Recirculation current in data transmission

Abstract

Embodiments of the present disclosure relate to electronic devices and methods for current recirculation. The electronic device includes a transmission line, a bias resistor, and a DC bias electrical connection. The transmission line is configured to transmit data. The bias resistor is coupled to the transmission line. The DC bias electrical connection is coupled between the bias resistor and a load at a terminal bias voltage. The DC bias electrical connection is configured to provide the terminal bias voltage to the bias resistor in the event of a DC bias current flowing through the transmission line. By utilizing embodiments herein, the electronic device recirculates current during data transmission to conserve power.

Description

Technical Field

[0001] The exemplary embodiments of this disclosure generally relate to current recirculation techniques, and more specifically, to electronic devices and methods for recirculating current in data transmission systems. Background Technology

[0002] In wired data transmission systems, data is typically transmitted from the transmitter to the receiver via a data transmission line. In some cases, the data transmission line needs to be biased to a DC voltage to facilitate data transmission. For example, in a positive transmitter biased logic (PECL) system, the transmission line can be biased to a DC voltage of 5V or 3.3V.

[0003] In conventional methods, the transmission line is typically coupled to a bias resistor, which in turn is coupled to a terminal bias voltage source that provides a terminal DC bias voltage to the bias resistor. The terminal DC bias voltage (terminal bias voltage) is typically lower than the DC bias voltage of the transmission line. For example, the transmission line may be biased at 3.3V, and the terminal bias voltage received at the bias resistor may be 1.3V, allowing current to flow through the bias resistor.

[0004] During operation, the terminal bias voltage source consumes power and generates heat from both the terminal bias voltage source and the bias resistor. Accumulated heat can potentially damage wired data transmission systems typically implemented on a circuit board, causing aging or failure. Improved solutions for data transmission systems are still needed. Summary of the Invention

[0005] Exemplary embodiments of this disclosure provide a solution for an electronic device and a method for recirculating current.

[0006] In a first aspect, an electronic device is provided. The electronic device includes a transmission line, a bias resistor, and a DC bias connection. The transmission line is configured to transmit data. The bias resistor is coupled to the transmission line. The DC bias connection is coupled between the bias resistor and a load at a terminal bias voltage. The DC bias connection is configured to provide a terminal bias voltage to the bias resistor when a DC bias current flows through the transmission line.

[0007] In a second aspect, a method for recirculating current during data transmission is provided. The method includes transmitting data via a transmission line coupled to a bias resistor. The method also includes providing a terminal bias voltage at a load to the bias resistor via a DC bias electrical connection.

[0008] In a third aspect, a method for manufacturing an electronic device is provided. The method includes providing a transmission line configured to transmit data. The method also includes providing a bias resistor coupled to the transmission line. The method further includes providing a DC bias electrical connection coupled between the bias resistor and a load at a terminal bias voltage. The DC bias electrical connection is configured to provide a terminal bias voltage to the bias resistor when a DC bias current flows through the transmission line.

[0009] According to embodiments of this disclosure, the solution provided by embodiments of this disclosure is to save power consumption and reduce heat buildup in wired data transmission systems. Attached Figure Description

[0010] The above and other objects, features, and advantages of the exemplary embodiments disclosed herein will become more readily understood from the following detailed description with reference to the accompanying drawings. In the drawings, several exemplary embodiments disclosed herein will be shown by way of example, not limitation, in which:

[0011] Figure 1 A block diagram of a conventional electronic device is shown;

[0012] Figure 2 A block diagram illustrating an electronic device implementing some example embodiments of the present disclosure is shown;

[0013] Figure 3 A block diagram illustrating an electronic device implementing some example embodiments of the present disclosure is shown;

[0014] Figure 4 A block diagram illustrating an electronic device implementing some example embodiments of the present disclosure is shown;

[0015] Figure 5 It shows Figure 4 Example schematic diagram of impedance matching network in;

[0016] Figure 6 A block diagram illustrating an electronic device implementing some example embodiments of the present disclosure is shown;

[0017] Figure 7 A block diagram illustrating an electronic device implementing some example embodiments of the present disclosure is shown;

[0018] Figure 8 This is a flowchart illustrating a method for recirculating current in a data transmission system according to some example embodiments of the present disclosure; and

[0019] Figure 9 This is a flowchart illustrating a method for manufacturing an electronic device according to some example embodiments of the present disclosure.

[0020] Throughout the accompanying drawings, the same or corresponding reference numerals denote the same or corresponding parts. Detailed Implementation

[0021] The subject matter described herein will now be discussed with reference to several exemplary embodiments. These embodiments are discussed only to enable those skilled in the art to better understand and thus implement the subject matter described herein, and are not intended to imply any limitation on the scope of the subject matter.

[0022] The terms “comprising” or “including” and variations thereof shall be interpreted as open-ended terms meaning “including, but not limited to”. The term “or” shall be interpreted as “and / or” unless the context clearly indicates otherwise. The term “based on” shall be understood as “at least partially based on”. The term “operably” means a function, action, movement, or state that can be realized by operation caused by a user or external agency. The terms “one embodiment” and “embodiment” shall be understood as “at least one embodiment”. The term “another embodiment” shall be understood as “at least one other embodiment”.

[0023] Unless otherwise specified or limited, the terms “installation,” “connection,” “support,” and “coupling,” and their variations, are used extensively and cover both direct and indirect installation, connection, support, and coupling. Furthermore, “connection” and “coupling” are not limited to physical or mechanical connections or couplings. In the following description, the same reference numerals and designations are used to describe the same, similar, or corresponding parts in the drawings. Other explicit and implicit definitions may be included below.

[0024] As mentioned above, conventional methods for providing terminal bias voltages to data transmission lines in a data transmission system require a separate DC terminal bias voltage source. Figure 1 A block diagram of a conventional electronic device 100 is shown. The electronic device 100 includes a data transmitter 10, a data receiver 20, and a pair of differential data transmission lines X2 and X3 coupling the data transmitter 10 to the data receiver 20. Data can be transmitted from the data transmitter 10 to the data receiver 20 via the pair of differential data transmission lines X2 and X3.

[0025] The electronic device 100 also includes a load 30, such as a microcontroller unit (MCU) or other electronic component. In this case, the load 30 may be directly or indirectly coupled to the data receiver 20.

[0026] Electronic device 100 also includes providing voltage V to load 30 OUT The first voltage source 18 allows the load 30 to utilize the provided voltage V. OUT To operate. In one embodiment, the first voltage source 18 may be a DC-DC converter or a low-dropout regulator (LDO). It should be understood that the load 30 may be a set of electronic components supplied with various voltages. Therefore, at least one voltage converter (not shown) may be provided to convert the voltage V from the first voltage source 18 into a DC-DC converter.OUT It converts to various voltages and supplies those voltages to the group of electronic components.

[0027] Electronic device 100 also includes a second voltage source 17 for providing a terminal bias voltage V through a pair of bias resistors 13 and 14. bias For data transmission purposes, data transmission lines X2 and X3 can be biased with a certain DC line voltage, which is typically greater than the terminal bias voltage V. bias The DC line voltage of the transmission line can be provided by the power supply of the data transmitter 10 and / or the data receiver 20. Alternatively, an external DC line voltage can be provided to the DC line voltage of the transmission line independently of the power supply of the data transmitter 10 and / or the data receiver 20.

[0028] As described above, the terminal bias voltage V bias It can be lower than the DC line voltage. For example, data transmitter 10 and data receiver 20 can be operated with voltage Vcc, which is also the DC line voltage, while the terminal bias voltage V... bias It can be Vcc - ΔV, where ΔV can be, for example, 2V. In this way, a current flows constantly through the pair of bias resistors 13 and 14 to the second voltage source 17, causing energy to be dissipated in the bias resistors 13 and 14 and in the second voltage source 17.

[0029] Assuming terminal bias voltage V bias The voltage is 1.3V, and the current flowing through the second voltage source 17 is 14mA. Therefore, the power consumed by the second voltage source 17 is 18.2mW. In other words, 18.2mW of power is wasted and converted into heat.

[0030] In some embodiments, an improved solution for recirculating current in a data transmission system is proposed. The data transmission system couples a bias resistor to a load at a bias voltage, enabling the elimination of a second voltage source 17 or a similar DC terminal bias voltage source from the data transmission system, and allowing the current flowing through the bias resistor to be recirculated on the load side. In this way, the power initially consumed by the second voltage source 17 can be recirculated in the load to save power and reduce heat generated in the data transmission system.

[0031] Figure 2 A block diagram of an electronic device 200 implementing some example embodiments of the present disclosure is shown. The electronic device 200 includes a data transmission system comprising a data transmitter 10, a data receiver 20, and a single-ended data transmission line X1 coupling the data transmitter 10 to the data receiver 20 on a circuit board. Data can be transmitted from the data transmitter 10 to the data receiver 20 via the single-ended data transmission line X1.

[0032] Electronic device 200 also includes load 30, such as a microcontroller unit (MCU) or other electronic component. In this case, load 30 may be directly or indirectly coupled to data receiver 20.

[0033] Electronic device 200 also includes providing voltage V to load 30 OUT The first voltage source 18 allows the load 30 to utilize the provided voltage V. OUT To operate. In one embodiment, the first voltage source 18 may be a DC-DC converter or a low-dropout regulator (LDO). It should be understood that the electronic device 200 may include additional loads supplied with various voltages. Therefore, at least one voltage converter (not shown) may be provided to convert the voltage V from the first voltage source 18 into a voltage V. OUT It converts to various voltages and provides those voltages to other loads.

[0034] Electronic device 200 also includes a DC bias electrical connection to switch the voltage V to a DC bias electrical connection. OUT The node is coupled to bias resistor 12. Although bias resistor 12 is shown, this is for illustrative purposes only and does not imply any limitation on the scope disclosed herein. Other resistive devices may also be applied here.

[0035] In one embodiment, the DC bias electrical connection may include a switch S1. Switch S1 may be controlled by a signal Ctrl from the MCU of the electronics device 200. When signal Ctrl is asserted, switch S1 is turned on to apply voltage V. OUT This serves as the terminal bias voltage supplied to bias resistor 12. When the signal Ctrl is deasserted, switch S1 is opened to supply voltage V. OUT Disconnect from bias resistor 12. The MCU can determine whether a DC bias current flows through single-ended data transmission line X1. If a DC bias current flows through single-ended data transmission line X1, the MCU can set the signal Ctrl to be asserted. If no DC bias current flows through single-ended data transmission line X1, the MCU can set the signal Ctrl to be deasserted.

[0036] With a DC bias current flowing through transmission line X1, the voltage V OUT As the terminal bias voltage V bias Provided to bias resistor 12, and without DC bias current flowing through transmission lines X2 and X3, voltage V OUT The bias resistor is not provided to the bias resistor 12. This prevents current sinking from the first voltage source 18 to the data transmitter 10 and data receiver 20 via the single-ended data transmission line X1, and also reduces energy dissipation. In another embodiment, the bias resistor can be directly coupled to the voltage V.OUT The load is 30.

[0037] As described above, the terminal bias voltage V bias It can be lower than the DC line voltage, but in the embodiment, the terminal bias voltage V bias Greater than 0V. For example, data transmitter 10 and data receiver 20 can operate at a voltage Vcc of 3.3V, which is also the DC line voltage, while the terminal bias voltage V... bias It can be Vcc - ΔV, where ΔV can be, for example, 2V, such that the terminal bias voltage V bias It is 1.3V.

[0038] In one embodiment, the voltage V supplied to the load 30 is... OUT Equal to the required terminal bias voltage V at bias resistor 12 bias Or essentially equal to the terminal bias voltage V required at bias resistor 12. bias Here, the phrase "basically equal to" refers to the voltage V. OUT From the terminal bias voltage V bias 90% to terminal bias voltage V bias In the case of 110% of the case. Alternatively, the expression "substantially equal to" refers to the voltage V. OUT From the terminal bias voltage V bias 95% to terminal bias voltage V bias In 105% of cases.

[0039] Due to voltage V OUT It is essentially equal to the terminal bias voltage V required at bias resistor 12. bias Therefore, bias resistor 12 can be coupled to voltage V. OUT To eliminate nodes Figure 1 The voltage source 17. Thus, an appropriate terminal bias voltage V is provided at the bias resistor 12. bias Used to bias the DC voltage of transmission line X1 without sacrificing Figure 1 The energy is supplied to voltage source 17. Furthermore, since the electronics 200 includes various loads requiring different power supply voltages, an appropriate load can be selected at the terminal bias voltage to couple to the bias resistor. In cases where no bias voltage is available for any load, the electronics may include a voltage converter to convert voltage V... OUT Converted to terminal bias voltage V bias As described below.

[0040] In some embodiments, using, such as Figure 2The improved scheme shown allows current to be recirculated in the data transmission system. The data transmission system couples bias resistor 12 to load 30 at a terminal bias voltage, enabling current to be removed from the data transmission system. Figure 1 The second voltage source 17 can recirculate the current flowing through the bias resistor on the load side. In this way, the power initially consumed by the second voltage source 17 can be recirculated in the load 30 to save power and reduce the heat generated in the data transmission system.

[0041] Figure 3 A block diagram is shown illustrating an electronic device 300 implementing some example embodiments of the present disclosure. Electronic device 300 is similar to electronic device 200, and the same components having the same reference numerals operate in substantially the same manner. Therefore, for the sake of brevity, descriptions of the same parts having the same reference numerals will be omitted herein.

[0042] In one embodiment, data transmitter 10 may be a PECL driver and data receiver 20 may be a PECL receiver. In another embodiment, data transmitter 10 may be a PECL driver and data receiver 20 may be a current-mode logic (CML) receiver. In yet another embodiment, data transmitter 10 may be a low-voltage differential signaling (LVDS) driver and data receiver 20 may be a PECL receiver. Alternatively, other data transmitters and receivers are also possible.

[0043] and Figure 2 Compared to electronic device 200, electronic device 300 uses a pair of differential data transmission lines X2 and X3 instead of single-ended data transmission line X1. Therefore, Figure 3 A pair of bias resistors 13 and 14 are shown in place of the bias resistor 12 of the electronic device 200. Similarly, in the electronic device 300, the pair of bias resistors 13 and 14 are coupled to the load 30 at the terminal bias voltage, such that... Figure 1 The second voltage source 17 can be eliminated from the data transmission system, and the current flowing through the bias resistor can be recirculated on the load side. In this way, the power initially consumed by the second voltage source 17 can be recirculated in the load 30 to save power and reduce the heat generated in the data transmission system.

[0044] Figure 4 A block diagram is shown illustrating an electronic device 400 implementing some example embodiments of the present disclosure. Electronic device 400 is similar to electronic device 300, and the same components having the same reference numerals operate in substantially the same manner. Therefore, for the sake of brevity, descriptions of the same parts having the same reference numerals will be omitted herein.

[0045] and Figure 3Compared to the electronic device 300, the electronic device 400 also includes an impedance matching network 40 between a pair of bias resistors 13 and 14 and the switch S1. The impedance matching network 40 can provide better performance for high-frequency differential communication. Furthermore, the first voltage source 18 generates a voltage V. IN It is greater than the terminal bias voltage V of bias resistors 13 and 14. bias and the voltage V of the load 30 OUT Electronic device 400 also includes a DC-DC voltage converter 50 for converting voltage V... IN Converted to a load voltage of 30V OUT .

[0046] Similarly, in electronic device 400, pairs of bias resistors 13 and 14 are coupled to a load 30 at a terminal bias voltage, enabling the elimination of bias voltage from the data transmission system. Figure 1 The second voltage source 17 can recirculate the current flowing through the bias resistor on the load side. In this way, the power initially consumed by the second voltage source 17 can be recirculated in the load 30 to save power and reduce the heat generated in the data transmission system.

[0047] Figure 5 It shows Figure 4 An example schematic diagram of the impedance matching network 40 is shown below. The impedance matching network 40 includes a pair of ferrite beads L1 and L2 coupled to the pair of bias resistors 13 and 14, respectively. The pair of ferrite beads L1 and L2 are coupled to a decoupling capacitor C1, and a third ferrite bead L3 is coupled to a switch S1. The ferrite beads L1, L2, and L3 are configured with low DC resistance and high AC resistance to ensure the quality of high-frequency differential communication. Other configurations of the impedance matching network 40 are also possible, as long as they ensure the quality of high-frequency differential communication.

[0048] Figure 6 A block diagram is shown illustrating an electronic device 600 implementing some example embodiments of the present disclosure. Electronic device 600 is similar to electronic device 200, and the same components having the same reference numerals operate in substantially the same manner. Therefore, for the sake of brevity, descriptions of the same parts having the same reference numerals will be omitted herein.

[0049] and Figure 2 Compared to electronic device 200, electronic device 600 uses an external voltage source (not shown) to provide an external voltage Vcc. When the external Vcc is suitable for the line voltage of the single-ended data transmission line X1, the voltage Vcc can be directly provided to the single-ended data transmission line X1. Alternatively, when the external Vcc is greater than the line voltage required by the single-ended data transmission line X1, the voltage Vcc can be provided to the single-ended data transmission line X1 via a voltage divider resistor 15.

[0050] The voltage divider resistor 15 and the bias resistor 12 together form the voltage Vcc and the terminal bias voltage V. bias A voltage divider is used between the voltage lines to generate an appropriate voltage at data transmission line X1. Similarly, in electronic device 600, bias resistor 12 is coupled to load 30 with a terminal bias voltage, making it possible to eliminate the bias voltage from the data transmission system. Figure 1 The second voltage source 17 can recirculate the current flowing through the bias resistor 12 on the load side. In this way, the power initially consumed by the second voltage source 17 can be recirculated in the load 30 to save power and reduce the heat generated in the data transmission system.

[0051] Figure 7 Block diagrams illustrating electronic devices implementing some exemplary embodiments of the present disclosure are shown. Electronic device 700 is similar to electronic device 600, and the same components having the same reference numerals operate in substantially the same manner. Therefore, for the sake of brevity, descriptions of the same parts having the same reference numerals will be omitted herein.

[0052] and Figure 6 Compared to electronic device 600, electronic device 700 uses a pair of differential data transmission lines X2 and X3 instead of single-ended data transmission line X1. Therefore, Figure 7 A pair of bias resistors 13 and 14 are shown to replace the bias resistor 12 of the electronic device 600, while Figure 7 A pair of voltage divider resistors 16 and 19 are shown in the diagram to replace the voltage divider resistor 15 of the electronic device 600.

[0053] and Figure 6 Compared to the electronic device 600, the electronic device 700 further includes an impedance matching network 40 between a pair of bias resistors 13 and 14 and the switch S1. The impedance matching network 40 can provide better performance for high-frequency differential communication. Furthermore, the first voltage source 18 generates a voltage V. IN It is greater than the terminal bias voltage V of bias resistors 13 and 14. bias and the voltage V of the load 30 OUT Electronic device 700 also includes a DC-DC voltage converter 50 for converting voltage V... IN Converted to a load voltage of 30V OUT .

[0054] Similarly, in electronic device 700, the pair of bias resistors 13 and 14 are coupled to load 30 at the terminal bias voltage, enabling elimination from the data transmission system. Figure 1The second voltage source 17 is capable of recirculating the current flowing through the bias resistors 13 and 14 on the load side. In this way, the power initially consumed by the second voltage source 17 can be recirculated in the load 30 to save power and reduce the heat generated in the data transmission system.

[0055] Figure 8 This is a flowchart illustrating a method 800 for recirculating current in an electronic device according to some example embodiments of the present disclosure. Figure 8 The electronic device may be electronic device 200, 300, 400, 600, or 700 as described in the embodiments. Therefore, refer to Figures 2-7 The described features can be applied to Figure 8 Method 800.

[0056] In 802, data is transmitted via a transmission line coupled to a bias resistor. In 804, in response to the current flowing through the transmission line, a bias resistor with a terminal bias voltage is provided at the load via a DC bias connection.

[0057] Figure 9 This is a flowchart illustrating a method for manufacturing an electronic device according to some example embodiments of the present disclosure. Figure 9 The electronic device may be electronic device 200, 300, 400, 600, or 700 as described in the embodiments. Therefore, refer to Figures 2-7 The described features can be applied to Figure 9 Method 900.

[0058] In 902, a transmission line configured to transmit data is provided. In 904, a bias resistor coupled to the transmission line is provided. In 906, a switch coupled between the bias resistor and a load at a terminal bias voltage is provided. The switch is configured to be turned on to provide a terminal bias voltage to the bias resistor during data transmission through the transmission line.

[0059] The following sections will list some example implementations of the topics discussed in this article.

[0060] Item 1. An electronic device is provided. The electronic device includes a transmission line, a bias resistor, and a DC bias connection. The transmission line is configured to transmit data. The bias resistor is coupled to the transmission line. The DC bias connection is coupled between the bias resistor and a load at a terminal bias voltage. The DC bias connection is configured to provide a terminal bias voltage to the bias resistor during data transmission through the transmission line.

[0061] Item 2. The electronic device according to Item 1, wherein the DC bias electrical connection includes a switch. The switch is configured to be turned on when a DC bias current flows through the transmission line, and the switch is also configured to be turned off when no DC bias current flows through the transmission line.

[0062] Item 3. The electronic device according to any one of items 1-2, wherein the switch comprises an analog switch.

[0063] Item 4. The electronic device according to any one of items 1-3 further includes an impedance matching network coupled between the switch and the bias resistor.

[0064] Item 5. The electronic device according to any one of items 1-4, wherein the transmission line comprises a pair of differential data transmission lines, the pair of differential data transmission lines comprising a first differential data transmission line and a second differential data transmission line; and the bias resistor comprises a first resistor coupled between the first differential data transmission line and the switch and a second resistor coupled between the second differential data transmission line and the switch.

[0065] Item 6. The electronic device according to any one of items 1-5 further includes a data transmitter; and a data receiver coupled to the data transmitter via the pair of differential data transmission lines.

[0066] Item 7. The electronic device according to any one of items 1-6, wherein the data transmitter includes a positive transmitter coupled logic (PECL) driver or a low voltage differential signaling (LVDS) driver; and the data receiver includes a PECL receiver or a current mode logic (CML) receiver.

[0067] Item 8. The electronic device according to any one of items 1-7 further includes a voltage divider resistor coupled between the power supply and the transmission line.

[0068] Item 9. The electronic device according to any one of items 1-8 further includes: a first voltage divider resistor coupled between the power supply and the first differential data transmission line; and a second voltage divider resistor coupled between the power supply and the second differential data transmission line.

[0069] Item 10. The electronic device according to any one of items 1-9, wherein the terminal bias voltage is greater than 0V.

[0070] Item 11. An electronic device according to any one of items 1-10, wherein the data transmitter and the data receiver are mounted on a circuit board, and the transmission line couples the transmitter to the data receiver on the circuit board.

[0071] Item 12. A method for recirculating current in data transmission is provided. The method includes transmitting data via a transmission line coupled to a bias resistor; and providing a terminal bias voltage of a load to the bias resistor via a DC bias electrical connection.

[0072] Item 13. The method according to Item 12 further includes, in response to transmitting data, activating a switch coupled between a DC bias electrical connection between the resistor and the load to provide a terminal bias voltage to the bias resistor.

[0073] Item 14. A method for manufacturing an electronic device is provided. The method includes: providing a transmission line configured to transmit data; providing a bias resistor coupled to the transmission line; and providing a DC bias electrical connection coupled between the bias resistor and a load at a terminal bias voltage. The DC bias electrical connection is configured to provide a terminal bias voltage to the bias resistor when a DC bias current flows through the transmission line.

[0074] Item 15. The method according to Item 14, wherein providing the DC bias electrical connection includes providing a switch. The switch is configured to be turned on when a DC bias current flows through the transmission line. The switch is also configured to be turned off when no data flows through the transmission line.

[0075] Furthermore, although the operations are described in a specific order, this should not be construed as requiring that these operations be performed in the specific order shown or sequentially, or that all of the shown operations be performed to achieve the desired result. In some cases, multitasking and parallel processing may be advantageous. Similarly, while several specific implementation details are included in the foregoing discussion, these details should not be construed as limiting the scope of this disclosure, but rather as descriptions of features specific to particular embodiments. Certain features described in the context of individual embodiments may also be implemented in combination in a single embodiment. On the other hand, various features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments.

[0076] Although the subject matter has been described using language specific to structural features and / or methodological actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are disclosed as exemplary forms of implementing the claims.

Claims

1. An electronic device, comprising: Transmission lines are configured to transmit data; A bias resistor is coupled to the transmission line; as well as A DC bias connection is coupled between the bias resistor and a load at a terminal bias voltage, the DC bias connection being configured to provide the terminal bias voltage to the bias resistor during data transmission through the transmission line. The DC bias electrical connection includes a switch configured to be turned on when a DC bias current flows through the transmission line, and the switch is also configured to be turned off when no DC bias current flows through the transmission line.

2. The electronic device according to claim 1, wherein the switch comprises an analog switch.

3. The electronic device of claim 1, further comprising an impedance matching network coupled between the switch and the bias resistor.

4. The electronic device according to claim 1, wherein the transmission line comprises a pair of differential data transmission lines, the pair of differential data transmission lines comprising a first differential data transmission line and a second differential data transmission line; and The bias resistor includes a first resistor coupled between the first differential data transmission line and the switch, and a second resistor coupled between the second differential data transmission line and the switch.

5. The electronic device according to claim 4, further comprising: Data transmitter; as well as The data receiver is coupled to the data transmitter via the pair of differential data transmission lines.

6. The electronic device of claim 5, wherein the data transmitter comprises a positive transmitter coupled logic (PECL) driver or a low-voltage differential signaling (LVDS) driver; and The data receiver includes a PECL receiver or a current-mode logic CML receiver.

7. The electronic device of claim 1 further includes a voltage divider resistor coupled between the power supply and the transmission line.

8. The electronic device according to claim 4, further comprising: The first voltage divider resistor is coupled between the power supply and the first differential data transmission line; as well as A second voltage divider resistor is coupled between the power supply and the second differential data transmission line.

9. The electronic device according to claim 1, wherein the terminal bias voltage is greater than 0V.

10. The electronic device of claim 5, wherein the data transmitter and the data receiver are mounted on a circuit board, and the transmission line couples the transmitter to the data receiver on the circuit board.

11. A method for recirculating current in data transmission, comprising: Data is transmitted via a transmission line coupled to a bias resistor; The load terminal bias voltage is provided to the bias resistor via a DC bias electrical connection; as well as In response to the transmission of the data, a switch is turned on in the DC bias electrical connection coupled between the bias resistor and the load to provide the terminal bias voltage to the bias resistor.

12. A method for manufacturing an electronic device, comprising: Provides a transmission line configured to transmit data; Provide a bias resistor coupled to the transmission line; as well as A DC bias electrical connection is provided between the bias resistor and a load at a terminal bias voltage, the DC bias electrical connection being configured to provide the terminal bias voltage to the bias resistor during data transmission through the transmission line; Providing a DC bias electrical connection includes providing a switch configured to turn on when a DC bias current flows through the transmission line, and the switch is also configured to turn off when no DC bias current flows through the transmission line.

Images