WO2024087849A1

WO2024087849A1 - Radio frequency receiving module and radio frequency chip

Info

Publication number: WO2024087849A1
Application number: PCT/CN2023/115037
Authority: WO
Inventors: 胡杨君; 郭嘉帅
Original assignee: 深圳飞骧科技股份有限公司
Priority date: 2022-10-28
Filing date: 2023-08-25
Publication date: 2024-05-02
Also published as: CN218829857U

Abstract

The present utility model provides a radio frequency receiving module and a radio frequency chip. The radio frequency receiving module comprises a signal receiving end, a multi-channel radio frequency switch, a filter, a low-noise amplifier and a signal sending end, which are connected in sequence, and further comprises a tuning inductor and an input matching network, wherein a first end of the tuning inductor is connected between the signal receiving end and the multi-channel radio frequency switch, and a second end of the tuning inductor is grounded; a first end of the input matching network is connected to an output end of the filter, and a second end of the input matching network is connected to an input end of the low-noise amplifier; and an output end of the low-noise amplifier is connected to the signal sending end. The radio frequency receiving module and the radio frequency chip of the present utility model have the advantages of a radio frequency noise coefficient being small, the reliability being high, and there being a good frequency band suppression effect.

Description

RF receiving module and RF chip

Technical Field

The utility model relates to the technical field of wireless communications, and in particular to a radio frequency receiving module and a radio frequency chip.

Background technique

As humans enter the information age, wireless communication technology has developed rapidly. From mobile phones, wireless LANs, Bluetooth, etc., it has become an indispensable part of social life and development. The progress of wireless communication technology is inseparable from the development of RF circuits and microwave technology. At present, in wireless transceiver systems, RF amplifiers are one of the important components.

As a part of modern social civilization, existing communications have brought great convenience to people's lives. The demand for massive data processing has given rise to the advent of the 5G era. In the communication system, the RF front-end receiving module is responsible for the preliminary processing of the signal received from the antenna, including filtering, amplification, etc., and is an indispensable existence in various smart terminals. Its key components include multi-channel RF switches, filters, matching networks, and low-noise amplifiers. With the increasing maturity of communication technology, high-sensitivity, high-reliability and low-cost RF receiving modules are increasingly in demand. Among them, in a receiving system with fixed bandwidth and demodulation signal-to-noise ratio, the noise factor becomes a key indicator affecting sensitivity.

However, the filter process error of the RF front-end receiving module in the prior art is large, the RF noise coefficient is large, and the reliability is low.

Utility Model Content

In view of the above deficiencies in the prior art, the utility model proposes a radio frequency receiving module and a radio frequency chip with a small radio frequency noise coefficient, high reliability, and good frequency band suppression effect to solve the above technical problems.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

In the first aspect, an embodiment of the utility model provides a radio frequency receiving module, comprising a signal receiving end, a multi-channel radio frequency switch, a filter, a low noise amplifier and a signal transmitting end connected in series in sequence, and also comprising a tuning inductor and an input matching network, wherein the first end of the tuning inductor is connected between the signal receiving end and the multi-channel radio frequency switch, the second end of the tuning inductor is grounded, the first end of the input matching network is connected to the output end of the filter, the second end of the input matching network is connected to the input end of the low noise amplifier, and the output end of the low noise amplifier is connected to the signal transmitting end.

Preferably, the input matching network includes a second inductor and a third inductor, the first end of the second inductor and the first end of the third inductor are both connected to the output end of the filter, the second end of the second inductor is grounded, and the second end of the third inductor is connected to the input end of the low noise amplifier.

Preferably, the multi-channel RF switch includes a first series transistor, a second series transistor, a third series transistor and a fourth series transistor, the first end of the first series transistor, the first end of the second series transistor, the first end of the third series transistor and the first end of the fourth series transistor are all connected to the signal receiving end, and the second end of the first series transistor is connected to the input end of the filter.

Preferably, the multi-channel RF switch further includes a first parallel transistor, a second parallel transistor, a third parallel transistor, and a fourth parallel transistor, wherein the first end of the first parallel transistor is connected to the second end of the first series transistor, and the second end of the first parallel transistor is grounded.

Preferably, the low noise amplifier includes a main amplification path for achieving low noise amplification of the signal and a bypass path for attenuating the signal; the first end of the main amplification path is connected to the output end of the input matching network as the input end of the low noise amplifier, and the second end of the main amplification path is connected to the signal sending end as the output end of the low noise amplifier; the first end of the bypass path and the second end of the bypass path are respectively connected to the first end of the main amplification path and the second end of the main amplification path.

Preferably, the filter is a type of a BAW filter, a FBAR filter, an IPD filter and a LTCC filter.

Preferably, the filter is an IPD filter or a LTCC filter.

Preferably, the signal receiving end is an antenna.

In a second aspect, the utility model provides a radio frequency chip, comprising the above-mentioned radio frequency receiving module.

Compared with the related art, in an embodiment of the utility model, a signal receiving end, a multi-channel RF switch, a filter, a low noise amplifier and a signal transmitting end are connected in series in sequence, a first end of the tuning inductor is connected between the signal receiving end and the multi-channel RF switch, a second end of the tuning inductor is grounded, a first end of the input matching network is connected to the output end of the filter, a second end of the input matching network is connected to the input end of the low noise amplifier, and the output end of the low noise amplifier is connected to the signal transmitting end; a tuning inductor arranged between the signal receiving end and the multi-channel RF switch is used to eliminate the capacitance of the RF switch, a signal is input from the signal receiving end to the multi-channel RF switch, the multi-channel RF switch selects a signal path and then enters the filter, the filter selects the frequency band of the input low noise amplifier and suppresses the remaining frequency bands; the filter outputs the required frequency band signal and then enters the input matching network, the low noise amplifier receives the signal from the filter output, performs low noise amplification or attenuation on it, and the low noise amplifier output enters the signal output end, and the existence of the tuning inductor and the second inductor makes the noise coefficient of the RF receiving module low, the reliability is high, and the B41 frequency band can be better suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be described in detail below in conjunction with the accompanying drawings. The above and other aspects of the present invention will become clearer and easier to understand through the detailed description made in conjunction with the following drawings. In the accompanying drawings:

FIG1 is a circuit diagram of a radio frequency receiving module in an embodiment of the present utility model;

FIG2 is a circuit diagram of a multi-channel radio frequency switch in an embodiment of the present utility model;

FIG. 3 is a circuit diagram of an input matching network in an embodiment of the present utility model.

Among them, 100, RF receiving module, 1, signal receiving end, 2, multi-channel RF switch, 21, first series transistor, 22, second series transistor, 23, third series transistor, 24, fourth series transistor, 3, filter, 4, input matching network, 5, low noise amplifier Device, 51, main amplification path, 52, bypass path, 6, signal sending end, 7, first parallel transistor, 8, second parallel transistor, 9, third parallel transistor, 10, fourth parallel transistor.

Detailed ways

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

Embodiment 1

Please refer to Figures 1-3, an embodiment of the present utility model provides a radio frequency receiving module 100, including a signal receiving terminal 1, a multi-channel radio frequency switch 2, a filter 3, a low noise amplifier 5 and a signal transmitting terminal 6 (RX) connected in series, and also includes a tuning inductor L1 and an input matching network 4, wherein a first end of the tuning inductor L1 is connected between the signal receiving terminal 1 and the multi-channel radio frequency switch 2, and a second end of the tuning inductor L1 is grounded GND, and the A first end of the input matching network 4 is connected to the output end of the filter 3 , a second end of the input matching network 4 is connected to the input end of the low noise amplifier 5 , and an output end of the low noise amplifier 5 is connected to the signal sending end 6 .

Among them, the signal receiving end 1 is used to receive electromagnetic signals and transmit the electromagnetic signals to the multi-channel RF switch 2. In order to eliminate the capacitance presented by the RF switch, a tuning inductor L1 connected to the ground is connected in parallel in front of it. The tuning inductor L1 optimizes the matching and reduces the noise of the receiving module.

Specifically, by connecting the signal receiving terminal 1, the multi-channel RF switch 2, the filter 3, the low noise amplifier 5 and the signal sending terminal 6 in sequence, the first end of the tuning inductor L1 is connected between the signal receiving terminal 1 and the multi-channel RF switch 2, the second end of the tuning inductor L1 is grounded, the first end of the input matching network 4 is connected to the output end of the filter 3, the second end of the input matching network 4 is connected to the input end of the low noise amplifier 5, and the output end of the low noise amplifier 5 is connected to the signal sending terminal 6; the tuning inductor L1 set between the signal receiving terminal 1 and the multi-channel RF switch 2 is used to eliminate the capacitance of the RF switch, the signal is input from the signal receiving terminal 1 to the multi-channel RF switch 2, the multi-channel RF switch 2 selects the signal path and then enters the filter 3, the filter 3 selects the frequency band of the input low noise amplifier and suppresses the remaining frequency bands; the filter 3 outputs the required frequency band signal and then enters the input matching network 4, the low noise amplifier receives the signal output from the filter 3, performs low noise amplification or attenuation, and the low noise amplifier output enters the signal output terminal, so that the RF receiving module has a low noise coefficient and high reliability, and can better suppress the B41 frequency band.

Preferably, the tuning inductor L1 is a tuning inductor. The tuning inductor can optimize the matching and reduce the noise of the receiving module.

In this embodiment, the input matching network 4 includes a second inductor L2 and a third inductor L3, the first end of the second inductor L2 and the first end of the third inductor L3 are both connected to the output end of the filter 3, the second end of the second inductor L2 is grounded GND, and the second end of the third inductor L3 is connected to the input end of the low noise amplifier 5.

Specifically, after the signal is filtered by the filter 3, a second inductor L2 connected in parallel to the ground is connected between the third inductor L3 and the filter 3. To a certain extent, the influence of different performances of filters 3 from different batches is eliminated, while the suppression of the B41 frequency band is improved and the input impedance matching of the low noise amplifier is made more flexible.

Optionally, the tuning inductor L1, the second inductor L2, and the third inductor L3 are all off-chip inductors, which are used to reduce the noise coefficient of the radio frequency receiving module.

In this embodiment, the multi-channel RF switch 2 includes a first series transistor 21, a second series transistor 22, a third series transistor 23 and a fourth series transistor 24, the first end of the first series transistor 21, the first end of the second series transistor 22, the first end of the third series transistor 23 and the first end of the fourth series transistor 24 are connected to the signal receiving end 1, and the second end of the first series transistor 21 is connected to the input end of the filter 3.

Optionally, the second end of the second series transistor 22 , the second end of the third series transistor 23 , and the second end of the fourth series transistor 24 are connected to input ends of other radio frequency paths.

Specifically, by setting the first series transistor 21, the second series transistor 22, the third series transistor 23 and the fourth series transistor 24 to increase multi-channel radio frequency, the filter 3 can select a suitable radio frequency signal for filtering processing. The filtered signal after speaker processing can be adapted to different devices and has a wide range of adaptability.

Preferably, the isolation between the multiple ports is increased by connecting the first series transistor 21, the second series transistor 22, the third series transistor 23 and the fourth series transistor 24 in parallel to a shunt transistor connected to the ground.

Preferably, the multi-channel RF switch 2 includes not only 4 channels, but also 2 channels, 3 channels, 5 channels, etc. The specific selection can be made according to the actual situation, and will not be described one by one here.

In this implementation, only a 1P4T RF switch is used for illustration. It can be 1P5T, 2P4T, 2P5T, etc., and the filter can be connected to one of the ports. TRX1/2/3 connection can be the filter input, antenna LNA input, or direct input signal. The specific connection is selected according to the actual application and will not be described here one by one.

In this embodiment, the multi-channel RF switch 2 further includes a first parallel transistor 7, The second parallel transistor 8, the third parallel transistor 9, and the fourth parallel transistor 10, the first end of the first parallel transistor 7 is connected to the second end of the first series transistor 21, and the second end of the first parallel transistor 7 is grounded. Optionally, the first parallel transistor 7, the second parallel transistor 8, the third parallel transistor 9, and the fourth parallel transistor 10 have the same principles and are not described one by one here.

In this embodiment, the low noise amplifier 5 includes a main amplification path 51 for achieving low noise amplification of the signal and a bypass path 52 for attenuating the signal. The first end of the main amplification path 51 is connected to the output end of the input matching network 4 as the input end of the low noise amplifier 5, and the second end of the main amplification path 51 is connected to the signal sending end 6 as the output end of the low noise amplifier 5; the first end of the bypass path 52 and the second end of the bypass path 52 are respectively connected to the first end of the main amplification path 51 and the second end of the main amplification path 51.

Specifically, the main amplifying path 51 is used to amplify the signal output by the input matching network 4 , and outputs the signal to the signal transmitting end 6 through the output end of the main amplifying path 51 , and the signal is transmitted through the signal transmitting end 6 .

By connecting the first end and the second end of the bypass path 52 to the first end and the second end of the main amplification path 51, respectively, the bypass path 52 can be used to attenuate a relatively large input signal. In this way, the low noise amplifier can be used to achieve low noise amplification of the signal, and different gain gears are usually set to cope with input signals of different powers. For relatively large input signals, they can be attenuated through the bypass path 52 and then output, which is highly safe.

Preferably, the design of the low noise amplifier includes a bypass attenuation design, and is integrated with the multi-channel RF switch 2 on a silicon chip (SOI Die). If the RF receiving module also includes a TX transmitting part, the controller and the coupler can also be integrated at the same time to reduce costs and save area.

In this embodiment, the filter 3 is a type of a BAW filter, a FBAR filter, an IPD filter, and a LTCC filter.

Specifically, the 5G commonly used frequency bands n77 (3.3-4.2G) and n79 (4.4-5G) have a wide interval between frequency bands, so filter 3 does not rely heavily on a steep roll-off curve. BAW/FABAR filters have steep edges, large out-of-band attenuation, low insertion loss, and Low temperature coefficient and excellent performance.

Preferably, the filter is an IPD filter or a LTCC filter. Since BAW/FBAR filters are subject to process constraints and are expensive, commonly used IPD/LTCC filters are preferred.

In this embodiment, the signal receiving end 1 is an antenna (ANT) for receiving electromagnetic signals and transmitting the electromagnetic signals to the multi-channel RF switch 2, which selects channels and then filters the signals through the filter 3.

Embodiment 2

The utility model provides a radio frequency chip, including the radio frequency receiving module 100 of the above-mentioned embodiment 1. The radio frequency chip has a low noise coefficient, high reliability, and can better suppress the B41 frequency band.

It should be noted that the various embodiments described above with reference to the accompanying drawings are only used to illustrate the present invention rather than to limit the scope of the present invention. Those skilled in the art should understand that any modification or equivalent replacement of the present invention without departing from the spirit and scope of the present invention should be included in the scope of the present invention. In addition, unless otherwise indicated by the context, words appearing in the singular include the plural form, and vice versa. In addition, unless otherwise specified, all or part of any embodiment may be used in combination with all or part of any other embodiment.

Claims

A radio frequency receiving module comprises a signal receiving end, a multi-channel radio frequency switch, a filter, a low noise amplifier and a signal transmitting end connected in series in sequence, characterized in that it also comprises a tuning inductor and an input matching network, wherein the first end of the tuning inductor is connected between the signal receiving end and the multi-channel radio frequency switch, the second end of the tuning inductor is grounded, the first end of the input matching network is connected to the output end of the filter, the second end of the input matching network is connected to the input end of the low noise amplifier, and the output end of the low noise amplifier is connected to the signal transmitting end.
The RF receiving module according to claim 1 is characterized in that the input matching network includes a second inductor and a third inductor, the first end of the second inductor and the first end of the third inductor are both connected to the output end of the filter, the second end of the second inductor is grounded, and the second end of the third inductor is connected to the input end of the low noise amplifier.
The RF receiving module according to claim 2 is characterized in that the multi-channel RF switch includes a first series transistor, a second series transistor, a third series transistor and a fourth series transistor, the first end of the first series transistor, the first end of the second series transistor, the first end of the third series transistor and the first end of the fourth series transistor are all connected to the signal receiving end, and the second end of the first series transistor is connected to the input end of the filter.
The RF receiving module according to claim 3 is characterized in that the multi-channel RF switch also includes a first parallel transistor, a second parallel transistor, a third parallel transistor, and a fourth parallel transistor, the first end of the first parallel transistor is connected to the second end of the first series transistor, and the second end of the first parallel transistor is grounded.
The RF receiving module according to claim 1 is characterized in that the low noise amplifier comprises a main amplification path for achieving low noise amplification of the signal and a bypass path for attenuating the signal; the first end of the main amplification path is connected to the output end of the input matching network as the input end of the low noise amplifier, and the second end of the main amplification path is connected to the signal transmitting end as the output end of the low noise amplifier; the first end of the bypass path and the second end of the bypass path are respectively connected to the output end of the main amplification path. a first end and a second end of the main amplification path.
The RF receiving module according to claim 1 is characterized in that the filter model is one of a BAW filter, a FBAR filter, an IPD filter and a LTCC filter.
The RF receiving module according to claim 6 is characterized in that the filter is an IPD filter or a LTCC filter.
The radio frequency receiving module according to claim 1 is characterized in that the signal receiving end is an antenna.
A radio frequency chip, characterized by comprising the radio frequency receiving module as described in any one of claims 1-8.