CN112436902A - Signal detection circuit and electronic device - Google Patents
Signal detection circuit and electronic device Download PDFInfo
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- CN112436902A CN112436902A CN202011242171.7A CN202011242171A CN112436902A CN 112436902 A CN112436902 A CN 112436902A CN 202011242171 A CN202011242171 A CN 202011242171A CN 112436902 A CN112436902 A CN 112436902A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/0082—Monitoring; Testing using service channels; using auxiliary channels
- H04B17/0085—Monitoring; Testing using service channels; using auxiliary channels using test signal generators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/101—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
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Abstract
The application discloses signal detection circuitry and electronic equipment, this signal detection circuitry includes: a signal generation module; the antenna is connected with the first output end of the signal generation module; the input end of the first coupler is connected with the second output end of the signal generation module; the input end of the harmonic signal detection module is connected with the output end of the first coupler; and the input end of the modem is connected with the output end of the harmonic signal detection module, and the output end of the modem is connected with the control end of the harmonic signal detection module. The signal detection circuit can detect the harmonic signals through the harmonic signal detection module under the condition that the radio-frequency signals transmitted by the signal generation module include the harmonic signals, so that the harmonic risk during the authentication test is greatly reduced.
Description
Technical Field
The application belongs to the technical field of electronic circuits, and particularly relates to a signal detection circuit and electronic equipment.
Background
Radio frequency interference is a difficult problem in the mobile communication industry at present, the radio frequency interference generated by one electronic device may seriously affect the normal communication of other electronic devices, and the certification test items of the radio frequency interference type are one of the most concerned certification test items of all electronic device manufacturers.
In the related art, since various non-linear devices such as a power amplifier and a switch are included in the electronic device, the occurrence of harmonics is inevitable, and thus, the harmonic spurious interference is the most serious and common one in the radio frequency interference.
The radio frequency framework adopted in the communication industry at present can only detect the power of fundamental wave signals, and does not have the function of detecting the power of harmonic wave signals, so that a production line cannot screen out electronic equipment with harmonic wave risks in advance, and the harmonic wave risks and the random inspection risks during authentication testing are large.
Disclosure of Invention
The present application is directed to a signal detection circuit and an electronic device that solve at least one of the problems set forth in the background.
In order to solve the technical problem, the present application is implemented as follows:
in a first aspect, an embodiment of the present application provides a signal detection circuit, including:
a signal generation module;
the antenna is connected with the first output end of the signal generation module;
the input end of the first coupler is connected with the second output end of the signal generation module;
the input end of the harmonic signal detection module is connected with the output end of the first coupler;
the input end of the modem is connected with the output end of the harmonic signal detection module, and the output end of the modem is connected with the control end of the harmonic signal detection module;
the first coupler couples the radio frequency signal generated by the signal generation module to the harmonic signal detection module, wherein the radio frequency signal comprises a target harmonic signal;
the modem sends a harmonic detection signal to the harmonic signal detection module, wherein the harmonic detection signal comprises a signal parameter of the target harmonic signal;
the harmonic signal detection module receives the harmonic detection signal and the radio frequency signal, generates a voltage signal corresponding to the target harmonic signal according to the signal parameter, and sends the voltage signal to the modem;
and the modem determines the power value of the target harmonic signal according to the voltage value of the voltage signal.
In a second aspect, an embodiment of the present application provides an electronic device, including:
a signal detection circuit as described above in relation to the first aspect.
In the embodiment of the application, a harmonic signal detection module is added in a signal detection circuit, and the signal detection circuit can convert a harmonic signal into a corresponding voltage signal through the harmonic signal detection module under the condition that a radio frequency signal transmitted by a signal generation module comprises the harmonic signal, and a power value corresponding to the voltage value of the voltage signal is identified by a modem, so that the power of the harmonic signal can be quickly detected. According to the signal detection circuit of this embodiment, because its power size that can detect out the harmonic signal to make the production line can screen out the electronic equipment that the harmonic is risky in advance, thereby harmonic risk and selective examination risk when greatly reduced authentication test.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a first signal detection circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a second signal detection circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a third signal detection circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a fourth signal detection circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a fifth signal detection circuit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a sixth signal detection circuit according to an embodiment of the present invention.
Reference numerals:
10-signal detection circuit, 110-signal generation module, 111-radio frequency integrated unit, 112-first amplifier, 113-tuner, 120-antenna, 130-first coupler, 140-harmonic signal detection module, 141-signal distribution unit, 1411-first power divider, 1412-second power divider, 1413-third power divider, 1414-first switch, 1415-fourth power divider, 142-target harmonic signal generation unit, 1421-first filter, 1422-phase-locked loop unit, 1422 a-phase discriminator, 1422 b-second filter, 1422 c-voltage-controlled oscillator, 1422 d-frequency divider, 143-candidate harmonic signal generation unit, 1431-second switch, 1432-third filter, 1433-fourth filter, 1434-third switch, 1435-second amplifier, 144-voltage signal generation unit, 1441-mixer, 1442-fifth filter, 1443-envelope detector, 1444-analog-to-digital converter.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The features of the terms first and second in the description and in the claims of the present application may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specified. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
In the description of the present invention, it is to be noted that, unless otherwise specifically stated or limited, the term "connected" means an electrical connection, which may be a direct connection, an indirect connection via an intermediate, or a communication between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The embodiment of the invention provides a signal detection circuit which can be applied to electronic equipment products. The electronic device may be a mobile phone, a tablet computer, a notebook computer, a palm computer, or a wearable device, and is not limited herein.
The circuit configuration of the signal detection circuit according to the embodiment of the present invention is described below with reference to fig. 1 to 6.
As shown in fig. 1, a signal detection circuit 10 provided according to some embodiments of the present invention includes a signal generation module 110, an antenna 120, a first coupler 130, a harmonic signal detection module 140, and a modem 150.
In this embodiment, the antenna 120 is connected to the first output terminal of the signal generating module 110, the input terminal of the first coupler 130 is connected to the second output terminal of the signal generating module 110, the ground terminal of the first coupler 130 is grounded, the input terminal of the harmonic signal detecting module 140 is connected to the output terminal of the first coupler 130, the input terminal of the modem 140 is connected to the output terminal of the harmonic signal detecting module 140, and the output terminal of the modem 140 is connected to the control terminal of the harmonic signal detecting module 140.
In this embodiment, the signal generating module 110 is configured to generate a radio frequency signal, and since the signal generating module 110 includes a nonlinear device capable of generating a harmonic signal, the radio frequency signal includes not only a fundamental wave signal but also a harmonic signal, and the harmonic signal includes signal components of which the signal frequency is an integer multiple of the frequency of the fundamental wave signal, such as a 2 nd harmonic signal, a 3 rd harmonic signal, and a 4 th harmonic signal.
In this embodiment, the first coupler 130 may couple the radio frequency signal generated by the signal generating module 110 to the harmonic signal detecting module 140, and the radio frequency signal includes each harmonic signal including a target harmonic signal, where the target harmonic signal is a harmonic signal to be currently detected.
For example, the target harmonic signal may be a 2 nd harmonic signal, and the respective harmonic signals may include a 2 nd harmonic signal, a 3 rd harmonic signal, a 4 th harmonic signal, and the like.
In this embodiment, when the harmonic signal needs to be detected, the modem 150 sends a harmonic detection signal to the harmonic signal detection module 140, and the harmonic detection signal includes the signal parameter of the target harmonic signal.
The signal parameter may be a harmonic order of the target harmonic signal, e.g., the target harmonic signal is a 2 nd harmonic signal, then the signal parameter may be 2.
In this embodiment, the harmonic signal detection module 140 receives the harmonic detection signal and the rf signal, and generates a voltage signal corresponding to the target harmonic signal according to the signal parameter, and sends the voltage signal to the modem 150.
For example, the harmonic signal detection module 140 generates a voltage signal corresponding to the harmonic signal of order 2 according to the signal parameter 2 and sends the voltage signal to the modem 150.
In this embodiment, the modem 150 determines the power value of the target harmonic signal according to the voltage value of the voltage signal.
Since the voltage values and the power values are in one-to-one correspondence, the modem 150 can determine the power value of the 2 nd harmonic signal according to the voltage values, so that the power value of the 2 nd harmonic signal can be detected quickly. It can be understood that the detection processes of the 3 rd order harmonic signal, the 4 th order harmonic signal and the 2 nd order harmonic signal are the same, and the description thereof is omitted here.
According to the signal detection circuit provided by the embodiment of the invention, the harmonic signal detection module is added in the signal detection circuit, the signal detection circuit can convert the harmonic signal into the corresponding voltage signal through the harmonic signal detection module under the condition that the radio-frequency signal generated by the signal generation module comprises the harmonic signal, and as the voltage value is in one-to-one correspondence with the power value, the modem can determine the power value of the harmonic signal according to the voltage value of the voltage signal, so that the power of the harmonic signal can be quickly detected. According to the signal detection circuit of this embodiment, because its power size that can detect out the harmonic signal to make the production line can screen out the electronic equipment that the harmonic is risky in advance, harmonic risk and selective examination risk when greatly reduced authentication test.
According to some embodiments of the present invention, as shown in fig. 2, the signal generation module 110 may include a radio frequency integration unit 111, a first amplifier 112, and a tuner 113.
In this embodiment, the first amplifier 112 may be a power amplifier.
In this embodiment, as shown in fig. 2, an output end of the radio frequency integrated unit 111 is connected to an input end of the first amplifier 112, an output end of the first amplifier 112 is connected to an input end of the tuner 113, an output end of the tuner 113 is a first output end of the signal generating module 110, and an output end of the power amplifier is a second output end of the signal generating module 110.
The first amplifier 112 is a main nonlinear device for generating harmonic signals, and the radio frequency signals generated by the first amplifier 112 may include fundamental signals and harmonic signals, and the radio frequency signals can be coupled to the harmonic signal detection module 140 through the first coupler 130, so that the harmonic signal detection module 140 can detect the harmonic signals in the radio frequency signals.
In this embodiment, as shown in fig. 4, an output end of the radio frequency integrated unit 111 is connected to an input end of the first amplifier 112, an output end of the first amplifier 112 is connected to an input end of the tuner 113, and output ends of the tuner 113 are a first output end and a second output end of the signal generating module 110.
The tuner 113 is another nonlinear device for generating a harmonic signal, the radio frequency signal generated by the tuner 113 also includes a harmonic signal, the radio frequency signals generated by the first amplifier 111 and the tuner 113 can be coupled to the harmonic signal detection module 140 through the first coupler 130, and then the harmonic signal detection module 140 detects the harmonic signal in the radio frequency signal, so that the harmonic detection of the electronic device is more complete.
According to still further embodiments of the present invention, as shown in fig. 1, the harmonic signal detection module 140 includes a signal distribution unit 141, a target harmonic signal generation unit 142, a candidate harmonic signal generation unit 143, and a voltage signal generation unit 144.
In this embodiment, an input end of the signal distribution unit 141 is an input end of the harmonic signal detection module 140, a first output end of the signal distribution unit 141 is connected to an input end of the target harmonic signal generation unit 142, a second output end of the signal distribution unit 141 is connected to an input end of the candidate harmonic signal generation unit 143, an output end of the target harmonic signal generation unit 142 is connected to a first input end of the voltage signal generation unit 144, an output end of the candidate harmonic signal generation unit 143 is connected to a second input end of the voltage signal generation unit 144, an output end of the voltage signal generation unit 144 is an output end of the harmonic signal detection module 140, and a control end of the target harmonic signal generation unit 142 is a control end of the harmonic signal detection module 140.
In this embodiment, the signal distribution unit 141 can receive the rf signal coupled by the first coupler 130, and divide the rf signal into two paths, one path is generated by the target harmonic signal generation unit 142 to be detected, the other path is generated by the candidate harmonic signal generation unit 143 to generate each harmonic signal, and then the voltage signal generation unit 144 processes the target harmonic signal and each harmonic signal to generate a voltage signal corresponding to the target harmonic signal.
According to still other embodiments of the present invention, as shown in fig. 2, the signal distribution unit 141 includes a first power divider 1411 and a second power divider 1412.
In this embodiment, as shown in fig. 2, an input end of the first power divider 1411 is an input end of the signal distribution unit 141, a first output end of the first power divider 1411 is connected to an input end of the second power divider 1412, a second output end of the first power divider 1411 is connected to an input end of the rf integrated unit 113, a first output end of the second power divider 1412 is a first output end of the signal distribution unit 141, and a second output end of the second power divider 1412 is a second output end of the signal distribution unit 141.
In this embodiment, the signal distribution unit 141 includes a first power divider 1411 and a second power divider 1412, the first power divider 1411 is capable of receiving the rf signal coupled by the first coupler 130, dividing the rf signal into two paths, one path being sent to the rf integration unit 113, and detecting the power of the fundamental wave signal by calibrating a production line with the aid of devices such as a noise amplifier inside the rf integration unit 113; one path is sent to the second power divider 1412, the second power divider 1412 receives the path of radio frequency signal and divides the radio frequency signal into two paths, one path is sent to the target harmonic signal generation unit 142 to generate a target harmonic signal to be detected, the other path is sent to the candidate harmonic signal generation unit 143 to generate each harmonic signal, and then the voltage signal generation unit 144 processes the target harmonic signal and each harmonic signal to generate a voltage signal corresponding to the target harmonic signal.
According to still other embodiments of the present invention, as shown in fig. 3, the signal distribution unit 141 may also include a third power divider 1413 and a first switch 1414, the first switch 1414 including a first movable contact and two second stationary contacts.
In this embodiment, an input end of the third power divider 1413 is an input end of the signal distribution unit 141, a first output end of the third power divider 1413 is a first output end of the signal distribution unit 141, a second output end of the third power divider 1413 is connected to the first movable contact, one of the second stationary contacts a is a second output end of the signal distribution unit 141, and the other second stationary contact b is connected to an input end of the rf integration unit 113.
In this embodiment, the signal distribution unit 141 includes a third power divider 1413 and a first switch 1413, so as to implement purposefully performing fundamental wave signal detection or harmonic signal detection according to actual requirements. Specifically, the third power divider 1413 can receive the rf signal coupled by the first coupler 130, and divide the rf signal into two paths, one path is sent to the target harmonic signal generation unit 142 to generate a target harmonic signal to be detected, and the other path is sent to the first switch 1413, when the fundamental wave signal needs to be detected, the first movable contact of the first switch 1413 is controlled to be connected with the first stationary contact b, at this time, the first switch 1413 is connected with the input end of the rf integration unit 113, so that the detection of the power of the fundamental wave signal is realized by the calibration combined with the production line of devices such as a noise amplifier inside the rf integration unit 113; when the harmonic signal detection is required, the first movable contact of the first switch 1413 is controlled to be connected to the first stationary contact a, at this time, the first switch 1413 is connected to the candidate harmonic signal generating unit 143 to generate each harmonic signal, and the voltage signal generating unit 144 processes the target harmonic signal and each harmonic signal to generate a voltage signal corresponding to the target harmonic signal.
According to still further embodiments of the present invention, as shown in fig. 6, the signal detection circuit 10 further includes a second coupler 160.
In this embodiment, the input terminal of the second coupler 160 is connected to the output terminal of the first amplifier 111, and the output terminal of the second coupler 160 is connected to the input terminal of the rf integration unit 143.
Here, the signal distribution unit 141 may also include only the fourth power divider 1415, where an input terminal of the fourth power divider 1415 is an input terminal of the signal distribution unit 141, a first output terminal of the fourth power divider 1415 is a first output terminal of the signal distribution unit 141, and a second output terminal of the fourth power divider 1415 is a second output terminal of the signal distribution unit 141.
In this embodiment, two couplers, namely the first coupler 130 and the second coupler 160, are provided, and the second coupler 160 can couple the radio frequency signal passing through the power amplifier 141 to the radio frequency integrated unit 143, so as to realize detection of the power level of the fundamental wave signal. The first coupler 130 can couple the radio frequency signal passing through the tuner 113 to the fourth power divider 1415, the fourth power divider 1415 divides the radio frequency signal into two paths, one path is sent to the target harmonic signal generation unit 142 to generate a target harmonic signal to be detected, the other path is sent to the candidate harmonic signal generation unit 143 to generate each harmonic signal, and then the voltage signal generation unit 144 processes the target harmonic signal and each harmonic signal to generate a voltage signal corresponding to the target harmonic signal.
According to still other embodiments of the present invention, as shown in fig. 2, the target harmonic signal generating unit 142 includes a first filter 1421 and a phase-locked loop unit 1422.
In this embodiment, an input end of the first filter 1421 is an input end of the target harmonic signal generating unit 142, an output end of the first filter 1421 is connected to an input end of the phase-locked loop unit 1422, an output end of the phase-locked loop unit 1422 is an output end of the target harmonic signal generating unit 142, and a control end of the phase-locked loop unit 1422 is a control end of the target harmonic signal generating unit 142.
The first filter 1421 may be a low pass filter.
Further, the phase-locked loop unit 1422 includes a phase detector 1422a, a second filter 1422b, a voltage-controlled oscillator 1422c, and a frequency divider 1422 d. Moreover, an input end of the phase detector 1422a is an input end of the phase-locked loop unit 1422, an output end of the phase detector 1422a is connected to an input end of the second filter 1422b, an output end of the second filter 1422b is connected to an input end of the voltage-controlled oscillator 1422c, an output end of the voltage-controlled oscillator 1422c is connected to an input end of the frequency divider 1422d, an output end of the voltage-controlled oscillator 1422c is an output end of the phase-locked loop unit 1422, an output end of the frequency divider 1422d is connected to a control end of the phase detector 1422a, and a control end of the frequency divider 1422a is a control end of the phase-.
The second filter 1422b may also be a low pass filter.
As shown in fig. 2, the candidate harmonic signal generating unit 143 includes a second switch 1431, a third filter 1432, a fourth filter 1433, a third switch 1434, and a second amplifier 1435, the second switch 1431 includes a second movable contact and two second stationary contacts, and the third switch 1434 includes a third movable contact and two third stationary contacts.
The third filter 1432 and the fourth filter 1433 are band pass filters, the band pass range of the third filter 1432 is 1600MHz to 3800MHz, and the band pass range of the fourth filter 1433 is 3400MHz to 15000 MHz.
In this embodiment, the second movable contact is an input terminal of the candidate harmonic signal generating unit 143, one of the second stationary contacts is connected to an input terminal of a third filter 1432, the other second stationary contact is connected to an input terminal of a fourth filter 1433, an output terminal of the third filter 1432 is connected to one of the third stationary contacts, an output terminal of the fourth filter 1433 is connected to the other third stationary contact, the third movable contact is connected to an input terminal of a second amplifier 1435, and an output terminal of the second amplifier 1435 is an output terminal of the candidate harmonic signal generating unit 143.
As shown in fig. 2, the voltage signal generating unit 144 includes a mixer 1441, a fifth filter 1442, an envelope detector 1443, and an analog-to-digital converter 1444.
The fifth filter 1442 may be a low pass filter.
In this embodiment, a first input terminal of the mixer 1441 is a first input terminal of the voltage signal generating unit 144, a second input terminal of the mixer 1441 is a second input terminal of the voltage signal generating unit 144, an output terminal of the mixer 1441 is connected to an input terminal of a fifth filter 1442, an output terminal of the fifth filter 1442 is connected to an input terminal of an envelope detector 1443, an output terminal of the envelope detector 1443 is connected to an input terminal of an analog-to-digital converter 1444, and an output terminal of the analog-to-digital converter 1444 is an output terminal of the voltage signal generating unit 144.
Taking fig. 2 as an example to describe the signal detection process in detail, the rf signal generated by the power amplifier 112 includes a fundamental wave signal and a harmonic wave signal, and the rf signal coupled out by the first coupler 130 is divided into 2 paths by the first power divider 1411, wherein one path enters the rf integrated unit 111 for detecting the fundamental wave signal.
The other path of rf signal also includes a fundamental wave signal and a harmonic wave signal, but this path is used to detect the harmonic wave signal, this path is divided into 2 paths after passing through the second power divider 1412, the left path of signal passes through the first filter 1421 to filter the harmonic wave signal, retain the fundamental wave signal, and then implement frequency multiplication for 2, 3, 4, etc. times by the phase-locked loop unit 1422, so as to become a pure certain harmonic wave signal S1, for example, a 2-order harmonic wave signal (the frequency division number N of the frequency divider 1422d is controlled by the modem 150, for example, when detecting the 2-order harmonic wave signal, the frequency division number N of the frequency divider 1422d needs to be controlled to be 2).
The right signal passes through the second switch 1431, the third filter 1432, the fourth filter 1433, and the third switch 1434 to filter the fundamental wave signal, and the function of the higher harmonic signal is retained, so that the higher harmonic signal S2 is obtained. The band-pass range of the third filter 1432 is 1600MHz to 3800MHz, which can filter fundamental wave signals and retain low-frequency 2, 3 and 4 harmonic signals. The band-pass range of the fourth filter 1433 is 3400 MHz-15000 MHz, and can filter fundamental wave signals, and retain 2, 3, and 4 harmonic signals of the intermediate frequency, 2, 3, and 4 harmonic signals of the high frequency, and 2, and 3 harmonic signals of Sub 6G. At the same time, each harmonic signal S2 enters the low noise amplifier 1435 to be amplified.
A certain harmonic signal S1, for example, a 2 nd harmonic signal S1 and each harmonic signal S2 are mixed by a mixer 1441 to generate a zero-frequency signal + an intermediate-frequency signal S3, and the intermediate-frequency signal is filtered by a low-pass filter 1442 to retain the zero-frequency signal. The zero-frequency signal passes through the envelope detector 1443 and the analog-to-digital converter 1444, and the zero-frequency signal is converted into a voltage signal, and the voltage signal is sent to the modem 150, so that the electronic device can know the power of the 2 nd harmonic signal in the radio frequency signal.
As can be seen from fig. 2, the harmonic signal can be mixed into the zero-frequency signal, and the zero-frequency signal is converted into a voltage signal readable by the modem, that is, the detection of the power of each subharmonic signal can be additionally implemented on the original fundamental power detection path in the reserved radio frequency architecture, so that the risk of the excessive conducted harmonic on the circuit can be detected and predicted in advance.
Taking fig. 3 as an example to describe the signal detection process in detail, the rf signal generated by the power amplifier 112 includes a fundamental wave signal and a harmonic wave signal, the rf signal coupled out by the first coupler 130 is divided into 2 paths by the third power divider 1413, one of the paths enters the low pass filter 1421 to filter the harmonic wave signal, the fundamental wave signal is retained, and then frequency multiplication of 2, 3, 4, etc. is implemented by the phase-locked loop unit 1422 to become a pure certain harmonic wave signal S1, for example, 2 harmonics (the frequency division number N of the frequency divider 1422d is controlled by the modem 150, for example, when detecting a 2-th harmonic wave signal, the frequency division number N of the frequency divider 1422d needs to be controlled to be 2).
The other path of the signal also contains a fundamental wave signal and a harmonic wave signal, but the path can be used for detecting the fundamental wave signal and also can be used for detecting the harmonic wave signal, when the fundamental wave signal is required to be detected, the first movable contact of the first switch 1413 is controlled to be connected with the first fixed contact b, at this time, the first switch 1413 is connected with the input end of the radio frequency integrated unit 113, and the radio frequency signal enters the radio frequency integrated unit 111, so that the detection of the fundamental wave signal is realized; when the harmonic signal detection is needed, the first movable contact of the first switch 1413 is controlled to be connected with the first stationary contact a, and at this time, the path of radio frequency signal passes through the second switch 1431, the third filter 1432, the fourth filter 1433 and the third switch 1434 to filter the fundamental wave signal, and the function of the higher harmonic signal is retained, and at this time, the higher harmonic signal S2 is obtained. At the same time, each harmonic signal S2 enters the low noise amplifier 1435 to be amplified.
A certain harmonic signal S1, for example, a 2 nd harmonic signal S1 and each harmonic signal S2 are mixed by a mixer 1441 to generate a zero-frequency signal + an intermediate-frequency signal S3, and the intermediate-frequency signal is filtered by a low-pass filter 1442 to retain the zero-frequency signal. The zero-frequency signal passes through the envelope detector 1443 and the analog-to-digital converter 1444, and the zero-frequency signal is converted into a voltage signal, and the voltage signal is sent to the modem 150, so that the electronic device can know the power of the 2 nd harmonic signal in the radio frequency signal.
As can be seen from fig. 3, it is realized that purposefully performing fundamental wave signal detection or harmonic signal detection according to actual needs can improve user experience. Meanwhile, the power divider is replaced by 1 switch, so that the circuit layout area is reduced.
Taking fig. 4 as an example to briefly describe the signal detection process, fig. 4 and fig. 2 are different in that the position of the first coupler 130 is adjusted, and here, the rf signals generated by the power amplifier 112 and the tuner 113 can be coupled to the first power divider 1411 through the first coupler 130, so as to perform the following fundamental wave signal detection or harmonic wave signal detection. For how to perform the fundamental wave signal detection or the harmonic wave signal detection, reference may be made to the above flow of signal detection described by taking fig. 1 as an example, which is not described herein again.
As can be seen from fig. 4, the tuner 113 is also an important source of harmonic signal generation, and if the harmonic signal generated by the tuner 113 can be detected, the harmonic detection of the whole board becomes more complete.
Taking fig. 5 as an example to briefly describe the signal detection process, fig. 5 and fig. 3 differ in that the position of the first coupler 130 is adjusted, and here, the rf signals generated by the power amplifier 112 and the tuner 113 can be coupled to the third power divider 1413 through the first coupler 130, so as to perform the following fundamental wave signal detection or harmonic signal detection. For how to perform the fundamental wave signal detection or the harmonic wave signal detection, reference may be made to the flow of signal detection described by taking fig. 3 as an example, which is not described herein again.
As can be seen from fig. 5, the tuner 113 is also an important source of harmonic signal generation, and if the harmonic signal generated by the tuner 113 can be detected, the harmonic detection of the whole board becomes more complete.
Taking fig. 6 as an example to briefly describe the signal detection process, fig. 6 retains the second coupler 160 commonly used in the present circuit, and adds the first coupler 130. The rf signal generated by the power amplifier 112 includes a fundamental wave signal and a harmonic wave signal, and the signal coupled by the second coupler 160 is sent to the rf integrated unit 111 for detecting the fundamental wave signal.
The radio frequency signals generated by the tuner 113 and the power amplifier 112 pass through the first coupler 130 to perform harmonic signal detection, and for how to perform harmonic signal detection, reference may be made to the flow of signal detection described by taking fig. 2 as an example, which is not described herein again.
An embodiment of the present invention further provides an electronic device, where the electronic device includes:
any of the signal detection circuits 10 provided in the circuit embodiment sections above.
In this embodiment, the electronic device may be a mobile phone, a tablet computer, a notebook computer, a palm computer, a wearable device, or the like.
In this embodiment, since the electronic device provided by the embodiment of the present invention includes any signal detection circuit provided in the embodiment of the signal detection circuit, the electronic device provided by the embodiment of the present invention can achieve the same function as any signal detection circuit provided in the embodiment of the signal detection circuit. That is, a harmonic signal detection module is added to the signal detection circuit, and the signal detection circuit can convert the harmonic signal into a corresponding voltage signal through the harmonic signal detection module when the radio frequency signal transmitted by the signal generation module includes the harmonic signal, and identify a power value corresponding to the voltage value of the voltage signal through the modem, so that the power level of the harmonic signal can be quickly detected. According to the signal detection circuit of this embodiment, because its power size that can detect out the harmonic signal to make the production line can screen out the electronic equipment that the harmonic is risky in advance, thereby harmonic risk and selective examination risk when greatly reduced authentication test.
The above embodiments mainly describe the differences between the corresponding embodiments and other embodiments, and each embodiment may be used alone or in combination with each other, which is not limited herein, and the same or similar parts of each embodiment may be referred to each other.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (11)
1. A signal detection circuit, comprising:
a signal generation module;
the antenna is connected with the first output end of the signal generation module;
the input end of the first coupler is connected with the second output end of the signal generation module;
the input end of the harmonic signal detection module is connected with the output end of the first coupler;
the input end of the modem is connected with the output end of the harmonic signal detection module, and the output end of the modem is connected with the control end of the harmonic signal detection module;
the first coupler couples the radio frequency signal generated by the signal generation module to the harmonic signal detection module, wherein the radio frequency signal comprises a target harmonic signal;
the modem sends a harmonic detection signal to the harmonic signal detection module, wherein the harmonic detection signal comprises a signal parameter of the target harmonic signal;
the harmonic signal detection module receives the harmonic detection signal and the radio frequency signal, generates a voltage signal corresponding to the target harmonic signal according to the signal parameter, and sends the voltage signal to the modem;
and the modem determines the power value of the target harmonic signal according to the voltage value of the voltage signal.
2. The signal detection circuit of claim 1, wherein the signal generation module comprises a radio frequency integrated unit, a first amplifier, and a tuner;
the output end of the radio frequency integrated unit is connected with the input end of the first amplifier, the output end of the first amplifier is connected with the input end of the tuner, and the output end of the tuner is the first output end of the signal generation module; and the number of the first and second groups,
the output end of the tuner is a second output end of the signal generation module; or, the output end of the first amplifier is the second output end of the signal generation module.
3. The signal detection circuit according to claim 2, wherein the harmonic signal detection module includes a signal distribution unit, a target harmonic signal generation unit, a candidate harmonic signal generation unit, and a voltage signal generation unit,
the input end of the signal distribution unit is the input end of the harmonic signal detection module, the first output end of the signal distribution unit is connected with the input end of the target harmonic signal generation unit, the second output end of the signal distribution unit is connected with the input end of the candidate harmonic signal generation unit, the output end of the target harmonic signal generation unit is connected with the first input end of the voltage signal generation unit, the output end of the candidate harmonic signal generation unit is connected with the second input end of the voltage signal generation unit, the output end of the voltage signal generation unit is the output end of the harmonic signal detection module, and the control end of the target harmonic signal generation unit is the control end of the harmonic signal detection module.
4. The signal detection circuit of claim 3, wherein the signal distribution unit comprises a first power divider and a second power divider,
the input end of the first power divider is the input end of the signal distribution unit, the first output end of the first power divider is connected with the input end of the second power divider, the second output end of the first power divider is connected with the input end of the radio frequency integrated unit, the first output end of the second power divider is the first output end of the signal distribution unit, and the second output end of the second power divider is the second output end of the signal distribution unit.
5. The signal detection circuit of claim 3, wherein the signal distribution unit comprises a third power divider and a first switch, the first switch comprising a first movable contact and two second stationary contacts,
an input end of the third power divider is an input end of the signal distribution unit, a first output end of the third power divider is a first output end of the signal distribution unit, a second output end of the third power divider is connected with the first movable contact, one of the second stationary contacts is a second output end of the signal distribution unit, and the other second stationary contact is connected with an input end of the radio frequency integration unit.
6. The signal detection circuit of claim 3, wherein the target harmonic signal generation unit includes a first filter and a phase-locked loop unit,
the input end of the first filter is the input end of the target harmonic signal generation unit, the output end of the first filter is connected with the input end of the phase-locked loop unit, the output end of the phase-locked loop unit is the output end of the target harmonic signal generation unit, and the control end of the phase-locked loop unit is the control end of the target harmonic signal generation unit.
7. The signal detection circuit of claim 6, wherein the phase-locked loop unit comprises a phase detector, a second filter, a voltage-controlled oscillator, and a frequency divider,
the input of phase discriminator does the input of phase-locked loop unit, the output of phase discriminator with the input of second wave filter is connected, the output of second wave filter with the input of voltage controlled oscillator is connected, the output of voltage controlled oscillator with the input of frequency divider is connected, the output of voltage controlled oscillator does the output of phase-locked loop unit, the output of frequency divider with the control end of phase discriminator is connected, the control end of frequency divider does the control end of phase-locked loop unit.
8. The signal detection circuit according to claim 3, wherein the harmonic-wave-candidate signal generation unit includes a second switch, a third filter, a fourth filter, a third switch, and a second amplifier, the second switch includes a second movable contact and two second stationary contacts, the third switch includes a third movable contact and two third stationary contacts,
the second movable contact is an input end of the candidate harmonic signal generating unit, one of the second stationary contacts is connected with an input end of the third filter, the other second stationary contact is connected with an input end of the fourth filter, an output end of the third filter is connected with one of the third stationary contacts, an output end of the fourth filter is connected with the other third stationary contact, the third movable contact is connected with an input end of the second amplifier, and an output end of the second amplifier is an output end of the candidate harmonic signal generating unit.
9. The signal detection circuit of claim 3, wherein the voltage signal generation unit comprises a mixer, a fifth filter, an envelope detector, and an analog-to-digital converter,
the first input end of the frequency mixer is the first input end of the voltage signal generating unit, the second input end of the frequency mixer is the second input end of the voltage signal generating unit, the output end of the frequency mixer is connected with the input end of the fifth filter, the output end of the fifth filter is connected with the input end of the envelope detector, the output end of the envelope detector is connected with the input end of the analog-to-digital converter, and the output end of the analog-to-digital converter is the output end of the voltage signal generating unit.
10. The signal detection circuit of claim 2, wherein in the case where the output of the tuner is the second output of the signal generation module, the signal detection circuit further comprises a second coupler,
the input end of the second coupler is connected with the output end of the first amplifier, and the output end of the second coupler is connected with the input end of the radio frequency integrated unit.
11. An electronic device, characterized in that it comprises a signal detection circuit according to any one of claims 1-10.
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