CN212324100U - Power detection circuit and terminal equipment - Google Patents
Power detection circuit and terminal equipment Download PDFInfo
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- CN212324100U CN212324100U CN202021415926.4U CN202021415926U CN212324100U CN 212324100 U CN212324100 U CN 212324100U CN 202021415926 U CN202021415926 U CN 202021415926U CN 212324100 U CN212324100 U CN 212324100U
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Abstract
The utility model provides a power detection circuit and terminal equipment, this power detection circuit includes: n antennas; the input ends of the N couplers are connected with the N antennas in a one-to-one correspondence manner; the first ends of the N radio frequency modules are respectively connected with the output ends of the N couplers in a one-to-one correspondence manner; the power detection module is arranged in the radio frequency transceiver, N signal receiving ends of the radio frequency transceiver are connected with the signal output ends of the N radio frequency modules in a one-to-one correspondence manner, and N signal transmitting ends of the radio frequency transceiver are connected with the signal input ends of the N radio frequency modules in a one-to-one correspondence manner; the M attenuation networks are connected with the coupling ends of the N couplers through the switch module, the M attenuation networks are also connected with the power detection module, and the couplers with the same coupling degree in the N couplers correspond to the same attenuation network in the M attenuation networks. The embodiment of the utility model provides a reducible decay network quantity and PCB area occupied.
Description
Technical Field
The utility model relates to the field of communication technology, especially, relate to a power detection circuit and terminal equipment.
Background
In the prior art, a radio frequency power detection method for a terminal device generally includes coupling a signal magnitude on a radio frequency module to a power detection module in a radio frequency transceiver through a coupler, converting different powers into corresponding analog-to-digital conversion ADC values, and storing a corresponding relationship between the power and the ADC values in the terminal device, so that the terminal device can determine the corresponding power magnitude by detecting the ADC values of the radio frequency module, thereby facilitating the calling of different power levels. Power detection is also important in mobile network applications, such as 5G networks, which are currently developing at a rapid pace.
At present, 5G terminal equipment is generally configured with multiple radio frequency modules working in different frequency bands, because a power detection module generally has a dynamic power detection range, i.e. a range with relatively accurate power detection precision, if the dynamic power detection range is-15 dbm to 5dbm, the power detection of the terminal equipment in an interval of 20db is relatively accurate. The radio frequency power range of each radio frequency module in the terminal equipment is about 8-28 dbm, in order to ensure that the power within the range can be accurately detected, firstly, certain attenuation needs to be performed on the radio frequency power of the terminal equipment, for example, the radio frequency emission power reaches 29dbm, the coupling degree of the coupler is assumed to be 20db, under the condition that Printed Circuit Board (PCB) wiring and the like are not considered, the power of an emission signal after being coupled by the coupler is 9dbm, so that the detection precision requirement of the power detection module can be met only by attenuating 4db, and the process is also called power calibration.
However, since the operating frequency bands of the radio frequency modules in the terminal device are different, the coupling degrees of the couplers of the radio frequency modules are also different, and further, the attenuation values required by the radio frequency modules are also different, for example, for a terminal device having 8 radio frequency modules, the coupling degrees of the radio frequency modules 1 to 4 are 20db, and the coupling degrees of the radio frequency modules 5 to 8 are 10db, when the radio frequency power is calibrated to 28dbm, the power detection circuits of the radio frequency modules 1 to 4 need to be attenuated by 3db, and the power detection circuits of the radio frequency modules 5 to 8 need to be attenuated by 13db, so that more accurate power detection can be realized.
For the above situation, in the existing scheme, corresponding attenuation networks are usually set in each radio frequency module based on different attenuation value requirements of each radio frequency module, and when there are more radio frequency modules and the coupling degree difference is larger, the number of attenuation networks involved is also increased, which results in setting a larger number of attenuation networks and occupying a larger PCB area.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a power detection circuit and terminal equipment to decay network quantity is too much among the current power detection circuit of solution, occupies the problem of great PCB area.
In order to solve the technical problem, the utility model discloses a realize like this:
in a first aspect, an embodiment of the present invention provides a power detection circuit, including:
n antennas, wherein N is an integer greater than 1;
the input ends of the N couplers are correspondingly connected with the N antennas one by one;
the first ends of the N radio frequency modules are respectively connected with the output ends of the N couplers in a one-to-one correspondence manner;
the radio frequency transceiver is internally provided with a power detection module, N signal receiving ends of the radio frequency transceiver are connected with signal output ends of the N radio frequency modules in a one-to-one correspondence manner, and N signal transmitting ends of the radio frequency transceiver are connected with signal input ends of the N radio frequency modules in a one-to-one correspondence manner;
the M attenuation networks are connected with the coupling ends of the N couplers through a switch module, and are also connected with the power detection module, wherein the couplers with the same coupling degree in the N couplers correspond to the same attenuation network in the M attenuation networks, M is a positive integer less than or equal to L, L is the number of different coupling degrees in the N couplers, L is an integer greater than or equal to 2, and the M attenuation networks have L attenuation values.
In a second aspect, an embodiment of the present invention provides a terminal device, including the embodiment of the present invention provides a power detection circuit.
The embodiment of the utility model provides an in, there is the condition of difference to the degree of coupling that each radio frequency module corresponds among N radio frequency modules, adopts the scheme to the multiplexing same decay network of the radio frequency access that the degree of coupling is the same to compare the scheme that sets up corresponding decay network to every radio frequency module respectively among the prior art, the embodiment of the utility model provides a can reach and reduce decay network quantity, and then reduce PCB area occupied's purpose.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a circuit structure diagram of a power detection circuit according to an embodiment of the present invention;
fig. 2 is a circuit structure diagram of another power detection circuit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a radio frequency module integrated with a coupler according to an embodiment of the present invention;
fig. 4 is a circuit diagram of an adjustable attenuation network according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1 and 2, fig. 1 and 2 are two different circuit structure diagrams of a power detection circuit provided by an embodiment of the present invention, and as shown in fig. 1 and 2, the power detection circuit includes:
the input ends of the N couplers 12 are connected with the N antennas 11 in a one-to-one correspondence manner;
the first ends of the N radio frequency modules 13 are respectively connected with the output ends of the N couplers 12 in a one-to-one correspondence manner;
a power detection module is arranged in the radio frequency transceiver 14, N signal receiving ends of the radio frequency transceiver 14 are connected with signal output ends of the N radio frequency modules 13 in a one-to-one correspondence manner, and N signal transmitting ends of the radio frequency transceiver 14 are connected with signal input ends of the N radio frequency modules 13 in a one-to-one correspondence manner;
m attenuation networks connected to the coupling ends of the N couplers 12 via a switch module 16, the M attenuation networks further connected to the power detection module, wherein couplers with the same coupling degree among the N couplers 12 correspond to the same attenuation network among the M attenuation networks, M is a positive integer smaller than or equal to L, L is the number of different coupling degrees among the N couplers 12, L is an integer greater than or equal to 2, and the M attenuation networks have L attenuation values.
In fig. 1 and 2, N is 8, which is used as a schematic diagram, that is, 8 rf paths are provided in the power detection circuits shown in fig. 1 and 2.
The power detection circuit provided in the embodiment of the present invention is suitable for a scene of detecting radio frequency power of multiple radio frequency paths, each radio frequency path includes an antenna, a coupler and a radio frequency module, that is, the power detection circuit is provided with multiple antennas, multiple couplers and multiple radio frequency modules, and specifically, see fig. 1 or fig. 2, the power detection circuit includes N antennas 11, N couplers 12, N radio frequency modules 13 and a radio frequency transceiver 14, which form N radio frequency paths, wherein each radio frequency path includes an antenna 11, a coupler 12 and a radio frequency module 13, each radio frequency module 13 includes a first end, a signal input end and a signal output end, and for each radio frequency path, the antenna 11 is connected with an input end of the coupler 12, an output end of the coupler 12 is connected with the first end of the radio frequency module 13, the signal input end of the rf module 13 is connected to a signal transmitting end of the rf transceiver 14, and the signal output end of the rf module 13 is connected to a signal receiving end of the rf transceiver 14.
The circuit structure of the rf module 13 may be as shown in fig. 3, and includes a filter 131, a switch 132, a receiving RX low-noise amplifier 133, and a transmitting TX amplifier 134, where the filter 131 is configured to filter an interference signal in a path, that is, to suppress a signal outside an operating frequency band of the path, the RX low-noise amplifier 133 is configured to amplify a received signal, the TX amplifier 134 is configured to amplify a transmitted signal, and the rf module 13 may be switched to a signal transmitting path or a signal receiving path under the action of the switch 132, that is, the rf module 13 may be used for both transmitting a signal and receiving a signal.
The first end of the rf module 13 is the end connected to the filter 131, the signal input end of the rf module 13 is the end connected to the TX amplifier 134, and the signal output end of the rf module 13 is the end connected to the RX low noise amplifier 133, so that the signal transmitted by the rf transceiver 14 can be transmitted through the signal input end of the rf module 13 and the transmission path thereof, and the signal received by the rf module 13 can be transmitted to the signal receiving end of the rf transceiver 14 through the signal output end thereof.
The couplers 12 may be directional couplers, and the coupling end of each coupler 12 may be connected to the corresponding attenuation network via the switch module 16, so as to couple the rf signal of each rf path to the corresponding attenuation network, thereby facilitating calibration and detection of the rf power of the rf signal of each rf path.
Wherein each coupler of the N couplers 12 may be respectively integrated with a different rf module of the N rf modules 13. In order to further save the circuit space, as shown in fig. 3, the coupler 12 may be integrated in the rf module 13 to form a coupler-integrated rf module.
The rf transceiver 14 is configured to transmit and receive signals to implement a communication function, wherein a power detection module for detecting the rf power of each rf path may be integrated in the rf transceiver 14, that is, the N rf paths may share one power detection module.
In practical applications, for example, for 5G terminal devices, the operating frequency band is wide, wherein each rf path usually operates in different frequency bands, such as some operating in a 2.4GHz band, some operating in a 3.5G band, and some possibly operating in a 4.9G band, and thus the coupling degree of the coupler in each rf path may be different. When power detection is performed on each radio frequency path, the power of each radio frequency path is often calibrated first, so that the power of each radio frequency path is in a dynamic power detection range of the power detection module, that is, a range with relatively accurate power detection precision, and in view of different coupling degrees of each radio frequency path, power values of signals coupled from each radio frequency path are also different, and further amplitudes of the signals to be calibrated of each radio frequency path are also different.
Therefore, in the embodiment of the present invention, the number of different coupling degrees of N couplers 12 is L, that is, when there are L different coupling degrees in the N coupling degrees of N couplers 12, M attenuation networks whose number is not more than L can be set, and the M attenuation networks at least have L attenuation values.
Wherein, for the radio frequency paths with the same coupling degree, the same attenuation value may be allocated to the radio frequency paths, and specifically, there may be a plurality of different implementation manners, one of which may be to allocate the same attenuation network to the radio frequency paths with the same coupling degree, that is, the coupling ends of the couplers with the same coupling degree may be connected to the same attenuation network via the switch circuit 16, for example, for the radio frequency path 1 and the radio frequency path 2 with the same coupling degree, the couplers of the two may be connected to the attenuation network 1 via the switch circuit 16, and for the radio frequency path 3 and the radio frequency path 4 with the same coupling degree but different from the coupling degree of the radio frequency path 1 and the radio frequency path 2, the attenuation network 2 may be an independent attenuation network, or may be formed by connecting another attenuation network 3 in series with the attenuation network 1, i.e. the attenuation value of the attenuation network 2 is equal to the sum of the attenuation values of the attenuation network 3 and the attenuation network 1.
Secondly, only one adjustable attenuation network may be configured for each of the N rf paths, that is, each of the N couplers 12 may be connected to the same adjustable attenuation network through the switch circuit 16, but for the rf paths with the same coupling degree, when performing power measurement on any one of the same rf paths, the attenuation value of the adjustable attenuation network may be adjusted to the same attenuation value corresponding to the coupling degree thereof, for example, for the rf path 1 and the rf path 2 with the same coupling degree, when performing power measurement on the rf path 1 or the rf path 2, the attenuation value of the adjustable attenuation network may be adjusted to the attenuation value 1 corresponding to the coupling degree of the rf path 1 or the rf path 2, and for the rf path 3 and the rf path 4 with the same coupling degree but different from the coupling degree of the rf path 1 and the rf path 2, when performing power measurement on the rf path 3 or the rf path 4, the attenuation value of the adjustable attenuation network is adjusted to an attenuation value 2 corresponding to the degree of coupling between the two. Of course, for N rf paths having L different coupling degrees, a plurality of adjustable attenuation networks whose number does not exceed L may be configured for the N rf paths, and the attenuation value of each adjustable attenuation network may be adjusted to an attenuation value adapted to the coupling degree of the corresponding rf path.
The M attenuation networks are also connected with the power detection module, so that signals coupled with each radio frequency channel can be sent to the power detection module for more accurate power detection after attenuation calibration is carried out on the signals through the corresponding attenuation networks, and then the power of the radio frequency signals in each radio frequency channel is detected.
The switch module 16 is configured to control a communication relationship between the N radio frequency paths and the M attenuation networks, and specifically, may switch based on the attenuation networks corresponding to the radio frequency paths, and output, through the communication switching, the signals coupled by each coupler in the N couplers 12 to the corresponding attenuation networks for attenuation when performing power detection on each radio frequency path, so as to ensure that each radio frequency path is correspondingly attenuated according to the corresponding coupling degree, thereby ensuring accuracy of the power detection result of each radio frequency path. The switch modules 16 may be switches, and the number may be one or more, wherein for a scheme in which a plurality of attenuation networks are provided, one switch or a plurality of switches may be correspondingly provided for implementation, and for a scheme in which only one attenuation network is provided, only one switch may be provided for implementation.
It should be noted that the connection switching of the switch module 16 can be realized based on the control function of the controller, that is, the switch module 16 can be connected to the controller in the terminal device, and the connection and disconnection between the ends of the switch module 16 are controlled by the control signal sent by the controller, so as to realize the connection switching between the radio frequency paths and the attenuation network.
Optionally, M is equal to L, and the switch module 16 is a multi-way selector switch;
the multi-path change-over switch comprises M fixed ends and N + M-1 movable ends, wherein N movable ends in the N + M-1 movable ends are connected with the coupling ends of the N couplers 12 in a one-to-one correspondence mode, the M fixed ends are connected with the input ends of the M attenuation networks in a one-to-one correspondence mode, the output end of a first attenuation network in the M attenuation networks is connected with the power detection module, and the output ends of M-1 attenuation networks except the first attenuation network in the M attenuation networks are connected with M-1 movable ends except the N movable ends in the N + M-1 movable ends in a one-to-one correspondence mode.
In one embodiment, M may be equal to L, that is, a corresponding number of attenuation networks may be set based on the number of different coupling degrees of the N couplers 12, for example, 2 attenuation networks may be set for the case of having 2 different coupling degrees, and the 2 attenuation networks have corresponding 2 attenuation values, wherein the attenuation value of each attenuation network may be set based on the 2 different coupling degrees. In this embodiment, the switch module 16 is a multi-way switch, and the M attenuation networks may be connected to the N couplers 12 through the multi-way switch.
Specifically, the number of the attenuation networks is L, the multiway selector switch comprises M fixed ends and N + M-1 movable ends, wherein, the coupling ends of the N couplers 12 can be respectively connected with N movable ends in the N + M-1 movable ends in a one-to-one correspondence manner, the rest M-1 movable ends in the N + M-1 movable ends can be respectively connected with the output ends of L-1 attenuation networks in the L attenuation networks in a one-to-one correspondence manner, the input ends of the L-1 attenuation networks are respectively connected with M-1 movable ends in the M stationary ends in a one-to-one correspondence manner, and the rest 1 movable end in the M fixed ends is connected with the rest 1 attenuation network in the L attenuation networks, namely the input end of the first attenuation network, and the output end of the first attenuation network is connected with the power detection module.
The first attenuation network corresponds to P couplers with the same coupling degree in the N couplers 12, and when power detection is performed on a signal coupled by a first coupler in the P couplers, a first stationary end connected to the first attenuation network in the M stationary ends is communicated with a first moving end, and the stationary ends except the first stationary end in the M stationary ends are all in a disconnected state, where the first moving end is a moving end connected to the first coupler in the N moving ends;
a second attenuation network of the M-1 attenuation networks and the first attenuation network correspond to K couplers of the N couplers 12 having the same coupling degree, and when power detection is performed on a signal coupled by a second coupler of the K couplers, a second immobile end of the M immobile ends connected to the second attenuation network is communicated with a second mobile end, and the first immobile end is communicated with a third mobile end, where the second mobile end is a mobile end of the N mobile ends connected to the second coupler, and the third mobile end is a mobile end of the M-1 mobile ends connected to the second attenuation network.
It should be noted that the first coupler may be any one of the P couplers, the second attenuation network may be any one of the M-1 attenuation networks, and the second coupler coupling may be any one of the K couplers.
That is, in this embodiment, the first attenuation network may be configured to attenuate power of a signal coupled by any one of P couplers with the same coupling degree among the N couplers 12, and an attenuation value of the first attenuation network corresponds to the coupling degree of the P couplers.
When the power of the radio-frequency signal of the radio-frequency path coupled with the first coupler of the P couplers is detected, the stationary end connected with the first attenuation network in the M stationary ends can be communicated with the moving end connected with the first coupler in the N moving ends, and other stationary ends in the M stationary ends can be in a disconnected state, so that the signal coupled with the first coupler can be transmitted to the first attenuation network through the multi-way switch to attenuate a corresponding power value;
the second attenuation network and the first attenuation network may form an attenuation network with a larger attenuation value through serial connection, and are used to attenuate the signal power coupled by any one of K couplers with the same coupling degree among the N couplers 12, and the attenuation value after serial connection of the second attenuation network and the first attenuation network corresponds to the coupling degree of the K couplers.
And upon power detection of a radio frequency signal of a radio frequency path coupled by a second coupler of the K couplers, the stationary end of the M stationary ends connected to the second attenuation network may be communicated with the moving end of the N moving ends connected to the second coupler, and the immobile end connected with the first attenuation network in the M immobile ends can be communicated with the mobile end connected with the second attenuation network in the M-1 mobile ends, so that the signal coupled by the second coupler can be transmitted to the second attenuation network through the multi-way switch to be attenuated by a certain power value, the remaining power value is again transmitted via the multiplexer to the first attenuation network, so that, the corresponding power values can be attenuated successively by the second attenuation network and the first attenuation network.
Taking N-8 and M-L-2 shown in fig. 1 as an example, assuming that the coupling degree of the rf paths 1 to 4 is 20db, the coupling degree of the rf paths 5 to 8 is 10db, the dynamic power detection range of the power detection module is-15 dbm to 5dbm, and the rf power range of each rf module is 8dbm to 28 dbm.
Thus, when the radio frequency paths 1 to 4 are calibrated with the radio frequency power of 28dbm, the power of the radio frequency signal coupled by the coupler is 8dbm without considering the condition of PCB wiring and the like, the detection precision requirement of the power detection module can be met only by attenuating 3db, similarly, when the radio frequency paths 5 to 8 are calibrated with the radio frequency power of 28dbm, the power of the radio frequency signal coupled by the coupler is 18dbm, and the detection precision requirement of the power detection module can be met only by attenuating 13 db.
Therefore, 2 attenuation networks are required to be arranged to ensure that the radio frequency power of each radio frequency path can be detected accurately, the attenuation networks with the attenuation values of 3db are required to be distributed for the radio frequency paths 1 to 4, the attenuation networks with the attenuation values of 13db are required to be distributed for the radio frequency paths 5 to 8, and the 13db attenuation networks can be formed by connecting the attenuation networks of 3db and the attenuation networks of 10db in series.
As shown in fig. 1, the power detection circuit is provided with 8 antennas ANT1, ANT2, … and ANT8, 8 RF modules RF1, RF2, … and RF8, each RF module 13 is provided with a coupler 12 and 2 attenuation networks, which are respectively a 3db attenuation network 151 and a 10db attenuation network 152, and 1 double-pole 9-throw switch DP9T, i.e., the switch DP9T includes 2 stationary terminals and 9 moving terminals, wherein the couplers in the RF modules RF1 to RF8 are respectively connected to the moving terminals 1 to 8 of the switch DP9T in a one-to-one correspondence manner, the moving terminal 9 of the switch DP9T is connected to the output terminal of the 10db attenuation network 152, the stationary terminal 9 of the switch DP9T is connected to the input terminal of the 3db attenuation network 151, the stationary terminal 10 of the switch DP9T is connected to the input terminal of the 10db attenuation network 152, and the output terminal of the 3db attenuation network 151 is connected to the transceiver 14 in the RF module.
Thus, for the RF modules RF 1-RF 4, the signal power attenuation of the RF path of the corresponding one of the RF modules RF 1-RF 4 can be realized by 3db by connecting the immobile end 9 of the switch DP9T with any one of the mobile ends 1-4, wherein the immobile end 10 of the switch DP9T can be in an open state; for the RF modules RF 5-RF 8, the signal power of the RF path in which the corresponding RF module of the RF modules RF 5-RF 8 is located is attenuated by 10db and 3db sequentially, and then attenuated by 13db in total, by connecting the stationary terminal 10 of the switch DP9T with any one of the moving terminals 5-8, and connecting the stationary terminal 9 of the switch DP9T with the moving terminal 11.
According to the embodiment, accurate power detection of the N radio frequency paths can be achieved only by arranging one selector switch and L attenuation networks, the number of the attenuation networks is reduced compared with the existing scheme, and the occupied area of a PCB is reduced.
Optionally, M is equal to 1, the switch module 16 is a multi-path switch, and the attenuation network is an adjustable attenuation network;
the multi-way selector switch comprises 1 fixed end and N movable ends, the N movable ends are connected with the coupling ends of the N couplers 12 in a one-to-one correspondence mode, the fixed ends are connected with the input end of the adjustable attenuation network, and the output end of the adjustable attenuation network is connected with the power detection module.
In another embodiment, M may be equal to 1, that is, only 1 attenuation network may be set, and the attenuation network is an adjustable attenuation network with a variable attenuation value, and the adjustable attenuation network may obtain different attenuation values by adjusting a structural parameter, and specifically, for N radio frequency paths with L different coupling degrees, the adjustable attenuation network may obtain corresponding L attenuation values by adjusting, so as to ensure that the power attenuation requirement of the N radio frequency paths can be met only by one attenuation network. In this embodiment, the switch module 16 is a multi-way switch, and the adjustable attenuation network may be connected to the N couplers 12 through the multi-way switch.
Specifically, the multi-way switch includes 1 stationary terminal and N moving terminals, the coupling terminals of the N couplers 12 may be respectively connected to the N moving terminals in a one-to-one correspondence, the 1 stationary terminal may be connected to the input terminal of the adjustable attenuation network, and the output terminal of the adjustable attenuation network is connected to the power detection module.
When power detection is performed on a signal coupled by a third coupler of the N couplers 12, the stationary end is communicated with a fourth moving end, the fourth moving end is a moving end connected to the third coupler of the N moving ends, and an attenuation value of the adjustable attenuation network corresponds to a coupling degree of the third coupler.
It should be noted that the third coupler may be any one of the N couplers.
That is, in this embodiment, the adjustable attenuation network may be configured to perform power attenuation on a signal coupled by any one of the N couplers 12, and an attenuation value of the adjustable attenuation network may be correspondingly adjusted according to a coupling degree of a currently connected coupler.
When the power of the rf signal of the rf path coupled to the third coupler of the N couplers 12 is detected, the stationary end of the multi-way switch may be communicated with the moving end of the N moving ends connected to the third coupler, and the attenuation value of the adjustable attenuation network may be adjusted to an attenuation value corresponding to the coupling degree of the third coupler, so that the signal coupled to the third coupler may be transmitted to the adjustable attenuation network through the multi-way switch to attenuate a corresponding power value; the specific adjustment manner of the attenuation value of the adjustable attenuation network may be that, based on a pre-established correspondence between the coupling degree and the structural parameter, the structural parameter of the adjustable attenuation network is correspondingly adjusted, and the establishment process of the correspondence between the coupling degree and the structural parameter may be: based on L different coupling degrees of the N couplers, respectively calculating attenuation values corresponding to the coupling degrees, and determining corresponding structural parameters of the adjustable attenuation network based on the attenuation values, thereby establishing a corresponding relation between the coupling degrees and the structural parameters.
The adjustable attenuation network can be integrated in the multi-way switch, so that the PCB area occupied by the attenuation network is further reduced.
Taking N-8 and M-1 shown in fig. 2 as an example, L may be any integer from 2 to 8, assuming that the coupling degree of the rf paths 1 to 2 is 25db, the coupling degree of the rf paths 3 to 4 is 20db, the coupling degree of the rf paths 5 to 6 is 15db, the coupling degree of the rf paths 7 to 8 is 10db, the dynamic power detection range of the power detection module is-15 dbm to 5dbm, and the rf power range of each rf module is 8dbm to 28 dbm.
Thus, for rf paths 1 through 2, when calibrating rf power of 28dbm, without regard to PCB traces and the like, the power of the radio frequency signal after being coupled by the coupler is 3dbm, the attenuation is not needed, the detection precision requirement of the power detection module can be met, and similarly, for radio frequency paths 3 to 4, when the radio frequency power is calibrated to be 28dbm, the power of a radio frequency signal after being coupled by the coupler is 8dbm, the detection precision requirement of the power detection module can be met only by attenuating 3db, for the radio frequency paths 5 to 6, when the radio frequency power is calibrated to be 28dbm, the power of the radio frequency signal after being coupled by the coupler is 13dbm, the detection precision requirement of the power detection module can be met only by attenuating 8db, for the radio frequency paths 7 to 8, when the radio frequency power is calibrated to be 28dbm, the power of the radio frequency signal after being coupled by the coupler is 18dbm, and the detection precision requirement of the power detection module can be met only by attenuating 13 db.
For the above situation, an adjustable attenuation network with adjustable attenuation value may be set to ensure that the rf power of each rf path is accurately detected, and for rf paths 1 to 2, the attenuation value of the adjustable attenuation network needs to be adjusted to be 0db, for rf paths 3 to 4, the attenuation value of the adjustable attenuation network needs to be adjusted to be 3db, for rf paths 5 to 6, the attenuation value of the adjustable attenuation network needs to be adjusted to be 8db, and for rf paths 7 to 8, the attenuation value of the adjustable attenuation network needs to be adjusted to be 13 db.
As shown in fig. 2, the power detection circuit is provided with 8 antennas ANT1, ANT2, … and ANT8, 8 radio frequency modules RF1, RF2, … and RF8, each radio frequency module 13 is provided with a coupler 12, 1 single-pole 8-throw switch SP8T, that is, the switch SP8T includes 1 fixed terminal and 8 movable terminals, and 1 adjustable attenuation network 153, attenuation values of the adjustable attenuation network 153 can be adjusted to be 0db, 3db, 8db and 13db, and the adjustable attenuation network 153 can be integrally provided inside the switch SP8T, wherein the couplers 12 in the radio frequency modules RF1 to RF8 are connected with the movable terminals 1 to 8 of the switch SP8T in a one-to-one correspondence, the fixed terminal 9 of the switch SP8T is connected with an input terminal of the adjustable attenuation network 153, and an output terminal of the adjustable attenuation network is connected with the power detection module 153 in the radio frequency transceiver 14.
Thus, for the RF modules RF 1-RF 2, the signal power of the RF path in which the RF module RF1 or RF2 is located can be attenuated by connecting the stationary terminal 9 of the switch SP8T to the moving terminal 1 or 2 and adjusting the attenuation value of the adjustable attenuation network 153 to 0 db; for the radio frequency modules RF 3-RF 4, the attenuation of the signal power of the radio frequency path in which the radio frequency module RF3 or RF4 is located by 3db can be realized by communicating the stationary terminal 9 of the switch SP8T with the moving terminal 3 or 4 and adjusting the attenuation value of the adjustable attenuation network 153 to 3 db; for the radio frequency modules RF 5-RF 6, the attenuation of the signal power of the radio frequency path in which the radio frequency module RF6 or RF7 is located by 8db can be realized by communicating the stationary terminal 9 of the switch SP8T with the moving terminal 5 or 6 and adjusting the attenuation value of the adjustable attenuation network 153 to 8 db; for the RF modules RF 7-RF 8, the attenuation of the signal power of the RF path in which the RF module RF7 or RF8 is located by 13db can be achieved by communicating the stationary terminal 9 of the switch SP8T with the moving terminal 7 or 8 and adjusting the attenuation value of the adjustable attenuation network 153 to 13 db.
Of course, the attenuation network arrangement scheme shown in fig. 2 may also be applied to other situations with different coupling degrees, and even to a scene with different coupling degrees of each rf path, only the attenuation value of the adjustable attenuation network 153 needs to be correspondingly adjusted to the attenuation value corresponding to the coupling degree of the currently connected rf path.
The implementation mode is particularly suitable for power detection scenes with more radio frequency modules and more complicated coupling degree difference. In the embodiment, accurate power detection of the N-path radio frequency path can be realized only by arranging one selector switch and 1 adjustable attenuation network, and compared with the existing scheme and the scheme shown in figure 1, the number of the attenuation networks and the occupied area of a PCB are further reduced.
Optionally, the adjustable attenuation network 153 includes a first resistor, a second resistor and a third resistor, and at least one of the first resistor, the second resistor and the third resistor is an adjustable resistor.
That is, in this embodiment, the adjustable attenuation network 153 may be implemented by simply using three resistors, and at least one of the resistors is an adjustable resistor, so that the purpose of adjusting the attenuation value can be achieved by adjusting the resistance value of the adjustable resistor. For example, the adjustable attenuation network 153 may adopt a first resistor, a second resistor and a third resistor to form a pi-type attenuation network or a T-type attenuation network, and any one or more of the resistors may be selected as the adjustable resistor. The resistance values or the adjustable resistance value ranges of the three resistors can be selected correspondingly according to attenuation values needed to be used in practice.
Thus, the adjustable attenuation network in the embodiment has a relatively simple circuit structure, and is easy to realize the adjustment of the attenuation value.
Optionally, the first resistor, the second resistor and the third resistor form a pi-type attenuation network or a T-type attenuation network, wherein the first resistor and the third resistor have the same resistance value and are structurally symmetrical, and the second resistor is an adjustable resistor.
That is, in this embodiment, the adjustable attenuation network 153 may be a pi-type attenuation network or a T-type attenuation network composed of the first resistor, the second resistor and the third resistor, and in order to adjust the attenuation value, as shown in fig. 4, for the first resistor R1 and the third resistor R3 having symmetrical structures, resistors having the same resistance value may be selected, and for the second resistor R2, an adjustable resistor may be selected.
Taking the pi-type adjustable attenuation network shown in fig. 4 as an example, for a scene in which attenuation values of 0db, 3db, 8db and 13db need to be used, R1-R3-150 Ω and R2-adjustable resistor may be selected, when R2-0 Ω, the attenuation value of the adjustable attenuation network 153 is 0db, when R2-15 Ω, the attenuation value of the adjustable attenuation network 153 is 3db, when R3-57 Ω, the attenuation value of the adjustable attenuation network 153 is 8db, and when R2-130 Ω, the attenuation value of the adjustable attenuation network 153 is 13 db.
In this way, in this embodiment, the attenuation value adjustment method of the adjustable attenuation network is simple and easy to implement.
It should be noted that, for the embodiment of arranging M attenuation networks shown in fig. 1, each attenuation network may also be implemented by using three resistors, for example, a pi-type attenuation network or a T-type attenuation network may be formed by using three resistors with fixed resistance values based on the attenuation value of each attenuation network.
The embodiment of the utility model provides an in power detection circuit, to the coupling degree that each radio frequency module corresponds among N radio frequency modules the condition that has the difference, adopt the scheme to the multiplexing same decay network of the radio frequency route that the coupling degree is the same to compare and set up the scheme of corresponding decay network to every radio frequency module respectively among the prior art, the embodiment of the utility model provides a can reach and reduce decay network quantity, and then reduce PCB area occupied's purpose.
The embodiment of the utility model provides a still provide a terminal equipment, include the power detection circuit that provides as in any preceding embodiment. In this embodiment, the electronic device can achieve the same beneficial effects as any of the foregoing embodiments, and is not described herein again to avoid repetition.
In the embodiment of the present invention, the terminal device can be any device with communication function, for example: terminal devices such as computers (Computer), Mobile phones, Tablet Personal computers (Tablet Personal Computer), Laptop computers (Laptop Computer), Personal Digital Assistants (PDA), Mobile Internet Devices (MID), and Wearable devices (Wearable Device).
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention essentially or the portions contributing to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk), and includes a plurality of instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention.
Claims (10)
1. A power detection circuit, comprising:
n antennas, wherein N is an integer greater than 1;
the input ends of the N couplers are correspondingly connected with the N antennas one by one;
the first ends of the N radio frequency modules are respectively connected with the output ends of the N couplers in a one-to-one correspondence manner;
the radio frequency transceiver is internally provided with a power detection module, N signal receiving ends of the radio frequency transceiver are connected with signal output ends of the N radio frequency modules in a one-to-one correspondence manner, and N signal transmitting ends of the radio frequency transceiver are connected with signal input ends of the N radio frequency modules in a one-to-one correspondence manner;
the M attenuation networks are connected with the coupling ends of the N couplers through a switch module, and are also connected with the power detection module, wherein the couplers with the same coupling degree in the N couplers correspond to the same attenuation network in the M attenuation networks, M is a positive integer less than or equal to L, L is the number of different coupling degrees in the N couplers, L is an integer greater than or equal to 2, and the M attenuation networks have L attenuation values.
2. The power detection circuit of claim 1, wherein M is equal to L, and the switch module is a multi-way switch;
the multi-path change-over switch comprises M fixed ends and N + M-1 movable ends, wherein N movable ends in the N + M-1 movable ends are connected with coupling ends of the N couplers in a one-to-one correspondence mode, the M fixed ends are connected with input ends of the M attenuation networks in a one-to-one correspondence mode, an output end of a first attenuation network in the M attenuation networks is connected with the power detection module, and output ends of M-1 attenuation networks except the first attenuation network in the M attenuation networks are connected with M-1 movable ends except the N movable ends in the N + M-1 movable ends in a one-to-one correspondence mode.
3. The power detection circuit according to claim 2, wherein the first attenuation network corresponds to P couplers with the same coupling degree among the N couplers, and when power detection is performed on a signal coupled by a first coupler among the P couplers, a first stationary end, which is connected to the first attenuation network, among the M stationary ends is communicated with a first moving end, and the stationary ends, which are except the first stationary end, among the M stationary ends are all in an off state, wherein the first moving end is a moving end, which is connected to the first coupler, among the N moving ends;
a second attenuation network of the M-1 attenuation networks and the first attenuation network correspond to K couplers of the N couplers, and when power detection is performed on a signal coupled by a second coupler of the K couplers, a second stationary end of the M stationary ends connected to the second attenuation network is communicated with a second moving end, and the first stationary end is communicated with a third moving end, wherein the second moving end is a moving end of the N moving ends connected to the second coupler, and the third moving end is a moving end of the M-1 moving ends connected to the second attenuation network.
4. The power detection circuit of claim 1, wherein M is equal to 1, the switch module is a multi-way switch, and the attenuation network is an adjustable attenuation network;
the multi-way selector switch comprises 1 fixed end and N movable ends, the N movable ends are connected with the coupling ends of the N couplers in a one-to-one correspondence mode, the fixed ends are connected with the input end of the adjustable attenuation network, and the output end of the adjustable attenuation network is connected with the power detection module.
5. The power detection circuit of claim 4, wherein the adjustable attenuation network is integrally disposed in the multi-way switch.
6. The power detection circuit according to claim 4 or 5, wherein in the case of performing power detection on a signal coupled by a third coupler of the N couplers, the stationary terminal is communicated with a fourth moving terminal, the fourth moving terminal is a moving terminal connected with the third coupler of the N moving terminals, and an attenuation value of the adjustable attenuation network corresponds to a coupling degree of the third coupler.
7. The power detection circuit of claim 4 or 5, wherein the adjustable attenuation network comprises a first resistor, a second resistor, and a third resistor, and at least one of the first resistor, the second resistor, and the third resistor is an adjustable resistor.
8. The power detection circuit according to claim 7, wherein the first resistor, the second resistor and the third resistor form a pi-type attenuation network or a T-type attenuation network, wherein the first resistor and the third resistor which are structurally symmetrical have the same resistance, and the second resistor is an adjustable resistor.
9. The power detection circuit of claim 1, wherein each of the N couplers is integrated with a different one of the N rf modules.
10. A terminal device comprising the power detection circuit of any one of claims 1 to 9.
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| CN202021415926.4U CN212324100U (en) | 2020-07-17 | 2020-07-17 | Power detection circuit and terminal equipment |
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| CN202021415926.4U CN212324100U (en) | 2020-07-17 | 2020-07-17 | Power detection circuit and terminal equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116054967A (en) * | 2023-03-31 | 2023-05-02 | 荣耀终端有限公司 | Power detection circuit and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116054967A (en) * | 2023-03-31 | 2023-05-02 | 荣耀终端有限公司 | Power detection circuit and method |
| CN116054967B (en) * | 2023-03-31 | 2023-11-10 | 荣耀终端有限公司 | Power detection circuit and method |
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