Bidirectional signal driving enhancement circuit and method

Abstract

The invention relates to the technical field of driving circuits, in particular to a bidirectional signal driving enhancement circuit, which comprises a bidirectional digital signal transmission line, a signal processing circuit and a signal processing circuit, the first-stage inverter is connected to one end of the bidirectional digital signal transmission line; the second-stage phase inverter is connected to the output end of the first-stage phase inverter; the small-resistance-value protection resistor is connected to the input end of the second-stage phase inverter; when the circuit is converted from a low level to a high level, a pull-up resistor at a signal output end performs conversion process protection, and the circuit and the method for enhancing bidirectional signal driving can be used for enhancing the stability of bidirectional signal transmission, are also suitable for unidirectional signal transmission with simpler conditions, and can avoid digital signal errors at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of driving circuits, and in particular to a circuit and method for enhancing bidirectional signal driving. Background Art

[0002] The circuit with bidirectional signal drive enhancement is a common circuit design in modern electronic technology. It is mainly used in systems that need to process complex signals, such as communication, control and data transmission. In many systems, the signal driving ability is a key factor affecting the system performance. If the signal driving ability is insufficient, it may cause problems such as signal distortion and noise interference. In addition, in many applications, it is necessary to process both forward and reverse signals at the same time. For example, in communication systems, the sending and receiving signals are bidirectional. Therefore, it is very important to design a circuit that can process bidirectional signals. In general, the design concept of the bidirectional signal drive enhancement circuit is to improve the performance of the system by enhancing the driving ability of the signal. It uses special circuit structures and components to enhance the amplitude and stability of the signal, thereby reducing signal distortion and noise interference. In addition, this circuit also has bidirectional processing capabilities and can process forward and reverse signals at the same time.

[0003] At present, in PCB circuit design, there is a situation where the distance between the two lines of digital communication is large. Due to the influence of the electrical characteristics of the transmission medium, the transmission signal will be attenuated. When the attenuation is too large, signal integrity problems will occur, thereby causing communication errors. Therefore, in view of the above situation, it is urgent to develop a circuit and method for bidirectional signal drive enhancement to overcome the shortcomings in current practical applications. Summary of the invention

[0004] The object of the present invention is to provide a circuit and method for enhancing bidirectional signal driving, so as to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A circuit for enhancing bidirectional signal driving, the circuit comprising: Bidirectional digital signal transmission line; A first-stage inverter is connected to one end of a bidirectional digital signal transmission line; A second-stage inverter is connected to the output end of the first-stage inverter; A small-resistance protection resistor is connected to the input end of the second-stage inverter; High level driving circuit, when one end of the circuit is at a high level, high level driving is performed through a small resistance protection resistor and a power supply connection; Low level driving circuit, when one end of the circuit is at a low level, low level driving is performed through the second stage inverter and a small resistance protection resistor; Self-driving circuit, when both ends of the circuit are in input state, realize high-level line driving mode; The conversion process protection circuit, when the circuit changes from high level to low level, the conversion process is protected by a small resistance protection resistor to prevent the power supply from directly contacting the ground; when the circuit changes from low level to high level, the conversion process is protected by a pull-up resistor at the signal output end to prevent the power supply from directly contacting the ground.

[0006] As a further solution of the present invention: when the voltage levels at both ends of the line are different, an enhanced NMOS tube is added at both ends of the bidirectional digital signal transmission line, wherein the two ends of the bidirectional digital signal transmission line are end A and end B respectively.

[0007] As a further solution of the present invention: when the level at the A end of the line is greater than or equal to the level at the B end, the enhancement type NMOS tube is not turned on; when the level at the A end of the line is less than the level at the B end, the enhancement type NMOS tube is forward turned on.

[0008] A method for enhancing bidirectional signal driving is applied to the bidirectional signal driving enhancement circuit as described above, and specifically comprises the following steps: (1) One end of the bidirectional digital signal transmission line is connected to a first-stage inverter, the output end of the first-stage inverter is connected to a second-stage inverter, and the input end of the second-stage inverter is connected to a small-resistance protection resistor; (2) When one end of the circuit is at a high level, a high level drive is performed through a small resistance protection resistor and a power supply connection. When one end of the circuit is at a low level, a low level drive is performed through a second-stage inverter and a small resistance protection resistor. (3) When both ends of the circuit are in input state, the high-level line drive mode is realized; (4) When the circuit changes from a high level to a low level, a small resistance protection resistor is used to protect the conversion process to prevent the power supply from directly contacting the ground; when the circuit changes from a low level to a high level, a pull-up resistor at the signal output end is used to protect the conversion process to prevent the power supply from directly contacting the ground.

[0009] As a further solution of the present invention: when the voltage levels at both ends of the line are different, an enhanced NMOS tube is added at both ends of the bidirectional digital signal transmission line, wherein the two ends of the bidirectional digital signal transmission line are end A and end B respectively.

[0010] As a further solution of the present invention: when the level at the A end of the line is greater than or equal to the level at the B end, the enhancement type NMOS tube is not turned on; when the level at the A end of the line is less than the level at the B end, the enhancement type NMOS tube is forward turned on.

[0011] Compared with the prior art, the present invention has the following beneficial effects: The circuit and method for driving and enhancing digital signals provided by the present invention can be used to enhance the stability of bidirectional signal transmission, and is also applicable to unidirectional signal transmission in simpler situations. At the same time, digital signal errors can be avoided, and the invention is worthy of promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 4 is a circuit diagram of a same-level line driver in an embodiment of the present invention.

[0013] Figure 2 1 is a circuit diagram of different level lines driving circuits in an embodiment of the present invention. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0016] See also Figure 1 and Figure 2 , an embodiment of the present invention provides a circuit for enhancing bidirectional signal driving, the circuit for enhancing bidirectional signal driving comprising: Bidirectional digital signal transmission line; A first-stage inverter is connected to one end of a bidirectional digital signal transmission line; A second-stage inverter is connected to the output end of the first-stage inverter; A small-resistance protection resistor is connected to the input end of the second-stage inverter; High level driving circuit, when one end of the circuit is at a high level, high level driving is performed through a small resistance protection resistor and a power supply connection; Low level driving circuit, when one end of the circuit is at a low level, low level driving is performed through the second stage inverter and a small resistance protection resistor; Self-driving circuit, when both ends of the circuit are in input state, realize high-level line driving mode; The conversion process protection circuit, when the circuit changes from high level to low level, the conversion process is protected by a small resistance protection resistor to prevent the power supply from directly contacting the ground; when the circuit changes from low level to high level, the conversion process is protected by a pull-up resistor at the signal output end to prevent the power supply from directly contacting the ground.

[0017] When the voltage levels at both ends of the line are different, an enhanced NMOS tube is added at both ends of the bidirectional digital signal transmission line, wherein the two ends of the bidirectional digital signal transmission line are end A and end B respectively.

[0018] Among them, when the level of the line A end is greater than or equal to the level of the B end, the enhancement NMOS tube is not turned on; when the level of the line A end is less than the level of the B end, the enhancement NMOS tube is forward-conducted.

[0019] A method for enhancing bidirectional signal driving is applied to the bidirectional signal driving enhancement circuit as described above, and specifically comprises the following steps: (1) One end of the bidirectional digital signal transmission line is connected to a first-stage inverter, the output end of the first-stage inverter is connected to a second-stage inverter, and the input end of the second-stage inverter is connected to a small-resistance protection resistor; (2) When one end of the circuit is at a high level, a high level drive is performed through a small resistance protection resistor and a power supply connection. When one end of the circuit is at a low level, a low level drive is performed through a second-stage inverter and a small resistance protection resistor. (3) When both ends of the circuit are in input state, the high-level line drive mode is realized; (4) When the circuit changes from a high level to a low level, a small resistance protection resistor is used to protect the conversion process to prevent the power supply from directly contacting the ground; when the circuit changes from a low level to a high level, a pull-up resistor at the signal output end is used to protect the conversion process to prevent the power supply from directly contacting the ground.

[0020] When the voltage levels at both ends of the line are different, an enhanced NMOS tube is added at both ends of the bidirectional digital signal transmission line, wherein the two ends of the bidirectional digital signal transmission line are end A and end B respectively.

[0021] Among them, when the level of the line A end is greater than or equal to the level of the B end, the enhancement NMOS tube is not turned on; when the level of the line A end is less than the level of the B end, the enhancement NMOS tube is forward-conducted.

[0022] In order to avoid digital signal errors, a circuit and method for driving and enhancing digital signals are designed to enhance the stability of bidirectional signal transmission, which is also applicable to unidirectional signal transmission in simpler situations.

[0023] In a bidirectional digital signal transmission line, when the voltage levels of both sides are consistent, the simplest way to enhance the drive is to pull up the line with a resistor. However, because both high and low voltage levels must be considered, the pull-up resistor should not be too small, which limits the drive capability.

[0024] like Figure 1 As shown, the present invention introduces a two-stage inverter and adds a small resistance protection resistor Rs to achieve high and low level drive enhancement, wherein Rx is a large resistance resistor and Rs is a small resistance resistor.

[0025] When one end of the circuit is at a high level output, the PMOS tube in the terminal inverter is turned on, and the circuit is driven at a high level by the power supply connected to a small resistor Rs.

[0026] When one end of the circuit is at a low level, the PMOS in the end inverter is turned off and the grounded NMOS is turned on to drive the circuit at a low level.

[0027] When both ends of the circuit are in input state, the circuit self-drives into high-level line driving mode.

[0028] When the circuit changes from high level to low level, before the terminal inverter PMOS is turned off, Rs protects the conversion process to prevent the power supply from directly connecting to the ground.

[0029] When the circuit changes from a low level to a high level, the pull-up resistor at the signal output end protects the conversion process to prevent the power supply from directly connecting to the ground.

[0030] When the voltage levels at both ends of the line are different, such as Figure 2 As shown, an enhanced NMOS tube is added between the two driving circuits, and the level of the A terminal is greater than or equal to the level of the B terminal. When the high level output is NMOS, it is not turned on, and both sides are high level self-driven; when the output of the line A terminal is low level, the NMOS tube is reversely conducted, and when the line B terminal outputs low level, the NMOS tube is forwardly conducted, wherein the level of the A terminal is greater than or equal to the level of the B terminal, RA and RB are large resistances, Rs is a small resistance level, the enhanced NMOS tube S terminal is connected to the B side, D terminal is connected to the A side, and G terminal is connected to the B side level.

[0031] It should be noted that in the present invention, unless otherwise clearly specified and limited, the terms "slide", "rotate", "fix", "have" and the like should be understood in a broad sense, for example, it can be a welding connection, a bolt connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A circuit for enhancing bidirectional signal driving, characterized in that: The circuit for enhancing bidirectional signal driving comprises: Bidirectional digital signal transmission line; A first-stage inverter is connected to one end of a bidirectional digital signal transmission line; A second-stage inverter is connected to the output end of the first-stage inverter; A small-resistance protection resistor is connected to the input end of the second-stage inverter; High level driving circuit, when one end of the circuit is at a high level, high level driving is performed through a small resistance protection resistor and a power supply connection; Low level driving circuit, when one end of the circuit is at a low level, low level driving is performed through the second stage inverter and a small resistance protection resistor; Self-driving circuit, when both ends of the circuit are in input state, realize high-level line driving mode; The conversion process protection circuit, when the circuit changes from high level to low level, the conversion process is protected by a small resistance protection resistor to prevent the power supply from directly contacting the ground; when the circuit changes from low level to high level, the conversion process is protected by a pull-up resistor at the signal output end to prevent the power supply from directly contacting the ground.

2. The circuit for enhancing bidirectional signal driving according to claim 1, characterized in that: When the voltage levels at both ends of the line are different, an enhanced NMOS tube is added at both ends of the bidirectional digital signal transmission line, wherein the two ends of the bidirectional digital signal transmission line are end A and end B respectively.

3. The circuit for enhancing bidirectional signal driving according to claim 2, characterized in that: When the level at the A end of the line is greater than or equal to the level at the B end, the enhancement NMOS tube is not turned on; When the level at the A end of the line is lower than the level at the B end, the enhancement NMOS tube is forward-conducted.

4. A method for enhancing bidirectional signal driving, applied to the circuit for enhancing bidirectional signal driving as claimed in any one of claims 1 to 3, characterized in that: The specific steps include: (1) One end of the bidirectional digital signal transmission line is connected to a first-stage inverter, the output end of the first-stage inverter is connected to a second-stage inverter, and the input end of the second-stage inverter is connected to a small-resistance protection resistor; (2) When one end of the circuit is at a high level, a high level drive is performed through a small resistance protection resistor and a power supply connection. When one end of the circuit is at a low level, a low level drive is performed through a second-stage inverter and a small resistance protection resistor. (3) When both ends of the circuit are in input state, the high-level line drive mode is realized; (4) When the circuit changes from a high level to a low level, a small resistance protection resistor is used to protect the conversion process to prevent the power supply from directly contacting the ground; when the circuit changes from a low level to a high level, a pull-up resistor at the signal output end is used to protect the conversion process to prevent the power supply from directly contacting the ground.

5. The method for enhancing bidirectional signal driving according to claim 4, characterized in that: When the voltage levels at both ends of the line are different, an enhanced NMOS tube is added at both ends of the bidirectional digital signal transmission line, wherein the two ends of the bidirectional digital signal transmission line are end A and end B respectively.

6. The method for enhancing bidirectional signal driving according to claim 5, characterized in that: When the level at the A end of the line is greater than or equal to the level at the B end, the enhancement NMOS tube is not turned on; When the level at the A end of the line is lower than the level at the B end, the enhancement NMOS tube is forward-conducted.

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