CN216670093U - Signal isolator and signal test system - Google Patents
Signal isolator and signal test system Download PDFInfo
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- CN216670093U CN216670093U CN202123073964.3U CN202123073964U CN216670093U CN 216670093 U CN216670093 U CN 216670093U CN 202123073964 U CN202123073964 U CN 202123073964U CN 216670093 U CN216670093 U CN 216670093U
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Abstract
The signal isolator comprises an input impedance matching unit, an input blocking unit, an operational amplification unit, an output blocking unit and an output impedance matching unit, or comprises an input impedance matching unit, an input blocking unit, an operational amplification unit, an output blocking unit, an output impedance matching unit and a high impedance unit; through utilizing the characteristic that the signal of operation amplification unit output itself does not return the input, realize the signal isolation function, can realize being surveyed when the signal isolator is applied to AISG signal test system the effective isolation between product and the band-pass filter that central frequency is 4.352MHz, improve the accuracy and the small in size of test result.
Description
Technical Field
The application belongs to the technical field of Antenna Interface Standard Group (AISG) signal testing, and particularly relates to a signal isolator and a signal testing system.
Background
When the AISG signal test is carried out, according to the AISG protocol requirement, the AISG signal needs to be subjected to the harmonic test. In a conventional test method, a signal source is generally used to generate an AISG signal with a center frequency of 2.176MHz, and a detector is used to measure harmonics. In a low-cost test method, 2.176MHz AISG signals generated by a signal source sequentially pass through a 2.176MHz band-pass filter, a tested product, a signal isolator and a 4.352MHz band-pass filter, then are output to a detector to carry out 4.352MHz second harmonic power detection, and a computer queries a calibrated power voltmeter to obtain the power of the second harmonic, so that 4.352MHz second harmonic in 2.176MHz AISG signals is measured. Existing signal isolators are typically made of ferrite materials, require customization, are expensive, and are bulky.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a signal isolator and a signal testing system, and aims to solve the problems that an existing signal isolator is usually made of ferrite materials, needs to be customized, and is high in price and large in size.
A first aspect of an embodiment of the present application provides a signal isolator, including an input impedance matching unit, an input blocking unit, an operational amplification unit, an output blocking unit, and an output impedance matching unit;
the input end of the input impedance matching unit is electrically connected with the input end of the input blocking unit to form the input end of the signal isolator, and the output end of the input impedance matching unit is grounded;
the output end of the input blocking unit is electrically connected with the non-inverting input end of the operational amplification unit;
the inverting input end of the operational amplification unit is electrically connected with the output end of the operational amplification unit and the input end of the output blocking unit, and the positive power supply end of the operational amplification unit is used for being connected with a positive power supply;
the output end of the output blocking unit is electrically connected with the input end of the output impedance matching unit;
the output end of the output impedance matching unit forms the output end of the signal isolator;
the negative power supply end of the operational amplification unit is used for accessing a negative power supply; or, the signal isolator further includes a high impedance unit, a negative power end of the operational amplification unit is grounded, an input end of the high impedance unit is used for being connected to the positive power supply, a first output end of the high impedance unit is electrically connected with an output end of the input blocking unit and a non-inverting input end of the operational amplification unit, and a second output end of the high impedance unit is grounded.
In one embodiment, the input impedance matching unit includes a first impedance matching resistor, and the output impedance matching unit includes a second impedance matching resistor;
the first end and the second end of the first impedance matching resistor respectively form an input end and an output end of the input impedance matching unit;
the first end and the second end of the second impedance matching resistor respectively form the input end and the output end of the output impedance matching unit.
In one embodiment, the input dc blocking unit comprises a first dc blocking capacitance, and the output dc blocking unit comprises a second dc blocking capacitance;
the first end and the second end of the first blocking capacitor respectively form the input end and the output end of the input blocking unit;
and the first end and the second end of the second blocking capacitor respectively form the input end and the output end of the output blocking unit.
In one embodiment, the first dc blocking capacitance and the second dc blocking capacitance are nanofarad-scale capacitances.
In one embodiment, the operational amplification unit includes an operational amplifier;
the non-inverting input end, the positive power end, the negative power end and the output end of the operational amplifier respectively form the non-inverting input end, the positive power end, the negative power end and the output end of the operational amplifier unit.
In one embodiment, the operational amplification unit further comprises a feedback resistor, a damping resistor and a damping capacitor;
the feedback resistor is electrically connected between the inverting input end and the output end of the operational amplifier;
the damping resistor and the damping capacitor are connected in series between the inverting input end of the operational amplifier and the ground.
In one embodiment, the high impedance unit includes a first high impedance resistance and a second high impedance resistance;
the first end of the first high-impedance resistor forms the input end of the high-impedance unit, the second end of the first high-impedance resistor and the first end of the second high-impedance resistor are electrically connected to form the first output end of the high-impedance unit, and the second end of the second high-impedance resistor forms the second output end of the high-impedance unit.
In one embodiment, the first high impedance resistor and the second high impedance resistor are resistors of the order of 10K Ω.
In one embodiment, the signal isolator further comprises a decoupling capacitance unit;
the decoupling capacitor unit is connected in series between a positive power supply end of the operational amplification unit and the ground.
A second aspect of the present application provides a signal testing system, including a signal source, a first band pass filter, a product to be tested, a signal isolator, a second band pass filter and a testing device, which are electrically connected in sequence;
the signal source is used for generating an antenna interface standard organization signal with the center frequency of 2.176MHz, the center frequency of the first band-pass filter is 2.176MHz, the input end and the output end of the signal isolator are respectively electrically connected with the product to be tested and the second band-pass filter, and the center frequency of the second band-pass filter is 4.352 MHz.
A signal isolator provided in a first aspect of an embodiment of the present application includes an input impedance matching unit, an input blocking unit, an operational amplification unit, an output blocking unit, and an output impedance matching unit; the input end of the input impedance matching unit is electrically connected with the input end of the input blocking unit to form the input end of the signal isolator, and the output end of the input impedance matching unit is grounded; the input end of the input blocking unit is electrically connected with the non-inverting input end of the operational amplification unit; the inverting input end of the operational amplification unit is electrically connected with the output end of the operational amplification unit and the input end of the output blocking unit, and the positive power supply end of the operational amplification unit is used for being connected with a positive power supply; the output end of the output blocking unit is electrically connected with the input end of the output impedance matching unit; the output end of the output impedance matching unit forms the output end of the signal isolator; the negative power supply end of the operational amplification unit is used for accessing a negative power supply; or, the signal isolator also comprises a high-impedance unit, the negative power end of the operational amplification unit is grounded, the input end of the high-impedance unit is used for being connected with a positive power supply, the first output end of the high-impedance unit is electrically connected with the output end of the input blocking unit and the in-phase input end of the operational amplification unit, the second output end of the high-impedance unit is grounded, the signal isolation function is realized by utilizing the characteristic that the signal output by the operational amplification unit does not return to the input end, when the signal isolator is applied to an AISG signal test system, the tested product and the band-pass filter with the center frequency of 4.352MHz are effectively isolated, and the accuracy and the size of a test result are improved.
It is understood that the beneficial effects of the second aspect can be referred to the related description of the first aspect, and are not described herein again.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic diagram of a first structure of a signal isolator according to an embodiment of the present application;
fig. 2 is a schematic diagram of a second structure of a signal isolator according to an embodiment of the present application;
fig. 3 is a schematic diagram of a third structure of a signal isolator according to an embodiment of the present application;
FIG. 4 is a first circuit schematic diagram of a signal isolator provided by an embodiment of the present application;
FIG. 5 is a second circuit schematic diagram of a signal isolator provided by an embodiment of the present application;
FIG. 6 is a third circuit schematic diagram of a signal isolator according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a signal testing system according to an embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
As used in this specification and the appended claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to" determining "or" in response to detecting ". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".
Furthermore, in the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used for distinguishing between descriptions and not necessarily for describing or implying relative importance.
Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise. "plurality" means two or more.
As shown in fig. 1, an embodiment of the present application provides a signal isolator 10, which includes an input impedance matching unit 1, an input blocking unit 2, an operational amplification unit 3, an output blocking unit 4, and an output impedance matching unit 5;
the input end of the input impedance matching unit 1 is electrically connected with the input end of the input blocking unit 2 to form the input end of the signal isolator 10, and the output end of the input impedance matching unit 2 is grounded;
the output end of the input blocking unit 2 is electrically connected with the non-inverting input end of the operational amplification unit 3;
the inverting input end of the operational amplification unit 3 is electrically connected with the output end of the operational amplification unit 3 and the input end of the output blocking unit 4, and the positive power supply end of the operational amplification unit 3 is used for being connected with a positive power supply VCC +;
the output end of the output blocking unit 2 is electrically connected with the input end of the output impedance matching unit 5;
the output end of the output impedance matching unit 5 forms the output end of the signal isolator 10;
the negative power supply end of the operational amplification unit 3 is used for being connected with a negative power supply VCC-.
In an application, the input impedance matching unit and the output impedance matching unit may be implemented by at least one impedance matching resistor. When the input impedance matching unit and the output impedance matching unit are realized by a plurality of impedance matching resistors, the plurality of impedance matching resistors can be connected in series, in parallel or in series-parallel mixed connection, and the equivalent resistance values of the plurality of impedance matching resistors are ensured to meet the design requirements. For example, when the signal isolator is applied to the AISG signal testing system, the equivalent resistance value of the at least one impedance matching resistor may be designed to be 50 Ω.
In application, the input blocking unit and the output blocking unit may be implemented by at least one blocking capacitor. When the input blocking unit and the output blocking unit are realized through a plurality of blocking capacitors, the blocking capacitors are connected in series. When the signal isolator is applied to the AISG signal test system, the blocking capacitor can be designed into a nano-scale capacitor according to the frequency of the AISG signal.
In application, the operational amplification unit may be implemented by an operational amplifier, or an operational amplifier and its peripheral circuits. When the operational amplification unit is realized only by the operational amplifier, the operational amplification unit only has a signal isolation function; when the operational amplification unit is implemented by an operational amplifier and its peripheral circuits (e.g., feedback resistors), it has both a signal isolation function and a signal amplification function.
The signal isolator provided by the embodiment of the application realizes the one-way transmission function of the signal, namely, the signal isolation function by utilizing the characteristic that the signal output by the operational amplification unit does not return to the input end.
As shown in fig. 2, in one embodiment, the signal isolator 10 further comprises a high impedance unit 6;
the negative power supply end of the operational amplification unit 3 is changed from being connected with a negative power supply VCC-to being grounded;
the input end of the high-impedance unit 6 is used for being connected with a positive power supply VCC +, the first output end of the high-impedance unit 6 is electrically connected with the output end of the input blocking unit 2 and the non-inverting input end of the operational amplification unit 3, and the second output end of the high-impedance unit 6 is grounded.
In application, the high impedance unit may be implemented by at least two high impedance resistors (i.e. resistors with higher impedance), and the high impedance resistors are divided into two groups with the same equivalent resistance value to implement the halving of the positive power supply, that is, to make the voltage connected to the non-inverting input terminal of the operational amplification unit equal to 1/2 of the positive power supply voltage. When each group of high-impedance resistors comprises a plurality of high-impedance resistors, the plurality of high-impedance resistors can be connected in series, in parallel or in series-parallel mixed connection, as long as the equivalent resistance values of the plurality of impedance matching resistors are ensured to meet the design requirements. For example, when the signal isolator is applied to an AISG signal testing system, the high impedance resistance may be 10K Ω resistors, and specifically, the equivalent resistance of each group of high impedance resistors may be designed to be 10K Ω.
In the embodiment of the present application, the operational amplification unit is powered by a single power supply (that is, only the positive power source end of the operational amplification unit is connected to the positive power supply, and the negative power source end is grounded), so that a voltage offset of 1/2, which is the positive power supply voltage, is provided to the non-inverting input end of the operational amplification unit through the high impedance unit, and a signal input by the non-inverting input end of the operational amplification unit can be ensured to be completely output to the output end of the operational amplification unit.
As shown in fig. 3, in one embodiment, the signal isolator 10 further comprises a decoupling capacitance unit 7;
the decoupling capacitor unit 7 is connected in series between the positive power supply terminal of the operational amplification unit 3 and ground.
In an application, the decoupling capacitor unit may be implemented by at least one decoupling capacitor. When the decoupling capacitor unit is implemented by a plurality of decoupling capacitors, the plurality of decoupling capacitors are connected in parallel. The decoupling capacitor unit is used for eliminating power supply noise of a power supply end of the operational amplifier. Fig. 3 exemplarily shows a case that the signal isolator further includes a decoupling capacitor unit on the basis of fig. 2.
As shown in fig. 4, 5 or 6, in one embodiment, the input impedance matching unit 1 includes a first impedance matching resistor R1, and the output impedance matching unit 5 includes a second impedance matching resistor R2;
a first end and a second end of the first impedance matching resistor R1 respectively constitute an input end and an output end of the input impedance matching unit 1;
the first and second terminals of the second impedance matching resistor R2 constitute the input and output terminals of the output impedance matching unit, respectively.
In application, when the signal isolator is applied to an AISG signal testing system, the resistance values of the first impedance matching resistor and the second impedance matching resistor may be designed to be 50 Ω.
As shown in fig. 4, 5 or 6, in one embodiment, the input dc blocking unit 2 comprises a first dc blocking capacitance C1, and the output dc blocking unit 4 comprises a second dc blocking capacitance C2;
the first end and the second end of the first blocking capacitor C1 respectively form the input end and the output end of the input blocking unit 2;
the first and second terminals of the second dc blocking capacitor C2 constitute the input and output terminals, respectively, of the output dc blocking unit 4.
In application, when the signal isolator is applied to an AISG signal test system, the first blocking capacitor and the second blocking capacitor can be designed into nano-scale capacitors according to the frequency of an AISG signal.
As shown in fig. 4, 5 or 6, in one embodiment, the operational amplification unit 3 includes an operational amplifier UA;
the non-inverting input terminal, the positive power terminal, the negative power terminal and the output terminal of the operational amplifier UA respectively constitute the non-inverting input terminal, the positive power terminal, the negative power terminal and the output terminal of the operational amplifier unit 3.
As shown in fig. 4, 5 or 6, in one embodiment, the decoupling capacitor unit 7 includes a decoupling capacitor C3 in one embodiment;
the decoupling capacitor C3 is connected in series between the positive power supply terminal of the operational amplifier UA and ground.
As shown in fig. 5 or 6, in one embodiment, the high impedance unit 6 includes a first high impedance resistor R3 and a second high impedance resistor R4;
a first end of the first high-impedance resistor R3 constitutes an input terminal of the high-impedance unit 6, a second end of the first high-impedance resistor R3 and a first end of the second high-impedance resistor R4 are electrically connected to constitute a first output terminal of the high-impedance unit 6, and a second end of the second high-impedance resistor R4 constitutes a second output terminal of the high-impedance unit 6.
In application, when the signal isolator is applied to an AISG signal testing system, the first high-impedance resistor and the second high-impedance resistor can be designed to be 10K ohm resistors, and specifically, the resistance values of the first high-impedance resistor and the second high-impedance resistor are 10K Ω.
As shown in fig. 6, in one embodiment, the operational amplification unit 3 further includes a feedback resistor R5, a damping resistor R6, and a damping capacitor C4;
the feedback resistor R5 is electrically connected between the inverting input end and the output end of the operational amplifier UA;
the damping resistor R6 and the damping capacitor C4 are connected in series between the inverting input terminal of the operational amplifier UA and ground.
In application, a feedback resistor is arranged between the inverting input end and the output end of the operational amplifier, and a damping resistor and a damping capacitor are connected between the inverting input end of the operational amplifier and the ground in series, so that the operational amplification unit has both a signal isolation function and a signal amplification function.
As shown in fig. 7, an embodiment of the present application further provides a signal testing system, which includes a signal source 20, a first band pass filter 30, a product under test 40, a signal isolator 10, a second band pass filter 50, and a testing device 60, which are electrically connected in sequence;
the signal source 20 is used for generating an AISG signal with a center frequency of 2.176MHz, the center frequency of the first band-pass filter 30 is 2.176MHz, the input end and the output end of the signal isolator 10 are electrically connected with the product under test 40 and the second band-pass filter 50 respectively, and the center frequency of the second band-pass filter 50 is 4.352 MHz.
In application, the signal source can select any equipment capable of emitting the AISG signal with the center frequency of 2.176MHz according to actual needs, for example, an oscillator with the center frequency of 2.176 MHz. The first band-pass filter is used for passing AISG signals with the center frequency of 2.176MHz and filtering stray signals of other frequencies. The tested product can be a Tower top Amplifier (Tower Amplifier) or a Combiner (Combiner). The second band-pass filter is used for passing through the AISG signal and is 4.352MHz for the second harmonic central frequency that produces behind the product under test, the spurious signal of other frequencies of filtering. The test equipment can select any equipment capable of detecting the second harmonic with the center frequency of 4.352MHz according to actual needs, such as a spectrometer or a detector.
The signal isolator that this application embodiment provided can realize being surveyed the product and the effective isolation between the band-pass filter that central frequency is 4.352MHz when being applied to AISG signal test system, improves the accuracy and the small in size of test result.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A signal isolator is characterized by comprising an input impedance matching unit, an input blocking unit, an operational amplification unit, an output blocking unit and an output impedance matching unit;
the input end of the input impedance matching unit is electrically connected with the input end of the input blocking unit to form the input end of the signal isolator, and the output end of the input impedance matching unit is grounded;
the output end of the input blocking unit is electrically connected with the non-inverting input end of the operational amplification unit;
the inverting input end of the operational amplification unit is electrically connected with the output end of the operational amplification unit and the input end of the output blocking unit, and the positive power supply end of the operational amplification unit is used for being connected with a positive power supply;
the output end of the output blocking unit is electrically connected with the input end of the output impedance matching unit;
the output end of the output impedance matching unit forms the output end of the signal isolator;
the negative power supply end of the operational amplification unit is used for accessing a negative power supply; or, the signal isolator further includes a high impedance unit, a negative power supply end of the operational amplification unit is grounded, an input end of the high impedance unit is used for being connected to the positive power supply, a first output end of the high impedance unit is electrically connected with an output end of the input blocking unit and a non-inverting input end of the operational amplification unit, and a second output end of the high impedance unit is grounded.
2. The signal isolator of claim 1, wherein the input impedance matching unit comprises a first impedance matching resistor and the output impedance matching unit comprises a second impedance matching resistor;
the first end and the second end of the first impedance matching resistor respectively form an input end and an output end of the input impedance matching unit;
the first end and the second end of the second impedance matching resistor respectively form the input end and the output end of the output impedance matching unit.
3. The signal isolator of claim 1, wherein the input blocking unit comprises a first blocking capacitance and the output blocking unit comprises a second blocking capacitance;
the first end and the second end of the first blocking capacitor respectively form the input end and the output end of the input blocking unit;
and the first end and the second end of the second blocking capacitor respectively form the input end and the output end of the output blocking unit.
4. The signal isolator of claim 3, wherein the first blocking capacitance and the second blocking capacitance are nanofarad capacitors.
5. The signal isolator of claim 1, wherein the operational amplification unit comprises an operational amplifier;
the non-inverting input end, the positive power end, the negative power end and the output end of the operational amplifier respectively form the non-inverting input end, the positive power end, the negative power end and the output end of the operational amplification unit.
6. The signal isolator of claim 5, wherein the operational amplification unit further comprises a feedback resistor, a damping resistor, and a damping capacitor;
the feedback resistor is electrically connected between the inverting input end and the output end of the operational amplifier;
the damping resistor and the damping capacitor are connected in series between the inverting input end of the operational amplifier and the ground.
7. The signal isolator of claim 1, wherein the high-impedance unit comprises a first high-impedance resistor and a second high-impedance resistor;
the first end of the first high-impedance resistor forms the input end of the high-impedance unit, the second end of the first high-impedance resistor and the first end of the second high-impedance resistor are electrically connected to form the first output end of the high-impedance unit, and the second end of the second high-impedance resistor forms the second output end of the high-impedance unit.
8. The signal isolator of claim 7, wherein the first high-impedance resistor and the second high-impedance resistor are 10K Ω resistors.
9. The signal isolator of any one of claims 1 to 8, further comprising a decoupling capacitor unit;
the decoupling capacitor unit is connected in series between a positive power supply end of the operational amplification unit and the ground.
10. A signal testing system, comprising a signal source, a first band-pass filter, a product under test, a signal isolator according to any one of claims 1 to 9, a second band-pass filter and a testing device which are electrically connected in sequence;
the signal source is used for generating an antenna interface standard organization signal with the center frequency of 2.176MHz, the center frequency of the first band-pass filter is 2.176MHz, the input end and the output end of the signal isolator are respectively electrically connected with the product to be tested and the second band-pass filter, and the center frequency of the second band-pass filter is 4.352 MHz.
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| CN202123073964.3U CN216670093U (en) | 2021-12-08 | 2021-12-08 | Signal isolator and signal test system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117269594A (en) * | 2023-11-20 | 2023-12-22 | 中国科学技术大学 | Voltage processing system for radiation detector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117269594A (en) * | 2023-11-20 | 2023-12-22 | 中国科学技术大学 | Voltage processing system for radiation detector |
| CN117269594B (en) * | 2023-11-20 | 2024-03-29 | 中国科学技术大学 | Voltage processing system for radiation detector |
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