver operation is in the -transport mode, the transmission will generate a first-differential input. The auxiliary circuit is lightly connected to the transmitting circuit. When the transmitting device operates at the transmitting end, the auxiliary circuit generates a differential output signal pair according to the first differential input signal pair. The receiving end module is lightly connected to the auxiliary circuit. When the transceiver device operates in the 6201132002-receiver mode τ, the receiving team receives a second differential input signal pair according to the common mode power county. The auxiliary circuit generates the common mode voltage when the Weifa device operates in the (4) mode. The invention further discloses a transceiver system. The transceiver system includes two transceivers that communicate with each other via an electric ship, and the electrical two wires are connected between the respective two video interfaces. Each of the two transceivers includes a _-transport module and a receiver module. The transmitting end module includes a transmitting circuit and an auxiliary circuit. When the transceiver is operating in the transmit mode, the transmit circuitry generates a -differential input signal pair. The auxiliary circuit is subtracted from the transmitting circuit. When the transceiver operates in the transmitting mode, the auxiliary circuit generates a differential output signal pair according to the first differential input signal pair. The receiving end module is connected to the auxiliary circuit °. When the transceiver device operates in the receiving-receiving mode, the receiving end module receives the first differential input signal pair according to a common mode voltage. The auxiliary circuit generates the common mode power when the transceiver device is in the receiving end mode. In one embodiment, the video interfaces are in accordance with a DisplayP0rt specification. [Embodiment] In the manual and _ (4), please use some vocabulary to refer to the specific component to which the towel has the usual knowledge should be understandable, hard manufacturers may use the _ noun to shoot The scope of the _ book and subsequent patent applications does not use the difference in name as the means of light component, but the difference in the function of function 201132002 as the criterion for differentiation. The word "comprising" as used throughout the specification and subsequent claims is an open term and should be interpreted as "including but not limited to". In addition, the term "coupled" is used herein to include any direct and indirect electrical connection. Therefore, if a first device is coupled to a second device, it means that the first device can be directly electrically connected to the second device or indirectly electrically connected to the second device through other fading or connecting means. . BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing an embodiment of a structure of a transceiver system 1 of the present invention. In the present embodiment, the transceiver system 1 is compliant with the DisplayPort specification, but this is not a limitation of the present invention. As shown in FIG. 1, the transceiver system 丨〇 includes a first transceiver device 110 and a second transceiver device 120, wherein the first first transceiver device 110 and the second transceiver device 120 are connected to each other via a cable 13 Communicate. For example, in the present embodiment, the first transceiver device 110 serves as a source device, and the second transceiver device 120 serves as a sink device. It should be noted that any of the first transceiver device and the second transceiver device 12 can be regarded as an auxiliary device, that is, any one of the transceiver devices includes a transmission device. End module (indicated by component symbol 112/122) 'a receiver module (labeled by component symbol 14/124) and a video interface (eg, a DisplayPort connector with component symbol 116/126) To mark it), as shown in Figure 1. In other words, when the first transmitting and receiving 110 is regarded as a transmitting end, the second transceiver 120 is regarded as a receiving end; otherwise, when the first transceiver 110 is regarded as a receiving end, this The second transceiver 120 is regarded as a transmitting end. 201132002 Please refer to FIG. 2, which is a schematic diagram of an embodiment of a transceiver device 200 according to the present invention. Note that any of the first transceiver device 110 and the second transceiver device 120 shown in Fig. 1 can be realized by the transceiver device 200 shown in Fig. 2. The embodiment of the transceiver device 2 shown in FIG. 2 includes, but is not limited to, a transmitter module 21, a receiver module 22, and a video interface 230. The transmitting end module 21A includes a transmitting circuit 25A and an auxiliary circuit 240, and the receiving end module 220 is coupled to the auxiliary circuit 240 of the transmitting end module 21A. When the transceiver device 2 is operating in a transmitter mode (TXm〇de), the transmitting circuit 250 generates a first differential input signal pair (including a first positive input signal IN1+ and a first The auxiliary circuit 24 is coupled to the transmission circuit 250. When the transceiver 200 is operating in the transmission mode, the auxiliary circuit 24G will respond to the IN+, IN· according to the first differential input signal. Generating a differential output signal pair (including a positive output signal 〇υτ+ and a negative output signal 〇υτ_). In addition, when the transceiver 2 is operating in a receiver mode (RXm〇de), The receiving end module 220 receives a second differential input pair according to a common mode voltage VC0M. It is noted that the auxiliary circuit 24 is generated when the transceiver device 2 is operated in the receiving mode. The common mode voltage VCOM. The internal tl device of the auxiliary circuit 24A and its related operation will be further explained in the following embodiments. Through the above example, the transmission circuit 250 can be regarded as the first stage circuit of the transmitting end module 21 ( First stage), The auxiliary circuit 24〇 can be regarded as the last stage of the transmitting end module 2ι〇, but this is not a limitation of the present invention. Please note that the auxiliary 201132002, therefore, when the transceiver can be used to generate and extract the circuit 240 will be another When the input node device 200 of the receiving end module 22 is operated in the receiving end mode, the auxiliary circuit supplies the desired common mode voltage VC〇M to the receiving end module 22〇. Fig. 3 '3 The figure shows a schematic diagram of a 40-th-thin circuit in the transmitter module shown in Fig. 2. As shown in Fig. 3, the auxiliary circuit includes (but is not limited to) a differential circuit 32 () And a control circuit 33〇. Differential
I 入端、一負輸入端、一正輸出端以及-負輸出 本實施例中，差動電路32〇包含有-第-電阻R卜-第二電 i由贫帛冑曰曰體一第二電晶體Q2以及-偏壓電路340， 、、第一電阻R1具有一第一節點N11麵接於一第一供應電壓娜 之 二及一第二節點N12;同樣地，第二電阻μ亦具有一第一節點腿 =接於第-供應電壓VDD以及—第二節點體。再者，第一電晶 Q1具有第-電極m、一、第二電極si以及—控制電極⑺，其 第電；U D1係作為則述之該負輸出端並搞接至第一電阻則之第 ^點m2 ’而控制電極G1則係作為前述之該正輸人端。第二電 =Q2亦具有-第一電極D2、一第二電極82以及一控制電極G2, 笛=電極D2係作為前述之該正輸出端並麵接至第二電阻Μ之 卽點Ν22，而控制電極〇2則係作為前述之該負輸入端。此外， 壓電路340係轉接於一第二供應電壓gnd以及第一電晶體… 第二電極s卜第二電晶體Q2之第二電極s2之間。 值得注意的是，控制電路330係用來決定要由哪-娜號輸入至 201132002 差動電路32G的正輸入端（亦即，G1)以及負輸人端（亦即，G2)。 於本實施例中’控制電路33〇係可由兩個開關卜來實現之， 但此僅為用來描述本發明可行之實施例，並非本發明之限制條件。 其中第一開關SW1係減至差動電路320的正輸入端（亦即，G1)， 用以選擇要將第-正輸入訊號抓+或者一第一參考電壓Vrefl輸入 至差動電路320的正輸入端G1 ;而第二開關撕2_辆接至差動 電路320的負輸入端（亦即，G2)，用以選擇要將第一負輸入訊號 ❿IN1-或者一第二參考電壓Vrefl輸入至差動電路似的負輸入端 G2。熟知此項技#者應可了解，在不違背本發明之精神的情況下， …採用其他元件來實現控制電路现，此皆應隸屬於本發明所涵 蓋之範圍。 換句話說，當收發裝置2〇〇係操作在該傳送端模式下時，此時控 制電路330係用來將第一差動輸入訊號對（包含有第-正輸入訊號 驗以及第-負輸入訊號跳）輕接至正輸入端⑺以及負輸入端 G2 ’如第4A圖所示；而當收發襄置係操作在該接收端模式下 ^此時控制電路330則係用來將正輸人端G1以及負輸入端Μ /刀別輪接至第-參考電壓Vrefl以及第二參考電壓VreQ，如第牝 圖所示。此外，當收發裝置2〇〇係操作在該接收端模式下時，控制 電路330另將正輸出端（亦即，D2)以及負輸出端（亦即，叫所 =之共模賴Vc〇M傳送至接收端模組22〇。關 的相關細節將進一步地詳細描述如下。 电塔 201132002 請一併參考第4A圖以及第4B圖，第4A圖為顯示當收發裝置 200操作在傳送端模式的情況下時，輔助電路24〇中的差動電路 的示意圖；而第4B圖則為顯示當收發裝置2〇〇操作在接收端模式I input terminal, a negative input terminal, a positive output terminal, and a negative output. In this embodiment, the differential circuit 32 〇 includes a -th-resistance R b - the second electric i is from a lean body to a second The transistor Q2 and the biasing circuit 340, the first resistor R1 has a first node N11 that is connected to a first supply voltage Na and a second node N12; likewise, the second resistor μ also has A first node leg = connected to the first supply voltage VDD and - the second node body. Furthermore, the first transistor Q1 has a first electrode m, a first electrode, a second electrode si, and a control electrode (7), the first electrode thereof; U D1 is used as the negative output terminal and is connected to the first resistor. The first point m2' and the control electrode G1 are used as the aforementioned positive input terminal. The second electric=Q2 also has a first electrode D2, a second electrode 82 and a control electrode G2, and the flute=electrode D2 is connected as the positive output end to the second resistor Μ22, and The control electrode 〇 2 serves as the aforementioned negative input terminal. In addition, the voltage circuit 340 is switched between a second supply voltage gnd and a second electrode s2 between the second electrode s and the second electrode s2 of the second transistor Q2. It is worth noting that the control circuit 330 is used to determine which source to input to the positive input terminal (i.e., G1) and the negative input terminal (i.e., G2) of the differential circuit 32G of 201132002. In the present embodiment, the 'control circuit 33' can be implemented by two switches, but this is only an embodiment for describing the present invention, and is not a limitation of the present invention. The first switch SW1 is reduced to the positive input terminal of the differential circuit 320 (ie, G1) for selecting the positive input signal capture + or a first reference voltage Vref1 to be input to the differential circuit 320. The input terminal G1 is connected to the negative input terminal (ie, G2) of the differential circuit 320 for selecting to input the first negative input signal ❿IN1- or a second reference voltage Vref1 to A differential input terminal G2 like a differential circuit. Those skilled in the art should understand that, without departing from the spirit of the invention, the use of other components to implement the control circuitry is within the scope of the invention. In other words, when the transceiver device 2 is operating in the transmitter mode, the control circuit 330 is configured to use the first differential input signal pair (including the first positive input signal check and the first negative input). The signal jump) is lightly connected to the positive input terminal (7) and the negative input terminal G2' as shown in FIG. 4A; and when the transceiver device is operated in the receiving terminal mode, the control circuit 330 is used to input the user. The terminal G1 and the negative input terminal Μ / knife are connected to the first reference voltage Vref1 and the second reference voltage VreQ as shown in the figure. In addition, when the transceiver device 2 is operating in the receiving end mode, the control circuit 330 further sets the positive output terminal (ie, D2) and the negative output terminal (ie, the common mode VVc〇M It is transmitted to the receiving end module 22. The relevant details of the closing will be further described in detail below. Electric Tower 201132002 Please refer to FIG. 4A and FIG. 4B together, and FIG. 4A shows the operation of the transceiver 200 in the transmitting mode. In the case of a schematic diagram of the differential circuit in the auxiliary circuit 24, and FIG. 4B is a diagram showing the operation of the transceiver device 2 in the receiving mode.
的情況下時’輔助電路320中的差動電路240的示意圖。於第4A 圖中，第一差動輸入訊號對（包含有第一正輸入訊號沉1+以及第一 負輸入訊號IN1-)係耦接至差動電路320的正輸入端G1以及負輸 入端G2;而於第4關中’差動電路32〇的正輸入端⑴以及負輸 入知G2則係分別輕接至第一參考電壓Vren以及第二參考電塵 Vref2 〇 於-實施例中，第一參考電壓Vren係可大致上等於第二參考電 壓W2，但此並非本剌之限.件。舉·說，於本實施例中， 第-參考電壓加fl以及第二參考電壓Vre財的每—參考電壓係可 大致上等於第-供應電壓VDD。因此，在這個例子中，可假設第一 電阻R!以及第二電阻R2的阻抗各為5〇歐姆（〇hms)，如此一來， 當收發裝置係操作在傳送端模式下時，此時傳送端模組21〇在 正輸出端D2以及負輸入端D1之間會存在一共模賴V·，此 時由於辅助電路240的配置係如第示，因 VC〇M，亦可表示為：（_— (1/2物⑽。另-方、面，當收發 裝置施係操作在接收端模式下時，辅料路 田: 共模電壓VC0M給接收端模心〇,而非用來產生—傳^輸出。 當晶體φ以及第二電晶體Q2皆是由所供應之參料壓（亦 P’比'VW)來導通時，此時由正輪出端见以及負輸出端 201132002 D1所產生之共模龍VCqM亦可表示為：（vdd —(丨 與前述之赌輕να)Μ’_。簡言之，由於在傳送賴式中所 採用的傳送端共模電壓（卿，VC〇M，）以及在接收賴式中所採 用的接收端共模電壓（亦即，vc〇M)皆是由同一電路（亦即輔助 電路240)所產生之’因此一翻轉電壓（加⑺-⑽如^，定義 成傳送端模組則之共模電壓VC0M，與接收端模組mo之共模電 壓VCOM之間的電壓差）可大致上維持在零伏特。如此一來，當收 鲁發裝置2〇0係使用於DisplayPort應用之中（例如，第i圖中的收發 系統10)，則此翻轉電壓係可符合DisplayP〇rt規範（亦即，小於 伏特）。 請注意’熟知此項技藝者應可了解’在不違背本發明之精神的情 況下，只要第-參考電壓Vrefl以及第二參考龍Vref2可在接收端 模式下來分別導通第一電晶體Q1以及第二電晶體卩]，關於第一參 考電壓Vrefl、第二參考電壓Vref2之各種變化皆是可行的。 以上所述的實施例僅用來說明本發明之技術特徵，並非用來侷限 本發明之範嘴。由上可知’本發明提供-種收發裝置及其相關之收 發系統。當收發裝置係操作在傳送端模式下時，輔助電路24〇會根 據該第一差動輸入訊號對0Ν1+、ΙΝ1·)來產生差動輸出訊號對 (0UT+、OUT-)，以允許傳送端模組210完成其所指定的功能，其 中該差動輸出訊號對具有一共模電壓VC0M’（例如，等於（VDD —(1/2*1*50)))。另一方面，當收發裝置係操作在接收端模式下 13 201132002 時，輔助電路240則可產生共模電壓vc〇M (例如，等於（vdd — (1/2*1*50)))給接收端模組22〇。因此，藉由利用傳送端模組的 輔助電路240來在傳賴模式下提供傳送端賴賴（vc〇m，）給 傳送端模組’並在接收賴式下鼓-接㈣共模輕（vc〇M) 給接收端模組’可使得翻轉電壓大致上維持在零伏特，以滿足一特 殊通訊規範（例如’ DiSplayPGrt規範）的要求。此外，僅需要增加 -個控制電路330 (包含有兩個開關SW1、SW2)來決定由哪一個 訊號輸入至差動電路320的正輸入端（亦即，G1)以及負輸入端（亦 即，G2)，因此，並不會造成整體製造成本的負擔。 以上所述僅為本發明之較佳實施例，凡依本發明巾請專利範圍 所做之均㈣化與修飾’皆應屬本發明之涵蓋範圍。 【圖式簡單說明】 第1圖為本發明-收發系統的架構之—實施例的示意圖。 第2圖為本發明·-收舰置的實施範例之_實施例的示意圖。 第3圖為制第2顏示之傳送端模組中的獅電路之詳細電路的 示意圖。 第4A _為顯不當收發裳置操作在傳送端模式的情況下時，輔助電 路申的差動電路的示意圖。 第4B圖為顯不當收發裝置操作在接收端模式的情況下時，輔助電 路中的差動電路的示意圖。 14 201132002 【主要元件符號說明】 10 收發系統 110 第一收發裝置 120 第二收發裝置 130 電纜線 112、122、210 傳送端模組 114、124、220 接收端模組 116、126、230 視訊介面 200 收發裝置 250 傳送電路 240 輔助電路 320 差動電路 330 控制電路 340 偏壓電路 R1 第一電阻 R2 第二電阻 Q1 第一電晶體 Q2 第二電晶體 SW1 ' SW2 開關 Nil ' N21 第一節點 N12、N22 第二節點 ί： 15 201132002 D1 ' D2 第一電極 SI ' S2 第二電極 G1 > G2 控制電極 IN1+、INI- 第一差動輪入訊號對 OUT+、OUT- 差動輸出訊號對 Vrefl 第一參考電壓 Vref2 第二參考電壓 VDD 第一供應電壓 GND 第二供應電壓 VCOM、VCOM’ 共模電壓 16In the case of the 'difference circuit 240 in the auxiliary circuit 320. In FIG. 4A, the first differential input signal pair (including the first positive input signal 1+ and the first negative input signal IN1) is coupled to the positive input terminal G1 and the negative input terminal of the differential circuit 320. G2; and in the fourth level, the positive input terminal (1) of the differential circuit 32〇 and the negative input terminal G2 are respectively connected to the first reference voltage Vren and the second reference dust Vref2 respectively, in the embodiment, the first The reference voltage Vren may be substantially equal to the second reference voltage W2, but this is not a limitation. In the present embodiment, the reference voltage of the first reference voltage plus fl and the second reference voltage Vre may be substantially equal to the first supply voltage VDD. Therefore, in this example, it can be assumed that the impedances of the first resistor R! and the second resistor R2 are each 5 ohms (〇hms), so that when the transceiver device operates in the transmitter mode, the transmission is performed at this time. There is a common mode VV· between the positive output terminal D2 and the negative input terminal D1. In this case, since the configuration of the auxiliary circuit 240 is as shown in the figure, it can also be expressed as: — (1/2 object (10). Another side, face, when the transceiver device is operated in the receiving mode, the auxiliary material field: the common mode voltage VC0M is given to the receiving end, instead of being used to generate - pass ^ Output. When the crystal φ and the second transistor Q2 are both turned on by the supplied reference pressure (also P' is higher than 'VW), the total output generated by the positive wheel terminal and the negative output terminal 201132002 D1 at this time. The model dragon VCqM can also be expressed as: (vdd - (丨 前述 前述 轻 ν ν ν _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ And the receiving common mode voltage (ie, vc〇M) used in the receiving Lai is performed by the same circuit (ie, the auxiliary circuit 240). Therefore, the voltage of the flipping voltage (plus (7) - (10) such as ^, defined as the common mode voltage VC0M of the transmitting end module, and the voltage difference between the common mode voltage VCOM of the receiving end module mo) can be substantially maintained at Zero volts. As a result, when the receiving device 2 is used in a DisplayPort application (for example, the transceiver system 10 in FIG. 1), the inversion voltage can conform to the DisplayP〇rt specification (ie, Less than volts. Please note that 'well to the skilled artisan should understand' that the first reference voltage Vrefl and the second reference dragon Vref2 can be turned on in the receiving mode, respectively, without violating the spirit of the present invention. The crystal Q1 and the second transistor 卩] are applicable to various changes of the first reference voltage Vref1 and the second reference voltage Vref2. The embodiments described above are only used to illustrate the technical features of the present invention, and are not intended to be limited. The present invention provides a transceiver device and related transceiver system. When the transceiver device is operating in the transmitting mode, the auxiliary circuit 24 is based on the first differential input. The pair of 0Ν1+, ΙΝ1·) generates a differential output signal pair (0UT+, OUT-) to allow the transmitting end module 210 to perform its designated function, wherein the differential output signal pair has a common mode voltage VC0M' (eg Is equal to (VDD - (1/2 * 1 * 50)). On the other hand, when the transceiver is operating in the receiver mode 13 201132002, the auxiliary circuit 240 can generate the common mode voltage vc 〇 M (for example, Equal to (vdd — (1/2*1*50))) to the receiving end module 22〇. Therefore, by using the auxiliary circuit 240 of the transmitting end module to provide the transmitting end in the pass mode (vc〇 m,) to the transmitter module 'and under the receiving drum - connect (four) common mode light (vc 〇 M) to the receiver module ' can make the flip voltage is maintained at zero volts to meet a special communication specification (eg 'DiSplayPGrt specification' requirements. In addition, it is only necessary to add a control circuit 330 (including two switches SW1, SW2) to determine which signal is input to the positive input terminal (ie, G1) and the negative input terminal of the differential circuit 320 (ie, G2), therefore, does not burden the overall manufacturing costs. The above description is only the preferred embodiment of the present invention, and all the modifications and modifications made by the scope of the invention according to the invention should be within the scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of an embodiment of an architecture of a transmission-transmission system of the present invention. Fig. 2 is a schematic view showing an embodiment of the embodiment of the present invention. Fig. 3 is a schematic diagram showing the detailed circuit of the lion circuit in the transmission end module of the second embodiment. 4A _ is a schematic diagram of the differential circuit of the auxiliary circuit when the transmission and reception operation is performed in the case of the transmission end mode. Fig. 4B is a diagram showing the differential circuit in the auxiliary circuit when the display device is operated in the receiving mode. 14 201132002 [Description of main component symbols] 10 Transceiver system 110 First transceiver device 120 Second transceiver device 130 Cables 112, 122, 210 Transmitter modules 114, 124, 220 Receiver modules 116, 126, 230 Video interface 200 Transceiver 250 Transmitter circuit 240 Auxiliary circuit 320 Differential circuit 330 Control circuit 340 Bias circuit R1 First resistor R2 Second resistor Q1 First transistor Q2 Second transistor SW1 'SW2 Switch Nil ' N21 First node N12, N22 Second node ί: 15 201132002 D1 ' D2 First electrode SI ' S2 Second electrode G1 > G2 Control electrode IN1+, INI- First differential wheel input signal OUT+, OUT- Differential output signal Pair Vrefl First reference Voltage Vref2 Second reference voltage VDD First supply voltage GND Second supply voltage VCOM, VCOM' Common mode voltage 16