CN211606496U - Low-noise discharge circuit for interference equipment - Google Patents
Low-noise discharge circuit for interference equipment Download PDFInfo
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- CN211606496U CN211606496U CN202020065513.1U CN202020065513U CN211606496U CN 211606496 U CN211606496 U CN 211606496U CN 202020065513 U CN202020065513 U CN 202020065513U CN 211606496 U CN211606496 U CN 211606496U
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Abstract
The utility model discloses a low noise discharge circuit for interfering device belongs to electronic circuit technical field, including first filter circuit, first noise amplification circuit, second noise amplification circuit, first prevent the radio frequency filter circuit of static damage circuit and power input end, prevent that static damage circuit is connected with radio frequency filter circuit, constitute noise amplification circuit's power protection anti-interference circuit. The radio frequency signal input end is connected with the first filter circuit, the first noise amplification circuit and the second noise amplification circuit in sequence until the radio frequency signal output end outputs the radio frequency signal. The radio frequency filter device at the front end of the low-noise discharge circuit power supply circuit effectively prevents electromagnetic interference from an external power supply, and then prevents high-voltage static electricity from damaging the low-noise discharge circuit device through an anti-static damage circuit, so that the normal work of each functional circuit of the low-noise discharge circuit is ensured, and particularly, the amplification effect of the electromagnetic interference crosstalk noise amplification circuit from the power supply on radio frequency signals is effectively prevented.
Description
Technical Field
The utility model relates to an electronic circuit technical field, more specifically relates to a low noise discharge circuit for interference equipment.
Background
The radio frequency signal transmitting circuit is an indispensable part in interference equipment, has high index requirement, not only adapts to different interference target signal transmitting frequencies, but also meets the requirement of successful interference on power. The low-noise amplifier circuit is a functional unit which is a constituent of the radio frequency signal transmitting circuit, is a post-stage circuit of a signal source in the radio frequency signal transmitting circuit, and is an interface circuit of which the signal source meets the input limit of the power amplifying circuit, so that the low-noise amplifier circuit is a functional unit which ensures reliable operation. The low-noise amplifier circuit filters and amplifies the output signal of the signal source of the interference equipment in low noise, and outputs a signal which meets the requirements of the rear-end power amplifier circuit for certain power and signal-to-noise ratio.
The low noise amplifier circuit is generally composed of a filter and a low noise amplifier, wherein the low noise amplifier is a core device. The choice and application design of which determines the main performance of the low noise amplifier circuit. The printed board design layout of the low-noise discharge circuit is realized by matching the layout according to the actual impedance of the front and rear end radio frequency devices so as to meet the structure and performance requirements of the low-noise discharge circuit, and meanwhile, the low-noise discharge circuit is designed without considering the damage of high-frequency interference signals of a power supply end and static electricity to the devices, so that the low-noise discharge circuit can be abnormal in operation and even damaged.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide a low noise amplifier circuit for interference equipment for solve power input's high frequency signal interference and static to the damage of low noise amplifier circuit.
The purpose of the utility model is realized through the following technical scheme:
a low-noise discharging circuit for interference equipment comprises a first filter circuit, a first noise amplifying circuit and a second noise amplifying circuit which are sequentially connected, and further comprises a radio frequency filter circuit and an anti-static damage circuit, wherein the radio frequency filter circuit is connected with a power supply input end VCC _ in.
Further, the radio frequency filter circuit comprises a first filter C21 and a second filter C22, a first pin of the first filter C21 is connected to the power supply input terminal VCC _ in, a second pin of the first filter C21 is connected to a positive input terminal VCC of the power supply circuit, and a third pin of the first filter C21 is connected to the low noise discharge circuit housing through a thread and is commonly grounded; and a first pin of the second filter C22 is connected with a power supply negative electrode input end GND _ in, and a second pin of the second filter C22 is connected with the low-noise discharge circuit shell and is commonly grounded.
Further, the anti-electrostatic damage circuit includes a first anti-electrostatic device D1, a first pin of the first anti-electrostatic device D1 is connected to the power input terminal VCC _ in, and a second pin of the first anti-electrostatic device D1 is grounded.
Further, the first filter circuit comprises an inductor L1, a capacitor C1, an inductor L2, a capacitor C2, an inductor L3 and a capacitor C3, wherein the inductor L1 is connected in parallel with the capacitor C1, one end of the parallel connection is grounded, and the other end of the parallel connection is connected with a radio frequency signal input end; meanwhile, the radio frequency signal input end is connected with an inductor L2 and a capacitor C2 in series; the inductor L3 is connected in parallel with the capacitor C3, one end of the parallel inductor L3 is grounded, and the other end of the parallel inductor L3 is connected with the capacitor C2 and the first noise amplifying circuit.
Further, first noise amplification circuit includes first noise amplifier N1, first noise amplifier N1's first pin pass through electric capacity C4 with first filter circuit connects, first noise amplifier N1's second pin, fourth pin ground connection, first noise amplifier N1's third pin is connected with inductance L4 and electric capacity C5, inductance L4 one end with electric capacity C5 connects, the inductance L4 other end is connected with electric capacity C6, electric capacity C7, resistance R1 respectively, resistance R1 is connected with power supply circuit positive input VCC, electric capacity C5 is connected to second noise amplification circuit.
Further, the second noise amplification circuit includes second noise amplifier N2, the first pin of second noise amplifier N2 pass through electric capacity C8 with first noise amplification circuit, second noise amplifier N2's second pin, fourth pin ground connection, second noise amplifier N2's third pin is connected with inductance L5 and electric capacity C9, inductance L5 one end with electric capacity C9 connects, the inductance L5 other end is connected with electric capacity C10, electric capacity C11, resistance R2 respectively, resistance R2 is connected with power supply circuit positive input end VCC, electric capacity C9 is connected to the radio frequency signal output.
Furthermore, the radio frequency noise reduction circuit also comprises an attenuation circuit connected with the second noise amplification circuit, and the attenuation circuit is connected to the radio frequency signal output end.
Furthermore, the attenuation circuit comprises a pi-type attenuator composed of a capacitor C12, a capacitor C13, a resistor R3, a resistor R4 and a resistor R5, one end of the capacitor C12 is connected with a third pin of a second noise amplifier N2, the other end of the capacitor C12 is connected with the resistor R3 and the resistor R4, the other end of the resistor R4 is connected with the resistor R5 and the capacitor C13, the other ends of the resistor R3 and the resistor R5 are grounded, and the other end of the capacitor C13 is connected with a radio frequency signal output end.
The utility model has the advantages that:
1. in the utility model, the radio frequency filter device at the front end of the low-noise discharge circuit power circuit effectively prevents the electromagnetic interference from an external power supply, and then prevents high-voltage static electricity from damaging the low-noise discharge circuit device by preventing the static damage circuit, thereby ensuring the normal work of each functional circuit of the low-noise discharge, and particularly effectively preventing the amplification effect of the electromagnetic interference crosstalk noise amplification circuit from the power supply on radio frequency signals;
2. in the utility model, the filter circuit is added at the front end of the low-noise amplifying circuit, which can flexibly select the signal of the specific frequency band, filter the signal outside the specific frequency band, and meet the frequency range and the signal-to-noise ratio required by the rear-end signal frequency processing;
3. the utility model discloses in, through adopting two-stage noise amplification circuit, can carry out the two-stage signal to the radio frequency small signal and enlarge, guaranteed output radio frequency signal's power strength and SNR.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a block diagram of a circuit connection for a low noise discharge circuit for an interfering device;
FIG. 2 is a circuit schematic of a first embodiment of a low noise discharge circuit for an interfering device;
fig. 3 is a circuit schematic of a second embodiment of a low noise discharge circuit for an interfering device.
Detailed Description
The technical solution of the present invention is described in further detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following description. Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
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 only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Before describing the embodiments, some necessary terms need to be explained. For example:
if the terms "first," "second," etc. are used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. Thus, a "first" element discussed below could also be termed a "second" element without departing from the teachings of the present invention. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present.
The various terms appearing in this application are used for the purpose of describing particular embodiments only and are not intended as limitations on the invention, except where the context clearly dictates otherwise, the singular is intended to include the plural as well.
When the terms "comprises" and/or "comprising" are used in this specification, these terms are intended to specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence and/or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Example 1
As shown in fig. 1 and 2, a low-noise discharging circuit for an interfering device includes a first filter circuit, a first noise amplifier circuit, a second noise amplifier circuit, a radio frequency filter circuit connected to a power input VCC _ in, and an anti-electrostatic damage circuit, which are connected in sequence.
As shown in fig. 2, the rf filter circuit includes a first filter C21 and a second filter C22, a first pin of the first filter C21 is connected to the power input VCC _ in, a second pin of the first filter C21 is connected to the positive input VCC of the power circuit, and a third pin of the first filter C21 is connected to the low noise discharging circuit housing through a screw and is commonly grounded; the first pin of the second filter C22 is connected to the power supply negative input terminal GND _ in, and the second pin of the second filter C22 is connected to the low noise discharging circuit casing and commonly grounded.
The anti-electrostatic damage circuit comprises a first anti-electrostatic device D1, a first pin of the first anti-electrostatic device D1 is connected with a power input terminal VCC _ in, and a second pin of the first anti-electrostatic device D1 is grounded.
The radio frequency filter device at the front end of the low-noise discharge circuit power supply circuit effectively prevents electromagnetic interference from an external power supply, and then prevents high-voltage static electricity from damaging the low-noise discharge circuit device through an anti-static damage circuit, so that the normal work of each functional circuit of the low-noise discharge circuit is ensured, and particularly, the amplification effect of the electromagnetic interference crosstalk noise amplification circuit from the power supply on radio frequency signals is effectively prevented.
As shown in fig. 2, the radio frequency signal input terminal transmits a 2.4GHz signal to the first filter circuit, the inductor L1 is connected in parallel with the capacitor C1, and after being connected in parallel, one end is grounded, the other end is connected with the radio frequency signal input terminal, the inductor L2 and the capacitor C2, the capacitor C2 is connected with the inductors L3 and C3, wherein the inductor L3 is connected in parallel with the capacitor C3, after being connected in parallel, one end is grounded, and the other end is connected to the first noise amplifier circuit. The filter circuit is added at the front end of the low-noise amplification circuit, so that signals in a specific frequency band can be flexibly selected, signals outside the specific frequency band are filtered, and the frequency range and the signal-to-noise ratio required by rear-end signal frequency processing are met.
One end of a capacitor C4 of the first noise amplification circuit is connected with the first filter circuit, the other end of the capacitor C4 of the first noise amplification circuit is connected with a first pin of a first noise amplifier N1, a second pin and a fourth pin of the first noise amplifier N1 are grounded, a third pin of the first noise amplifier N1 is connected with an inductor L4 and a capacitor C5, one end of an inductor L4 is connected with a capacitor C5, the other end of the inductor L4 is respectively connected with a capacitor C6, a capacitor C7 and a resistor R1, and a resistor R1 is connected with a positive input end VCC of the power supply circuit, wherein the positive input end VCC of the power supply circuit is 5V, and the capacitor C5 is connected with the second noise.
In the second noise amplifying circuit, one end of a capacitor C8 is connected to a first pin of a second noise amplifier N2, the other end of the capacitor C8 is connected to a third pin of a first noise amplifier N1, a third pin of the second noise amplifier N2 is connected to an inductor L5, a second pin and a fourth pin of the second noise amplifier N2 are grounded, one end of an inductor L5 is connected to the capacitor C9, the other end of the inductor L5 is connected to a capacitor C10, a capacitor C11 and a resistor R2 respectively, the resistor R2 is connected to a positive input terminal VCC of a power supply circuit, wherein the positive input terminal VCC of the power supply circuit is 5V, the resistor R2 is pulled up to 5V, one end of the R2 is connected to 5V, the other end of the R2 is filtered by a parallel capacitor C10 and a capacitor C11 and then connected to the inductor L5, one end of the capacitor C9 is connected to the second noise amplifier N.
The utility model discloses in, through adopting two-stage noise amplification circuit, can carry out the two-stage signal to the radio frequency small signal and enlarge, guaranteed output radio frequency signal's power strength and SNR.
In a preferred embodiment, the first filter circuit is a pi-type band-pass filter circuit, and the noise amplifier N1 in the first noise amplifier circuit and the noise amplifier N2 in the second noise amplifier circuit are both low noise amplifiers SBB-3089Z.
Example 2
As shown in fig. 3, on the basis of embodiment 1, an attenuation circuit is provided at the rear end of the second noise amplification circuit, and the attenuation circuit includes a pi-type attenuator composed of a capacitor C12, a capacitor C13, a resistor R3, a resistor R4, and a resistor R5. And after the signal is output from the third pin of the second noise amplification electric appliance N2, the signal enters a pi-type attenuator. One end of the capacitor C12 is connected with the third pin of the second noise amplifier N2, one end of the capacitor C12 is connected with the resistor R3 and the resistor R4, the other end of the resistor R4 is connected with the resistor R5 and the capacitor C13, the other ends of the resistor R3 and the resistor R5 are grounded, and the other end of the capacitor C13 is connected with the signal output end.
In other technical features in this embodiment, those skilled in the art can flexibly select the technical features according to actual situations to meet different specific actual requirements. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the invention. In other instances, well-known components, structures or parts are not described in detail in order to avoid obscuring the present invention, and the technical scope of the present invention is defined by the claims.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are used in a generic sense as is understood by those skilled in the art. For example, the components may be fixedly connected, movably connected, integrally connected, or partially connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, or connected inside two elements, and the like, and for those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations, that is, the expression of the language and the implementation of the actual technology can flexibly correspond, and the expression of the language (including the drawings) of the specification of the present invention does not constitute any single restrictive interpretation of the claims.
Modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, which should be limited only by the claims appended hereto. In the previous description, numerous specific details were set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the invention. In other instances, well-known techniques, such as specific construction details, operating conditions, and other technical conditions, have not been described in detail in order to avoid obscuring the present invention.
Claims (8)
1. The utility model provides a low noise discharge circuit for interference equipment, includes first filter circuit, first noise amplification circuit, the second noise amplification circuit that connects gradually, its characterized in that: the circuit also comprises a radio frequency filter circuit and an anti-static damage circuit, wherein the radio frequency filter circuit is connected with the power input end VCC _ in.
2. A low noise discharge circuit for jamming devices according to claim 1, characterized in that: the radio frequency filter circuit comprises a first filter C21 and a second filter C22, a first pin of the first filter C21 is connected with the power supply input end VCC _ in, a second pin of the first filter C21 is connected with the positive electrode input end VCC of the power supply circuit, and a third pin of the first filter C21 is connected with the low-noise discharging circuit shell through threads and is commonly grounded; and a first pin of the second filter C22 is connected with a power supply negative electrode input end GND _ in, and a second pin of the second filter C22 is connected with the low-noise discharge circuit shell and is commonly grounded.
3. A low noise discharge circuit for jamming devices according to claim 1, characterized in that: the anti-electrostatic damage circuit comprises a first anti-electrostatic device D1, a first pin of the first anti-electrostatic device D1 is connected with the power input end VCC _ in, and a second pin of the first anti-electrostatic device D1 is grounded.
4. A low noise discharge circuit for jamming devices according to claim 1, characterized in that: the first filter circuit comprises an inductor L1, a capacitor C1, an inductor L2, a capacitor C2, an inductor L3 and a capacitor C3, wherein the inductor L1 is connected with the capacitor C1 in parallel, one end of the parallel connection is grounded, and the other end of the parallel connection is connected with a radio frequency signal input end; meanwhile, the radio frequency signal input end is connected with an inductor L2 and a capacitor C2 in series; the inductor L3 is connected in parallel with the capacitor C3, one end of the parallel inductor L3 is grounded, and the other end of the parallel inductor L3 is connected with the capacitor C2 and the first noise amplifying circuit.
5. A low noise discharge circuit for jamming devices according to claim 1, characterized in that: first noise amplification circuit includes first noise amplifier N1, first noise amplifier N1's first pin pass through electric capacity C4 with first filter circuit connects, first noise amplifier N1's second pin, fourth pin ground connection, first noise amplifier N1's third pin is connected with inductance L4 and electric capacity C5, inductance L4 one end with electric capacity C5 connects, the inductance L4 other end is connected with electric capacity C6, electric capacity C7, resistance R1 respectively, resistance R1 is connected with power supply circuit positive input VCC, electric capacity C5 is connected to second noise amplification circuit.
6. A low noise discharge circuit for jamming devices according to claim 1, characterized in that: the second noise amplification circuit comprises a second noise amplifier N2, a first pin of the second noise amplifier N2 passes through a capacitor C8 and is connected with the first noise amplification circuit, a second pin and a fourth pin of the second noise amplifier N2 are grounded, a third pin of the second noise amplifier N2 is connected with an inductor L5 and a capacitor C9, one end of the inductor L5 is connected with the capacitor C9, the other end of the inductor L5 is connected with the capacitor C10, the capacitor C11 and a resistor R2 respectively, the resistor R2 is connected with a positive input end VCC of a power supply circuit, and the capacitor C9 is connected to a radio frequency signal output end.
7. A low noise discharge circuit for jamming devices according to claim 1, characterized in that: the radio frequency noise amplifier further comprises an attenuation circuit connected with the second noise amplification circuit, and the attenuation circuit is connected to the radio frequency signal output end.
8. The low noise discharge circuit for jamming devices according to claim 7, wherein: the attenuation circuit comprises a pi-type attenuator consisting of a capacitor C12, a capacitor C13, a resistor R3, a resistor R4 and a resistor R5, one end of the capacitor C12 is connected with a third pin of a second noise amplifier N2, the other end of the capacitor C12 is connected with the resistor R3 and the resistor R4, the other end of the resistor R4 is connected with the resistor R5 and the capacitor C13, the other ends of the resistor R3 and the resistor R5 are grounded, and the other end of the capacitor C13 is connected to a radio-frequency signal output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020065513.1U CN211606496U (en) | 2020-01-13 | 2020-01-13 | Low-noise discharge circuit for interference equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020065513.1U CN211606496U (en) | 2020-01-13 | 2020-01-13 | Low-noise discharge circuit for interference equipment |
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| Publication Number | Publication Date |
|---|---|
| CN211606496U true CN211606496U (en) | 2020-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020065513.1U Active CN211606496U (en) | 2020-01-13 | 2020-01-13 | Low-noise discharge circuit for interference equipment |
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| Country | Link |
|---|---|
| CN (1) | CN211606496U (en) |
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- 2020-01-13 CN CN202020065513.1U patent/CN211606496U/en active Active
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