Electrostatic discharge protection circuit and low noise amplification module

Abstract

The utility model provides a kind of electrostatic discharge protection circuit and low noise amplification module, the electrostatic discharge protection circuit is applied to low noise amplification circuit, the low noise amplification circuit includes input matching circuit and the low noise amplifier of the output end being connected to the input matching circuit;The electrostatic discharge protection circuit includes inductance and resistance;The first end of the inductance is used to connect to the signal input end of low noise amplifier;The first end of the resistance is connected to the second end of the inductance, and the second end of the resistance is grounded.The electrostatic discharge protection circuit in the utility model is connected to the input end of low noise amplifier, and the noise coefficient of low noise amplifier will not be deteriorated, and the performance of low noise amplifier will not be affected, and the input stability of low noise amplifier will not be affected simultaneously.

Description

TECHNICAL FIELD

[0001] The utility model relates to wireless communication technical field especially relates to a kind of electrostatic discharge protection circuit and low noise amplification module. BACKGROUND

[0002] Electrostatic discharge (ESD) protection technology mainly uses diode, resistance, capacitor transient voltage suppression diode (TVS), silicon controlled rectifier (SCR), bipolar junction transistor (BJT) and field effect transistor (MOS tube) and other electronic components are realized.

[0003] As shown in Figure 1 The electrostatic discharge protection circuit 100 in prior art mainly adopts multiple diodes (D1, D2, D3, D4) to be connected to the input end of the low noise amplifier 101, and the specific connection is between the matching inductance LG1 and the matching capacitor C1 of the input matching of the low noise amplifier 101, so as to introduce the transient current generated by electrostatic discharge into the ground through multiple diodes, so as to protect the electronic equipment using the low noise amplifier 101 from damage.

[0004] However, the above electrostatic discharge protection circuit 100 uses diodes, so it will introduce parasitic capacitance at the input end of the low noise amplifier 101, which will pull the input matching of the chip, thus deteriorating the noise figure of the low noise amplifier 101, and the above electrostatic discharge protection circuit 100 itself will also generate corresponding noise and nonlinearity, which will further affect the performance of the low noise amplifier 101. UTILITY MODEL CONTENTS

[0005] In view of the above problems of prior art, the utility model provides a new electrostatic discharge protection circuit and low noise amplification module to solve the problem that the electrostatic discharge protection circuit in prior art connected to the input end of the low noise amplifier will deteriorate the noise figure of the low noise amplifier and affect the performance of the low noise amplifier.

[0006] In order to solve the above technical problems, in the first aspect, the utility model provides an electrostatic discharge protection circuit applied to a low noise amplification circuit, the low noise amplification circuit includes an input matching circuit and a low noise amplifier connected to the output end of the input matching circuit, the first input end of the input matching circuit is used to connect the radio frequency signal, and the output end of the input matching circuit is connected to the input end of the low noise amplifier; the electrostatic discharge protection circuit includes an inductor and a resistor; the first end of the inductor is used to connect to the second input end of the input matching circuit; the first end of the resistor is connected to the second end of the inductor, and the second end of the resistor is grounded.

[0007] Preferably, the electrostatic discharge protection circuit further comprises a first diode and a second diode; the positive pole of the first diode and the negative pole of the second diode are respectively connected to the second input end of the input matching circuit; the first end of the inductor is respectively connected to the negative pole of the first diode and the positive pole of the second diode.

[0008] Preferably, the resistance has a resistance value of 2-10Ω.

[0009] Preferably, the input matching circuit comprises a matching inductor and a matching capacitor; the first end of the matching inductor serves as the first input end of the input matching circuit, and the second end of the matching inductor serves as the second input end of the input matching circuit; the first end of the capacitor is connected to the second end of the matching inductor, and the second end of the capacitor serves as the output end of the input matching circuit.

[0010] In a second aspect, the utility model provides a low noise amplification module, it includes the linear voltage stabilizer as above.

[0011] Compared with the prior art, the electrostatic discharge protection circuit of the utility model is composed of an inductor and a resistor, so it does not have a diode, and the corresponding parasitic capacitor is also eliminated. If it is connected to the second input end of the input matching circuit of the low noise amplification circuit, it will not deteriorate the noise factor of the low noise amplification circuit. Since there is no diode, the nonlinearity generated by the electrostatic discharge protection circuit will not affect the performance of the low noise amplification circuit. In addition, the resistor can also prevent the ground signal reflection caused by the inductor, so as not to affect the input stability of the low noise amplification circuit. BRIEF DESCRIPTION OF DRAWINGS

[0012] The utility model will be described in detail below in combination with the drawings. The above or other aspects of the utility model will become clearer and more easily understood through the following detailed description in combination with the drawings. In the drawings:

[0013] Figure 1 a circuit principle diagram for the electrostatic discharge protection circuit provided by the prior art connected to the input end of the low noise amplifier;

[0014] Figure 2 a circuit principle diagram for the electrostatic discharge protection circuit provided by the utility model embodiment one connected to the second input end of the input matching circuit of the low noise amplification circuit;

[0015] Figure 3 a circuit principle diagram for the electrostatic discharge protection circuit provided by the utility model embodiment two connected to the second input end of the input matching circuit of the low noise amplification circuit. DETAILED DESCRIPTION

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application; the use herein of terms such as "comprise", "have" and "include" or variations such as "comprises", "comprising", "includes" and "including", is intended to be read expansively and without limitation; and the use herein of terms such as "first", "second", and "third" or variations thereof is intended to be read as "first", "second", and "third" only and not as a description of an order or sequence.

[0017] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all referring to a common embodiment, or an embodiment that is independent of all other embodiments. One of ordinary skill in the art will readily recognize from the disclosure herein, that embodiments of the present application can be combined with embodiments of the other applications.

[0018] The technical solutions in the embodiments of the present application will be apparently and completely described in connection with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without any creative labor are within the protection scope of the present application.

[0019] Embodiment one

[0020] The embodiment of the present application provides a static discharge protection circuit 200, as shown in the figure, which comprises an inductor Lesd and a resistor Resd; the first end of the inductor Lesd is used for connecting to the second input end of the input matching circuit 301; the first end of the resistor Resd is connected to the second end of the inductor Lesd, and the second end of the resistor Resd is grounded. Figure 1

[0021] The static discharge protection circuit 200 is applied to a low-noise amplification circuit 300, the low-noise amplification circuit 300 comprises an input matching circuit 301 and a low-noise amplifier 302 connected to the output end of the input matching circuit 301, the first input end of the input matching circuit 301 is used for connecting a radio frequency signal RF, and the output end of the input matching circuit 301 is connected to the input end of the low-noise amplifier 302.

[0022] ​The input matching circuit 301 comprises a matching inductor LG and a matching capacitor C; a first end of the matching inductor LG is used as a first input end of the input matching circuit 301, and a second end of the matching inductor LG is used as a second input end of the input matching circuit 301; a first end of the capacitor C is connected to the second end of the matching inductor LG, and a second end of the capacitor C is used as an output end of the input matching circuit 301.

[0023] No matter whether the low-noise amplification circuit 300 inputs a positive voltage or a negative voltage, static electricity can be directly discharged to the ground through the inductor Lesd, and the discharging speed is fast. In order to ensure the performance of the low-noise amplification circuit 300, it is necessary to ensure that the henry value of the inductor Lesd is large enough.

[0024] The ground signal reflection caused by the inductor Lesd can affect the input stability of the low-noise amplification circuit 300, and the purpose of the resistor Resd is to prevent the ground signal reflection caused by the inductor Lesd, so that the input stability of the low-noise amplification circuit 300 is not affected; accordingly, the resistance value of the resistor Resd should not be too large, and is generally set to 2-10Ω.

[0025] Compared with the prior art, the static electricity discharge protection circuit 200 of the embodiment is composed of the inductor Lesd and the resistor Resd, so it does not have a diode, and the corresponding parasitic capacitor is also eliminated. If it is connected to the second input end of the input matching circuit 301 of the low-noise amplification circuit 300, it will not worsen the noise factor of the low-noise amplification circuit 300. Since there is no diode, the nonlinearity generated by the static electricity discharge protection circuit 200 will not affect the performance of the low-noise amplification circuit 300. In addition, the resistor Resd can also prevent the ground signal reflection caused by the inductor Lesd, so that the input stability of the low-noise amplification circuit 300 is not affected.

[0026] Embodiment Two

[0027] The difference between the embodiment and the above-mentioned embodiment one is that, as shown in Figure 2 The static electricity discharge protection circuit 200 further comprises a first diode D1 and a second diode D2; the anode of the first diode D1 and the cathode of the second diode D2 are respectively used for being connected to the second input end of the input matching circuit 301; the first end of the inductor Lesd is respectively connected to the cathode of the first diode D1 and the anode of the second diode D2, which is equivalent to that the inductor Lesd is indirectly connected to the second input end of the input matching circuit 301 through the first diode D1 and the second diode D2.

[0028] If the low-noise amplification circuit 300 inputs a positive voltage, the first diode D1 is turned on, and then the static electricity is discharged to the ground through the inductor Lesd; if the low-noise amplification circuit 300 inputs a negative voltage, the second diode D2 is turned on, and then the static electricity is discharged to the ground through the inductor Lesd.

[0029] Since the inductor Lesd can compensate for the parasitic capacitance of the first diode D1 and the second diode D2, the influence of the electrostatic discharge protection circuit 200 on the noise figure of the low noise amplification circuit 300 can be reduced; meanwhile, the inductive reactance of the inductor Lesd can weaken the non-linear characteristics of the electrostatic discharge protection circuit 200 to avoid its influence on the performance of the low noise amplification circuit 300.

[0030] Embodiment three

[0031] The embodiment provides a low noise amplification module, which comprises the electrostatic discharge protection circuit 200 in the above embodiment one or embodiment two.

[0032] Since the low noise amplification module in the embodiment comprises the electrostatic discharge protection circuit 200 in the above embodiment one or embodiment two, the technical effects achieved by the electrostatic discharge protection circuit 200 in the above embodiment one or embodiment two can also be achieved, which will not be described herein.

[0033] It should be noted that the above various embodiments described with reference to the accompanying drawings are only used to illustrate the present application and not to limit the scope of the present application, and those skilled in the art should understand that the modifications or equivalent replacements made to the present application without departing from the spirit and scope of the present application should be covered within the scope of the present application. In addition, unless otherwise indicated by the context, the word appearing in the singular form includes the plural form, and vice versa. In addition, unless specifically stated, all or part of any embodiment can be used in combination with all or part of any other embodiment.

Claims

1. An electrostatic discharge protection circuit applied to a low noise amplifier circuit, the low noise amplifier circuit comprising an input matching circuit and a low noise amplifier connected to an output end of the input matching circuit, a first input end of the input matching circuit being used for connecting a radio frequency signal, an output end of the input matching circuit being connected to an input end of the low noise amplifier; characterized in that, The electrostatic discharge protection circuit comprises an inductor and a resistor; a first end of the inductor is connected to a second input end of the input matching circuit; a first end of the resistor is connected to a second end of the inductor, and a second end of the resistor is grounded.

2. The electrostatic discharge protection circuit of claim 1, wherein, The electrostatic discharge protection circuit further comprises a first diode and a second diode; an anode of the first diode and a cathode of the second diode are respectively connected to the second input end of the input matching circuit; and a first end of the inductor is respectively connected to a cathode of the first diode and an anode of the second diode.

3. The electrostatic discharge protection circuit of claim 1 or 2, wherein, The resistance value of the resistor is 2-10Ω.

4. The electrostatic discharge protection circuit of claim 1 or 2, wherein, The input matching circuit comprises a matching inductor and a matching capacitor; a first end of the matching inductor serves as a first input end of the input matching circuit, and a second end of the matching inductor serves as a second input end of the input matching circuit; a first end of the capacitor is connected to the second end of the matching inductor, and a second end of the capacitor serves as an output end of the input matching circuit.

5. A low noise amplification module, characterized by, The low-noise amplification module comprises the electrostatic discharge protection circuit according to any one of claims 1-4.

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