Low-pass filter circuit capable of keeping high frequency
By combining peak and trough detection, median processing, and high-pass filtering in a circuit structure, the problem of low-frequency noise affecting DC information in high-frequency signals is solved, thus improving signal stability.
Patent Information
- Application Number
- CN202423220618.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-12-25
AI Technical Summary
In a DC circuit containing high-frequency signals and with DC bias, low-frequency noise can be filtered out by a simple high-pass filter, resulting in decreased circuit stability.
The circuit structure employs a combination of a signal input unit, a peak detection unit, a trough detection unit, a median detection unit, an average value detection unit, a superposition unit, and a high-pass filter unit. Through peak and trough envelope detection, median processing, and high-pass filtering, low-frequency noise is filtered out while maintaining DC information.
While maintaining high-frequency information, it effectively filters out low-frequency noise superimposed on the DC bias, thereby improving signal stability.
Smart Images
Figure CN223625844U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a low-pass filter circuit that maintains high frequency. Background Technology
[0002] Currently, some DC circuits containing high-frequency signals and with DC bias are mixed with low-frequency noise. Simple high-pass filtering will filter out the DC information, making them unusable and affecting circuit stability.
[0003] In view of the above-mentioned shortcomings, the designer actively researched and innovated in order to create a new type of low-pass filter circuit that maintains high frequency, making it more valuable for industrial applications. Utility Model Content
[0004] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a low-pass filter circuit that maintains high frequency.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A low-pass filter circuit that maintains high frequency includes a signal input unit, the output of which is connected to the input of a peak detection unit, the output of which is connected to the input of a median detection unit, the output of which is connected to the input of an average value detection unit, the output of which is connected to the input of a superposition unit, the superposition unit being connected to an output, the output of which is connected to the input of a trough detection unit, the output of which is connected to the input of the median detection unit, the output of which is connected to the input of a high-pass filter unit, and the output of which is connected to the input of the superposition unit.
[0007] Preferably, in the low-pass filter circuit that maintains high frequency, the peak detection unit includes chip U1 and chip U2. The first pin of chip U1 is connected to the signal input unit, the second pin of chip U1 is connected to the anode of diode D1, the cathode of diode D1 is connected to the third pin of chip U1, the second pin of chip U1 is connected to the third pin of chip U2 through resistor R1, the third pin of chip U1 is connected to the anode of diode D2, the cathode of diode D2 is connected to the first pin of chip U2 through resistor R2, and the first pin of chip U2 is grounded through capacitor C1.
[0008] Preferably, in the low-pass filter circuit that maintains high frequency, the trough detection unit includes chip U3 and chip U4. The first pin of chip U3 is connected to the signal input unit, the second pin of chip U3 is connected to the cathode of diode D3, the anode of diode D3 is connected to the third pin of chip U3, the second pin of chip U3 is connected to the third pin of chip U4 through resistor R3, the third pin of chip U3 is connected to the cathode of diode D4, the anode of diode D4 is connected to the first pin of chip U4 through resistor R4, and the first pin of chip U4 is grounded through capacitor C2.
[0009] Preferably, in the low-pass filter circuit that maintains high frequency, the chip U1 and chip U2 are one of TL072ACDT, NE5532ANG, MC33078DR2G or NE5532PSR.
[0010] Preferably, in the low-pass filter circuit that maintains high frequency, the chip U3 and chip U4 are one of the following: TL072ACDT, NE5532ANG, MC33078DR2G, or NE5532PSR.
[0011] Preferably, in the low-pass filter circuit that maintains high frequency, the median detection unit includes a chip U5. The first pin of the chip U5 is connected to the output terminal of the peak detection unit through a resistor R5, the first pin of the chip U5 is connected to the output terminal of the trough detection unit through a resistor R6, the second pin of the chip U5 is grounded through a resistor R7, and the second pin of the chip U5 is connected to the third pin of the chip U5 through a resistor R8.
[0012] Preferably, in the low-pass filter circuit that maintains high frequency, the chip U5 is one of TL072ACDT, NE5532ANG, MC33078DR2G or NE5532PSR.
[0013] Preferably, in the low-pass filter circuit that maintains high frequency, the superposition unit includes a chip U6. The first pin of the chip U6 is connected to the output of the average value detection unit through a resistor R9. The first pin of the chip U6 is connected to the output of the high-pass filter unit through a resistor R10. The second pin of the chip U6 is grounded through a resistor R11. The second pin of the chip U6 is connected to the third pin of the chip U6 through a resistor R12.
[0014] Preferably, in the low-pass filter circuit that maintains high frequency, the chip U6 is one of TL072ACDT, NE5532ANG, MC33078DR2G or NE5532PSR.
[0015] By means of the above solution, this utility model has at least the following advantages:
[0016] This invention filters out low-frequency noise superimposed on the DC bias while preserving high-frequency information, effectively maintaining the DC information as a high-pass filter and improving signal stability.
[0017] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description
[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a schematic diagram of the principle of this utility model;
[0020] Figure 2 yes Figure 1 Waveforms output by each unit;
[0021] Figure 3 This is a circuit diagram of the peak detection unit of this utility model;
[0022] Figure 4 This is a circuit diagram of the valley detection unit of this utility model;
[0023] Figure 5 This is a circuit diagram of the median detection unit of this utility model;
[0024] Figure 6 This is a circuit diagram of the superposition unit of this utility model;
[0025] Figure 7 This is a circuit diagram of the average value detection unit of this utility model;
[0026] Figure 8 This is the circuit diagram of the high-pass filter unit of this utility model. Detailed Implementation
[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0028] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0029] Example
[0030] like Figures 1 to 8 As shown, a low-pass filter circuit that maintains high frequency includes a signal input unit 1. The output terminal of the signal input unit 1 is connected to the input terminal of a peak detection unit 2. The output terminal of the peak detection unit 2 is connected to the input terminal of a median detection unit 3. The output terminal of the median detection unit 3 is connected to the input terminal of an average value detection unit 4. The output terminal of the average value detection unit 4 is connected to the input terminal of a superposition unit 5. The superposition unit 5 is connected to an output terminal. The output terminal of the signal input unit 1 is connected to the input terminal of a trough detection unit 6. The output terminal of the trough detection unit 6 is connected to the input terminal of the median detection unit 3. The output terminal of the signal input unit 1 is connected to the input terminal of a high-pass filter unit 7. The output terminal of the high-pass filter unit 7 is connected to the input terminal of the superposition unit 5.
[0031] The peak detection unit 2 described in this utility model includes chip U1 and chip U2. The first pin of chip U1 is connected to signal input unit 1, the second pin of chip U1 is connected to the anode of diode D1, the cathode of diode D1 is connected to the third pin of chip U1, the second pin of chip U1 is connected to the third pin of chip U2 through resistor R1, the third pin of chip U1 is connected to the anode of diode D2, the cathode of diode D2 is connected to the first pin of chip U2 through resistor R2, and the first pin of chip U2 is grounded through capacitor C1. The model of chip U1 and chip U2 is NE5532.
[0032] The trough detection unit 6 described in this utility model includes chip U3 and chip U4. The first pin of chip U3 is connected to signal input unit 1, the second pin of chip U3 is connected to the cathode of diode D3, the anode of diode D3 is connected to the third pin of chip U3, the second pin of chip U3 is connected to the third pin of chip U4 through resistor R3, the third pin of chip U3 is connected to the cathode of diode D4, the anode of diode D4 is connected to the first pin of chip U4 through resistor R4, and the first pin of chip U4 is grounded through capacitor C2. The model of chip U3 and chip U4 is one of TL072ACDT, NE5532ANG, MC33078DR2G or NE5532PSR.
[0033] The median detection unit 3 described in this utility model includes a chip U5. The first pin of the chip U5 is connected to the output terminal of the peak detection unit 2 through a resistor R5. The first pin of the chip U5 is connected to the output terminal of the trough detection unit 6 through a resistor R6. The second pin of the chip U5 is grounded through a resistor R7. The second pin of the chip U5 is connected to the third pin of the chip U5 through a resistor R8. The chip U5 is one of the following: TL072ACDT, NE5532ANG, MC33078DR2G, or NE5532PSR.
[0034] The superposition unit 5 described in this invention includes a chip U6. The first pin of chip U6 is connected to the output of the average value detection unit 4 via resistor R9. The first pin of chip U6 is also connected to the output of the high-pass filter unit 7 via resistor R10. The second pin of chip U6 is grounded via resistor R11, and the second pin of chip U6 is connected to the third pin of chip U6 via resistor R12. The chip U6 is one of the following: TL072ACDT, NE5532ANG, MC33078DR2G, or NE5532PSR.
[0035] The chip used in this invention is NE5532ANG.
[0036] The working principle of this utility model is as follows:
[0037] like Figure 2As shown, a high-frequency signal (the signal at the input terminal of the signal input unit) containing low-frequency noise and DC bias is processed by a peak detection unit and a trough detection unit to obtain the peak envelope A and trough envelope B of the signal. Then, the median detection unit is used to take the median of the envelope signal to obtain the median C of the envelope signal. The median signal is a low-frequency signal containing DC bias. This signal is processed by an averaging unit to obtain the DC bias signal D of the signal. At the same time, the input signal is processed by a high-pass filtering unit to filter out the DC component. Then, it is superimposed with the output signal of the averaging detection unit through a superposition unit to obtain an output signal with low-frequency noise filtered out.
[0038] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0039] In the description of this application, it should be noted that the terms "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0040] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or vertical, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0041] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0042] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A low-pass filter circuit that maintains high frequency, comprising a signal input unit (1), characterized in that: The output of the signal input unit (1) is connected to the input of the peak detection unit (2), the output of the peak detection unit (2) is connected to the input of the median detection unit (3), the output of the median detection unit (3) is connected to the input of the average value detection unit (4), the output of the average value detection unit (4) is connected to the input of the superposition unit (5), the superposition unit (5) is connected to the output, the output of the signal input unit (1) is connected to the input of the trough detection unit (6), the output of the trough detection unit (6) is connected to the input of the median detection unit (3), the output of the signal input unit (1) is connected to the input of the high-pass filter unit (7), and the output of the high-pass filter unit (7) is connected to the input of the superposition unit (5).
2. The low-pass filter circuit for maintaining high frequency according to claim 1, characterized in that: The peak detection unit (2) includes chip U1 and chip U2. The first pin of chip U1 is connected to the signal input unit (1). The second pin of chip U1 is connected to the anode of diode D1. The cathode of diode D1 is connected to the third pin of chip U1. The second pin of chip U1 is connected to the third pin of chip U2 through resistor R1. The third pin of chip U1 is connected to the anode of diode D2. The cathode of diode D2 is connected to the first pin of chip U2 through resistor R2. The first pin of chip U2 is grounded through capacitor C1.
3. The low-pass filter circuit for maintaining high frequency according to claim 1, characterized in that: The valley detection unit (6) includes chip U3 and chip U4. The first pin of chip U3 is connected to the signal input unit (1). The second pin of chip U3 is connected to the cathode of diode D3. The anode of diode D3 is connected to the third pin of chip U3. The second pin of chip U3 is connected to the third pin of chip U4 through resistor R3. The third pin of chip U3 is connected to the cathode of diode D4. The anode of diode D4 is connected to the first pin of chip U4 through resistor R4. The first pin of chip U4 is grounded through capacitor C2.
4. A low-pass filter circuit for maintaining high frequency according to claim 2, characterized in that: The chip U1 and chip U2 are one of the following: TL072ACDT, NE5532ANG, MC33078DR2G or NE5532PSR.
5. A low-pass filter circuit for maintaining high frequency according to claim 3, characterized in that: The models of chips U3 and U4 are TL072ACDT, NE5532ANG, MC33078DR2G or NE5532PSR.
6. A low-pass filter circuit for maintaining high frequency according to claim 1, characterized in that: The median detection unit (3) includes a chip U5. The first pin of the chip U5 is connected to the output terminal of the peak detection unit (2) through a resistor R5. The first pin of the chip U5 is connected to the output terminal of the trough detection unit (6) through a resistor R6. The second pin of the chip U5 is grounded through a resistor R7. The second pin of the chip U5 is connected to the third pin of the chip U5 through a resistor R8.
7. A low-pass filter circuit for maintaining high frequency according to claim 6, characterized in that: The chip U5 is one of the following: TL072ACDT, NE5532ANG, MC33078DR2G, or NE5532PSR.
8. A low-pass filter circuit for maintaining high frequency according to claim 1, characterized in that: The superposition unit (5) includes a chip U6. The first pin of the chip U6 is connected to the output terminal of the average value detection unit (4) through a resistor R9. The first pin of the chip U6 is connected to the output terminal of the high-pass filter unit (7) through a resistor R10. The second pin of the chip U6 is grounded through a resistor R11. The second pin of the chip U6 is connected to the third pin of the chip U6 through a resistor R12.
9. A low-pass filter circuit for maintaining high frequency according to claim 8, characterized in that: The chip U6 is one of the following: TL072ACDT, NE5532ANG, MC33078DR2G, or NE5532PSR.