CN218499131U - Radio frequency receiving circuit and terminal equipment - Google Patents
Radio frequency receiving circuit and terminal equipment Download PDFInfo
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- CN218499131U CN218499131U CN202222638863.4U CN202222638863U CN218499131U CN 218499131 U CN218499131 U CN 218499131U CN 202222638863 U CN202222638863 U CN 202222638863U CN 218499131 U CN218499131 U CN 218499131U
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Abstract
The utility model relates to the field of communication technology, the utility model provides a radio frequency receiving circuit and terminal equipment, this radio frequency receiving circuit is owing to there are first band pass filter and second band pass filter, and first frequency channel and the second that switches on the frequency channel and does not have intersection, then switch on when can realizing two radio frequency access, and then realize two radio frequency access's simultaneous working, there is not radio frequency switch in this radio frequency receiving circuit, radio frequency access switching need not carry out, not only can reduce because of the consumption that radio frequency switch introduced and circuit design's complexity, can also reduce cost. Moreover, the adopted first band-pass filter and the second band-pass filter have strong universality and are not limited by models.
Description
Technical Field
The utility model relates to the field of communication technology, especially, relate to a radio frequency receiving circuit and terminal equipment.
Background
With the rapid development of mobile communication technology, more and more frequency bands need to be supported by terminal equipment. Since the rf ports of the receiver are limited, a part of the rf band is required to share the rf ports of the receiver. In some cases, when the number of ports of the antenna switch is insufficient, a part of the rf frequency band is required to share the rf ports of the antenna switch. Therefore, the radio frequency receiving circuit of the dual-band shared radio frequency port is generated.
The existing radio frequency receiving circuit with dual-band sharing radio frequency ports usually adopts a radio frequency switch as a path for switching, or adopts a radio frequency diplexer to realize the sharing of the radio frequency ports. However, when the radio frequency switch is adopted, 1) two radio frequency paths cannot be conducted simultaneously, and the two radio frequency paths cannot work simultaneously; 2) The radio frequency switch is an active device, needs to supply power and control the switching of the switch, and can increase the power consumption and the complexity of circuit design; 3) The switching element is added, increasing the cost. The adoption of the rf diplexer is limited by the type of the rf diplexer, and the manufacturing process of the rf diplexer is relatively complicated, resulting in high cost.
Therefore, it is urgently needed to provide a new radio frequency receiving circuit.
SUMMERY OF THE UTILITY MODEL
The utility model provides a radio frequency receiving circuit and terminal equipment for solve the defect that exists among the prior art.
The utility model provides a radio frequency receiving circuit, include: the band-pass filter comprises a first band-pass filter with a first conducting frequency band and a second band-pass filter with a second conducting frequency band, and the first conducting frequency band and the second conducting frequency band are not intersected;
the input end of the first band-pass filter and the input end of the second band-pass filter are both connected with a radio frequency common end, and the radio frequency common end is used for being connected with a receiving antenna;
and the output end of the first band-pass filter and the output end of the second band-pass filter are both used for being connected with a receiver.
According to the utility model provides a radio frequency receiving circuit, still include first LC matching circuit and second LC matching circuit;
the input end of the first LC matching circuit is connected with the radio frequency common end, and the output end of the first LC matching circuit is connected with the input end of the first band-pass filter;
the input end of the second LC matching circuit is connected with the radio frequency common end, and the output end of the second LC matching circuit is connected with the input end of the second band-pass filter.
According to the utility model provides a radio frequency receiving circuit, the first LC matching circuit includes first electric capacity, second electric capacity and first inductance; a first end of the first capacitor is connected with the radio frequency common end, a second end of the first capacitor is connected with a first end of the second capacitor, and a second end of the second capacitor is connected with an input end of the first band-pass filter; a first end of the first inductor is connected with a second end of the first capacitor, and a second end of the first inductor is grounded;
and/or the second LC matching circuit comprises a second inductor, a third inductor and a third capacitor; a first end of the second inductor is connected with the radio frequency common end, a second end of the second inductor is connected with a first end of the third inductor, and a second end of the third inductor is connected with an input end of the second band-pass filter; and the first end of the third capacitor is connected with the second end of the second inductor, and the second end of the third capacitor is grounded.
According to the utility model provides a radio frequency receiving circuit, still include first receiver matching circuit and second receiver matching circuit;
the input end of the first receiver matching circuit is connected with the output end of the first band-pass filter, and the output end of the first receiver matching circuit is used for being connected with a first receiver;
the input end of the second receiver matching circuit is connected with the output end of the second band-pass filter, and the output end of the second receiver matching circuit is used for being connected with a second receiver.
According to the utility model provides a radio frequency receiving circuit, the first receiver matching circuit includes fourth electric capacity, fifth electric capacity, fourth inductance and fifth inductance; a first end of the fourth capacitor is connected with an output end of the first band-pass filter, a second end of the fourth capacitor is connected with a first end of the fourth inductor, and a second end of the fourth inductor is used for being connected with the first receiver; a first end of the fifth inductor is connected with a second end of the fourth capacitor, a second end of the fifth inductor is connected with a first end of the fifth capacitor, and a second end of the fifth capacitor is grounded;
and/or the second receiver matching circuit comprises a sixth capacitor, a seventh capacitor, a sixth inductor and a seventh inductor; a first end of the sixth capacitor is connected with an output end of the second band-pass filter, a second end of the sixth capacitor is connected with a first end of the sixth inductor, and a second end of the sixth inductor is used for being connected with the second receiver; a first end of the seventh inductor is connected to a second end of the sixth capacitor, a second end of the seventh inductor is connected to a first end of the seventh capacitor, and a second end of the seventh capacitor is grounded.
The utility model also provides a radio frequency receiving circuit, include: the band-pass filter comprises a first band-pass filter with a first conducting frequency band and a second band-pass filter with a second conducting frequency band, and the first conducting frequency band and the second conducting frequency band are not intersected;
the input end of the first band-pass filter and the input end of the second band-pass filter are respectively used for receiving radio frequency signals;
the output end of the first band-pass filter and the output end of the second band-pass filter are both connected with a radio frequency common end, and the radio frequency common end is used for being connected with a receiver.
According to the utility model provides a radio frequency receiving circuit, still include first LC matching circuit and second LC matching circuit;
the input end of the first LC matching circuit is connected with the output end of the first band-pass filter, and the output end of the first LC matching circuit is connected with the radio frequency common end;
the input end of the second LC matching circuit is connected with the output end of the second band-pass filter, and the output end of the second LC matching circuit is connected with the radio frequency common end.
According to the utility model provides a radio frequency receiving circuit, which also comprises a receiver matching circuit;
the input end of the receiver matching circuit is connected with the output end of the first LC matching circuit and the output end of the second LC matching circuit respectively, and the output end of the receiver matching circuit is connected with the radio frequency common end.
According to the utility model provides a radio frequency receiving circuit, still include eighth electric capacity and/or ninth electric capacity;
a first end of the eighth capacitor and a first end of the ninth capacitor are both used for receiving the radio frequency signal;
and the second end of the eighth capacitor is connected with the input end of the first band-pass filter, and the second end of the ninth capacitor is connected with the input end of the second band-pass filter.
The utility model also provides a terminal equipment, including receiver and foretell radio frequency receiving circuit, the receiver with radio frequency receiving circuit connects.
The utility model provides a radio frequency receiving circuit and terminal equipment, include: the antenna comprises a first band-pass filter with a first conduction frequency band and a second band-pass filter with a second conduction frequency band, wherein the first conduction frequency band and the second conduction frequency band are not intersected, the input ends of the first band-pass filter and the second band-pass filter are both connected with a radio frequency common end, and the radio frequency common end is used for being connected with a receiving antenna; the output end of the first band-pass filter and the output end of the second band-pass filter are both used for being connected with a receiver. The radio frequency receiving circuit has the advantages that due to the fact that the first band-pass filter and the second band-pass filter exist and the first conduction frequency band and the second conduction frequency band do not intersect, two radio frequency paths can be conducted simultaneously, and then simultaneous working of the two radio frequency paths is achieved. Moreover, the adopted first band-pass filter and the second band-pass filter have strong universality and are not limited by models.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a radio frequency receiving circuit in the prior art when a radio frequency switch is used as a path switching;
fig. 2 is a schematic structural diagram of a radio frequency receiving circuit when a radio frequency diplexer is used to implement radio frequency port sharing in the prior art;
fig. 3 is a schematic structural diagram of a radio frequency receiving circuit provided by the present invention;
fig. 4 is a second schematic structural diagram of the rf receiving circuit according to the present invention;
fig. 5 is a third schematic structural diagram of a radio frequency receiving circuit according to the present invention;
fig. 6 is a fourth schematic structural diagram of the rf receiving circuit provided by the present invention;
fig. 7 is a fifth schematic structural diagram of the rf receiving circuit provided by the present invention;
fig. 8 is a sixth schematic structural view of the rf receiving circuit provided by the present invention;
fig. 9 is a schematic structural diagram of a terminal device provided by the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present invention clearer, the drawings of the present invention are combined to clearly and completely describe the technical solutions of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The existing radio frequency receiving circuit with dual-band sharing radio frequency ports usually adopts a radio frequency switch as a path for switching, or adopts a radio frequency diplexer to realize the sharing of the radio frequency ports.
Fig. 1 shows a radio frequency receiving circuit when a radio frequency switch is used for switching paths, wherein a radio frequency switch U5 includes two frequency bands, which are RF1 and RF2, respectively, a capacitor C15 is connected between the RF1 and a radio frequency input terminal i 11, and a capacitor C20 is connected between the RF2 and a radio frequency input terminal ii 12. The radio frequency switch U5 further comprises a grounding terminal GND, an analog power supply VC and a digital power supply VDD, wherein the grounding terminal GND is grounded, the digital power supply VDD is connected with a capacitor three C17, the analog power supply VC is connected with a capacitor four C18, and the capacitor three C17 and the capacitor four C18 are both grounded. A port MB1_ PRX _ SW1 is connected between the analog power supply VC and the capacitor tetra C18, and a port VREG _ L18_2P7 is connected between the digital power supply VDD and the capacitor tri C17.
The radio frequency switch U5 further comprises a radio frequency output RFC connected to the radio frequency common 13.
Fig. 2 shows a radio frequency receiving circuit when a radio frequency Diplexer is used to implement radio frequency port sharing, where the radio frequency Diplexer 21 is a U8 Diplexer, the radio frequency Diplexer 21 includes a port bank _1900MHZ, a port bank _2017 \/U5 MHZ, and a port UNBALANCE _1900/2017 \/U5 MHZ, a capacitor five C21 is connected between the port bank _1900MHZ and the first radio frequency input terminal 11, and a capacitor six C22 is connected between the port bank _ 2017U 5MHZ and the second radio frequency input terminal 12. The UNBALANCE _1900/2017_5 MHZ port is connected with the radio frequency public terminal 13.
The radio frequency diplexer 21 further comprises seven grounding terminals, namely GND-1, GND-2, GND-3, GND-4, GND-5, GND-6 and GND-7.
The existing rf receiving circuit with dual-band shared rf port has various problems. Therefore, the embodiment of the present invention provides a novel rf receiving circuit to solve the technical problem of the rf receiving circuit with dual frequency bands sharing an rf port in the prior art.
Fig. 3 is a schematic structural diagram of a radio frequency receiving circuit provided in an embodiment of the present invention, as shown in fig. 3, the radio frequency receiving circuit includes a first band pass filter 4 having a first conduction frequency band and a second band pass filter 5 having a second conduction frequency band, and the first conduction frequency band and the second conduction frequency band do not intersect.
The input end of the first band-pass filter 4 and the input end of the second band-pass filter 5 are both connected with the radio frequency common end 3, and the radio frequency common end 3 is used for being connected with a receiving antenna;
the output of the first band-pass filter 4 and the output of the second band-pass filter 5 are both used for connection to a receiver.
Specifically, the embodiment of the present invention provides a radio frequency receiving circuit, which is composed of at least a first band pass filter 4 and a second band pass filter 5, a conduction band of the first band pass filter 4 is a first conduction band, a conduction band of the second band pass filter 5 is a second conduction band, and the first conduction band and the second conduction band do not intersect with each other, that is, there is no overlapping portion. Therefore, the conduction band with a large value can be called a high band, the corresponding band-pass filter is a high band-pass filter, the conduction band with a small value can be called a low band, and the corresponding band-pass filter is a low band-pass filter. For example, the first pass band may be a high band, the second pass band may be a low band, the first band pass filter 4 is a high band pass filter, and the second band pass filter 5 is a low band pass filter.
The input end of the first band-pass filter 4 and the input end of the second band-pass filter 5 may both be connected to the rf common 3, both input ends being used for inputting the rf signal received by the receiving antenna, and the rf common 3 may be connected to the receiving antenna. It is understood that, between the input end of the first band pass filter 4 and the rf common 3, and between the input end of the second band pass filter 5 and the rf common 3, an element for improving circuit performance or protecting a circuit may be connected, or may not be connected, and is not limited herein.
The first band-pass filter 4 may filter the input rf signal to obtain an rf signal in a first on-band, and the second band-pass filter 5 may filter the input rf signal to obtain an rf signal in a second on-band. Since the first conducting frequency band and the second conducting frequency band do not intersect with each other, the radio frequency signal in the first conducting frequency band is different from the radio frequency signal in the second conducting frequency band, and there is no intersection. Therefore, two paths of different radio frequency signals can be obtained through the radio frequency receiving circuit, and the application of the radio frequency common end is realized. Furthermore, as can be seen from fig. 3, the rf signal in the first conductive band and the rf signal in the second conductive band share the receiving antenna circuit.
The output end of the first band-pass filter 4 and the output end of the second band-pass filter 5 are both used for being connected with a receiver, as shown in fig. 3, and are respectively connected with a first radio frequency output end 41 and a second radio frequency receiving end 51 of the radio frequency receiving circuit. The first rf output terminal 41 and the second rf receiving terminal 51 are respectively configured to output the filtered rf signals in different frequency bands to an rf path of the receiver. Since there are two radio frequency signals in different frequency bands, the first radio frequency output end 41 and the second radio frequency receiving end 51 may be connected to different receivers respectively, and the different receivers are used for receiving radio frequency signals in corresponding frequency bands.
The embodiment of the utility model provides an in the radio frequency receiving circuit who provides, include: the antenna comprises a first band-pass filter with a first conduction frequency band and a second band-pass filter with a second conduction frequency band, wherein the first conduction frequency band and the second conduction frequency band are not intersected, the input ends of the first band-pass filter and the second band-pass filter are both connected with a radio frequency common end, and the radio frequency common end is used for being connected with a receiving antenna; the output end of the first band-pass filter and the output end of the second band-pass filter are both used for being connected with a receiver. The radio frequency receiving circuit has the advantages that due to the fact that the first band-pass filter and the second band-pass filter exist and the first conduction frequency band and the second conduction frequency band do not intersect, two radio frequency paths can be conducted simultaneously, and then simultaneous working of the two radio frequency paths is achieved. Moreover, the adopted first band-pass filter and the second band-pass filter have strong universality and are not limited by models.
On the basis of the above embodiment, as shown in fig. 4, the radio frequency receiving circuit provided in the embodiment of the present invention further includes a first LC matching circuit 6 and a second LC matching circuit 7;
the input end of the first LC matching circuit 6 is connected with the radio frequency common end 3, and the output end of the first LC matching circuit 6 is connected with the input end of the first band-pass filter 4;
the input end of the second LC matching circuit 7 is connected to the rf common 3, and the output end of the second LC matching circuit 7 is connected to the input end of the second band-pass filter 5.
Specifically, in the embodiment of the utility model provides an in, for the isolation between the radio frequency path that improves first band pass filter 4 and second band pass filter 5, can increase first LC matching circuit 6 and second LC matching circuit 7 to reduce the radio frequency signal's between two radio frequency paths degree of interference, reduce two way radio frequency signal's influence each other, improve the radio frequency signal's of output accuracy.
On the basis of the above embodiments, as shown in fig. 5, in the radio frequency receiving circuit provided in the embodiments of the present invention, the first LC matching circuit 6 includes a first capacitor C1, a second capacitor C2, and a first inductor L1; the first end of the first capacitor C1 is connected with the radio frequency common end 3, the second end of the first capacitor C1 is connected with the first end of the second capacitor C2, and the second end of the second capacitor C2 is connected with the input end of the first band-pass filter 4; a first end of the first inductor L1 is connected with a second end of the first capacitor C1, and a second end of the first inductor L1 is grounded;
and/or the second LC matching circuit 7 comprises a second inductor L4, a third inductor L5 and a third capacitor C5; a first end of the second inductor L4 is connected to the radio frequency common terminal 3, a second end of the second inductor L4 is connected to a first end of the third inductor L5, and a second end of the third inductor L5 is connected to an input terminal of the second band-pass filter 5; a first end of the third capacitor C5 is connected to the second end of the second inductor L4, and a second end of the third capacitor C5 is grounded.
Specifically, in the embodiment of the present invention, the first LC matching circuit 6 includes a first capacitor C1, a second capacitor C2 and a first inductor L1, the first capacitor C1 can be 22pf_020, the second capacitor C2 can be 3.3pf_0201, and the first inductor L1 can be set as required.
The second LC matching circuit 7 may include a second inductor L4, a third inductor L5, and a third capacitor C5, where the second inductor L4 may be 5.6nH, the third inductor L5 may be 3.3nH, and the third capacitor C5 may be 1.5pf_0201.
As shown in fig. 5, the input terminal of the first bandpass filter 4 is UNBAL21, the output terminal of the first bandpass filter 4 is UNBAL11, and the first bandpass filter 4 further includes three ground terminals GND1, GND2, and GND3. The input end of the second band-pass filter 5 is UNBAL22, the output end of the second band-pass filter 5 is UNBAL12, and the second band-pass filter 5 also comprises three grounding ends, namely GND1, GND2 and GND3. It can be seen that the first bandpass filter 4 and the second bandpass filter 5 have the same structure and differ only in the conduction band.
The embodiment of the utility model provides an in, give the concrete structure of first LC matching circuit and second LC matching circuit, this simple structure can reduce the cost that the radio frequency received under the condition of the isolation that improves two radio frequency passageways.
On the basis of the foregoing embodiment, as shown in fig. 5, the radio frequency receiving circuit provided in the embodiment of the present invention further includes a first receiver matching circuit 8 and a second receiver matching circuit 9;
the input end of the first receiver matching circuit 8 is connected with the output end of the first band-pass filter 4, and the output end of the first receiver matching circuit 8 is used for being connected with a first receiver;
an input of the second receiver matching circuit 9 is connected to an output of the second band-pass filter 5, and an output of the second receiver matching circuit 9 is for connection to a second receiver.
Specifically, in the embodiment of the present invention, for improving the matching degree between the radio frequency path of the first band pass filter and the radio frequency path of the second band pass filter and the corresponding receiver, the first receiver matching circuit 8 and the second receiver matching circuit 9 can be added to reduce the matching error of the radio frequency signal between the radio frequency path of the first band pass filter and the radio frequency path of the first receiver and the matching error of the radio frequency signal between the radio frequency path of the second band pass filter and the radio frequency path of the second receiver, and improve the accuracy of the radio frequency signal received by the first receiver and the second receiver.
On the basis of the above embodiments, as shown in fig. 5, in the radio frequency receiving circuit provided in the embodiment of the present invention, the first receiver matching circuit 8 includes a fourth capacitor C3, a fifth capacitor C4, a fourth inductor L3, and a fifth inductor L2; a first end of the fourth capacitor C3 is connected to the output end of the first bandpass filter 4, a second end of the fourth capacitor C3 is connected to a first end of the fourth inductor L3, and a second end of the fourth inductor L3 may be used for connecting to the first receiver; a first end of the fifth inductor L2 is connected to a second end of the fourth capacitor C3, a second end of the fifth inductor L2 is connected to a first end of the fifth capacitor C4, and a second end of the fifth capacitor C4 is grounded;
and/or the second receiver matching circuit 9 comprises a sixth capacitor C6, a seventh capacitor C7, a sixth inductor L7 and a seventh inductor L6; a first end of a sixth capacitor C6 is connected with the output end of the second band-pass filter 5, a second end of the sixth capacitor C6 is connected with a first end of a sixth inductor L7, and a second end of the sixth inductor L7 is used for being connected with a second receiver; a first end of the seventh inductor L6 is connected to the second end of the sixth capacitor C6, a second end of the seventh inductor L6 is connected to the first end of the seventh capacitor C7, and a second end of the seventh capacitor C7 is grounded.
Specifically, in the embodiment of the present invention, the first receiver matching circuit 8 may include a fourth capacitor C3, a fifth capacitor C4, a fourth inductor L3, and a fifth inductor L2, where the fourth capacitor C3 may be 12pf_0201, the fifth capacitor C4 may be 22pf_0201, the fourth inductor L3 may be 1.5nH, and the fifth inductor L2 may be 3.3nH.
The second receiver matching circuit 9 includes a sixth capacitor C6, a seventh capacitor C7, a sixth inductor L7, and a seventh inductor L6, the sixth capacitor C6 may be 12pf _0201, the seventh capacitor C7 may be 22pf _0201, the sixth inductor L7 may be 2.0nH, and the seventh inductor L6 may be 3.3nH.
A second end of the fourth inductor L3 and a second end of the sixth inductor L7 are respectively connected to the first radio frequency output terminal 41 and the second radio frequency receiving terminal 51 of the radio frequency receiving circuit, and the first radio frequency output terminal 41 and the second radio frequency receiving terminal 51 are respectively configured to output the radio frequency signals in different frequency bands obtained by filtering to radio frequency paths of the first receiver and the second receiver.
The embodiment of the utility model provides an in, given first receiver matching circuit and second receiver matching circuit's concrete structure, this simple structure can reduce the cost that the radio frequency was received under the condition of the matching degree that improves between first receiver and second receiver and the radio frequency receiving circuit.
On the basis of the above embodiments, as shown in fig. 6, the embodiment of the present invention further provides a radio frequency receiving circuit, including: a first band-pass filter 4 having a first conducted frequency band and a second band-pass filter 5 having a second conducted frequency band, the first and second conducted frequency bands being non-intersecting.
The input end of the first band-pass filter 4 and the input end of the second band-pass filter 5 are respectively used for receiving radio frequency signals;
the output end of the first band-pass filter 4 and the output end of the second band-pass filter 5 are both connected with the radio frequency common end 3, and the radio frequency common end 3 is used for being connected with a receiver.
Specifically, the embodiment of the present invention provides a radio frequency receiving circuit, equally constitute by first band pass filter 4 and second band pass filter 5 at least, this first band pass filter 4 switch on the frequency channel for the first frequency channel that switches on, second band pass filter 5 switch on the frequency channel for the second, this first frequency channel that switches on the frequency channel with the second and does not have the intersection, does not have the coincidence promptly.
Different from fig. 3, in the embodiment of the present invention, the input end of the first band pass filter 4 and the input end of the second band pass filter 5 are respectively connected to the first rf input end 42 and the second rf input end 52 of the rf receiving circuit, and the first rf input end 42 and the second rf input end 52 of the rf receiving circuit are respectively used for inputting the same rf signal. It is understood that between the first rf input 42 of the rf receiving circuit and the input of the first band-pass filter 4, or between the second rf input 52 of the rf receiving circuit and the input of the second band-pass filter 5, there may be connected components for improving circuit performance or protecting the circuit, or none of them, and there is no specific limitation here.
The first band-pass filter 4 may filter the input rf signal to obtain an rf signal in a first conduction band, and the second band-pass filter 5 may filter the input rf signal to obtain an rf signal in a second conduction band. Since the first conducting frequency band and the second conducting frequency band do not intersect with each other, the radio frequency signal in the first conducting frequency band is different from the radio frequency signal in the second conducting frequency band, and there is no intersection. Therefore, two paths of different radio frequency signals can be obtained through the radio frequency receiving circuit, and the application of the radio frequency common end is realized. Furthermore, as can be seen from fig. 6, the rf signal in the first pass band and the rf signal in the second pass band share the rf path of the same receiver.
The embodiment of the utility model provides an in the radio frequency receiving circuit who provides, include: the radio frequency signal receiving device comprises a first band-pass filter with a first conducting frequency band and a second band-pass filter with a second conducting frequency band, wherein the first conducting frequency band and the second conducting frequency band are not intersected, and the input end of the first band-pass filter and the input end of the second band-pass filter are respectively used for receiving radio frequency signals; the output end of the first band-pass filter and the output end of the second band-pass filter are both connected with a radio frequency common end, and the radio frequency common end is used for being connected with a receiver. The radio frequency receiving circuit has the advantages that due to the fact that the first band-pass filter and the second band-pass filter exist, and the first conduction frequency band and the second conduction frequency band do not intersect, simultaneous conduction of two radio frequency paths can be achieved, simultaneous working of the two radio frequency paths is achieved, the radio frequency receiving circuit does not have the radio frequency switch, switching of the radio frequency paths is not needed, power consumption caused by the radio frequency switch and complexity of circuit design can be reduced, and cost can be reduced. Moreover, the adopted first band-pass filter and the second band-pass filter have strong universality and cannot be limited by models.
On the basis of the above embodiment, as shown in fig. 7, the radio frequency receiving circuit provided in the embodiment of the present invention further includes a first LC matching circuit 6 and a second LC matching circuit 7;
the input end of the first LC matching circuit 6 is connected with the output end of the first band-pass filter 4, and the output end of the first LC matching circuit 6 is connected with the radio frequency common end 3;
the input end of the second LC matching circuit 7 is connected with the output end of the second band-pass filter 5, and the output end of the second LC matching circuit 7 is connected with the radio frequency common end 3.
Specifically, in the embodiment of the utility model provides an in, for the isolation between the radio frequency path that improves first band pass filter 4 and second band pass filter 5, can increase first LC matching circuit 6 and second LC matching circuit 7 to reduce the radio frequency signal's between two radio frequency paths degree of interference, reduce two way radio frequency signal's influence each other, improve the radio frequency signal's of output accuracy.
On the basis of the above embodiments, as shown in fig. 8, in the radio frequency receiving circuit provided in the embodiments of the present invention, the first LC matching circuit 6 includes a first capacitor C1, a second capacitor C2, and a first inductor L1; the first end of the first capacitor C1 is connected with the output end of the first band-pass filter 4, the second end of the first capacitor C1 is connected with the first end of the second capacitor C2, and the second end of the second capacitor C2 is connected with the radio frequency common end 3; a first end of the first inductor L1 is connected with a second end of the first capacitor C1, and a second end of the first inductor L1 is grounded;
and/or the second LC matching circuit 7 comprises a second inductor L4, a third inductor L5 and a third capacitor C5; the first end of the second inductor L4 is connected with the output end of the second band-pass filter 5, the second end of the second inductor L4 is connected with the first end of the third inductor L5, and the second end of the third inductor L5 is connected with the radio frequency common end 3; a first end of the third capacitor C5 is connected to the second end of the second inductor L4, and a second end of the third capacitor C5 is grounded.
Specifically, in the embodiment of the present invention, the first LC matching circuit 6 includes a first capacitor C1, a second capacitor C2 and a first inductor L1, the first capacitor C1 may be 2.2pf_0201, the second capacitor C2 may be 8.2pf_0201, and the first inductor L1 may be set as required.
The second LC matching circuit 7 may also include a second inductor L4, a third inductor L5, and a third capacitor C5, where the second inductor L4 may be 1.5nH, the third inductor L5 may be 1.0nH, and the third capacitor C5 may be set as needed.
As shown in fig. 8, the input end of the first bandpass filter 4 is further connected to an eighth inductor L12 connected to ground, the output end of the first bandpass filter 4 is further connected to a ninth inductor L13 connected to ground, the input end of the second bandpass filter 5 is further connected to a tenth inductor L8 connected to ground, and the output end of the second bandpass filter 5 is further connected to an eleventh inductor L9 connected to ground.
On the basis of the above embodiment, as shown in fig. 8, the radio frequency receiving circuit provided in the embodiment of the present invention further includes a receiver matching circuit 10;
the input end of the receiver matching circuit 10 is connected with the output end of the first LC matching circuit 6 and the output end of the second LC matching circuit 7 respectively, and the output end of the receiver matching circuit 10 is connected with the radio frequency common end 3.
Specifically, in the embodiment of the present invention, for improving the matching degree between the radio frequency path of the first band pass filter and the radio frequency path of the second band pass filter and the corresponding receiver, the receiver matching circuit 10 shared by two radio frequency paths can be added, so as to reduce the matching error of the radio frequency signal between the radio frequency path of the first band pass filter and the radio frequency path of the receiver and the matching error of the radio frequency signal between the radio frequency path of the second band pass filter and the radio frequency path of the receiver, and improve the accuracy of the radio frequency signal received by the receiver.
On the basis of the foregoing embodiment, as shown in fig. 8, the radio frequency receiving circuit provided in the embodiment of the present invention further includes an eighth capacitor C11 and/or a ninth capacitor C8;
the first end of the eighth capacitor C11 and the first end of the ninth capacitor C8 are both used for receiving radio frequency signals;
a second end of the eighth capacitor C11 is connected to the input of the first band-pass filter 4, and a second end of the ninth capacitor C8 is connected to the input of the second band-pass filter 5.
Specifically, in the embodiment of the present invention, the first end of the eighth capacitor C11 may be connected to the second rf input end 52 of the rf receiving circuit, and the first end of the ninth capacitor C8 may be connected to the first rf input end 42 of the rf receiving circuit. The first rf input 42 of the rf receiving circuit and the second rf input 52 of the rf receiving circuit are used for receiving the same rf signal.
On the basis of the above embodiment, as shown in fig. 8, in the radio frequency receiving circuit provided in the embodiment of the present invention, the output end of the second LC matching circuit 7 is further connected to a tenth capacitor C10.
On the basis of the foregoing embodiment, as shown in fig. 8, in the radio frequency receiving circuit provided in the embodiment of the present invention, the receiver matching circuit 10 includes an eleventh capacitor C14, a twelfth inductor L16, and a thirteenth inductor L15; a first end of the twelfth inductor L16 is connected to the output end of the first LC matching circuit 6 and the other end of the tenth capacitor C10, respectively; a second terminal of the twelfth inductor L16 is connected to the radio frequency common terminal 3. A first end of the thirteenth inductor L15 is connected to a first end of the twelfth inductor L16, a second end of the thirteenth inductor L15 is connected to a first end of the eleventh capacitor C14, and a second end of the eleventh capacitor C14 is grounded.
On the basis of the above embodiment, as shown in fig. 9, the embodiment of the present invention further provides a terminal device, which includes a receiver 91 and a radio frequency receiving circuit 92, where the receiver 91 is connected to the radio frequency receiving circuit 92.
Specifically, the terminal device provided in the embodiment of the present invention includes the connected receivers 91 and rf receiving circuits 92, the number of the receivers 91 is the same as the number of the rf output terminals of the rf receiving circuits 92, and may be one or two, which is not specifically limited herein. Because the terminal equipment comprises the radio frequency receiving circuit, one radio frequency common end can be shared as a radio frequency input end or a radio frequency output end, so that the number of radio frequency ports is reduced.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment may be implemented by software plus a necessary general hardware platform, and may also be implemented by hardware. Based on the understanding, the above technical solutions substantially or otherwise contributing to the prior art may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the various embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. A radio frequency receiving circuit, comprising: the band-pass filter comprises a first band-pass filter with a first conducting frequency band and a second band-pass filter with a second conducting frequency band, and the first conducting frequency band and the second conducting frequency band are not intersected;
the input end of the first band-pass filter and the input end of the second band-pass filter are both connected with a radio frequency common end, and the radio frequency common end is used for being connected with a receiving antenna;
and the output end of the first band-pass filter and the output end of the second band-pass filter are both used for being connected with a receiver.
2. The radio frequency receiving circuit according to claim 1, further comprising a first LC matching circuit and a second LC matching circuit;
the input end of the first LC matching circuit is connected with the radio frequency common end, and the output end of the first LC matching circuit is connected with the input end of the first band-pass filter;
the input end of the second LC matching circuit is connected with the radio frequency common end, and the output end of the second LC matching circuit is connected with the input end of the second band-pass filter.
3. The radio frequency receiving circuit of claim 2, wherein the first LC matching circuit comprises a first capacitor, a second capacitor, and a first inductor; a first end of the first capacitor is connected with the radio frequency common end, a second end of the first capacitor is connected with a first end of the second capacitor, and a second end of the second capacitor is connected with an input end of the first band-pass filter; the first end of the first inductor is connected with the second end of the first capacitor, and the second end of the first inductor is grounded;
and/or the second LC matching circuit comprises a second inductor, a third inductor and a third capacitor; a first end of the second inductor is connected with the radio frequency common end, a second end of the second inductor is connected with a first end of the third inductor, and a second end of the third inductor is connected with an input end of the second band-pass filter; and the first end of the third capacitor is connected with the second end of the second inductor, and the second end of the third capacitor is grounded.
4. The radio frequency receiving circuit of claim 1, further comprising a first receiver matching circuit and a second receiver matching circuit;
the input end of the first receiver matching circuit is connected with the output end of the first band-pass filter, and the output end of the first receiver matching circuit is used for being connected with a first receiver;
the input end of the second receiver matching circuit is connected with the output end of the second band-pass filter, and the output end of the second receiver matching circuit is used for being connected with a second receiver.
5. The radio frequency receiving circuit of claim 4, wherein the first receiver matching circuit comprises a fourth capacitor, a fifth capacitor, a fourth inductor, and a fifth inductor; a first end of the fourth capacitor is connected with an output end of the first band-pass filter, a second end of the fourth capacitor is connected with a first end of the fourth inductor, and a second end of the fourth inductor is used for being connected with the first receiver; a first end of the fifth inductor is connected with a second end of the fourth capacitor, a second end of the fifth inductor is connected with a first end of the fifth capacitor, and a second end of the fifth capacitor is grounded;
and/or the second receiver matching circuit comprises a sixth capacitor, a seventh capacitor, a sixth inductor and a seventh inductor; a first end of the sixth capacitor is connected with an output end of the second band-pass filter, a second end of the sixth capacitor is connected with a first end of the sixth inductor, and a second end of the sixth inductor is used for being connected with the second receiver; a first end of the seventh inductor is connected to the second end of the sixth capacitor, a second end of the seventh inductor is connected to the first end of the seventh capacitor, and a second end of the seventh capacitor is grounded.
6. A radio frequency receiving circuit, comprising: the band-pass filter comprises a first band-pass filter with a first conduction frequency band and a second band-pass filter with a second conduction frequency band, wherein the first conduction frequency band and the second conduction frequency band are not intersected;
the input end of the first band-pass filter and the input end of the second band-pass filter are respectively used for receiving radio frequency signals;
the output end of the first band-pass filter and the output end of the second band-pass filter are both connected with a radio frequency common end, and the radio frequency common end is used for being connected with a receiver.
7. The radio frequency receiving circuit according to claim 6, further comprising a first LC matching circuit and a second LC matching circuit;
the input end of the first LC matching circuit is connected with the output end of the first band-pass filter, and the output end of the first LC matching circuit is connected with the radio frequency common end;
the input end of the second LC matching circuit is connected with the output end of the second band-pass filter, and the output end of the second LC matching circuit is connected with the radio frequency public end.
8. The radio frequency receiving circuit of claim 7, further comprising a receiver matching circuit;
the input end of the receiver matching circuit is connected with the output end of the first LC matching circuit and the output end of the second LC matching circuit respectively, and the output end of the receiver matching circuit is connected with the radio frequency common end.
9. The radio frequency receiving circuit according to any one of claims 6-8, further comprising an eighth capacitor and/or a ninth capacitor;
a first end of the eighth capacitor and a first end of the ninth capacitor are both used for receiving the radio frequency signal;
and a second end of the eighth capacitor is connected with the input end of the first band-pass filter, and a second end of the ninth capacitor is connected with the input end of the second band-pass filter.
10. A terminal device, characterized in that it comprises a receiver and a radio frequency receiving circuit according to any one of claims 1-9, said receiver being connected to said radio frequency receiving circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222638863.4U CN218499131U (en) | 2022-10-08 | 2022-10-08 | Radio frequency receiving circuit and terminal equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222638863.4U CN218499131U (en) | 2022-10-08 | 2022-10-08 | Radio frequency receiving circuit and terminal equipment |
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| Publication Number | Publication Date |
|---|---|
| CN218499131U true CN218499131U (en) | 2023-02-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222638863.4U Active CN218499131U (en) | 2022-10-08 | 2022-10-08 | Radio frequency receiving circuit and terminal equipment |
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| CN (1) | CN218499131U (en) |
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