80M-6G filter for immunity test

Abstract

The utility model relates to the technical field of electronic component testing, in particular to a 80M-6G filter for immunity testing, which comprises a signal amplification module, a high-pass filtering module and a low-pass filtering module which are sequentially in telecommunication connection, and the signal amplification module comprises an operational amplifier U1, an operational amplifier U2 and an operational amplifier U3. The operational amplifier U1 and the peripheral circuit thereof form a pre-amplification circuit, the operational amplifier U2 and the peripheral circuit thereof form a compensation network, and the operational amplifier U3 and the peripheral circuit thereof form a post-amplification circuit. According to the utility model, the pre-amplification circuit, the compensation network and the post-amplification circuit in the signal amplification module can amplify signals and reduce circuit noise, and the filtering function is realized through the subsequent high-pass filtering module and low-pass filtering module, so that the signal strength is ensured, interference signals are filtered, and the practicability is stronger.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic parts test technical field, concretely relates to a filter for 80M-6G immunity test. BACKGROUND

[0002] In today's high-speed development electronic information era, the number of various electronic equipment shows explosive growth, and its working frequency range is increasingly extensive, and the frequency band from 80M to 6G covers many important communication, electronic equipment operating frequency band, and immunity test is crucial to ensure the stable operation of electronic equipment in complex electromagnetic environment.

[0003] On the one hand, with the continuous progress of communication technology, wireless communication, Internet of Things, 5G and future 6G technology develop rapidly, and the electromagnetic environment of electronic equipment becomes more and more complex, various different frequency signals interfere with each other, which may cause device performance degradation, misoperation or even failure. Therefore, a filter capable of effectively filtering interference signals is needed to ensure that the device can accurately reflect its anti-interference ability during testing. On the other hand, in the immunity test, accurate control and monitoring of signal strength is the key, however, in the actual test environment, due to the loss in the signal transmission process and the influence of various interference factors, the signal strength may weaken, in order to ensure the accuracy and reliability of the test, the signal needs to be amplified. Adding a signal amplification module can effectively enhance the strength of the input signal, so that it can maintain sufficient strength after passing through the filter for subsequent testing and analysis.

[0004] In summary, in order to meet the needs of 80M-6G frequency band electronic equipment immunity test, a filter with signal amplification function is needed, which can not only effectively filter interference signals, but also ensure signal strength, and provide more accurate and reliable protection for electronic equipment immunity test. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a filter for 80M-6G immunity test, to solve the problems raised in the above background technology.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] The application discloses a filter for 80M-6G anti-interference test, which comprises a signal amplification module, a high-pass filter module and a low-pass filter module which are connected in sequence, wherein the signal amplification module comprises resistors R1, R2, R3, R4, R5, R6, R7, capacitors C1, C2, C3, C4, C5, operational amplifiers U1, U2 and U3; the operational amplifier U1 and its peripheral circuit constitute a pre-amplification circuit; the operational amplifier U2 and its peripheral circuit constitute a compensation network; and the operational amplifier U3 and its peripheral circuit constitute a post-amplification circuit.

[0008] The first end of the resistor R1 is connected with an input signal, the second end of the resistor R1 is connected with the first end of the resistor R2, the first end of the capacitor C2 is connected with the ground, the second end of the capacitor C2 is connected with the second end of the resistor R1, the second end of the resistor R2 is connected with the first end of the resistor R3, the second end of the resistor R3 is connected with the first end of the capacitor C3, the second end of the capacitor C3 is connected with the inverting input terminal of the operational amplifier U2, the output terminal of the operational amplifier U2 is connected with the second end of the resistor R2, the first end of the resistor R4 is connected with the inverting input terminal of the operational amplifier U2, the second end of the resistor R4 is connected with the ground, the first end of the capacitor C4 is connected with the non-inverting input terminal of the operational amplifier U2, the second end of the capacitor C4 is connected with the ground, the first end of the resistor R5 is connected with the output terminal of the operational amplifier U1, the second end of the resistor R5 is connected with the non-inverting input terminal of the operational amplifier U2, the inverting input terminal of the operational amplifier U1 is connected with the first end of the resistor R1, the non-inverting input terminal of the operational amplifier U1 is connected with the ground, the first end of the capacitor C1 is connected with the inverting input terminal of the operational amplifier U1, the second end of the capacitor C1 is connected with the output terminal of the operational amplifier U1, the output terminal of the operational amplifier U1 is connected with the first end of the capacitor C5, the second end of the capacitor C5 is connected with the inverting input terminal of the operational amplifier U3, the non-inverting input terminal of the operational amplifier U3 is connected with the ground, the output terminal of the operational amplifier U3 is connected with the first end of the resistor R7, the second end of the resistor R7 is used as the output terminal of the signal amplification module, the first end of the resistor R6 is connected with the inverting input terminal of the operational amplifier U3, and the second end of the resistor R6 is connected with the output terminal of the operational amplifier U3.

[0009] Preferably, the input terminal of the high-pass filter module is connected with the output terminal of the signal amplification module, and the high-pass filter module comprises a capacitor C6 and an inductor L1.

[0010] The first end of the capacitor C6 is used as the input terminal of the high-pass filter module, the second end of the capacitor C6 is used as the output terminal of the high-pass filter module, the first end of the inductor L1 is connected with the second end of the capacitor C6, and the second end of the inductor L1 is connected with the ground.

[0011] Preferably, the input terminal of the low-pass filter module is connected with the output terminal of the high-pass filter module, and the low-pass filter module comprises an inductor L2 and a capacitor C7.

[0012] The first end of the inductor L2 is used as the input end of the low-pass filter module, the second end of the inductor L2 is used as the output end of the low-pass filter module, the first end of the capacitor C7 is connected to the second end of the inductor L2, and the second end of the capacitor C7 is connected to the ground.

[0013] Compared with the prior art, the utility model has the beneficial effects that:

[0014] The preamplification circuit, the compensation network and the postamplification circuit in the signal amplification module can amplify signals and reduce circuit noise, and the subsequent high-pass filter module and low-pass filter module realize the filtering function, which ensures the signal strength and filters out interference signals, and is more practical. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the whole structure schematic diagram of utility model;

[0016] Figure 2 It is the circuit diagram of signal amplification module in utility model;

[0017] Figure 3 It is the circuit diagram of high-pass filter module in utility model;

[0018] Figure 4 It is the circuit diagram of low-pass filter module in utility model;

[0019] In the drawing:

[0020] 1, signal amplification module;

[0021] 2, high-pass filter module;

[0022] 3, low-pass filter module. DETAILED DESCRIPTION

[0023] The technical solutions in the utility model will be clearly and completely described below with reference to the drawings in the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0024] Please refer to Figures 1-4 The utility model provides technical schemes:

[0025] The utility model relates to a filter for 80M-6G anti-interference test, including signal amplification module 1, high pass filter module 2 and low pass filter module 3 that are connected in turn, signal amplification module 1 includes resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, operational amplifier U1, operational amplifier U2 and operational amplifier U3, and operational amplifier U1 and its peripheral circuit constitute preamplifier circuit, operational amplifier U2 and its peripheral circuit constitute compensation network, reduce circuit noise, improve system bandwidth, and operational amplifier U3 and its peripheral circuit constitute postamplifier circuit.

[0026] The first end of resistance R1 is connected to an input signal, the second end of resistance R1 is connected to the first end of resistance R2, the first end of capacitor C2 is connected to ground, the second end of capacitor C2 is connected to the second end of resistance R1, the second end of resistance R2 is connected to the first end of resistance R3, the second end of resistance R3 is connected to the first end of capacitor C3, the second end of capacitor C3 is connected to the inverting input of operational amplifier U2, the output of operational amplifier U2 is connected to the second end of resistance R2, the first end of resistance R4 is connected to the inverting input of operational amplifier U2, the second end of resistance R4 is connected to ground, the first end of capacitor C4 is connected to the non-inverting input of operational amplifier U2, the second end of capacitor C4 is connected to ground, the first end of resistance R5 is connected to the output of operational amplifier U1, the second end of resistance R5 is connected to the non-inverting input of operational amplifier U2, the inverting input of operational amplifier U1 is connected to the first end of resistance R1, the non-inverting input of operational amplifier U1 is connected to ground, the first end of capacitor C1 is connected to the inverting input of operational amplifier U1, the second end of capacitor C1 is connected to the output of operational amplifier U1, the output of operational amplifier U1 is connected to the first end of capacitor C5, the second end of capacitor C5 is connected to the inverting input of operational amplifier U3, the non-inverting input of operational amplifier U3 is connected to ground, the output of operational amplifier U3 is connected to the first end of resistance R7, the second end of resistance R7 serves as the output of signal amplification module 1, the first end of resistance R6 is connected to the inverting input of operational amplifier U3, the second end of resistance R6 is connected to the output of operational amplifier U3, resistance R5 and capacitor C4 constitute a low pass filter, resistance R2 and capacitor C2 also constitute a low pass filter, for further filtering noise and AC components in the feedback circuit, the preamplifier circuit and the postamplifier circuit can further amplify the input signal.

[0027] In the embodiment, the input of high pass filter module 2 is connected to the output of signal amplification module 1, and high pass filter module 2 includes capacitor C6 and inductor L1.

[0028] The first end of the capacitor C6 is the input end of the high-pass filtering module 2, the second end of the capacitor C6 is the output end of the high-pass filtering module 2, the first end of the inductor L1 is connected with the second end of the capacitor C6, the second end of the inductor L1 is grounded, and the cut-off frequency is 80Mhz; when the signal is in a low frequency band, the inductive reactance of the inductor L1 is large, the capacitive reactance of the capacitor C6 is small, the signal is mainly transmitted through the capacitor C6, and the inductor L1 has a large hindering effect on the low frequency signal, so that the low frequency signal is attenuated; when the signal is in a high frequency band, the inductive reactance of the inductor L1 is small, the capacitive reactance of the capacitor C6 is large, the signal is mainly transmitted through the inductor L1, and the capacitor C6 has a large hindering effect on the high frequency signal, so that the high frequency signal is transmitted.

[0029] In addition, the input end of the low-pass filtering module 3 is connected with the output end of the high-pass filtering module 2, and the low-pass filtering module 3 comprises an inductor L2 and a capacitor C7.

[0030] The first end of the inductor L2 is the input end of the low-pass filtering module 3, the second end of the inductor L2 is the output end of the low-pass filtering module 3, the first end of the capacitor C7 is connected with the second end of the inductor L2, and the second end of the capacitor C7 is grounded; and the cut-off frequency is 6Ghz; when the signal is in a low frequency band, the inductive reactance of the inductor L2 is small, the capacitive reactance of the capacitor C7 is large, the signal is mainly transmitted through the inductor L2, and the capacitor C7 has a small hindering effect on the low frequency signal, so that the low frequency signal is transmitted; when the signal is in a high frequency band, the inductive reactance of the inductor L2 is large, the capacitive reactance of the capacitor C7 is small, the signal is mainly transmitted through the capacitor C7, and the inductor L2 has a large hindering effect on the high frequency signal, so that the high frequency signal is attenuated.

[0031] In use, the operational amplifier U1 and the peripheral circuit thereof constitute a preamplification circuit, the operational amplifier U2 and the peripheral circuit thereof constitute a compensation network, the compensation network is used to replace common resistance feedback and capacitor feedback, the resistance R5 and the capacitor C4 in the compensation network constitute a low-pass filter, the resistance R2 and the capacitor C2 in the compensation network also constitute a low-pass filter, and the low-pass filter is used for further filtering noise in a feedback circuit, the operational amplifier U3 and the peripheral circuit thereof constitute a postamplification circuit, and then the signal sequentially passes through the high-pass filtering module 2 and the low-pass filtering module 3, so that the signal amplification and filtering are completed, and the practicability is higher.

[0032] The basic principle, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A filter for 80M-6G immunity testing, characterized by: The signal amplification module (1), the high-pass filter module (2) and the low-pass filter module (3) are connected in sequence, the signal amplification module (1) comprises resistors R1, R2, R3, R4, R5, R6, R7, capacitors C1, C2, C3, C4, C5, operational amplifiers U1, U2 and U3, the operational amplifier U1 and its peripheral circuit constitute a preamplifier circuit, the operational amplifier U2 and its peripheral circuit constitute a compensation network, and the operational amplifier U3 and its peripheral circuit constitute a postamplifier circuit; The first end of the resistor R1 is connected to an input signal, the second end of the resistor R1 is connected to the first end of the resistor R2, the first end of the capacitor C2 is connected to ground, the second end of the capacitor C2 is connected to the second end of the resistor R1, the second end of the resistor R2 is connected to the first end of the resistor R3, the second end of the resistor R3 is connected to the first end of the capacitor C3, the second end of the capacitor C3 is connected to the inverting input terminal of the operational amplifier U2, the output terminal of the operational amplifier U2 is connected to the second end of the resistor R2, the first end of the resistor R4 is connected to the inverting input terminal of the operational amplifier U2, the second end of the resistor R4 is connected to ground, the first end of the capacitor C4 is connected to the non-inverting input terminal of the operational amplifier U2, the second end of the capacitor C4 is connected to ground, the first end of the resistor R5 is connected to the output terminal of the operational amplifier U1, the second end of the resistor R5 is connected to the non-inverting input terminal of the operational amplifier U2, the inverting input terminal of the operational amplifier U1 is connected to the first end of the resistor R1, the non-inverting input terminal of the operational amplifier U1 is connected to ground, the first end of the capacitor C1 is connected to the inverting input terminal of the operational amplifier U1, the second end of the capacitor C1 is connected to the output terminal of the operational amplifier U1, the output terminal of the operational amplifier U1 is connected to the first end of the capacitor C5, the second end of the capacitor C5 is connected to the inverting input terminal of the operational amplifier U3, the non-inverting input terminal of the operational amplifier U3 is connected to ground, the output terminal of the operational amplifier U3 is connected to the first end of the resistor R7, the second end of the resistor R7 serves as the output terminal of the signal amplification module (1), the first end of the resistor R6 is connected to the inverting input terminal of the operational amplifier U3, and the second end of the resistor R6 is connected to the output terminal of the operational amplifier U3.

2. The filter for 80M-6G immunity test according to claim 1, characterized in that: The input terminal of the high-pass filter module (2) is connected to the output terminal of the signal amplification module (1), and the high-pass filter module (2) comprises a capacitor C6 and an inductor L1. The first end of the capacitor C6 serves as the input terminal of the high-pass filter module (2), the second end of the capacitor C6 serves as the output terminal of the high-pass filter module (2), the first end of the inductor L1 is connected to the second end of the capacitor C6, and the second end of the inductor L1 is connected to ground.

3. The filter for 80M-6G immunity test according to claim 1, wherein: The input terminal of the low-pass filter module (3) is connected to the output terminal of the high-pass filter module (2), and the low-pass filter module (3) comprises an inductor L2 and a capacitor C7. The first end of the inductor L2 serves as the input terminal of the low-pass filter module (3), the second end of the inductor L2 serves as the output terminal of the low-pass filter module (3), the first end of the capacitor C7 is connected to the second end of the inductor L2, and the second end of the capacitor C7 is connected to ground.

Images