Megahertz-level signal demultiplexer

Abstract

The utility model discloses a megahertz-level signal demultiplexer, which relates to the field of various electronic experiments and comprises a power supply module and a plurality of signal transmission channels, and any signal transmission channel comprises a filter circuit and a signal output circuit which are connected with each other. When the signal demultiplexer works, a source signal is input to the signal output circuit through the filter circuit, the filter circuit is used for filtering the source signal, and the signal output circuit is used for outputting an output signal according to the source signal; and the power supply module is used for providing required working voltage for the signal output circuit. According to the utility model, one path of source signal can be simply and conveniently distributed into multiple paths of same output signals for transmission, the distortion degree of the output signals is low, and the transmission frequency can reach the MHz level.

Description

Technical Field

[0001] This utility model relates to various fields of electronic experiments, and in particular to a megahertz-level signal multiplexer. Background Technology

[0002] For applications requiring synchronous transmission of multiple signals, the main methods currently used include: (1) using multiple signal generators to output in parallel and simultaneously matching the signal generators synchronously; (2) using traditional passive power dividers to distribute the signals into multiple paths; (3) using signal power amplifiers to amplify the signal before distributing it into multiple paths; and (4) using multi-array microprocessors to synchronously control the output of multiple signals. Among these, method (1) suffers from poor convenience and high signal distortion; the power divider in method (2) causes signal amplitude attenuation; method (3) requires a large number of external instruments, occupies a lot of space, and has low convenience. Method (4) relies on computer programming, operation, and debugging, which involves data signal processing, has high design requirements, and is costly. In summary, the existing methods for achieving synchronous transmission of multiple signals suffer from problems such as low transmission frequency, high distortion, and low ease of use. Utility Model Content

[0003] In response to the aforementioned problems and technical requirements, the applicant has proposed a megahertz-level signal multiplexer.

[0004] The technical solution of this utility model is as follows:

[0005] A megahertz-level signal multiplexer includes a power module and multiple signal transmission channels, wherein each signal transmission channel includes a connected filter circuit and a signal output circuit.

[0006] When the signal multiplexer is working, the source signal is input to the signal output circuit through the filter circuit. The filter circuit is used to filter the source signal, and the signal output circuit is used to output the output signal according to the source signal. The power supply module is used to provide the required operating voltage to the signal output circuit.

[0007] A further technical solution is that the filter circuit includes a resistor R1 and a capacitor C1. One end of the resistor R1 is connected to the signal input terminal, and the other end of the resistor R1 is grounded through the capacitor C1. The other end of the resistor R1 is also connected to the signal output circuit.

[0008] A further technical solution is that the frequency and duty cycle of the output signal are the same as those of the source signal;

[0009] The source signal includes a PWM signal, and the output signal includes a pulse square wave signal.

[0010] A further technical solution is that the signal output circuit includes a driver U1, resistors R2 and R3, capacitor C2 and capacitor C3, wherein the driver U1 is of model UCC5350, and the driver U1 includes a VCC1 pin, an IN+ pin, an IN- pin, a GND1 pin, a VEE2 pin, a CLAMP pin, an OUT pin and a VCC2 pin.

[0011] The other end of the resistor R1 is connected to the IN+ pin, the VCC1 pin is connected to the power module, and the IN- pin is grounded to the GND1 pin.

[0012] The VEE2 pin is grounded, the VCC2 pin is grounded through capacitor C2, capacitor C3 is connected in parallel with capacitor C2, and the VCC2 pin is also connected to the power module through resistor R3;

[0013] The CLAMP and OUT pins are both connected to one end of resistor R2, and the other end of resistor R2 is connected to the signal output terminal.

[0014] A further technical solution is that the signal input terminal and the signal output terminal include an SMB radio frequency interface.

[0015] A further technical solution is that the power module includes an adjustable voltage circuit, a power input circuit, and an isolated power supply circuit;

[0016] The adjustable voltage circuit includes a voltage regulator U7, diodes D2 and D3, a resistor R17, capacitors C22, C23, C24, and C27, and a sliding resistor R19.

[0017] The input terminal of the voltage regulator U7 is connected to the isolation power supply circuit, the output terminal of the voltage regulator U7 is connected to the positive terminal of the diode D2, and the negative terminal of the diode D2 is connected to the input terminal of the voltage regulator U7.

[0018] The output terminal of the voltage regulator U7 is connected to one end of the resistor R17. One end of the resistor R17 is connected to the cathode of the diode D3 and one end of the capacitor C22, forming the output terminal of the adjustable voltage circuit. The output terminal of the adjustable voltage circuit is connected to the VCC1 pin of the driver U1 and one end of the resistor R3.

[0019] The other end of capacitor C22 is grounded, capacitors C23 and C24 are connected in parallel with capacitor C22, and the cathode of diode D3 is connected to the other end of resistor R17, one end of capacitor C27, and the adjustment terminal of voltage regulator U7.

[0020] The other end of the capacitor C27 is connected to one end of the sliding resistor R19 and grounded, and the other end of the resistor R17 is connected to the sliding end of the sliding resistor R19.

[0021] A further technical solution is that the power input circuit includes a power connector CN1, a rectifier bridge chip D1, a capacitor C5, a capacitor C6, and an inductor L1.

[0022] The power connector CN1 is connected to the rectifier bridge chip D1, the capacitor C5 is connected between the positive output terminal and the negative output terminal of the rectifier bridge chip D1, and the capacitor C6 is connected in parallel with the capacitor C5.

[0023] One end of the inductor L1 is connected to the positive output terminal of the rectifier bridge chip D1, the other end of the inductor L1 forms the power supply VIN output terminal, and the negative output terminal of the rectifier bridge chip D1 is connected to analog ground.

[0024] A further technical solution is that the power input circuit also includes capacitors C7, C8, and C9;

[0025] One end of capacitor C7 is connected to the power supply VIN output terminal, and the other end of capacitor C7 is connected to analog ground. Capacitors C8 and C9 are both connected in parallel with capacitor C7.

[0026] A further technical solution is that the isolated power supply circuit includes an isolated power supply chip U4, an inductor L2, a capacitor C15, a capacitor C16, and a capacitor C17.

[0027] The positive input terminal of the isolation power chip U4 is connected to the power output terminal VIN, and the negative input terminal of the isolation power chip U4 is connected to analog ground.

[0028] The positive output terminal of the isolation power chip U4 is connected to one end of the inductor L2, and the other end of the inductor L2 is connected to the input terminal of the voltage regulator U7 in the adjustable voltage circuit.

[0029] One end of capacitor C15 is connected to the other end of inductor L2, and the other end of capacitor C15 is connected to the negative output terminal of isolation power chip U4 and grounded. Capacitors C16 and C17 are both connected in parallel with capacitor C15.

[0030] A further technical solution is that the power module also includes a power indicator circuit, which includes a resistor R22 and an LED1. The power VIN output terminal is connected to the positive terminal of the LED1 through the resistor R22, and the negative terminal of the LED1 is connected to analog ground.

[0031] The beneficial technical effects of this utility model are:

[0032] (1) It can easily and conveniently distribute and transmit one source signal with the same amplitude. After a single source signal is input, multiple identical signal outputs can be generated. The output signal shape is standard and without distortion. The transmission frequency can reach the MHz level. The distortion is low. The frequency and amplitude of multiple output signals are synchronized and consistent. The transmission loss is small and the anti-interference is strong. It can be connected to external cables for long-distance transmission.

[0033] (2) It has a wide source signal trigger range, is compatible with 3V to 5V signal input, and can adjust the amplitude of the output signal within a certain range. It is simple to operate and has a stable output. Attached Figure Description

[0034] Figure 1 This is a structural block diagram of one embodiment of the signal multiplexer provided by this utility model.

[0035] Figure 2 This is a circuit diagram of one embodiment of the signal transmission channel provided by this utility model.

[0036] Figure 3 This is a circuit schematic diagram of one embodiment of the signal input terminal provided by this utility model.

[0037] Figure 4 This is a circuit diagram of one embodiment of the power input circuit provided by this utility model.

[0038] Figure 5 This is a circuit diagram of one embodiment of the isolated power supply circuit provided by this utility model.

[0039] Figure 6 This is a circuit diagram of one embodiment of the adjustable voltage circuit provided by this utility model.

[0040] Figure 7 This is a circuit diagram of one embodiment of the power indicator circuit provided by this utility model. Detailed Implementation

[0041] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this disclosure.

[0042] This invention provides a megahertz-level signal multiplexer, primarily used in applications requiring synchronous transmission of multiple signals. Its purpose is to distribute and transmit source signals (time-domain signals), achieving a multi-channel splitting effect. Figure 1 As shown, in one embodiment of this utility model, the signal multiplexer includes a power module and multiple signal transmission channels, wherein...

[0043] For any signal transmission channel, there are connected filter circuits and signal output circuits;

[0044] When the signal multiplexer is working, the source signal is input to the signal output circuit through the filter circuit. The filter circuit is used to filter the source signal, and the signal output circuit is used to output the output signal according to the source signal. The power supply module is used to provide the required operating voltage to the signal output circuit.

[0045] Specifically, the frequency and duty cycle of the output signal are the same as those of the source signal. In this embodiment, a total of 6 signal transmission channels are provided. The source signal is a PWM (Pulse Width Modulation) signal, and the output signal is a pulse square wave signal. That is, in this embodiment, a signal multiplexer is used to generate 6 pulse square wave signals with the same frequency and duty cycle as the PWM signal based on a single PWM signal. The megahertz level specifically refers to the transmission frequency of the output signal of the signal multiplexer reaching the megahertz level. In specific implementation, the number of signal transmission channels can be selected according to the actual application needs. The specific forms of the power supply module, filter circuit, and signal output circuit can be referred to the following description.

[0046] Taking one signal transmission channel as an example, Figure 2 The circuit structure of one embodiment of the signal transmission channel is shown, such as Figure 2 As shown, in the signal transmission channel, the filtering circuit includes a resistor R1 and a capacitor C1. One end of the resistor R1 is connected to the signal input terminal, and the other end of the resistor R1 is grounded through the capacitor C1 and connected to the signal output circuit.

[0047] The signal output circuit includes driver U1, resistor R2, resistor R3, capacitor C2 and capacitor C3. The driver U1 can be a UCC5350 and includes VCC1 pin, IN+ pin, IN- pin, GND1 pin, VEE2 pin, CLAMP pin, OUT pin and VCC2 pin.

[0048] The other end of resistor R1 is connected to the IN+ pin, the VCC1 pin is connected to the power module, and the IN- pin is grounded to the GND1 pin. The VEE2 pin is grounded, the VCC2 pin is grounded through capacitor C2, capacitor C3 is connected in parallel with capacitor C2, and the VCC2 pin is also connected to the power module through resistor R3. The CLAMP pin and the OUT pin are both connected to one end of resistor R2, and the other end of resistor R2 is connected to the signal output terminal.

[0049] Specifically, resistor R1 and capacitor C1 form an RC filter to filter the source signal. The filtered source signal is then input to driver U1. In this embodiment, driver U1 is a UCC5350, specifically a single-channel isolated gate driver with discrete output manufactured by Texas Instruments (TI). This driver has strong output capability and can use the source signal as its trigger condition to emit a pulse square wave signal with the same frequency and duty cycle as the source signal. Its specific working principle is consistent with existing technology and will not be elaborated here. The resistance value of resistor R2 can be 50Ω to adapt to most terminal receiving devices.

[0050] The power module provides a power supply voltage VCC connected to the VCC1 pin and one end of resistor R3. The power supply voltage VCC can be adjusted via the power module, allowing the driver U1 to control the amplitude of the output signal within an adjustable range. In practice, adjusting the power supply voltage VCC can fine-tune the amplitude of the output signal to compensate for signal attenuation during transmission.

[0051] The source signal is input through the signal input terminal, and the output signal is output through the signal output terminal. The physical form of the signal input terminal and the signal output terminal can be an SMB radio frequency interface, such as... Figure 2 and Figure 3 As shown, in this embodiment, the signal input terminal uses RF interface RF2, and the signal output terminal uses RF interface RF1. Both RF interface RF1 and RF2 can be model HJ-SMB012. The first and second pins of RF interface RF2 are connected to the fifth pin of RF interface RF2 via resistor R4. The fifth pin of RF interface RF2 is connected to the IN+ pin of driver U1 via resistor R1. The first, second, third, and fourth pins of RF interface RF2 are all grounded. The fifth pin of RF interface RF1 is connected to the CLAMP and OUT pins of driver U1 via resistor R2. The first, second, third, and fourth pins of RF interface RF2 are all grounded.

[0052] Furthermore, the power module includes an adjustable voltage circuit, a power input circuit, and an isolated power supply circuit that are adapted for connection; such as Figure 4As shown, the power input circuit includes a power connector CN1, a rectifier bridge chip D1, capacitors C5 and C6, an inductor L1, capacitors C7, C8, and C9. The power connector CN1 is connected to the rectifier bridge chip D1. Capacitor C5 is connected between the positive and negative output terminals of the rectifier bridge chip D1. Capacitor C6 is connected in parallel with capacitor C5. One end of inductor L1 is connected to the positive output terminal of the rectifier bridge chip D1, and the other end of inductor L1 forms the power output terminal VIN. The negative output terminal of the rectifier bridge chip D1 is connected to analog ground. One end of capacitor C7 is connected to the power output terminal VIN, and the other end of capacitor C7 is connected to analog ground. Capacitors C8 and C9 are both connected in parallel with capacitor C7.

[0053] In this embodiment, the power connector CN1 is of model XT30PW-M, the rectifier bridge chip D1 is of model TB34S, the first and second pins of the power connector CN1 are respectively connected to the two AC pins of the rectifier bridge chip, the external AC power is input to the rectifier bridge chip D1 through the power connector CN1, the rectifier bridge chip D1 rectifies it into DC power VIN, and outputs it to the isolation power circuit through the output terminal of the power VIN.

[0054] like Figure 5 As shown, the isolated power supply circuit includes an isolated power supply chip U4, an inductor L2, capacitors C15, C16, and C17. In this embodiment, the isolated power supply chip U4 is model B1212S-2WR3. The positive input terminal (+VIN) of the isolated power supply chip U4 is connected to the power supply output terminal VIN, and the negative input terminal (-VIN) of the isolated power supply chip U4 is connected to analog ground. The positive output terminal (+VOUT) of the isolated power supply chip U4 is connected to one end of the inductor L2, and the other end of the inductor L2 is connected to the adjustable voltage circuit. One end of the capacitor C15 is connected to the other end of the inductor L2, and the other end of the capacitor C15 is connected to the negative output terminal (-VOUT) of the isolated power supply chip U4 and grounded. Capacitors C16 and C17 are both connected in parallel with capacitor C15. The power supply VIN is input to the isolated power supply chip U4, and the isolated power supply chip U4 generates a 12V power supply voltage and outputs it to the adjustable voltage circuit.

[0055] like Figure 6 As shown, the adjustable voltage circuit includes a voltage regulator U7, diodes D2 and D3, a resistor R17, capacitors C22, C23, C24, and C27, and a sliding resistor R19.

[0056] In this embodiment, the voltage regulator U7 is model LM317S / TR. The input terminal (IN) of the voltage regulator U7 is connected to the other end of the inductor L2 in the isolation power supply circuit, and is used to connect to the 12V power supply voltage generated by the isolation power supply chip U4. The output terminal (OUT) of the voltage regulator U7 is connected to the positive terminal of the diode D2, and the negative terminal of the diode D2 is connected to the input terminal (IN) of the voltage regulator U7.

[0057] The output terminal (OUT) of the voltage regulator U7 is connected to one end of the resistor R17. One end of the resistor R17 is connected to the negative terminal of the diode D3 and one end of the capacitor C22, forming the output terminal of the adjustable voltage circuit. The output terminal of the adjustable voltage circuit is connected to the VCC1 pin of the driver U1 and one end of the resistor R3, and is used to provide the power supply voltage VCC to the driver U1.

[0058] The other end of capacitor C22 is grounded. Capacitors C23 and C24 are connected in parallel with capacitor C22. The cathode of diode D3 is connected to the other end of resistor R17, one end of capacitor C27, and the adjustment terminal (ADJ) of voltage regulator U7. The other end of capacitor C27 is connected to one end of sliding resistor R19 and grounded. The other end of resistor R17 is connected to the sliding terminal of sliding resistor R19. The adjustable voltage circuit can adjust the voltage at the adjustment terminal of voltage regulator U7 by adjusting the resistance of sliding resistor R19 connected to the circuit, thereby adjusting the power supply voltage VCC output to driver U1.

[0059] Furthermore, the power module also includes a power indicator circuit, such as... Figure 7 As shown, the power indicator circuit includes a resistor R22 and an LED1. The power output terminal VIN is connected to the positive terminal of LED1 through resistor R22, and the negative terminal of LED1 is connected to analog ground. The power indicator circuit is used to indicate the power input status; when an external power supply is connected to the power input circuit, LED1 is lit. It should be noted that the aforementioned grounding specifically refers to the common ground. The analog ground is connected to the analog ground through a zero-resistance resistor R12 to isolate the analog ground from the common ground. The signal multiplexer is based on a PCB, and all the aforementioned IC components and resistors / capacitors are mounted on the PCB.

[0060] In summary, the signal multiplexer proposed in this invention can effectively distribute and transmit source signals, realize the function of mapping source signals into multiple output signals for synchronous transmission, and has the advantages of low distortion, high bandwidth, flexibility, convenience, and low cost.

[0061] In the description of this specification, the reference to the term "an embodiment / method," etc., means that a specific feature, structure, or characteristic of that embodiment / method is included in at least one embodiment / method of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment / method. In the description of this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0062] Those skilled in the art should understand that the above embodiments are merely for clearly illustrating this disclosure and are not intended to limit the scope of this disclosure. Other improvements and variations that are directly derived or conceived by those skilled in the art without departing from the spirit and concept of this utility model should be considered to be included within the protection scope of this utility model.

Claims

1. A megahertz-level signal multiplexer, characterized in that, Includes a power module and multiple signal transmission channels, among which, For any signal transmission channel, there are connected filter circuits and signal output circuits; When the signal multiplexer is working, the source signal is input to the signal output circuit through the filter circuit. The filter circuit is used to filter the source signal, and the signal output circuit is used to output the output signal according to the source signal. The power supply module is used to provide the required operating voltage to the signal output circuit.

2. The megahertz-level signal multiplexer according to claim 1, characterized in that, The filter circuit includes a resistor R1 and a capacitor C1. One end of the resistor R1 is connected to the signal input terminal, and the other end of the resistor R1 is grounded through the capacitor C1. The other end of the resistor R1 is also connected to the signal output circuit.

3. The megahertz-level signal multiplexer according to claim 1, characterized in that, The frequency and duty cycle of the output signal are the same as those of the source signal; The source signal includes a PWM signal, and the output signal includes a pulse square wave signal.

4. The megahertz-level signal multiplexer according to claim 2, characterized in that, The signal output circuit includes driver U1, resistor R2, resistor R3, capacitor C2, and capacitor C3. The driver U1 is a UCC5350 and includes pins VCC1, IN+, IN-, GND1, VEE2, CLAMP, OUT, and VCC2. The other end of the resistor R1 is connected to the IN+ pin, the VCC1 pin is connected to the power module, and the IN- pin is grounded to the GND1 pin. The VEE2 pin is grounded, the VCC2 pin is grounded through capacitor C2, capacitor C3 is connected in parallel with capacitor C2, and the VCC2 pin is also connected to the power module through resistor R3; The CLAMP and OUT pins are both connected to one end of resistor R2, and the other end of resistor R2 is connected to the signal output terminal.

5. The megahertz-level signal multiplexer according to claim 4, characterized in that, The signal input terminal and the signal output terminal include an SMB radio frequency interface.

6. The megahertz-level signal multiplexer according to claim 4, characterized in that, The power module includes an adjustable voltage circuit, a power input circuit, and an isolated power supply circuit. The adjustable voltage circuit includes a voltage regulator U7, diodes D2 and D3, a resistor R17, capacitors C22, C23, C24, and C27, and a sliding resistor R19. The input terminal of the voltage regulator U7 is connected to the isolation power supply circuit, the output terminal of the voltage regulator U7 is connected to the positive terminal of the diode D2, and the negative terminal of the diode D2 is connected to the input terminal of the voltage regulator U7. The output terminal of the voltage regulator U7 is connected to one end of the resistor R17. One end of the resistor R17 is connected to the cathode of the diode D3 and one end of the capacitor C22, forming the output terminal of the adjustable voltage circuit. The output terminal of the adjustable voltage circuit is connected to the VCC1 pin of the driver U1 and one end of the resistor R3. The other end of capacitor C22 is grounded. Capacitors C23 and C24 are connected in parallel with capacitor C22. The negative terminal of diode D3 is connected to the other end of resistor R17, one end of capacitor C27, and the adjustment terminal of voltage regulator U7. The other end of capacitor C27 is connected to one end of sliding resistor R19 and grounded. The other end of resistor R17 is connected to the sliding terminal of sliding resistor R19.

7. The megahertz-level signal multiplexer according to claim 6, characterized in that, The power input circuit includes a power connector CN1, a rectifier bridge chip D1, a capacitor C5, a capacitor C6, and an inductor L1. The power connector CN1 is connected to the rectifier bridge chip D1, the capacitor C5 is connected between the positive output terminal and the negative output terminal of the rectifier bridge chip D1, and the capacitor C6 is connected in parallel with the capacitor C5. One end of the inductor L1 is connected to the positive output terminal of the rectifier bridge chip D1, the other end of the inductor L1 forms the power supply VIN output terminal, and the negative output terminal of the rectifier bridge chip D1 is connected to analog ground.

8. The megahertz-level signal multiplexer according to claim 7, characterized in that, The power input circuit also includes capacitors C7, C8 and C9. One end of capacitor C7 is connected to the power supply VIN output terminal, and the other end of capacitor C7 is connected to analog ground. Capacitors C8 and C9 are both connected in parallel with capacitor C7.

9. The megahertz-level signal multiplexer according to claim 7, characterized in that, The isolated power supply circuit includes an isolated power supply chip U4, an inductor L2, a capacitor C15, a capacitor C16, and a capacitor C17. The positive input terminal of the isolation power chip U4 is connected to the power output terminal VIN, and the negative input terminal of the isolation power chip U4 is connected to analog ground. The positive output terminal of the isolation power chip U4 is connected to one end of the inductor L2, and the other end of the inductor L2 is connected to the input terminal of the voltage regulator U7 in the adjustable voltage circuit. One end of capacitor C15 is connected to the other end of inductor L2, and the other end of capacitor C15 is connected to the negative output terminal of isolation power chip U4 and grounded. Capacitors C16 and C17 are both connected in parallel with capacitor C15.

10. The megahertz-level signal multiplexer according to claim 7, characterized in that, The power module also includes a power indicator circuit, which includes a resistor R22 and an LED1. The power output terminal VIN is connected to the positive terminal of LED1 through the resistor R22, and the negative terminal of LED1 is connected to analog ground.

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