CN110995372B - Wireless communication terminal, power detection circuit and power calibration method - Google Patents
Wireless communication terminal, power detection circuit and power calibration method Download PDFInfo
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- CN110995372B CN110995372B CN201911209140.9A CN201911209140A CN110995372B CN 110995372 B CN110995372 B CN 110995372B CN 201911209140 A CN201911209140 A CN 201911209140A CN 110995372 B CN110995372 B CN 110995372B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
- H04B17/12—Monitoring; Testing of transmitters for calibration of transmit antennas, e.g. of the amplitude or phase
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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
- H04B17/102—Power radiated at antenna
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Abstract
The invention relates to a wireless communication terminal, a power detection circuit thereof and a power calibration method, wherein the power detection circuit comprises: the radio frequency circuit comprises an antenna, and the radio frequency transceiver comprises a power detection pin and a receiving pin; each antenna is provided with a coupler and is connected to a receiving pin of the radio frequency transceiver through the respective coupler, the coupling end of each coupler is respectively connected with the gating end of the single-pole multi-throw isolating switch through the respective power detection path, the common end of the single-pole multi-throw isolating switch is connected with the power detection pin through a power detection path so as to communicate the power detection pin with the power detection paths led out from the couplers, and the single-pole multi-throw isolating switch is used for increasing the isolation degree among the antennas and improving the accuracy of the actual output power calculation of the antennas.
Description
Technical Field
The present invention relates to the field of power calibration techniques for wireless communication terminals, and in particular, to a wireless communication terminal, a power detection circuit, and a power calibration method.
Background
Before the wireless communication terminals are sold on the market, calibration and testing are required to be carried out on each prototype in a production line, and the aim is to ensure that the parameters of each prototype are calibrated within a standard range so that the wireless communication terminals can work normally when being circulated to the hands of users. The power calibration of the antenna is a large category in the calibration branch, and if the deviation between the actual output power of the calibration antenna and the target output power is large, the phenomenon of abnormal operation may occur in the real network. For example, if the actual output power is to be increased, if the actual output power adjusted according to the target output power is too large, on one hand, the power consumption is large, and on the other hand, the linearity of the amplifier is poor, at this time, signals uploaded to the base station by the wireless communication terminal are distorted to a great extent, and problems and even network loss occur in communication with the base station; if the actual output power is reduced, if the actual output power adjusted according to the target output power is too small, the base station cannot receive the access request sent by the wireless communication terminal, and cannot establish communication connection. Especially, in the base station at the edge of the cell, in the mountainous area, in the ocean, in the desert, in the poor and remote areas, the signal coverage is worse, which will further highlight the problem. The target output power is usually preset, so that the detection of the actual output power in the power calibration process is very important, and the power calibration accuracy is directly influenced.
At present, a radio frequency system architecture of a wireless communication terminal generally has a plurality of antennas, and if the isolation between the antennas is not enough, the actual output power of the antennas is inaccurate to calculate, the deviation between the actual output power and the target output power of the antennas is directly influenced, and the power calibration is inaccurate.
Disclosure of Invention
In view of the above, it is desirable to provide a wireless communication terminal, a power detection circuit, and a power calibration method, which can improve the accuracy of the actual output power of an antenna.
In a first aspect, a power detection circuit is provided, where the power detection circuit includes: the radio frequency circuit comprises an antenna, and the radio frequency transceiver comprises a power detection pin and a receiving pin;
each antenna is provided with a coupler which is connected to a receiving pin of the radio frequency transceiver through the respective coupler, the coupling end of each coupler is respectively connected with the gating end of the single-pole multi-throw isolating switch through the respective power detection path, the common end of the single-pole multi-throw isolating switch is connected with the power detection pin through a power detection path so as to communicate the power detection pin with the power detection paths led out from the couplers, and the single-pole multi-throw isolating switch is used for increasing the isolation degree among the antennas.
According to the power detection circuit, the single-pole multi-throw isolating switch is introduced, so that power detection can be realized, the isolation between the antennas can be increased, the carrier-to-noise ratio of a power detection channel is improved, the correctness of power detection of the power detection pin is improved, the correctness of actual output power calculation of the antenna is improved, the power calibration deviation is reduced, and the precision of power calibration is improved.
In a second aspect, a wireless communication terminal is proposed, which includes the power detection circuit as described above.
According to the power detection circuit in the wireless communication terminal, the single-pole multi-throw isolating switch is introduced, so that power detection can be realized, the isolation between the antennas can be increased, the carrier-to-noise ratio of a power detection path is improved, the power detection correctness of the power detection pin is improved, the calculation correctness of the actual output power of the antenna is improved, the power calibration deviation is reduced, and the power calibration precision is improved.
In a third aspect, a power calibration method is provided, including:
obtaining power detected by a power detection pin in a power detection circuit, wherein the power detection circuit comprises: the radio frequency circuit comprises an antenna, and the radio frequency transceiver comprises a power detection pin and a receiving pin; each antenna is provided with a coupler and is connected to a receiving pin of the radio frequency transceiver through the respective coupler, the coupling end of each coupler is respectively connected with the gating end of the single-pole multi-throw isolating switch through the respective power detection path, the common end of the single-pole multi-throw isolating switch is connected with the power detection pin through a power detection path so as to communicate the power detection pin with the power detection paths led out from the respective couplers, and the single-pole multi-throw isolating switch is used for increasing the isolation degree among the antennas;
calculating the power of a coupling end according to the power detected by a power detection pin, wherein the power of the coupling end is equal to the power detected by the power detection pin plus the coupling differential loss between a coupler and the power detection pin;
calculating the actual output power of the antenna according to the coupling end power, wherein the actual output power is equal to the coupling end power plus a coupling coefficient;
the deviation of the actual output power of the antenna from the target output power of the antenna is calibrated.
According to the power calibration method, based on the power detection circuit, the power detection pin can detect power, and the actual output power of the antenna can be converted by combining the coupling coefficient of the coupler and the coupling difference loss between the coupler and the power detection pin. The power detection circuit introduces the single-pole multi-throw isolating switch, so that power detection on each power detection path can be realized, the isolation degree among antennas can be increased, and the carrier-to-noise ratio of the power detection paths is improved, so that the power detection correctness of the power detection pins is improved, the accuracy of the actual output power of the antenna obtained by the power calibration method is high, and the calibration precision can be improved.
Drawings
Fig. 1 is a schematic structural diagram of a power detection circuit of a coupler coupling end according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a power detection circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a power detection circuit according to another embodiment of the present invention;
FIG. 4 is a schematic diagram of a power detection circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a power calibration method according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that, in the embodiment of the present invention, the actual output power of the antenna may refer to the output power of the rf front end of the antenna.
A coupler, such as a double-ended coupler, is an important device for performing power calibration, and the actual output power of the antenna is estimated by the power of the coupling end of the coupler, as shown in fig. 1, the left end of the double-ended coupler 101 is connected to the antenna, and the right end of the double-ended coupler 101 is connected to a power meter 101, the actual output power of the antenna is a value obtained by adding the coupling coefficient to the power of the coupling end, and assuming that the coupling coefficient of the double-ended coupler 101 in fig. 1 is 25dB (decibel), the coupling end 1011 power of the power meter 102, which is tested by the power probe 103, is approximately-2 dBm (power unit, decibel), the actual output power of the antenna can be estimated to be 23 dBm. The power detection circuit of the wireless communication terminal does not have a real power probe and a real power meter, because a radio frequency system architecture of the wireless communication terminal is provided with a special power detection port in a radio frequency transceiver, a power detection path can be led out from a power detection pin and connected to a coupler coupling end to detect the power of the coupler coupling end, if the power of the power detection pin is directly taken as the power of the coupler coupling end, the calculated actual output power is inaccurate, and because the coupler coupling differential loss exists between the coupler and the power detection pin, the correct actual output power can be calculated by compensating the coupling differential loss. The value of the coupling difference loss cannot be directly identified by a radio frequency architecture system, so the coupling difference loss of the power detection path from the coupler to the power detection pin needs to be calibrated, and after the coupling difference loss is obtained through calibration, the value of the actual output power is calculated by compensating the coupling difference loss. The coupling loss generally includes line loss and attenuation network.
In the presence of coupling loss, the actual output power of the antenna is equal to the power detected by the power detection pin plus the coupling coefficient of the coupler, plus the value of the coupling loss. For example, the coupling coefficient of the coupler is 25dB, the attenuation network between the coupler and the power detection pin is 6dB, the line difference loss is 3dB, and it can be seen that the overall coupling coefficient of the path from the coupler to the power detection pin is 34dB, and if the power detected by the power detection pin is-10 dBm, the actual output power of the antenna is calculated to be-10 +34 dBm or 24dBm according to the above calculation method.
However, in a complex rf architecture system, there is more than one antenna and more than one power detection path, but the rf transceiver may only use one power detection pin to detect power, so how to connect each power detection path using one power detection pin is difficult. Therefore, a power detection circuit is provided to sequentially connect each power detection path in sequence and finally connect to the power detection pin, and since the transmission frequency bands of the antennas in the radio frequency system architecture are different and generally do not work simultaneously, the power detection of each antenna can be realized. A specific example of three antennas connected to a power detection pin through a power detection path is described below.
As shown in fig. 2, the power detection circuit includes: three antennas, namely a main set high frequency antenna 201, a main set low frequency antenna 202, a diversity low frequency antenna 203, and a system receiver 204, wherein the system receiver comprises a power detection pin (PDET pin in fig. 2), a first diversity reception pin (DRX 1 pin in fig. 2), a second diversity reception pin (DRX 2 pin in fig. 2), a third diversity reception pin (DRX 3 pin in fig. 2), a fourth diversity reception pin (DRX 4 pin in fig. 2), a first main set reception pin (PRX 1 pin in fig. 2), a second main set reception pin (PRX 2 pin in fig. 2), a third main set reception pin (PRX 4 pin in fig. 2), and a fourth main set reception pin (PRX 5 pin in fig. 2), the power detection circuit comprises three couplers, the main set low frequency antenna 202 is connected with a common terminal of a single-pole three-throw switch 206 through a coupler 205, one terminal of the single-pole three-throw switch is connected with the second main set reception pin through a band-pass filter 207, another gating end of the single-pole three-throw switch is connected with a first main set receiving pin through a low-pass filter 208 and a duplexer 209 in sequence, the main set high-frequency antenna 201 is connected with a single-pole two-throw switch 211 through a coupler 210, one gating end of the single-pole two-throw switch 211 is connected with a third main set receiving pin through a band-pass filter 212, the other gating end of the single-pole two-throw switch 211 is connected with a fourth main set receiving pin through a duplexer 213, the diversity low-frequency antenna 203 is connected with a common end of a single-pole four-throw switch 215 through a coupler 214, three of the gating ends of the single-pole four-throw switch 215 are connected with a first diversity receiving pin, a third diversity receiving pin and a fourth diversity receiving pin through a band-pass filter 216 and a band-pass filter 217 and a band-pass filter 218, and the remaining one gating end is connected with a second diversity receiving pin through a duplexer 219. As can be seen from fig. 2, the couplers of the three antennas are sequentially connected in series through their respective power detection paths, and are finally connected to the power detection pins of the rf transceiver 204.
The power detection circuit provided above is illustrated by taking fig. 2 as an example, a main set radio frequency path of a radio frequency architecture system includes a high frequency antenna and a low frequency antenna, a diversity radio frequency path includes a diversity antenna, and all of the main set high frequency antenna 201, the main set low frequency antenna 202, and the diversity low frequency antenna 203 transmit signals, so that all three radio frequency paths need to add couplers to perform power calibration, and in the case of detecting power by using only one power detection pin of the radio frequency transceiver 204, the power detection paths led out from the three couplers need to be connected in parallel to the power detection pin, although power detection of each antenna can be finally realized, if the isolation between any two antennas is insufficient, power calibration is inaccurate. The reason for the inaccurate power calibration is illustrated by way of example below.
In one embodiment, as shown in fig. 2, if the actual output power of the main set low frequency antenna 202 is XdBm, the coupling coefficients of all couplers are 25dB, the isolation between the main set low frequency antenna 202 and the main set high frequency antenna 201 is 10dB, the power of the main set low frequency antenna 202 coupled to the main set high frequency antenna 201 is (X-10) dBm, and if the loop loss of the power detection path is 0dB in an ideal case, when the actual output power of the main set low frequency antenna 202 is detected, the power of the main set low frequency antenna 202 coupled to the whole power detection path through the coupler 210 of the main set high frequency antenna 201, that is, three power detection paths connected in series is (X-35) dBm, and the power of the coupler 205 coupled end of the main set low frequency antenna 202 is (X-25) dBm, the carrier-to-noise ratio (abbreviated as C/N) (X-25) - (X-35) on the power detection path is calculated, it can be seen that the carrier-to-noise ratio of power detection is related to the isolation between antennas, which is ideally equal to the isolation between antennas with equal coupler coupling coefficients. Usually, in order to ensure the power detection accuracy, the minimum requirement of the carrier-to-noise ratio value of the power detection path is 24dB, otherwise, the power detection accuracy cannot be ensured, a large deviation occurs in the power detected by the power detection pin, and the actual transmission power of the antenna converted by the power detection pin is also inaccurate, which finally results in inaccurate power calibration. If the isolation between the main set low-frequency antenna 202 and the main set high-frequency antenna 201 is large enough, for example, at least 24dB, the carrier-to-noise ratio of the power detection path is also larger than 24dB, so that the power detection accuracy can be ensured, but the current wireless communication terminal generally adopts a multi-antenna design, the circuit structure is complex and compact, and the requirement that the isolation between the antennas is larger than 24dB is generally difficult to ensure.
Based on this, the embodiment of the present invention provides a power detection circuit, which can implement power detection of each antenna for a wireless communication terminal with a multi-antenna design, and can also improve isolation between the antennas, so that a carrier-to-noise ratio of a power detection path can ensure correctness of power detection of a power detection pin, ensure power detection precision, avoid large deviation of power detected by the power detection pin, increase accuracy of actual transmission power of a converted antenna, and finally improve power calibration accuracy.
Referring to fig. 3, the power detection circuit includes: the radio frequency transceiver 301 comprises a radio frequency transceiver 301, a single-pole multi-throw isolating switch 302, more than two radio frequency circuits, more than two couplers 303 and more than two power detection paths 304, wherein each radio frequency circuit comprises an antenna 305, and the radio frequency transceiver 301 comprises a power detection pin and a receiving pin; each antenna 305 is provided with a coupler 303, and is connected to a receiving pin of the radio frequency transceiver 301 through a respective coupler 303, a coupling end of each coupler 303 is connected to a gating end of the single-pole multi-throw isolating switch 302 through a respective power detection path 304, a common end of the single-pole multi-throw isolating switch 302 is connected to the power detection pin through a power detection path 304 to communicate the power detection pin with the power detection path 304 led out from each coupler 303, and the single-pole multi-throw isolating switch 302 is used for increasing isolation between the antennas 305. The number of couplers 303 may be the same as the number of antennas 305, and the number of gated ends may be the same as the number of single pole, multi-throw isolators 302. The transmission frequency band of each antenna 305 may be different.
Specifically, the receiving pins of the radio frequency transceiver 301 include a main set receiving pin and a diversity receiving pin, and correspondingly, the antenna 305 has at least a main set radio frequency antenna and a diversity radio frequency antenna, the main set radio frequency antenna is connected to the main set receiving pin through a coupler, and the diversity radio frequency antenna is connected to the diversity receiving pin through a coupler.
In a specific embodiment, the receiving pins of the radio frequency transceiver 301 include a main set receiving pin and a diversity receiving pin, the main set receiving pin includes a main set high frequency receiving pin and a main set low frequency receiving pin, the power detection circuit includes three radio frequency circuits, as shown in fig. 4, the main set high frequency circuit, the main set low frequency circuit and the diversity low frequency circuit are respectively provided, an antenna in the main set high frequency circuit is a main set high frequency antenna 3051, an antenna in the main set low frequency circuit is a main set low frequency antenna 3052, an antenna in the diversity low frequency circuit is a diversity low frequency antenna 3053, the power detection circuit includes three couplers, which are respectively a first coupler 3031, a second coupler 3032 and a third coupler 3033, the power detection circuit includes four power detection paths, which are respectively a first power detection path 3041, a second power detection path 3042, a third power detection path 3043, A fourth power detection path 3044, where the single-pole, multi-throw isolator 302 is a single-pole, three-throw isolator; the main set high-frequency antenna 3051 is connected to a main set high-frequency receiving pin through a first coupler 3031, the main set low-frequency antenna is connected to a main set low-frequency pin through a second coupler 3032, the diversity low-frequency antenna 3053 is connected to a diversity low-frequency pin through a third coupler 3033, a coupling end of the first coupler 3031 is connected to a first gating end of a single-pole three-throw isolating switch through a first power detection path 3041, a coupling end of the second coupler 3032 is connected to a second gating end of the single-pole three-throw isolating switch through a second power detection path 3042, a coupling end of the third coupler 3033 is connected to a third gating end of the single-pole three-throw isolating switch through a third power detection path 3043, and a common end of the single-pole three-throw isolating switch is connected to the power detection pin through a fourth power detection path 3044. In other embodiments, the main rf antenna set may include a main rf antenna set, and the like, and the main rf antenna set and the diversity rf antenna are not limited to the embodiment.
Further, as shown in fig. 4, the main set low frequency receiving pin includes a first main set receiving pin (e.g., the PRX1 pin in fig. 4) and a second main set receiving pin (e.g., the PRX2 pin in fig. 4), the main set low frequency circuit further includes a single-pole three-throw switch 306, a band pass filter 307, a low pass filter 308, and a duplexer 309, the main set low frequency antenna 3052 is connected to the common terminal of the single-pole three-throw switch 306 through the first coupler 3032, a gate terminal of the single-pole three-throw switch is connected to the first main set receiving pin through the low pass filter 308 and the duplexer 309 in sequence, and the other gate terminal of the single-pole three-throw switch 306 is connected to the second main set receiving pin through the band pass filter 307. The single pole, triple throw switch 306 includes a common terminal and three pass terminals.
As shown in fig. 4, the main set high frequency receiving pin includes a third main set receiving pin (e.g., the PRX4 pin in fig. 4) and a fourth main set receiving pin (e.g., the PRX5 pin in fig. 4), the main set high frequency circuit further includes a single-pole double-throw switch 310, a band pass filter 311, and a duplexer 312, the main set high frequency antenna 3051 is connected to the common terminal of the single-pole double-throw switch 310 through the second coupler 3031, a gate terminal of the single-pole double-throw switch 310 is connected to the third main set receiving pin through the band pass filter 311, and another gate terminal of the single-pole double-throw switch 310 is connected to the fourth main set receiving pin through the duplexer 312. The single pole, double throw switch 310 includes a common terminal and two pass terminals.
As shown in fig. 4, the diversity receiving pins include a first diversity receiving pin (e.g., DRX1 pin in fig. 4), a second diversity receiving pin (e.g., DRX2 pin in fig. 4), a third diversity receiving pin (e.g., DRX3 pin in fig. 4), and a fourth diversity receiving pin (e.g., DRX4 pin in fig. 4), the diversity low frequency circuit includes a single-pole four-throw switch 313, three band pass filters (314, 315, 316), and a duplexer 317, the diversity low frequency antenna 3053 is connected to the single-pole four-throw switch 313 through a third coupler 3033, three of the gating terminals of the single-pole four-throw switch 313 are connected to the first diversity receiving pin, the third diversity receiving pin, and the fourth diversity receiving pin through the band pass filters (314, 315, 316), and the remaining one gating terminal is connected to the second diversity receiving pin through the duplexer 317. The single pole, four throw switch 313 includes a common terminal and four pass terminals.
In the embodiment of the present invention, couplers 303 having the same coupling coefficient may be selected, and in other embodiments, couplers having different coupling systems may be selected.
In the embodiment of the present invention, for the single-pole multi-throw isolating switch 302, the number of pass terminals may be greater than or equal to the number of couplers. In one embodiment, the isolation of the single-pole, multi-throw isolator switch 302 is such that the carrier-to-noise ratio of each power sense path is no less than 24 dB. This is because the carrier-to-noise ratio (c/n) value for power detection is 24dB minimum for calibration platforms such as high-pass or MTK platforms, which are commonly used for power calibration.
Therefore, the isolation of the single-pole multi-throw isolating switch needs to enable the carrier-to-noise ratio value of the power detection path to meet the requirement. The carrier-to-noise ratio value of the power detection path is equal to the difference value between the power coupled to the power detection path by the antenna and the power coupled to the power detection path by the antenna, wherein the power coupled to the power detection path by the antenna is equal to the actual output power of the antenna minus the coupling coefficient of the antenna coupler, the power coupled to the power detection path by the antenna is equal to the actual output power of the antenna minus the isolation of the two antennas, the coupling coefficient of the coupler of the other antenna is subtracted, and the isolation of the isolation switch is subtracted. It can be concluded that the carrier-to-noise ratio of the power detection path is equal to the isolation of the two antennas plus the difference between the coupling coefficients of the two couplers plus the isolation of the isolator. Difference between the two coupler coupling coefficients the coupler coupling coefficient of the other antenna minus the value of the coupler coefficient of that antenna.
For example, referring to fig. 4, the main set high frequency antenna 3051 and the main set low frequency antenna 3051 are disposed on the same side of the rf transceiver, and have relatively large interference therebetween. If the actual output power of main set low frequency antenna 3052 is XdBm, if the coupling coefficient of each coupler in fig. 4 is 25dB, the isolation between each port of the single-pole-triple-throw isolator is 25dB, the isolation between main set low frequency antenna 3052 and main set high frequency antenna 3051 is 10dB, the power of the coupling end of coupler 3032 of main set low frequency antenna 3052 is (X-25) dBm, that is, the power of main set low frequency antenna 3052 coupled to power detection path 3041 is (X-25) dBm; if the power coupled from main set low-frequency antenna 3052 to main set high-frequency antenna 3051 is (X-10) dBm, then the interference signal from power detection path 3041 coupled from main set low-frequency antenna 3052 to main set high-frequency antenna 3051 is at least X-10-25-25 ═ X-60 dBm, then the carrier-to-noise ratio of power detection path 3041 on main set low-frequency antenna 3052 is (X-25) - (X-60) ═ 35dB when detecting the actual output power of main set low-frequency antenna 3052, and the isolator switch for this isolation obviously satisfies the condition compared to the lowest carrier-to-noise ratio value equal to 24 dB.
Therefore, in the power detection circuit, the single-pole multi-throw isolating switch 302 is introduced to increase the isolation between the antennas 305, thereby improving the carrier-to-noise ratio of the power detection path 304, ensuring the power detection accuracy of the power detection pin, improving the calculation accuracy of the actual output power of the antenna 305, reducing the power calibration deviation, and improving the power calibration accuracy. The presence of the line differential loss and attenuation network on the power detection path 304 prevents damage to the rf transceiver due to excessive power.
The embodiment of the present invention further provides a wireless communication terminal, including the power detection circuit according to any of the above embodiments. The wireless communication terminal can be a mobile phone or a tablet computer and the like.
The power detection circuit in the wireless communication terminal of the embodiment of the invention introduces the single-pole multi-throw isolating switch, not only can realize power detection, but also can increase the isolation between the antennas and improve the carrier-to-noise ratio of a power detection path, thereby improving the correctness of power detection of the power detection pin, improving the correctness of actual output power calculation of the antennas, reducing power calibration deviation and improving the precision of power calibration.
The embodiment of the invention also provides a power calibration method, which comprises the following steps of 502 to 508:
step 502: obtaining the power detected by the power detection pin in the power detection circuit, as shown in fig. 3, the power detection circuit includes: the radio frequency transceiver 301 comprises a radio frequency transceiver 301, a single-pole multi-throw isolating switch 302, more than two radio frequency circuits, more than two couplers 303 and more than two power detection paths 304, wherein each radio frequency circuit comprises an antenna 305, and the radio frequency transceiver 301 comprises a power detection pin and a receiving pin; each antenna 305 is provided with a coupler 303, and is connected to a receiving pin of the radio frequency transceiver 301 through a respective coupler 303, a coupling end of each coupler 303 is connected to a gating end of the single-pole multi-throw isolating switch 302 through a respective power detection path 304, a common end of the single-pole multi-throw isolating switch 302 is connected to the power detection pin through a power detection path 304 to communicate the power detection pin with the power detection path 304 led out from each coupler 303, and the single-pole multi-throw isolating switch 302 is used for increasing isolation between the antennas 305.
The specific limitations of the power detection circuit are as described above and will not be described herein. The single-pole, multi-throw isolator 302 selects which power sense path 304 is conducting and the power sensed by the power sense pin is used to calculate the actual output power of the antenna 305 on the corresponding path. For example, as shown in fig. 4, the gating terminal in the middle of the single-pole-three-throw isolating switch 302 is connected to the common terminal, which illustrates that the power detection path 3041 of the main set high-frequency antenna 3051 is connected to the power detection pin, and the power detected by the power detection pin is used to calculate the actual output power of the main set high-frequency antenna 3051.
Step 504: and calculating the power of a coupling end according to the power detected by the power detection pin, wherein the power of the coupling end is equal to the power detected by the power detection pin plus the coupling differential loss between the coupler and the power detection pin.
The coupling loss of this power sense path from the coupler to the power sense pin may be calibrated. The coupling loss generally includes line loss and attenuation network.
Step 506: and calculating the actual output power of the antenna according to the coupling end power, wherein the actual output power is equal to the coupling end power plus the coupling coefficient.
For example, as shown in fig. 4, the coupling coefficient of the coupler on the main set low frequency antenna is 25dB, the coupling difference loss of the power detection path from the coupler to the power detection pin is 9dB, the power detected by the power detection pin is-10 dBm, and the actual output power of the antenna is calculated to be-10 +34 dBm.
Step 508: the deviation of the actual output power of the antenna from the target output power of the antenna is calibrated.
In this step, the radio frequency transceiver uploads the power detected by the power detection pin to the power calibration platform, and the platform calculates the actual output power of the antenna and then calibrates the actual output power of the antenna with the target output power of the antenna, and if the calibration deviation is large, the adjustment is performed. For example, adjusting the power detection path until the calibration accuracy reaches a preset value.
According to the power calibration method in the embodiment of the invention, based on the power detection circuit, the power detection pin can detect power, and the actual output power of the antenna can be converted by combining the coupling coefficient of the coupler and the coupling difference loss between the coupler and the power detection pin. Due to the fact that the single-pole multi-throw isolating switch is introduced, power detection on each power detection path can be achieved, isolation between the antennas can be increased, the carrier-to-noise ratio of the power detection paths is improved, and therefore correctness of power detection of the power detection pins is improved, accuracy of actual output power of the obtained antennas is high, and calibration accuracy can be improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A power detection circuit, the power detection circuit comprising: the radio frequency circuit comprises an antenna, and the radio frequency transceiver comprises a power detection pin and a receiving pin;
each antenna is provided with a coupler and is connected to a receiving pin of the radio frequency transceiver through the respective coupler, the coupling end of each coupler is respectively connected with the gating end of the single-pole multi-throw isolating switch through the respective power detection path, the common end of the single-pole multi-throw isolating switch is connected with the power detection pin through a power detection path so as to communicate the power detection pin with the power detection paths led out from the respective couplers, and the single-pole multi-throw isolating switch is used for increasing the isolation degree among the antennas;
the receiving pins of the radio frequency transceiver comprise a main set receiving pin and a diversity receiving pin, the antenna comprises a main set radio frequency antenna and a diversity radio frequency antenna, the number of the couplers is the same as that of the antennas, the main set radio frequency antenna is connected to the main set receiving pin through the couplers, and the diversity radio frequency antenna is connected to the diversity receiving pin through the couplers;
the power detection circuit comprises three couplers which are respectively a first coupler, a second coupler and a third coupler, the power detection circuit comprises four power detection paths which are respectively a first power detection path, a second power detection path, a third power detection path and a fourth power detection path, and the single-pole multi-throw isolating switch is a single-pole three-throw isolating switch;
the high-frequency antenna of the main set is connected with a high-frequency receiving pin of the main set through a first coupler, the low-frequency antenna of the main set is connected with a low-frequency pin of the main set through a second coupler, the low-frequency antenna of the diversity is connected with a low-frequency pin of the diversity through a third coupler, a coupling end of the first coupler is connected with a first gating end of the single-pole three-throw isolating switch through a first power detection path, a coupling end of the second coupler is connected with a second gating end of the single-pole three-throw isolating switch through a second power detection path, a coupling end of the third coupler is connected with a third gating end of the single-pole three-throw isolating switch through a third power detection path, and the single-pole three-throw isolating switch is connected with the power detection pin through a fourth power detection path.
2. The power detection circuit of claim 1, wherein the single-pole multi-throw isolator has an isolation such that a carrier-to-noise ratio of each power detection path is not less than 24dB, the carrier-to-noise ratio of a power detection path is equal to a difference between a power coupled to the power detection path by an antenna and a power coupled to another antenna by the antenna, wherein the antenna coupler coupling coefficient is subtracted from an actual output power of the power antenna coupled to the power detection path, and the isolation of the two antennas is subtracted from an actual output power of the antenna coupled to another antenna, and the coupling coefficient of the coupler of the another antenna is subtracted from the isolation of the isolator.
3. The power detection circuit of claim 1 or 2, wherein the number of branch terminals of the single-pole multi-throw isolating switch is equal to the number of antennas.
4. The power detection circuit according to claim 1, wherein the main set low frequency receiving pins comprise a first main set receiving pin and a second main set receiving pin, the main set high frequency circuit further comprises a single-pole three-throw switch, a low pass filter, a band pass filter and a duplexer, the main set high frequency antenna is connected with a common terminal of the single-pole three-throw switch through a first coupler, a gating terminal of the single-pole three-throw switch is connected with the first main set receiving pin through the low pass filter and the duplexer in sequence, and the other gating terminal of the single-pole three-throw switch is connected with the second main set receiving pin through the band pass filter.
5. The power detection circuit of claim 1, wherein the main set high frequency receiving pins comprise a third main set receiving pin and a fourth main set receiving pin, the main set low frequency circuit further comprises a single-pole-two-throw switch, a band pass filter and a duplexer, the main set low frequency antenna is connected to the common terminal of the single-pole-two-throw switch through the second coupler, a gate terminal of the single-pole-two-throw switch is connected to the third main set receiving pin through the band pass filter, and the other gate terminal of the single-pole-two-throw switch is connected to the fourth main set receiving pin through the duplexer.
6. The power detection circuit of claim 1, wherein the diversity reception pins comprise a first diversity reception pin, a second diversity reception pin, a third diversity reception pin, and a fourth diversity reception pin, the diversity low frequency circuit comprises a single-pole four-throw switch, three band pass filters, and a duplexer, the diversity low frequency antenna is connected to a common terminal of the single-pole four-throw switch through a third coupler, three of the gating terminals of the single-pole four-throw switch are respectively connected to the first diversity reception pin, the third diversity reception pin, and the fourth diversity reception pin through respective band pass filters, and the remaining one of the gating terminals is connected to the second diversity reception pin through the duplexer.
7. A wireless communication terminal, characterized in that it comprises a power detection circuit according to any of claims 1-6.
8. A method of power calibration, comprising:
obtaining power detected by a power detection pin in a power detection circuit, wherein the power detection circuit comprises: the radio frequency circuit comprises an antenna, and the radio frequency transceiver comprises a power detection pin and a receiving pin; each antenna is provided with a coupler and is connected to a receiving pin of the radio frequency transceiver through the respective coupler, the coupling end of each coupler is respectively connected with the gating end of the single-pole multi-throw isolating switch through the respective power detection path, the common end of the single-pole multi-throw isolating switch is connected with the power detection pin through a power detection path so as to communicate the power detection pin with the power detection paths led out from the respective couplers, and the single-pole multi-throw isolating switch is used for increasing the isolation degree among the antennas;
the receiving pins of the radio frequency transceiver comprise a main set receiving pin and a diversity receiving pin, the antenna comprises a main set radio frequency antenna and a diversity radio frequency antenna, the number of the couplers is the same as that of the antennas, the main set radio frequency antenna is connected to the main set receiving pin through the couplers, and the diversity radio frequency antenna is connected to the diversity receiving pin through the couplers;
the power detection circuit comprises three couplers which are respectively a first coupler, a second coupler and a third coupler, the power detection circuit comprises four power detection paths which are respectively a first power detection path, a second power detection path, a third power detection path and a fourth power detection path, and the single-pole multi-throw isolating switch is a single-pole three-throw isolating switch;
the main set high-frequency antenna is connected with a main set high-frequency receiving pin through a first coupler, the main set low-frequency antenna is connected with a main set low-frequency pin through a second coupler, the diversity low-frequency antenna is connected with a diversity low-frequency pin through a third coupler, the coupling end of the first coupler is connected with the first gating end of the single-pole three-throw isolating switch through a first power detection path, the coupling end of the second coupler is connected with the second gating end of the single-pole three-throw isolating switch through a second power detection path, the coupling end of the third coupler is connected with the third gating end of the single-pole three-throw isolating switch through a third power detection path, and the single-pole three-throw isolating switch is connected with the power detection pin through a fourth power detection path;
calculating the power of a coupling end according to the power detected by a power detection pin, wherein the power of the coupling end is equal to the power detected by the power detection pin plus the coupling differential loss between a coupler and the power detection pin;
calculating the actual output power of the antenna according to the coupling end power, wherein the actual output power is equal to the coupling end power plus a coupling coefficient;
the deviation of the actual output power of the antenna from the target output power of the antenna is calibrated.
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