Circuit structure for direct single-point superposition output of multi-stack signal frequency

Abstract

The utility model relates to a circuit structure for direct single-point superposition output of multi-stack signal frequency. The circuit structure comprises a signal input end, a signal coupling module, an input filtering module, a register filtering module, an operational amplifier circuit module, an output bias resistor, a first ground resistor and a signal output end, the signal input end is connected with the input end of the signal coupling module, the output end of the signal coupling module is connected with the input end of the input filtering module, the output end of the input filtering module is connected with the input end of the register filtering module, and the output end of the register filtering module is connected with the input end of the operational amplifier circuit module. The output end of the operational amplifier circuit module is connected with the first end of the output bias resistor and the input end of the register filter module, the second end of the output bias resistor is connected with the input end of the operational amplifier circuit module, the first end of the first resistor to ground is connected with the input end of the operational amplifier circuit module, and the second end of the first resistor to ground is grounded. The signal output end is connected with the second end of the output bias resistor.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit structures for signal frequency output, in particular to a circuit structure for direct single-point superposition output of multiple overlapping signal frequencies. Background Art

[0002] Currently, industrial audio testing requires separate testing of high, medium, and low frequency bands, and requires a single-point detection signal frequency source. This testing method requires an external frequency harness for automated testing when testing different frequencies at a single point. Furthermore, automated testing of different frequencies requires switching between different frequencies. Furthermore, when testing audio curves, there is a quantization error associated with a single sampling point. Summary of the Invention

[0003] Based on this, it is necessary to provide a circuit structure that directly outputs multiple overlapping signal frequencies at a single point.

[0004] The utility model solves the above-mentioned technical problem with the following technical solution: a circuit structure for directly superimposing and outputting multiple overlapping signal frequencies at a single point, comprising: a signal input terminal, a signal coupling module, an input filtering module, a register filtering module, an operational amplifier circuit module, an output bias resistor, a first ground resistor and a signal output terminal; the signal input terminal comprises a low-frequency signal input terminal, an intermediate-frequency signal input terminal and a high-frequency signal input terminal, the low-frequency signal input terminal, the intermediate-frequency signal input terminal and the high-frequency signal input terminal are respectively connected to the input terminal of the signal coupling module, and the output terminal of the signal coupling module is connected to the input terminal of the input filtering module. The output end of the input filter module is connected to the input end of the parasitic filter module, the output end of the parasitic filter module is connected to the first input end of the operational amplifier circuit module, the output end of the operational amplifier circuit module is respectively connected to the first end of the output bias resistor and the input end of the parasitic filter module, the second end of the output bias resistor is connected to the second input end of the operational amplifier circuit module, the first end of the first ground resistor is connected to the second input end of the operational amplifier circuit module, the second end of the first ground resistor is grounded, and the signal output end is connected to the second end of the output bias resistor.

[0005] In one embodiment, the signal coupling module includes a first resistor, a second resistor and a third resistor, the first end of the first resistor is connected to the high-frequency signal input end, the second end of the first resistor is connected to the input end of the signal coupling module, the first end of the second resistor is connected to the intermediate-frequency signal input end, the second end of the second resistor is connected to the input end of the signal coupling module, the first end of the third resistor is connected to the low-frequency signal input end, and the second end of the third resistor is connected to the input end of the signal coupling module.

[0006] In one embodiment, the resistance of the first resistor, the second resistor, and the third resistor are all 1KΩ.

[0007] In one embodiment, the input filtering module includes a filtering capacitor, a first end of the filtering capacitor is connected to the output end of the signal coupling module, and a second end of the filtering capacitor is connected to the input filtering module.

[0008] In one embodiment, the capacitance of the filter capacitor is 100nF.

[0009] In one embodiment, the parasitic filter module includes a parasitic filter capacitor and a second ground resistor, the first end of the parasitic filter capacitor is connected to the output end of the input filter module and the input end of the operational amplifier circuit module, the second end of the parasitic filter capacitor is grounded, the first end of the second ground resistor is connected to the output end of the input filter module and the input end of the operational amplifier circuit module, and the second end of the second ground resistor is grounded.

[0010] In one embodiment, the capacitance of the parasitic filter capacitor is 1 μF, and the resistance of the second resistor to ground is 10 KΩ.

[0011] In one embodiment, the operational amplifier circuit module includes an operational amplifier and a bias positive feedback resistor, the power supply terminal of the operational amplifier is connected to the power supply, the ground terminal of the operational amplifier is grounded, the non-inverting input terminal of the operational amplifier is connected to the output terminal of the parasitic filter module, the reverse input terminal of the operational amplifier is connected to the second end of the output bias resistor, the first ground resistor and the signal output terminal, the output terminal of the operational amplifier is connected to the first end of the output bias resistor and the first end of the bias positive feedback resistor, and the second end of the bias positive feedback resistor is connected to the input terminal of the parasitic filter module.

[0012] In one embodiment, the bias positive feedback resistor has a resistance of 15KΩ.

[0013] In one embodiment, the resistance of the output bias resistor is 5.68KΩ, and the resistance of the first ground resistor is 10KΩ.

[0014] The beneficial effects of the present invention are as follows: the present invention provides a circuit structure for direct single-point superposition output of multiple overlapping signal frequencies, by providing three input interfaces at the signal input end, and the three input interfaces are respectively used to input low-frequency, medium-frequency and high-frequency audio signals. By inputting three different frequency signals from the three input interfaces into the circuit structure for direct single-point superposition output of multiple overlapping signal frequencies, in this circuit, the three different frequency signals are first integrated in the signal coupling module, and then filtered by the input filter module and the storage filter module, and then amplified by the operational amplifier circuit module, and finally outputted from the signal output end after passing through the output bias resistor. The audio signal output by the circuit structure of the present application can be directly input into the detector for automatic detection, without switching back and forth between different detection frequencies in the detector, and without replacing the external wiring harness, thereby improving the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 The figure is a schematic diagram of a circuit structure for directly superimposing and outputting multiple signal frequencies at a single point according to an embodiment.

[0017] In the accompanying drawings, 10 is a circuit structure for direct single-point superposition output of multiple overlapping signal frequencies; 100 is a signal input terminal; 200 is a signal coupling module; 300 is an input filter module; 400 is a register filter module; 500 is an operational amplifier circuit module; 600 is a signal output terminal; R1 is a first resistor; R2 is a second resistor; R3 is a third resistor; C1 is a filter capacitor; C2 is a register filter capacitor; R4 is a second resistor to ground; R5 is a bias positive feedback resistor; R6 is an output bias resistor; R7 is a first resistor to ground; U1 is an operational amplifier. DETAILED DESCRIPTION

[0018] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The following will further describe the technical solution of the present invention in conjunction with the drawings of the embodiments of the present invention, and the present invention is not limited to the following specific implementation methods.

[0019] It should be understood that the same or similar reference numerals in the drawings of the embodiments correspond to the same or similar components. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right", "top", "bottom", etc. indicating an orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0020] In one embodiment, Figure 1 As shown, a circuit structure 10 for direct single-point superposition output of multiple overlapping signal frequencies includes: a signal input terminal 100, a signal coupling module 200, an input filtering module 300, a register filtering module 400, an operational amplifier circuit module 500, an output bias resistor R6, a first ground resistor R7 and a signal output terminal 600; the signal input terminal 100 includes a low-frequency signal input terminal, an intermediate-frequency signal input terminal and a high-frequency signal input terminal, the low-frequency signal input terminal, the intermediate-frequency signal input terminal and the high-frequency signal input terminal are respectively connected to the input terminal of the signal coupling module 200, the output terminal of the signal coupling module is connected to the input terminal of the input filtering module 300, and the input filtering module The output end of 300 is connected to the input end of the parasitic filter module 400, the output end of the parasitic filter module 400 is connected to the first input end of the operational amplifier circuit module 500, the output end of the operational amplifier circuit module 500 is respectively connected to the first end of the output bias resistor R6 and the input end of the parasitic filter module 400, the second end of the output bias resistor R6 is connected to the second input end of the operational amplifier circuit module 500, the first end of the first ground resistor R7 is connected to the second input end of the operational amplifier circuit module 500, the second end of the first ground resistor R7 is grounded, and the signal output end 600 is connected to the second end of the output bias resistor R6.

[0021] Specifically, the low-frequency signal input terminal is used to input an audio signal in a frequency band of approximately 100 Hz, the intermediate-frequency signal input terminal is used to input an audio signal in a frequency band of approximately 200 Hz, and the high-frequency signal input terminal is used to input an audio signal in a frequency band of approximately 400 Hz. After the audio signals of three different frequency bands pass through the circuit structure 10 provided in the present application for directly superimposing and outputting the multiple-frequency signals at a single point, an integrated multiple-frequency signal is output, and the output signal can be directly detected by a detector, thereby improving efficiency.

[0022] In this embodiment, three input interfaces are provided at the signal input end 100, and the three input interfaces are used to input low-frequency, medium-frequency, and high-frequency audio signals, respectively. By inputting the three different frequency signals from the three input interfaces into the circuit structure 10 for direct single-point superposition output of the multiple signal frequencies, in this circuit, the three different frequency signals are first integrated in the signal coupling module 200, then filtered by the input filter module 300 and the register filter module 400, and then amplified by the operational amplifier circuit module 500, and finally outputted from the signal output end 600 after passing through the output bias resistor R6. The audio signal output by the circuit structure of the present application can be directly input into the detector for automated detection, without the need to switch back and forth between different detection frequencies in the detector, and without the need to replace the external wiring harness, thereby improving detection efficiency.

[0023] In one embodiment, the signal coupling module includes a first resistor R1, a second resistor R2, and a third resistor R3. The first end of the first resistor R1 is connected to the high-frequency signal input end, the second end of the first resistor R1 is connected to the input end of the signal coupling module 200, the first end of the second resistor R2 is connected to the intermediate-frequency signal input end, the second end of the second resistor R2 is connected to the input end of the signal coupling module 200, the first end of the third resistor R3 is connected to the low-frequency signal input end, and the second end of the third resistor R3 is connected to the input end of the signal coupling module. Specifically, the high-frequency audio signal passes through the first resistor R1, the intermediate-frequency audio signal passes through the second resistor R2, and the low-frequency audio signal passes through the third resistor R3. The three different frequency signals pass through the corresponding resistors and are then integrated and output as an integrated signal.

[0024] In one embodiment, the first resistor R1, the second resistor R2, and the third resistor R3 all have a resistance of 1 kΩ. Specifically, by selecting the first resistor R1, the second resistor R2, and the third resistor R3 with a resistance of 1 kΩ, high-frequency signals, intermediate-frequency signals, and low-frequency signals can be better integrated and the integrity and stability of the output integrated signal can be maintained.

[0025] In one embodiment, the input filtering module 300 includes a filter capacitor C1, a first end of the filter capacitor C1 being connected to the output end of the signal coupling module 200, and a second end of the filter capacitor C1 being connected to the input filtering module 300. Specifically, the integrated signal output from the signal coupling module enters the filtering module, where the integrated signal passes through the filter capacitor C1 to filter out noise in the integrated signal, thereby purifying the integrated signal.

[0026] In one embodiment, the capacitance value of the filter capacitor C1 is 100 nF. Specifically, by selecting the filter capacitor C1 with a capacitance value of 100 nF, noise in the signal can be better filtered out.

[0027] In one embodiment, the parasitic filter module 400 includes a parasitic filter capacitor C2 and a second ground resistor R4. The first end of the parasitic filter capacitor C2 is connected to the output of the input filter module 300 and the input of the operational amplifier circuit module 500, and the second end of the parasitic filter capacitor C2 is grounded. The first end of the second ground resistor R4 is connected to the output of the input filter module 300 and the input of the operational amplifier circuit module 500, and the second end of the second ground resistor R4 is grounded. Specifically, the filtered integrated signal passes through the parasitic filter capacitor C2 and the second ground resistor R4, and the original ultra-high frequency integrated signal is subjected to secondary filtering and impurity removal before being returned and registered.

[0028] In one embodiment, the capacitance of the parasitic filter capacitor C2 is 1 μF, and the resistance of the second ground resistor R4 is 10 KΩ. Specifically, selecting the parasitic filter capacitor C2 with a capacitance of 1 μF and the second ground resistor R4 with a resistance of 10 KΩ can better perform secondary filtering and impurity removal on the original ultra-high frequency integrated signal before reflux and parasitization.

[0029] In one embodiment, the operational amplifier circuit module 500 includes an operational amplifier U1 and a bias positive feedback resistor R5. The power supply terminal of the operational amplifier U1 is connected to a power supply, the ground terminal of the operational amplifier U1 is grounded, the non-inverting input terminal of the operational amplifier U1 is connected to the output terminal of the parasitic filter module 400, the inverting input terminal of the operational amplifier U1 is connected to the second end of the output bias resistor R6, the first ground resistor R7, and the signal output terminal 600, the output terminal of the operational amplifier U1 is connected to the first end of the output bias resistor R6 and the first end of the bias positive feedback resistor R5, and the second end of the bias positive feedback resistor R5 is connected to the input terminal of the parasitic filter module 400. Specifically, the integrated signal enters the operational amplifier circuit module 500, passes through the operational amplifier U1, and can be amplified by the subsequent operational amplifier gain. The bias positive feedback resistor R5 is used for signal reflux sampling, and the integrated signal passing through the bias positive feedback resistor R5 can enter the operational amplifier U1 again for signal gain.

[0030] In one embodiment, the bias positive feedback resistor R5 has a resistance of 15KΩ. Specifically, selecting a bias positive feedback resistor R5 with a resistance of 15KΩ can better perform signal reflux sampling.

[0031] In one embodiment, the output bias resistor R6 has a resistance of 5.68KΩ, and the first ground resistor R7 has a resistance of 10KΩ. Specifically, selecting an output bias resistor R6 with a resistance of 5.68KΩ effectively prevents the automated testing equipment from becoming energized and potentially damaging the operational amplifier U1 when the signal output terminal 600 is connected to the automated testing equipment. Selecting a first ground resistor R7 with a resistance of 10KΩ effectively isolates the output terminal of the operational amplifier U1 from the negative feedback input, preventing the generation of self-excited signals.

[0032] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A circuit structure for directly superimposing and outputting multiple overlapping signal frequencies at a single point, characterized in that: include: Signal input terminal, signal coupling module, input filter module, register filter module, operational amplifier circuit module, output bias resistor, first ground resistor and signal output terminal; The signal input end includes a low-frequency signal input end, an intermediate-frequency signal input end, and a high-frequency signal input end. The low-frequency signal input end, the intermediate-frequency signal input end, and the high-frequency signal input end are respectively connected to the input end of the signal coupling module, the output end of the signal coupling module is connected to the input end of the input filtering module, the output end of the input filtering module is connected to the input end of the parasitic filtering module, the output end of the parasitic filtering module is connected to the first input end of the operational amplifier circuit module, the output end of the operational amplifier circuit module is respectively connected to the first end of the output bias resistor and the input end of the parasitic filtering module, the second end of the output bias resistor is connected to the second input end of the operational amplifier circuit module, the first end of the first resistor to ground is connected to the second input end of the operational amplifier circuit module, the second end of the first resistor to ground is grounded, and the signal output end is connected to the second end of the output bias resistor.

2. The circuit structure for directly superimposing and outputting multiple overlapping signal frequencies at a single point according to claim 1, characterized in that: The signal coupling module includes a first resistor, a second resistor and a third resistor. The first end of the first resistor is connected to the high-frequency signal input end, the second end of the first resistor is connected to the input end of the signal coupling module, the first end of the second resistor is connected to the intermediate-frequency signal input end, the second end of the second resistor is connected to the input end of the signal coupling module, the first end of the third resistor is connected to the low-frequency signal input end, and the second end of the third resistor is connected to the input end of the signal coupling module.

3. The circuit structure for directly superimposing and outputting multiple overlapping signal frequencies at a single point according to claim 2, characterized in that: The resistance values of the first resistor, the second resistor and the third resistor are all 1KΩ.

4. The circuit structure for directly superimposing and outputting multiple signal frequencies at a single point according to claim 1, characterized in that: The input filter module includes a filter capacitor, a first end of the filter capacitor is connected to the output end of the signal coupling module, and a second end of the filter capacitor is connected to the input filter module.

5. The circuit structure for directly superimposing and outputting multiple overlapping signal frequencies at a single point according to claim 4, characterized in that: The capacitance value of the filter capacitor is 100nF.

6. The circuit structure for directly superimposing and outputting multiple overlapping signal frequencies at a single point according to claim 1, characterized in that: The parasitic filter module includes a parasitic filter capacitor and a second ground resistor, the first end of the parasitic filter capacitor is connected to the output end of the input filter module and the input end of the operational amplifier circuit module, the second end of the parasitic filter capacitor is grounded, the first end of the second ground resistor is connected to the output end of the input filter module and the input end of the operational amplifier circuit module, and the second end of the second ground resistor is grounded.

7. The circuit structure for directly superimposing and outputting multiple signal frequencies at a single point according to claim 6, characterized in that: The capacitance value of the parasitic filter capacitor is 1 μF, and the resistance value of the second resistor to ground is 10 KΩ.

8. The circuit structure for directly superimposing and outputting multiple overlapping signal frequencies at a single point according to claim 1, characterized in that: The operational amplifier circuit module includes an operational amplifier and a bias positive feedback resistor. The power supply terminal of the operational amplifier is connected to the power supply, the ground terminal of the operational amplifier is grounded, the non-inverting input terminal of the operational amplifier is connected to the output terminal of the parasitic filter module, the inverting input terminal of the operational amplifier is connected to the second terminal of the output bias resistor, the first ground resistor and the signal output terminal, the output terminal of the operational amplifier is connected to the first terminal of the output bias resistor and the first terminal of the bias positive feedback resistor, and the second terminal of the bias positive feedback resistor is connected to the input terminal of the parasitic filter module.

9. The circuit structure for directly superimposing and outputting multiple overlapping signal frequencies at a single point according to claim 8, characterized in that: The bias positive feedback resistor has a resistance of 15KΩ.

10. The circuit structure for directly superimposing and outputting multiple signal frequencies at a single point according to claim 1, characterized in that: The resistance of the output bias resistor is 5.68KΩ, and the resistance of the first ground resistor is 10KΩ.

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