A signal transmission conversion circuit

Abstract

The present invention relates to a signal transmission conversion circuit, which includes a first comparator having an eleventh input terminal, a twelfth input terminal and an eleventh output terminal. The eleventh input terminal is used to connect to a forward signal input terminal, the twelfth input terminal is connected to a first reference voltage; a fourth comparator having a forty-first input terminal, a forty-second input terminal and a forty-first output terminal. The forty-first input terminal is used to connect to the eleventh output terminal, the forty-second input terminal is connected to the first reference voltage; a third comparator having a thirty-first input terminal, a thirty-second input terminal and a thirty-first output terminal. The thirty-first input terminal is used to connect to a reverse signal input terminal, the thirty-second input terminal is connected to the first reference voltage; and a second comparator having a twenty-first input terminal, a twenty-second input terminal and a twenty-first output terminal. The twenty-first input terminal is used to connect to the thirty-first output terminal, the twenty-second input terminal is connected to the first reference voltage. It can convert a serial port signal into a single-line transmission, improve the signal transmission level, and increase the signal transmission distance.

Description

Technical Field

[0001] The present invention relates to the field of signal processing, and particularly to a signal transmission conversion circuit. Background Art

[0002] A serial interface is a device that can convert the parallel data characters received from the CPU into a continuous serial data stream for transmission, and at the same time convert the received serial data stream into parallel data characters for supply to the CPU. Generally, the circuit that accomplishes this function is called a serial interface circuit. The concept of serial communication is very simple. It is a communication method that sends and receives bytes bit by bit.

[0003] Currently, the transmission signal distance of serial port signal transmission is short, and signal interference is large. Summary of the Invention

[0004] Based on this, in view of the problems of short transmission distance and large signal interference of the existing transmission circuit, it is necessary to provide a signal transmission conversion circuit.

[0005] A signal transmission conversion circuit includes:

[0006] A first comparator, having an eleventh input terminal, a twelfth input terminal and an eleventh output terminal. The eleventh input terminal is used to connect to a positive signal input terminal, the twelfth input terminal is connected to a first reference voltage. When the signal at the eleventh input terminal is greater than the first reference voltage received by the twelfth input terminal, the eleventh output terminal outputs a first high-level voltage signal, and the voltage value of the first high-level signal is greater than the positive input signal received by the eleventh input terminal.

[0007] A fourth comparator, having a forty-first input terminal, a forty-second input terminal and a forty-first output terminal. The forty-first input terminal is used to connect to the eleventh output terminal, the forty-second input terminal is connected to a first reference voltage. When the voltage received by the forty-first input terminal is greater than the first reference voltage received by the forty-second input terminal, the forty-first output terminal outputs a second high-level voltage signal, and the voltage value of the second high-level signal is less than the input signal received by the forty-first input terminal.

[0008] A third comparator, having a thirty-first input terminal, a thirty-second input terminal and a thirty-first output terminal. The thirty-first input terminal is used to connect to a negative signal input terminal, the thirty-second input terminal is connected to a first reference voltage. When the signal at the thirty-first input terminal is greater than the first reference voltage received by the thirty-second input terminal, the thirty-first output terminal outputs a third high-level voltage signal, and the voltage value of the third high-level signal is greater than the negative input signal received by the thirty-first input terminal.

[0009] and a second comparator, having a twenty-first input terminal, a twenty-second input terminal, and a twenty-first output terminal, wherein the twenty-first input terminal is used to connect to the thirty-first output terminal, the twenty-second input terminal is connected to a first reference voltage, and when the voltage received by the twenty-first input terminal is greater than the first reference voltage received by the twenty-second input terminal, the twenty-first output terminal outputs a fourth high-level voltage signal, and the voltage value of the fourth high-level signal is less than the input signal received by the twenty-first input terminal.

[0010] In one preferred embodiment, the signal transmission conversion circuit further includes a third resistor and a fourth resistor;

[0011] The third resistor is connected between the first reference voltage output terminal and the eleventh output terminal, and is used to control the voltage amplitude of the first high-level signal;

[0012] The fourth resistor is connected between the first reference voltage output terminal and the thirty-first output terminal, and is used to control the voltage amplitude of the third high-level signal.

[0013] In one preferred embodiment, the signal transmission conversion circuit further includes a fifth resistor and a sixth resistor;

[0014] The fifth resistor is connected between the twenty-first output terminal of the second comparator and the second reference voltage output terminal, and is used to control the voltage amplitude of the fourth high-level signal;

[0015] The sixth resistor is connected between the forty-first output terminal of the fourth comparator and the second reference voltage output terminal, and is used to control the voltage amplitude of the second high-level signal.

[0016] In one preferred embodiment, the signal transmission conversion circuit further includes a first resistor and a second resistor;

[0017] One end of the first resistor is electrically connected to one end of the second resistor, the other end of the second resistor is connected to the output terminal of the first reference voltage, the other end of the first resistor is grounded, and the twelfth input terminal of the first comparator is connected between the first resistor and the second resistor.

[0018] In one preferred embodiment, the signal transmission conversion circuit further includes a seventh resistor and an eighth resistor;

[0019] One end of the seventh resistor is electrically connected to one end of the eighth resistor, the other end of the eighth resistor is connected to the output terminal of the first reference voltage, the other end of the seventh resistor is grounded, and the thirty-second input terminal of the third comparator is connected between the seventh resistor and the eighth resistor.

[0020] In this embodiment, the above signal transmission conversion circuit 100 can convert a serial port signal into a single-wire transmission, boost the signal transmission level, and increase the signal transmission distance. Brief Description of the Drawings

[0021] Figure 1 It is a schematic circuit diagram of a signal transmission conversion circuit in a preferred embodiment of the present invention. Detailed Embodiment

[0022] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the drawings and embodiments.

[0023] A preferred embodiment of the present invention discloses a signal transmission conversion circuit 100, which includes a first comparator 110, a second comparator 120, a third comparator 130 and a fourth comparator 140.

[0024] The above first comparator 110 has an eleventh input terminal 11, a twelfth input terminal 12 and an eleventh output terminal 13. The eleventh input terminal 11 is used to connect to a positive signal input terminal TXD1 for receiving an input signal. The twelfth input terminal 12 is connected to a first reference voltage VCC, and the voltage amplitude of the first reference voltage VCC is less than the voltage amplitude of the input signal. When the signal at the eleventh input terminal 11 is greater than the first reference voltage VCC received by the twelfth input terminal 12, the eleventh output terminal 13 outputs a first high-level voltage signal, and the voltage value of the first high-level signal is greater than the positive input signal received by the eleventh input terminal.

[0025] The above fourth comparator 140 has a forty-first input terminal 41, a forty-second input terminal 42 and a forty-first output terminal 43. The forty-first input terminal 41 is used to connect to the eleventh output terminal 13, and the forty-second input terminal 42 is connected to a first reference voltage. When the voltage received by the forty-first input terminal 41 is greater than the first reference voltage received by the forty-second input terminal 42, the forty-first output terminal 43 outputs a second high-level voltage signal RXD2, and the voltage value of the second high-level signal is less than the input signal received by the forty-first input terminal 41;

[0026] The above-mentioned third comparator 130 has a thirty-first input terminal 31, a thirty-second input terminal 32 and a thirty-first output terminal 33. The thirty-first input terminal 31 is used to connect to the reverse signal input terminal TXD1, and the thirty-second input terminal 32 is connected to the first reference voltage. When the signal at the thirty-first input terminal 31 is greater than the first reference voltage received by the thirty-second input terminal 32, the thirty-first output terminal 33 outputs a third high-level voltage signal, and the voltage value of the third high-level signal is greater than the reverse input signal received by the thirty-first input terminal 31.

[0027] The above-mentioned second comparator 120 has a twenty-first input terminal 21, a twenty-second input terminal 22 and a twenty-first output terminal 23. The twenty-first input terminal 21 is used to connect to the thirty-first output terminal 33, and the twenty-second input terminal 22 is connected to the first reference voltage. When the voltage received by the twenty-first input terminal 21 is greater than the first reference voltage received by the twenty-second input terminal 22, the twenty-first output terminal 21 outputs a fourth high-level voltage signal RXD1, and the voltage value of the fourth high-level signal is less than the input signal received by the twenty-first input terminal 21.

[0028] In this embodiment, the signal transmission and transformation circuit 100 further includes a third resistor R3 and a fourth resistor R4. Specifically, the third resistor R3 is connected between the first reference voltage output terminal VCC and the eleventh output terminal 13, and is used to control the voltage amplitude of the first high-level signal. The fourth resistor R4 is connected between the first reference voltage output terminal VCC and the thirty-first output terminal R33, and is used to control the voltage amplitude of the third high-level signal.

[0029] In this embodiment, the signal transmission and transformation circuit 100 further includes a fifth resistor R5 and a sixth resistor R6. The fifth resistor R5 is connected between the twenty-first output terminal 23 of the second comparator and the second reference voltage output terminal VDD, and is used to control the voltage amplitude of the fourth high-level signal. The sixth resistor R6 is connected between the forty-first output terminal 43 of the fourth comparator and the second reference voltage output terminal VDD, and is used to control the voltage amplitude of the second high-level signal.

[0030] The signal transmission and transformation circuit 100 further includes a first resistor R1 and a second resistor R2. Specifically, one end of the first resistor R1 is electrically connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to the output terminal VCC of the first reference voltage, the other end of the first resistor R1 is grounded, and the twelfth input terminal 12 of the first comparator is connected between the first resistor R1 and the second resistor R2.

[0031] The signal transmission conversion circuit 100 further includes a seventh resistor R7 and an eighth resistor R8; specifically, one end of the seventh resistor R7 is electrically connected to one end of the eighth resistor R8, the other end of the eighth resistor R8 is connected to the output terminal VCC of the first reference voltage, the other end of the seventh resistor R7 is grounded, and the thirty-second input terminal 32 of the third comparator is connected between the seventh resistor R7 and the eighth resistor R8.

[0032] In this embodiment, the above signal transmission conversion circuit 100 can convert the serial port signal into single-line transmission, improve the signal transmission level, and increase the signal transmission distance.

[0033] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0034] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent should be subject to the appended claims.

Claims

1. A signal transmission conversion circuit, characterized in that, Comprising: A first comparator having an eleventh input terminal, a twelfth input terminal and an eleventh output terminal. The eleventh input terminal is used to connect to a positive signal input terminal, and the twelfth input terminal is connected to a first reference voltage. When the signal at the eleventh input terminal is greater than the first reference voltage received at the twelfth input terminal, the eleventh output terminal outputs a first high-level voltage signal, and the voltage value of the first high-level signal is greater than the positive input signal received at the eleventh input terminal; A fourth comparator having a forty-first input terminal, a forty-second input terminal and a forty-first output terminal. The forty-first input terminal is used to connect to the eleventh output terminal, and the forty-second input terminal is connected to a first reference voltage. When the voltage received at the forty-first input terminal is greater than the first reference voltage received at the forty-second input terminal, the forty-first output terminal outputs a second high-level voltage signal, and the voltage value of the second high-level signal is less than the input signal received at the forty-first input terminal; A third comparator having a thirty-first input terminal, a thirty-second input terminal and a thirty-first output terminal. The thirty-first input terminal is used to connect to a negative signal input terminal, and the thirty-second input terminal is connected to a first reference voltage. When the signal at the thirty-first input terminal is greater than the first reference voltage received at the thirty-second input terminal, the thirty-first output terminal outputs a third high-level voltage signal, and the voltage value of the third high-level signal is greater than the negative input signal received at the thirty-first input terminal; And a second comparator having a twenty-first input terminal, a twenty-second input terminal and a twenty-first output terminal. The twenty-first input terminal is used to connect to the thirty-first output terminal, and the twenty-second input terminal is connected to a first reference voltage. When the voltage received at the twenty-first input terminal is greater than the first reference voltage received at the twenty-second input terminal, the twenty-first output terminal outputs a fourth high-level voltage signal, and the voltage value of the fourth high-level signal is less than the input signal received at the twenty-first input terminal.

2. The signal transmission conversion circuit according to claim 1, characterized in that, The signal transmission and transformation circuit further includes a third resistor and a fourth resistor; The third resistor is connected between the first reference voltage output terminal and the eleventh output terminal for controlling the voltage amplitude of the first high-level signal; The fourth resistor is connected between the first reference voltage output terminal and the thirty-first output terminal for controlling the voltage amplitude of the third high-level signal.

3. The signal transmission conversion circuit according to claim 1, characterized in that, The signal transmission and transformation circuit further includes a fifth resistor and a sixth resistor; The fifth resistor is connected between the twenty-first output terminal of the second comparator and the second reference voltage output terminal for controlling the voltage amplitude of the fourth high-level signal; The sixth resistor is connected between the forty-first output terminal of the fourth comparator and the second reference voltage output terminal for controlling the voltage amplitude of the second high-level signal.

4. The signal transmission conversion circuit according to claim 1, characterized in that, The signal transmission and transformation circuit further includes a first resistor and a second resistor; One end of the first resistor is electrically connected to one end of the second resistor. The other end of the second resistor is connected to the output terminal of the first reference voltage. The other end of the first resistor is grounded. The twelfth input terminal of the first comparator is connected between the first resistor and the second resistor.

5. The signal transmission conversion circuit according to claim 1, characterized in that, The signal transmission and transformation circuit further includes a seventh resistor and an eighth resistor; One end of the seventh resistor is electrically connected to one end of the eighth resistor. The other end of the eighth resistor is connected to the output terminal of the first reference voltage. The other end of the seventh resistor is grounded. The thirty-second input terminal of the third comparator is connected between the seventh resistor and the eighth resistor.

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