CN217689822U - One-way differential drive circuit - Google Patents
One-way differential drive circuit Download PDFInfo
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- CN217689822U CN217689822U CN202221615069.1U CN202221615069U CN217689822U CN 217689822 U CN217689822 U CN 217689822U CN 202221615069 U CN202221615069 U CN 202221615069U CN 217689822 U CN217689822 U CN 217689822U
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Abstract
The utility model discloses an one-way differential drive circuit, including first BL1551 analog switch and second BL1551 analog switch, the A2 port of first BL1551 analog switch links to each other with the 5V power through first resistance, the A1 port of first BL1551 analog switch and the A2 port of second BL1551 analog switch ground connection, the A1 port of second BL1551 analog switch links to each other with the 5V power through the second resistance, the VCC port of first BL1551 analog switch and second BL1551 analog switch all links to each other with the 5V power; ENB ports of the first BL1551 analog switch and the second BL1551 analog switch are signal input ends for receiving single-ended signals; the B ports of the first BL1551 analog switch and the second BL1551 analog switch are respectively a negative output end and a positive output end of a differential signal and are connected through a third resistor.
Description
Technical Field
The utility model relates to an electronic circuit technical field especially relates to an one-way differential drive circuit.
Background
The single-ended signal is a signal transmitted by one wire, and is a level difference between the signal transmitted on one wire and the ground; the differential signal is a signal transmitted by two wires, and is a level difference between signals transmitted by the two wires.
In circuit design, an unbalanced circuit structure is usually required to be converted into a balanced circuit structure, so as to overcome the problems of poor electromagnetic compatibility and poor interference resistance caused by the unbalanced circuit structure. The existing method for converting an unbalanced circuit structure into a balanced circuit structure includes adopting a balun form or adopting an operational amplifier to convert a single-ended signal into a differential signal, but the two methods can only be used for a mode circuit or a radio frequency circuit basically, are only suitable for transmission in a single board, cannot be used for long-distance transmission, and cannot be used in an application scene of hanging multiple devices. Therefore, a method for converting a single-ended signal into a differential signal through bus interface chips such as RS485 or RS422 is provided, but the low-speed RS485 or RS422 bus interface chip has good stability but cannot meet the application requirement of high-speed communication, and the RS485 or RS422 bus interface chip meeting the requirement of high-speed communication has high cost and poor stability. Moreover, the method for converting the single-ended signal into the differential signal through the bus interface chips such as RS485 or RS422 is still complex in matching in the application scenario of long-distance multiple devices regardless of the high-speed chip or the low-speed chip, so that the load capacity and the speed of the circuit are affected.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a simple structure's one-way difference drive circuit is provided in order not only to transmit signals at a high speed but also steadily, and can remote transmission signal.
In order to solve the technical problem, the purpose of the utility model is realized through following technical scheme: the unidirectional differential drive circuit comprises a first BL1551 analog switch and a second BL1551 analog switch, wherein an A2 port of the first BL1551 analog switch is electrically connected with a 5V power supply through a first resistor, an A1 port and a GND port of the first BL1551 analog switch are grounded, an A1 port of the second BL1551 analog switch is electrically connected with the 5V power supply through a second resistor, an A2 port and a GND port of the second BL1551 analog switch are grounded, and a VCC port of the first BL1551 analog switch and a VCC port of the second BL1551 analog switch are electrically connected with the 5V power supply; an ENB port of the first BL1551 analog switch and an ENB port of the second BL1551 analog switch are both signal input ends and are used for receiving a single-ended signal; the B port of the first BL1551 analog switch and the B port of the second BL1551 analog switch are respectively a negative output end and a positive output end of a differential signal, and the B port of the first BL1551 analog switch is connected with the B port of the second BL1551 analog switch through a third resistor.
The further technical scheme is as follows: a first diode is electrically connected between the B port of the first BL1551 analog switch and the third resistor, the cathode of the first diode is connected with the B port of the first BL1551 analog switch, and the anode of the first diode is grounded; a second diode is electrically connected between the port B of the second BL1551 analog switch and the third resistor, the cathode of the second diode is connected with the port B of the second BL1551 analog switch, and the anode of the second diode is grounded.
The further technical scheme is as follows: the first diode and the second diode are both voltage stabilizing diodes.
The further technical scheme is as follows: the B port of the first BL1551 analog switch is electrically connected with a first fuse, and the B port of the second BL1551 analog switch is electrically connected with a second fuse.
The further technical scheme is as follows: the first fuse and the second fuse are fuses with the models of SMD0805P020 TF.
The further technical scheme is as follows: a first grounding capacitor is electrically connected between the VCC port of the first BL1551 analog switch and the 5V power supply, and a second grounding capacitor is electrically connected between the VCC port of the second BL1551 analog switch and the 5V power supply.
The utility model has the advantages of: the utility model relates to an one-way differential drive circuit is through setting up first BL1551 analog switch and second BL1551 analog switch, the A2 port of first BL1551 analog switch links to each other with the 5V power through first resistance, the A1 port of first BL1551 analog switch and the A2 port ground connection of second BL1551 analog switch, the A1 port of second BL1551 analog switch passes through the second resistance and links to each other with the 5V power, the ENB port of first BL1551 analog switch and second BL1551 analog switch is the signal input part who receives single-ended signal, so that produce the voltage difference between the output signal of the B port of first BL1551 analog switch and second BL1551 analog switch when inputing the same signal, and the B port of first BL1551 analog switch and second BL1551 analog switch is differential signal negative output end and differential signal positive output end respectively, and link to each other through the third resistance, so as to obtain corresponding differential signal according to, realize turning into the differential signal with single-ended signal, and the differential signal structure, and the high-speed differential signal transmission is simple 1551 analog switch 1551, and can make the high-speed signal stable transmission load and can make the high-speed differential signal load stable again, and can make the high-speed differential signal.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without any creative effort.
Fig. 1 is a schematic diagram of an unidirectional differential driving circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Please refer to fig. 1, fig. 1 is a schematic diagram of an unidirectional differential driving circuit according to an embodiment of the present invention, the unidirectional differential driving circuit includes a first BL1551 analog switch U1 and a second BL1551 analog switch U2, an A2 port of the first BL1551 analog switch U1 is electrically connected to a 5V power supply through a first resistor R1, an A1 port and a GND port of the first BL1551 analog switch U1 are both grounded, an A1 port of the second BL1551 analog switch U2 is electrically connected to the 5V power supply through a second resistor R2, an A2 port and a GND port of the second BL1551 analog switch U2 are both grounded, and a VCC port of the first BL1551 analog switch U1 and a VCC port of the second BL1551 analog switch U2 are both electrically connected to the 5V power supply; the ENB port of the first BL1551 analog switch U1 and the ENB port of the second BL1551 analog switch U2 are signal input ends and are used for receiving a single-ended signal; the B port of the first BL1551 analog switch U1 and the B port of the second BL1551 analog switch U2 are a differential signal negative output terminal and a differential signal positive output terminal, respectively, and the B port of the first BL1551 analog switch U1 is connected to the B port of the second BL1551 analog switch U2 through a third resistor R3.
The first BL1551 analog switch U1 and the second BL1551 analog switch U2 are single-group low-voltage single-pole double-throw analog switches, the bandwidth is 300MHz, the on-time of the switch switching time is 12ns, the off-time of the switch switching time is 5ns, the requirement of high-speed signal transmission can be met, the maximum value of continuous current from an A1 port to a B port or from an A2 port to a B port in the BL1551 analog switch is 200mA, the maximum value of the continuous current has strong signal line driving capability, and long-distance multi-load transmission of signals can be realized. The 5V power supply may be a dc power supply with a voltage of 5V. The resistance values of the first resistor R1 and the second resistor R2 can be adjusted according to actual requirements, the third resistor R3 is a differential matching resistor, and the resistance value of the third resistor R3 can be adjusted according to equipment hung below the unidirectional differential drive circuit. The unidirectional differential drive circuit is characterized in that a first BL1551 analog switch U1 and a second BL1551 analog switch U2 are arranged, an A2 port of the first BL1551 analog switch U1 is connected with a 5V power supply through a first resistor R1, an A1 port of the first BL1551 analog switch U1 and an A2 port of the second BL1551 analog switch U2 are grounded, an A1 port of the second BL1551 analog switch U2 is connected with the 5V power supply through a second resistor R2, ENB ports of the first BL1551 analog switch U1 and the second BL1551 analog switch U2 are signal input ends for receiving single-ended signals, so that when the same signal is input, a voltage difference is generated between output signals of B ports of the first BL1551 analog switch U1 and the second BL1551 analog switch U2, negative B ports of the first BL1551 analog switch U1 and the second BL1551 analog switch U2 are respectively a differential signal positive electrode output end and a differential signal positive electrode output end, the voltage difference is obtained through a differential resistor R3, and a simple differential signal cost can be obtained according to the differential signal output end; moreover, the BL1551 analog switch has strong stability, can transmit signals at high speed and has short switching time, so that the unidirectional differential drive circuit can transmit signals at high speed and stably and can transmit signals under multiple loads at long distance.
Specifically, a first diode D1 is electrically connected between the B port of the first BL1551 analog switch U1 and the third resistor R3, the cathode of the first diode D1 is connected to the B port of the first BL1551 analog switch U1, and the anode of the first diode D1 is grounded; a second diode D2 is electrically connected between the B port of the second BL1551 analog switch U2 and the third resistor R3, a cathode of the second diode D2 is connected to the B port of the second BL1551 analog switch U2, and an anode of the second diode D2 is grounded. The first diode D1 with the grounded anode is electrically connected with the negative output end of the differential signal, and the second diode D2 with the grounded anode is electrically connected with the positive output end of the differential signal, so that the output of the unidirectional differential drive circuit can be protected from overvoltage. Preferably, the first diode D1 and the second diode D2 are both zener diodes.
Specifically, a port B of the first BL1551 analog switch U1 is electrically connected to a first fuse F1, a port B of the second BL1551 analog switch U2 is electrically connected to a second fuse F2, the first fuse F1 is electrically connected to a negative output end of the differential signal, and the second fuse F2 is electrically connected to a positive output end of the differential signal, so that the transmitted signal is output after passing through the corresponding fuse, and an overcurrent protection effect can be performed on the output of the unidirectional differential driving circuit. Preferably, the first fuse F1 and the second fuse F2 are fuses of the type SMD0805P020 TF.
Specifically, a first grounding capacitor C1 is electrically connected between a VCC port of the first BL1551 analog switch U1 and the 5V power supply, and a second grounding capacitor C2 is electrically connected between a VCC port of the second BL1551 analog switch U2 and the 5V power supply. The power input of the VCC ports of the first BL1551 analog switch U1 and the second BL1551 analog switch U2 is filtered by setting the first grounding capacitor C1 and the second grounding capacitor C2 respectively.
Based on the design, during work, a single-ended signal is input into the unidirectional differential drive circuit, the single-ended signal is a digital signal and can be high level or low level, and an ENB port of the first BL1551 analog switch and an ENB port of the second BL1551 analog switch receive the single-ended signal. When the single-ended signal is a high-level signal, namely a received signal is 1, the port A1 of the first BL1551 analog switch is internally connected with the port B of the first BL1551 analog switch, the port A1 of the second BL1551 analog switch is internally connected with the port B of the second BL1551 analog switch, at the moment, the port B of the first BL1551 analog switch outputs a low-level signal, namely the output signal of the negative electrode output end of the differential signal is 0, the port B of the second BL1551 analog switch outputs a high-level signal, namely the output signal of the positive electrode output end of the differential signal is 5V, the differential pressure difference between the positive electrode output end of the differential signal and the negative electrode output end of the differential signal is +5V, and the differential signal output by the unidirectional differential drive circuit is A1-level signal; when the single-ended signal is a low-level signal, that is, the received signal is 0, the port A2 of the first BL1551 analog switch is internally connected with the port B of the first BL1551 analog switch, the port A2 of the second BL1551 analog switch is internally connected with the port B of the second BL1551 analog switch, at this time, the port B of the first BL1551 analog switch outputs a high-level signal, that is, the output signal of the negative output end of the differential signal is 5V, the port B of the second BL1551 analog switch outputs a low-level signal, that is, the output signal of the positive output end of the differential signal is 0, the differential pressure between the positive output end of the differential signal and the negative output end of the differential signal is-5V, and the differential signal output by the unidirectional differential drive circuit is a 0-level signal.
To sum up, the utility model relates to an one-way differential drive circuit is through setting up first BL1551 analog switch and second BL1551 analog switch, the A2 port of first BL1551 analog switch is connected with the 5V power through first resistance, the A1 port of first BL1551 analog switch and the A2 port of second BL1551 analog switch ground connection, the A1 port of second BL1551 analog switch is connected with the 5V power through the second resistance, the ENB port of first BL1551 analog switch and second BL1551 analog switch is the signal input end that receives the single-ended signal, so that produce the voltage difference between the output signal of the B port of first BL1551 analog switch and second BL1551 analog switch when inputing the same signal, and the B port of first BL1551 analog switch and second BL1551 analog switch is differential signal output end and differential signal positive output end respectively, and link to can obtain the corresponding differential signal according to the voltage difference, realize that the single-ended signal turns into the differential signal, simple structure is low cost; moreover, the BL1551 analog switch has strong stability and can transmit signals at high speed, and the switching time of the switch is short, so that the unidirectional differential drive circuit can transmit signals at high speed and stably and can transmit signals at a long distance under multiple loads.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A unidirectional differential drive circuit is characterized by comprising a first BL1551 analog switch and a second BL1551 analog switch, wherein an A2 port of the first BL1551 analog switch is electrically connected with a 5V power supply through a first resistor, an A1 port and a GND port of the first BL1551 analog switch are both grounded, an A1 port of the second BL1551 analog switch is electrically connected with the 5V power supply through a second resistor, an A2 port and a GND port of the second BL1551 analog switch are both grounded, and a VCC port of the first BL1551 analog switch and a VCC port of the second BL1551 analog switch are both electrically connected with the 5V power supply; an ENB port of the first BL1551 analog switch and an ENB port of the second BL1551 analog switch are signal input ends and are used for receiving a single-ended signal; the B port of the first BL1551 analog switch and the B port of the second BL1551 analog switch are respectively a negative output end and a positive output end of a differential signal, and the B port of the first BL1551 analog switch is connected with the B port of the second BL1551 analog switch through a third resistor.
2. The unidirectional differential drive circuit of claim 1, wherein a first diode is electrically connected between the B port of the first BL1551 analog switch and the third resistor, a cathode of the first diode is connected with the B port of the first BL1551 analog switch, and an anode of the first diode is grounded; a second diode is electrically connected between the port B of the second BL1551 analog switch and the third resistor, the cathode of the second diode is connected with the port B of the second BL1551 analog switch, and the anode of the second diode is grounded.
3. The uni-directional differential drive circuit according to claim 2, wherein the first and second diodes are both zener diodes.
4. The unidirectional differential drive circuit of claim 1, wherein a first fuse is electrically connected to a B port of the first BL1551 analog switch, and a second fuse is electrically connected to a B port of the second BL1551 analog switch.
5. The uni-directional differential drive circuit according to claim 4, wherein the first fuse and the second fuse are fuses of SMD0805P020 TF.
6. The unidirectional differential driving circuit of claim 1, wherein a first ground capacitor is electrically connected between a VCC port of the first BL1551 analog switch and a 5V power supply, and a second ground capacitor is electrically connected between a VCC port of the second BL1551 analog switch and the 5V power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221615069.1U CN217689822U (en) | 2022-06-24 | 2022-06-24 | One-way differential drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221615069.1U CN217689822U (en) | 2022-06-24 | 2022-06-24 | One-way differential drive circuit |
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| Publication Number | Publication Date |
|---|---|
| CN217689822U true CN217689822U (en) | 2022-10-28 |
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| CN202221615069.1U Active CN217689822U (en) | 2022-06-24 | 2022-06-24 | One-way differential drive circuit |
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Address after: 510000 room 1301, No. 37, Jinlong street, Xiangjiang financial and business center, Nansha District, Guangzhou City, Guangdong Province (office only) Patentee after: Guangzhou Tongze Kangwei Technology Co.,Ltd. Address before: 510000 room 1301, No. 37, Jinlong street, Xiangjiang financial and business center, Nansha District, Guangzhou City, Guangdong Province (office only) Patentee before: Guangzhou Tongze Kangwei Intelligent Technology Co.,Ltd. |