WO2019168221A1

WO2019168221A1 - Communication device, mobile terminal comprising same, and vehicle

Info

Publication number: WO2019168221A1
Application number: PCT/KR2018/002497
Authority: WO
Inventors: 박병선; 문탁스
Original assignee: 엘지전자 주식회사
Priority date: 2018-02-28
Filing date: 2018-02-28
Publication date: 2019-09-06

Abstract

The present invention relates to a communication device, a mobile terminal comprising same, and a vehicle. The communication device according to one embodiment of the present invention comprises: an antenna; a low-noise amplifier for amplifying an RF signal received through the antenna; a power amplifier for amplifying a signal to be outputted through the antenna; and a transformer which insulates the low-noise amplifier from the power amplifier and which is connected to the antenna, the low-noise amplifier, and the power amplifier. Therefore, the performance deterioration of the low-noise amplifier and the power amplifier in a time division duplexing (TDD) scheme can be reduced.

Description

Communication device, mobile terminal having same, and vehicle

The present invention relates to a communication device, a mobile terminal having the same, and a vehicle, and more particularly, to a communication device capable of reducing performance degradation of a low noise amplifier and a power amplifier in a time division duplexing (TDD) scheme, and a mobile device having the same. A terminal, and a vehicle.

The communication device is a device that receives and transmits a radio signal.

Meanwhile, according to a recent communication method, it is difficult to design an antenna or an amplifier having high gain due to a millimeter wave design characteristic.

On the other hand, as the target frequency increases, there is a problem that a path loss in free space is basically increased.

In order to overcome such path loss and design limitations, there is a method of performing beam forming based on a phased array.

However, according to the phased array structure, as the number of the plurality of amplifiers increases, the number of antennas increases, and accordingly, the number of pins of the connected chips must increase, thereby integrating the chips. Problem occurs.

An object of the present invention is to provide a communication device capable of reducing performance degradation of a low noise amplifier and a power amplifier in a time division duplexing (TDD) scheme, a mobile terminal having the same, and a vehicle.

According to an aspect of the present invention, there is provided a communication apparatus and a mobile terminal including the same, an antenna, a low noise amplifier for amplifying an RF signal received from an antenna, and a power for amplifying a signal output through the antenna. And an amplifier, a low noise amplifier, and a power amplifier, which isolate an amplifier, a low noise amplifier, and a transformer connected to the power amplifier.

On the other hand, a communication device and a mobile terminal having the same according to another embodiment of the present invention for achieving the above object, an antenna, a low noise amplifier for amplifying the RF signal received from the antenna, and amplifies the signal output through the antenna A power amplifier, an antenna, a low noise amplifier, a transformer connected to the power amplifier, and a switch connected between the transformer and the low noise amplifier.

A communication device and a mobile terminal having the same according to an embodiment of the present invention, an antenna, a low noise amplifier for amplifying the RF signal received from the antenna, a power amplifier for amplifying the signal output through the antenna, a low noise amplifier and By insulating the power amplifier and including an antenna, a low noise amplifier, and a transformer connected to the power amplifier, it is possible to reduce performance degradation of the low noise amplifier and the power amplifier in a time division duplexing (TDD) scheme.

In particular, the input of the low noise amplifier and the output of the power amplifier can be connected, thereby reducing the number of pins of the chip including the low noise amplifier and the power amplifier, thereby enabling chip integration. .

Therefore, according to the phased array structure, since a plurality of amplifiers can be implemented in one chip, beamforming over a wide frequency band is possible.

On the other hand, by using a first transformer having an antenna connected to the input side and a low noise amplifier connected to the output side, and a second transformer having a power amplifier connected to the output side, performance of the low noise amplifier and the power amplifier can be ensured in the TDD scheme. .

On the other hand, it may further include a switch connected between the transformer and the low noise amplifier, thereby separating the transmission and reception, it is possible to ensure the performance of the low noise amplifier and power amplifier.

On the other hand, it may further include a second switch connected between the other end of the other of the input side and the output side of the transformer, thereby separating the transmission and reception, it is possible to ensure the performance of the low noise amplifier and power amplifier .

On the other hand, it may further include an inductor disposed between the antenna and the input side of the transformer, and between the ground terminal, thereby ensuring the performance of the low noise amplifier and power amplifier in the TDD scheme.

On the other hand, it may further include an inductor disposed between the transformer and the low power amplifier, and between the ground terminal, thereby, it is possible to ensure the performance of the low noise amplifier and power amplifier in the TDD scheme.

On the other hand, it may further include a matching network connected between the transformer and the low noise amplifier, it is possible to ensure the performance of the low noise amplifier and power amplifier in the TDD scheme.

On the other hand, it may further include a matching network connected between the antenna and the transformer, it is possible to ensure the performance of the low noise amplifier and power amplifier in the TDD scheme.

On the other hand, it may further include a capacitor connected to both ends of the input side of the transformer, it is possible to ensure the performance of the low noise amplifier and power amplifier in the TDD scheme.

According to another embodiment of the present invention, a communication device and a mobile terminal including the same include an antenna, a low noise amplifier for amplifying an RF signal received from the antenna, a power amplifier for amplifying a signal output through the antenna, an antenna, and a low noise. By including an amplifier, a transformer connected to the power amplifier, and a switch connected between the transformer and the low noise amplifier, the transmission and reception can be separated in the time division duplexing (TDD) scheme to ensure the performance of the low noise amplifier and the power amplifier. Will be.

1A is a front perspective view of a mobile terminal according to an embodiment of the present invention.

FIG. 1B is a rear perspective view of the mobile terminal shown in FIG. 1A.

2 is a block diagram of the mobile terminal of FIG. 1.

3A to 4C illustrate various examples of a communication device related to the present invention.

5 is a diagram illustrating a communication device according to an embodiment of the present invention.

6A to 15B are diagrams illustrating a communication device according to various embodiments of the present disclosure.

16A illustrates a vehicle according to an embodiment of the present invention.

16B is a block diagram of the vehicle of FIG. 16A.

Hereinafter, with reference to the drawings will be described the present invention in more detail.

The suffixes "module" and "unit" for components used in the following description are merely given in consideration of ease of preparation of the present specification, and do not impart any particular meaning or role by themselves. Therefore, the "module" and "unit" may be used interchangeably.

1A is a front perspective view of a mobile terminal according to an embodiment of the present invention, and FIG. 1B is a rear perspective view of the mobile terminal shown in FIG. 1A.

Referring to FIG. 1A, the case forming the exterior of the mobile terminal 100 is formed by the front case 100-1 and the rear case 100-2. Various electronic components may be built in the space formed by the front case 100-1 and the rear case 100-2.

In detail, the front case 100-1 may include a display 151, a first sound output module 153a, a first camera 195a, and first to third

user input units

130a, 130b, and 130c. have. The fourth user input unit 130d, the fifth user input unit 130e, and the first to third microphones 123a, 123b, and 123c may be disposed on the side surface of the rear case 100-2.

As the display 151 overlaps the touch pad in a layer structure, the display 151 may operate as a touch screen.

The first sound output module 153a may be implemented in the form of a receiver or a speaker. The first camera 195a may be implemented in a form suitable for capturing an image or a video of a user or the like. The microphone 123 may be implemented in a form suitable for receiving a user's voice or other sound.

The first to fifth

user input units

130a, 130b, 130c, 130d, and 130e and the sixth and seventh

user input units

130f and 130g to be described below may be collectively referred to as the user input unit 130.

The first to second microphones 123a and 123b are disposed above the rear case 100-2, that is, above the mobile terminal 100 to collect audio signals, and the third microphone 123c may include The rear case 100-2, that is, the lower side of the mobile terminal 100, may be arranged to collect audio signals.

Referring to FIG. 1B, a second camera 195b and a fourth microphone 123d may be additionally mounted on the rear of the rear case 100-2, and a sixth side of the rear case 100-2 may be mounted. And the seventh

user input units

130f and 130g and the interface unit 170 may be disposed.

The second camera 195b may have a photographing direction substantially opposite to that of the first camera 195a, and may have different pixels from the first camera 195a. A flash (not shown) and a mirror (not shown) may be further disposed adjacent to the second camera 195b. In addition, another camera may be further provided adjacent to the second camera 195b to be used for capturing 3D stereoscopic images.

A second sound output module (not shown) may be further disposed on the rear case 100-2. The second sound output module may implement a stereo function together with the first sound output module 153a and may be used for a call in the speakerphone mode.

The power supply unit 190 for supplying power to the mobile terminal 100 may be mounted on the rear case 100-2 side. The power supply unit 190 is, for example, a rechargeable battery, and may be detachably coupled to the rear case 100-2 for charging.

The fourth microphone 123d may be disposed at the front of the rear case 100-2, that is, at the rear of the mobile terminal 100 to collect audio signals.

2 is a block diagram of the mobile terminal of FIG. 1.

Referring to FIG. 2, the mobile terminal 100 includes a wireless communication unit 110, an A / V input unit 120, a user input unit 130, a sensing unit 140, an output unit 150, and a memory. 160, an interface unit 170, a processor 180, and a power supply unit 190 may be included. Such components may be configured by combining two or more components into one component, or by dividing one or more components into two or more components as necessary when implemented in an actual application.

The wireless communication unit 110 may include a broadcast receiving module 111, a mobile communication module 113, a wireless internet module 115, a short range communication module 117, and a GPS module 119.

The broadcast receiving module 111 may receive at least one of a broadcast signal and broadcast related information from an external broadcast management server through a broadcast channel. The broadcast signal and / or broadcast related information received through the broadcast receiving module 111 may be stored in the memory 160.

The mobile communication module 113 may transmit / receive a radio signal with at least one of a base station, an external terminal, and a server on a mobile communication network. Here, the wireless signal may include various types of data according to voice call signal, video call signal, or text / multimedia message transmission and reception.

The wireless internet module 115 refers to a module for wireless internet access. The wireless internet module 115 may be embedded or external to the mobile terminal 100.

The short range communication module 117 refers to a module for short range communication. As a short range communication technology, Bluetooth, Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wideband (UWB), ZigBee, Near Field Communication (NFC), and the like may be used.

The GPS (Global Position System) module 119 receives position information from a plurality of GPS satellites.

The A / V input unit 120 is for inputting an audio signal or a video signal, and may include a camera 195 and a microphone 123.

The camera 195 may process an image frame such as a still image or a video obtained by the image sensor in a video call mode or a photographing mode. The processed image frame may be displayed on the display 151.

The image frame processed by the camera 195 may be stored in the memory 160 or transmitted to the outside through the wireless communication unit 110. Two or more cameras 195 may be provided depending on the configuration aspect of the terminal.

The microphone 123 may receive an external audio signal by a microphone in a display off mode, for example, a call mode, a recording mode, or a voice recognition mode, and process the external audio signal as electrical voice data.

On the other hand, the microphone 123 may be arranged as a plurality in different positions. The audio signal received by each microphone may be processed by the processor 180 or the like.

The user input unit 130 generates key input data input by the user for controlling the operation of the terminal. The user input unit 130 may be configured of a key pad, a dome switch, a touch pad (constant voltage / capacitance), etc. that may receive a command or information by a user's pressing or touch manipulation. In particular, when the touch pad forms a mutual layer structure with the display 151 to be described later, this may be referred to as a touch screen.

The sensing unit 140 detects a current state of the mobile terminal 100 such as an open / closed state of the mobile terminal 100, a location of the mobile terminal 100, presence or absence of user contact, and the like to control the operation of the mobile terminal 100. The sensing signal may be generated.

The sensing unit 140 may include a proximity sensor 141, a pressure sensor 143, a motion sensor 145, a touch sensor 146, and the like.

The proximity sensor 141 may detect the presence or absence of an object approaching the mobile terminal 100 or an object present in the vicinity of the mobile terminal 100 without mechanical contact. In particular, the proximity sensor 141 may detect a proximity object by using a change in an alternating magnetic field or a change in a static magnetic field, or using a rate of change in capacitance.

The pressure sensor 143 may detect whether pressure is applied to the mobile terminal 100 and the magnitude of the pressure.

The motion sensor 145 may detect the position or movement of the mobile terminal 100 using an acceleration sensor, a gyro sensor, or the like.

The touch sensor 146 may detect a touch input by a user's finger or a touch input by a specific pen. For example, when the touch screen panel is disposed on the display 151, the touch screen panel may include a touch sensor 146 for sensing location information, intensity information, and the like of the touch input. The sensing signal detected by the touch sensor 146 may be transmitted to the controller 180.

The output unit 150 is for outputting an audio signal, a video signal, or an alarm signal. The output unit 150 may include a display 151, an audio output module 153, an alarm unit 155, and a haptic module 157.

The display 151 displays and outputs information processed by the mobile terminal 100. For example, when the mobile terminal 100 is in a call mode, the mobile terminal 100 displays a user interface (UI) or a graphic user interface (GUI) related to the call. When the mobile terminal 100 is in a video call mode or a photographing mode, the mobile terminal 100 may display captured or received images respectively or simultaneously, and display a UI and a GUI.

Meanwhile, as described above, when the display 151 and the touch pad form a mutual layer structure and constitute a touch screen, the display 151 may also be used as an input device capable of inputting information by a user's touch in addition to the output device. Can be.

The sound output module 153 may output audio data received from the wireless communication unit 110 or stored in the memory 160 in a call signal reception, a call mode or a recording mode, a voice recognition mode, a broadcast reception mode, and the like. In addition, the sound output module 153 outputs an audio signal related to a function performed in the mobile terminal 100, for example, a call signal reception sound and a message reception sound. The sound output module 153 may include a speaker, a buzzer, and the like.

The alarm unit 155 outputs a signal for notifying occurrence of an event of the mobile terminal 100. The alarm unit 155 outputs a signal for notifying occurrence of an event in a form other than an audio signal or a video signal. For example, the signal may be output in the form of vibration.

The haptic module 157 generates various haptic effects that a user can feel. A representative example of the haptic effect generated by the haptic module 157 is a vibration effect. When the haptic module 157 generates vibration by the tactile effect, the intensity and pattern of the vibration generated by the haptic module 157 may be converted, and may be output by combining different vibrations or sequentially.

The memory 160 may store a program for processing and controlling the processor 180, and provides a function for temporarily storing input or output data (for example, a phone book, a message, a still image, a video, etc.). It can also be done.

The interface unit 170 serves as an interface with all external devices connected to the mobile terminal 100. The interface unit 170 may receive data from an external device or receive power and transmit the data to each component in the mobile terminal 100, and may transmit data in the mobile terminal 100 to an external device.

The processor 180 typically controls the operation of each unit to control the overall operation of the mobile terminal 100. For example, related control and processing for voice calls, data communications, video calls, and the like can be performed. In addition, the processor 180 may include a multimedia playback module 181 for multimedia playback. The multimedia playback module 181 may be configured in hardware within the processor 180 or may be configured in software separately from the processor 180. The processor 180 may include an application processor (not shown) for driving an application. Alternatively, the application processor (not shown) may be provided separately from the processor 180.

In addition, the power supply unit 190 may receive the external power and the internal power under the control of the processor 180 to supply power required for the operation of each component.

Meanwhile, the wireless communication unit 110 of FIG. 2 may receive an RF signal through the antenna 105 and transmit the RF signal to the outside through the antenna 105.

For the operation of the wireless communication unit 110, it is preferable to be designed to be beam-forming based on the phased array.

3A is a diagram illustrating an example of the communication device 300a.

Referring to the drawings, the communication device 300a corresponds to a receiver, and includes a plurality of antennas AN1a to ANna, a plurality of low noise amplifiers LNAs LA1 to LAn, and a plurality of phase shifters. shifter (PA1a to PSna), combiner (XNc), IQ mixer (Mxa), variable gain amplifier (VGA), filter (fliter), local oscillator (LO geberator) (LGa), etc. It may be provided.

The RF signal received by the communication device 300a may be converted into a baseband signal and input to a baseband processor (not shown) for baseband signal processing.

Meanwhile, the communication device 300a of FIG. 3A may be implemented as a MMTC (Multicultural Media, Telecom, and Internet Council) chip.

In addition, when the target frequency of the design is a millimeter wave in the tens of GHz band, the path loss may be approximately 20 dB in free space, rather than in the case of several Ghz bands.

In order to overcome such path loss and design limitations, it is designed to perform beam forming based on a phased array, such as the communication device 300a of FIG. 3A. desirable.

On the other hand, according to a phased array method such as the communication device 300a of FIG. 3A, according to the number N of antenna arrays, in the case of a receiver, the signal-to-noise ratio (SNR) is approximately 10 log (N). You can get more effects by). In addition, in the case of a transmitter, the power is increased by 20log (N).

3B is a diagram illustrating another example of the communication device 300b.

Referring to the drawings, the communication device 300b corresponds to a transmitter, and includes a plurality of antennas AN1a to ANna, a plurality of power amplifiers PAs PA1 to PAn, and a plurality of phase shifters. (phase shifter) (PA1a to PSna), distributor (XNd), IQ mixer (Mxa), variable gain amplifier (VGA), filter (fliter), local oscillator (LO geberator) (LGa), etc. It may be provided.

4A is a diagram illustrating another example of the communication device 400a.

Referring to the drawings, the communication device 400a corresponds to a transmitter, and includes a plurality of antennas AN1a to ANna, a plurality of amplifiers PA / LNA PLA1 to PLAn, and a plurality of phase shifters. shifter (PA1a to PSna), combiner (XN), IQ mixer (Mxa), variable gain amplifier (VGA), filter (fliter), local oscillator (LO geberator) (LGa), etc. It may be provided.

The communication device 400a of FIG. 4A is a method of sharing the communication device 300a of FIG. 3A, in particular the receiver, and the communication device 300b of FIG. 3B, especially the transmitter, and includes a plurality of amplifiers (PA / LNA) PLA1. PLAn) is characterized by operating as a low power amplifier for reception or as a power amplifier for transmission. That is, a bidirectional structure sharing a receiver and a transmitter is illustrated.

Such a communication device 400a of FIG. 4A is possible in a TDD manner rather than an FDD. In particular, the communication apparatus 400a may not be operated at the same time.

On the other hand, as in the communication apparatus 400a of FIG. 4A, the plurality of phase shifters PA1a to PSna and the combiner XN are designed in a passive form, and thus a considerable amount of loss ( loss occurs.

Thus, to compensate for losses, a plurality of variable gain amplifiers (VGAs) are arranged for transmission and reception.

In the communication device 400a of FIG. 4A, according to the phase array structure, as the number of the plurality of amplifiers increases, the number of antennas increases, and accordingly, the number of pins of the chip to be connected must increase. A problem arises in that integration of chips becomes difficult. Accordingly, various attempts have been made to connect the input of the low noise amplifier and the output of the power amplifier.

4B is a diagram illustrating an example of a connection between a low power amplifier and a power amplifier inside the communication device 400b.

Referring to the drawings, the switches SWa and SWb are connected to the low power amplifier LA and the power amplifier PA, respectively.

This structure can be called a single pole double throw (SPDT) structure.

That is, as the structure using the switches SWa and SWb for each of the paths of the transmitter and the receiver is simple to implement, the switching loss and the noise of the receiver path rise due to the use of two switches SWa and SWb. There is. In addition, there is a problem that it is difficult to make the linearity of the switch (SWb) used for the transmitter path good.

4C is a diagram illustrating an example of a bidirectional amplifier.

For the implementation of the amplifier PLA of FIG. 4A, as shown in FIG. 4C, a bidirectional VGA may be used.

In the drawing, the first push pull switching unit 420a is disposed in the port 1 direction, and the second push pull switching unit 420b is disposed in the port 2 direction.

According to this method, performance degradation during reception and transmission can be prevented, but parasitic capacitance and low gain of the switch turned off can be a problem.

In addition, although not shown in the drawings, bidirectional matching may be used to connect the input of the low noise amplifier and the output of the power amplifier. state, which affects each other's circuitry, and therefore has the disadvantage of not being able to optimize performance. In addition, due to the nature of bidirectional matching, a narrow band may limit the bandwidth.

In addition, although not shown in the drawing, a hybrid coupler may be used to connect an input of a low noise amplifier and an output of a power amplifier, but the hybrid coupler is formed through a λ / 4 transmission line. As such, the size varies with frequency. As a result, a size problem occurs, and thus the loss may increase.

Meanwhile, in the present invention, for each of the plurality of amplifiers PA / LNA (PLA1 to PLAn) of FIG. 4A, the input of the low noise amplifier and the output of the power amplifier are connected to each other through one port. In addition, this one port is connected to the antenna and proposes a method for reducing performance degradation of the low noise amplifier and the power amplifier. This will be described with reference to FIG. 5 or below.

Referring to the drawings, the communication device 500 according to the embodiment of the present invention, through the antenna (AN), a low noise amplifier (LA) for amplifying the RF signal received from the antenna (AN), through the antenna (AN) A power amplifier PA that amplifies the output signal, a low noise amplifier LA, and a power amplifier PA are insulated, and a transformer connected to the antenna AN, the low noise amplifier LA, and the power amplifier PA. It is preferred to include 510.

Specifically, the antenna AN and the low noise amplifier LA may be connected to the input side 511 of the transformer 510, and the power amplifier PA may be connected to the output side 512 of the transformer 510. .

In the figure, the antenna AN is connected to the a node of the input side 511 of the transformer 510, the low noise amplifier LA is connected to the b node of the input side 511 of the transformer 510, and the transformer ( It illustrates that the power amplifier PA is connected to the node c of the output side 512 of the 510.

On the other hand, although not shown, the driving voltage source VDD may be connected to the d node of the output side 512 of the transformer 510.

According to the structure of FIG. 5, an input of the low noise amplifier LA and an output of the power amplifier PA may be connected, and accordingly, a chip including the low noise amplifier LA and the power amplifier PA may be connected. The pin count can be reduced, allowing for chip integration.

On the other hand, according to the structure of Figure 5, when receiving the RF signal, since there is no switch on the signal path (signal path), the loss due to the switch does not occur.

In addition, input matching of the low noise amplifier LA may be performed by using the inductor of the transformer 510.

On the other hand, when the power amplifier PA is turned off, the influence of parasitic capacitance generated by the switch is minimized.

On the other hand, according to the structure of Figure 5, during the RF signal transmission, since there is no switch on the signal path (signal path), the output power loss due to the switch does not occur.

In addition, there is no switch, so that almost no loss of linearity due to power handling occurs.

In addition, by using the transformer 510, it is easy to move to an output impedance capable of outputting the power amplifier PA.

First, similarly to FIG. 5, the communication device 600a of FIG. 6A may include a low noise amplifier LA and a transformer 610a for insulation of the power amplifier PA.

According to the structure of FIG. 6A, the antenna AN and the power amplifier PA are connected to the input side 611 of the transformer 610a, and the low noise amplifier LA is connected to the output side 612 of the transformer 610a. Can be connected.

In the figure, the antenna AN is connected to the a node of the input side 611 of the transformer 610a, the power amplifier PA is connected to the c node of the input side 611 of the transformer 610a, and the transformer ( The low noise amplifier LA is connected to node b and node d of the output side 612 of 610a. Accordingly, the input of the low noise amplifier LA and the output of the power amplifier PA can be connected, and the performance degradation of the low noise amplifier LA and the power amplifier PA can be reduced.

According to the structure of FIG. 6A, when receiving an RF signal, a differential low noise amplifier LA can operate.

Next, similarly to FIG. 5, the communication device 600b of FIG. 6B may include a low noise amplifier LA and a transformer 610b for insulation of the power amplifier PA.

According to the structure of FIG. 6B, the antenna AN and the low noise amplifier LA are connected to the input side 613 of the transformer 610b, and the power amplifier PA is connected to the output side 614 of the transformer 610b. Can be connected.

In the figure, the antenna AN is connected to the a node of the input side 613 of the transformer 610b, the low noise amplifier LA is connected to the b node of the input side 613 of the transformer 610b, and the transformer ( The power amplifier PA is connected to the cc node and the cd node of the output side 614 of 610b.

As a result, the input of the low noise amplifier LA and the output of the power amplifier PA can be connected, and performance degradation of the low noise amplifier LA and the power amplifier PA can be reduced.

Meanwhile, according to the structure of FIG. 6B, the differential power amplifier PA may operate when transmitting the RF signal.

Next, the communication device 600c of FIG. 6C, similar to FIG. 5, may include a low noise amplifier LA, a first transformer 610c and a second transformer 617 for isolation of the power amplifier PA. Can be.

According to the structure of FIG. 6C, the antenna AN is connected to the input side 615 of the first transformer 610c, and the low noise amplifier LA is connected to the output side 610 of the first transformer 610c. The power amplifier PA may be connected to the output side of the two transformer 617.

The input side of the second transformer 617 may correspond to the input side 615 of the first transformer 610c.

According to the structure of FIG. 6C, when the RF signal is received, the differential low noise amplifier LA may operate, and when the RF signal is transmitted, the differential power amplifier PA may operate.

On the other hand, according to the structure of Figure 6c, when the RF signal is received, since there is no switch on the signal path (signal path), the loss due to the switch does not occur.

In addition, input matching of the low noise amplifier LA may be performed by using the inductor of the first transformer 610c.

On the other hand, according to the structure of Figure 6c, when the RF signal transmission, since there is no switch on the signal path (signal path), the output power loss due to the switch does not occur.

In addition, the use of the second transformer 617 facilitates movement to an output impedance capable of producing an output of the power amplifier PA.

Next, similarly to FIG. 5, the communication device 800a of FIG. 7A includes a low noise amplifier LA, a transformer 810 for insulation of the power amplifier PA, a transformer 810, and a low noise amplifier LA. It may include a switch (SW1) between.

According to the structure of FIG. 7A, an antenna AN and a power amplifier PA are connected to an input side 811 of a transformer 810, and a low noise amplifier LA is connected to an output side 812 of a transformer 810. The switch SW1 may be connected between one end of the input side 811 of the transformer 810 and the low noise amplifier LA.

In the figure, the antenna AN is connected to the a node of the input side 811 of the transformer 810, and the low noise amplifier LA and the switch SW1 are connected to the b node of the input side 811 of the transformer 810. A power amplifier PA is connected to node c at the output side 812 of the transformer 810, and a drive voltage source VDD for supplying a drive voltage is connected to node d.

On the other hand, one end of the switch SW1 may be connected between the transformer 510 and the low noise amplifier LA, and the other end thereof may be connected to the ground terminal GND.

According to the structure of FIG. 7A, an input of the low noise amplifier LA and an output of the power amplifier PA may be connected. Accordingly, a chip including the low noise amplifier LA and the power amplifier PA may be connected. The pin count can be reduced, allowing for chip integration.

FIG. 7B illustrates that the communication device 800a of FIG. 7A operates in a transmission mode.

Referring to the drawing, when the communication device 800a of FIG. 7A is in a transmission mode, the switch SW1 may be turned on and the low noise amplifier LA may be turned off.

In the transmission mode, the RF signal received through the antenna AN is directed to the ground terminal GND through the transformer 810 and the switch SW1 and is not input to the low noise amplifier LA.

Meanwhile, when the communication device 800a of FIG. 7A is in the transmission mode, the switch SW1 is turned on and the power amplifier PA may be turned on. According to this, the signal output from the power amplifier PA may be output to the outside via the antenna AN via the transformer 810.

FIG. 7C illustrates the communication device 800a of FIG. 7A operating in a receive mode.

Referring to the drawings, when the communication device 800a of FIG. 7A is in the reception mode, the switch SW1 may be turned off, and the low noise amplifier LA may be turned on.

According to this, the RF signal received through the antenna AN is input to the low noise amplifier LA via the transformer 810.

Meanwhile, when the communication device 800a of FIG. 7A is in the reception mode, the switch SW1 may be turned off, and the power amplifier PA may be turned off. According to this, the RF signal received through the antenna AN is not directed to the power amplifier PA.

Meanwhile, according to the structure of FIG. 7A, in the transmission mode, the parasitic components, which may occur when the low noise amplifier LA is turned off due to the switch SW1, may be prevented from degrading the performance of the power amplifier PA. It becomes possible.

In addition, according to the structure of FIG. 7A, in the transmission mode, when one side of the transformer 810 is grounded in the power amplifier PA, performance degradation may be minimized.

According to the structure of FIG. 7A, one end of the switch SW1 is connected between the transformer 510 and the low noise amplifier LA, rather than being connected in series between the transformer 510 and the low noise amplifier LA. The other end is connected to the ground terminal GND. Accordingly, the influence on the performance of the low noise amplifier LA can be minimized.

Next, the communication device 800b of FIG. 8A is similar to the communication device 800a of FIG. 7A, with a low noise amplifier LA, a transformer 810 for insulation of the power amplifier PA, a transformer 810, and the like. The switch SW1 between the low noise amplifiers LA may be further included, and further, the inductor L1 may be further connected to the switch SW1 in parallel.

One end of the switch SW1 is connected between the transformer 510 and the low noise amplifier LA, the other end is connected to the ground terminal GND, and the inductor L1 is connected in parallel to the switch SW1, One end is connected between 510 and low noise amplifier LA, and the other end is connected to ground terminal GND.

According to the structure of FIG. 8A, the input of the low noise amplifier LA and the output of the power amplifier PA may be connected. Accordingly, the chip including the low noise amplifier LA and the power amplifier PA may be connected. The pin count can be reduced, allowing for chip integration.

FIG. 8B illustrates that the communication device 800b of FIG. 8A operates in a transmission mode.

Referring to the drawing, when the communication device 800b of FIG. 8A is in the transmission mode, the switch SW1 may be turned on and the low noise amplifier LA may be turned off.

In the transmission mode, the RF signal received through the antenna AN is directed to the ground terminal GND via the transformer 810, the switch SW1, and the inductor L1, and is not input to the low noise amplifier LA. Will not.

Meanwhile, when the communication device 800b of FIG. 8A is in the transmission mode, the switch SW1 is turned on and the power amplifier PA may be turned on. According to this, the signal output from the power amplifier PA may be output to the outside via the antenna AN via the transformer 810.

8C illustrates the communication device 800b of FIG. 8A operating in a receive mode.

Referring to the drawings, when the communication device 800b of FIG. 8A is in the reception mode, the switch SW1 may be turned off, and the low noise amplifier LA may be turned on.

Meanwhile, when the communication device 800b of FIG. 8A is in the reception mode, the switch SW1 may be turned off, and the power amplifier PA may be turned off. According to this, the RF signal received through the antenna AN is not directed to the power amplifier PA.

Meanwhile, according to the structure of FIG. 8A, in the transmission mode, due to the switch SW1 and the inductor L1, parasitic components, which may occur when the low noise amplifier LA is turned off, degrade the performance of the power amplifier PA. It can be prevented from affecting.

In addition, according to the structure of FIG. 8A, in the transmission mode, when one side of the transformer 810 is grounded in the power amplifier PA, performance degradation may be minimized.

Meanwhile, according to the structure of FIG. 8A, one end of the switch SW1 is connected between the transformer 510 and the low noise amplifier LA, rather than being connected in series between the transformer 510 and the low noise amplifier LA. The other end is connected to the ground terminal GND. Accordingly, the influence on the performance of the low noise amplifier LA can be minimized.

Next, the communication device 800c of FIG. 9A is similar to the communication device 800a of FIG. 7A, with a low noise amplifier LA, a transformer 810 for insulation of the power amplifier PA, a transformer 810, and the like. A switch SW1 between the low noise amplifiers LA may be further included, and further, a second switch SW2 may be further disposed between both ends of the output side of the transformer 810.

One end of the switch SW1 is connected between the transformer 510 and the low noise amplifier LA, and the other end thereof is connected to the ground terminal GND.

One end of the second switch SW1 is connected between the c node and the other end of the d node.

According to the structure of FIG. 9A, an input of the low noise amplifier LA and an output of the power amplifier PA may be connected, and thus, a chip including the low noise amplifier LA and the power amplifier PA may be connected. The pin count can be reduced, allowing for chip integration.

9B illustrates the communication device 800c of FIG. 9A operating in a transmission mode.

Referring to the drawing, when the communication device 800c of FIG. 9A is in the transmission mode, the switch SW1 is turned on, the second switch SW2 is turned off, and the low noise amplifier LA may be turned off.

Meanwhile, when the communication device 800c of FIG. 9A is in the transmission mode, the switch SW1 is turned on, the second switch SW2 is turned off, and the power amplifier PA may be turned on. According to this, the signal output from the power amplifier PA may be output to the outside via the antenna AN via the transformer 810.

9C illustrates the communication device 800c of FIG. 9A operating in a receive mode.

Referring to the drawings, when the communication device 800c of FIG. 9A is in the reception mode, the switch SW1 may be turned off, the second switch SW2 may be turned on, and the low noise amplifier LA may be turned on.

Meanwhile, when the communication device 800c of FIG. 9A is in the reception mode, the switch SW1 may be turned off, the second switch SW2 may be turned on, and the power amplifier PA may be turned off. According to this, the RF signal received through the antenna AN is not directed to the power amplifier PA.

Meanwhile, according to the structure of FIG. 9A, in the transmission mode, the parasitic components, which may occur when the low noise amplifier LA is turned off due to the switch SW1, may be prevented from degrading the performance of the power amplifier PA. It becomes possible.

In addition, according to the structure of FIG. 9A, in the transmission mode, when one side of the transformer 810 is grounded in the power amplifier PA, performance degradation may be minimized.

Meanwhile, according to the structure of FIG. 9A, one end of the switch SW1 is connected between the transformer 510 and the low noise amplifier LA, rather than being connected in series between the transformer 510 and the low noise amplifier LA. The other end is connected to the ground terminal GND. Accordingly, the influence on the performance of the low noise amplifier LA can be minimized.

Meanwhile, similarly to the communication device 800c of FIGS. 9A to 9C, the communication device 800d of FIGS. 10A to 10C includes a low noise amplifier LA and a transformer 810 for insulation of the power amplifier PA. And a switch SW1 between the transformer 810 and the low noise amplifier LA, and further, a second switch SW2 disposed between both ends of the output side of the transformer 810.

On the other hand, the second switch SW2 in the communication device 800c of FIGS. 9A to 9C indicates that the second switch SW2 is disposed inside the transformer 810, and the second switch of the communication device 800d of FIGS. 10A to 10C. SW2 has a difference in that it is separately provided outside the transformer 810.

However, the second switch SW1 is identical in that one end of the output side of the transformer 810 is connected between the c node and the other d node.

Accordingly, the transmission mode, the reception mode, and the effects thereof of the communication device 800d of FIGS. 10A to 10C will be omitted with reference to FIGS. 9A to 9C.

Next, the communication device 800e of FIG. 11A, similarly to the communication device 500 of FIG. 5, includes a low noise amplifier LA and a transformer 810 for isolation of the power amplifier PA. It may further include an inductor ESD disposed between the antenna AN and the input side 811 of the transformer 810.

In particular, one end of the inductor ESD is connected between the antenna AN and the input side 811 of the transformer 810, and the other end is connected to the ground terminal GND.

According to the inductor ESD, it is possible to prevent circuit degradation due to parasitic capacitance when receiving an RF signal.

Next, the communication device 800f of FIG. 11B includes, similarly to the communication device 500 of FIG. 5, a low noise amplifier LA and a transformer 810 for isolation of the power amplifier PA. An inductor ESD may be further disposed between the input side 811 of the transformer 810 and the low noise amplifier LA.

In particular, one end of the inductor ESD is connected between the input side 811 of the transformer 810 and the low noise amplifier LA, and the other end is connected to the ground terminal GND.

Next, the communication device 800g of FIG. 12A is similar to the communication device 800a of FIG. 7A, with a low noise amplifier LA, a transformer 810 for isolation of the power amplifier PA, a transformer 810, and the like. A switch SW1 between the low noise amplifier LA may be further included, and further, the matching network MN may be further disposed between the switch SW1 and the low noise amplifier LA.

According to the matching network MN, the efficiency in receiving an RF signal may be increased.

Next, the communication device 800h of FIG. 12B is similar to the communication device 800a of FIG. 7A with a low noise amplifier LA, a transformer 810 for isolation of the power amplifier PA, and a transformer 810. A switch SW1 between the low noise amplifiers LA may further include a capacitor CSS disposed between both ends of the input side 811 of the transformer 810.

According to such a capacitor CSS, the efficiency in receiving an RF signal can be increased.

Next, the communication device 800i of FIG. 12C is similar to the communication device 800a of FIG. 7A with a low noise amplifier LA, a transformer 810 for isolation of the power amplifier PA, and a transformer 810. The switch SW1 between the low noise amplifiers LA may further include a matching network MN disposed between the antenna AN and the input side 811 of the transformer 810.

FIG. 14 is a diagram illustrating an internal circuit diagram of the communication device 900 including the low noise amplifier illustrated in FIG. 5 and the like, and a transformer 810 for insulation of the power amplifier.

Referring to the drawings, the RF signal from the antenna is received at the a terminal on the input side of the transformer 810, the inductor ESD, the switch Swy, the capacitor Cab, on the b terminal on the input side of the transformer 810. A switch Swz may be arranged.

The low noise amplifier LAB may be connected to one terminal of the switch Swz.

On the other hand, the capacitor (Caa) and the switch (Swx) may be disposed at the c terminal on the output side of the transformer 810, respectively.

The power amplifier PAB may be connected to one terminal of the switch Swx.

According to the drawing, since the low noise amplifier LAB and the power amplifier PAB are insulated around the transformer 810, the performance at the time of low noise amplification and power amplification can be ensured.

In particular, the input of the low noise amplifier LAB and the output of the power amplifier PAB may be connected. Accordingly, the pin of the chip including the low noise amplifier LAB and the power amplifier PAB. The number can be reduced, so that chip integration is possible.

14 is a diagram illustrating a communication device 1400.

Referring to the drawings, the communication device 1400 of FIG. 14 is a method of sharing a communication device 300a of FIG. 3A, in particular a receiver, and a communication device 300b of FIG. 3B, in particular, a transmitter. / LNA) (PLA1 to PLAn) is characterized by operating as a low power amplifier for reception or as a power amplifier for transmission.

Accordingly, the communication device 1400 includes a plurality of antennas AN1a to ANna, a plurality of amplifiers PA / LNA PLA1 to PLAn, a combiner XNc, an IQ mixer Mxa, and a variable A variable gain amplifier (VGA), a filter, a local oscillator (LO geberator) (LGa) and the like may be provided.

In this case, the plurality of amplifiers PA / LNA PLA1 to PLAn may have a bidirectional structure in which a receiver and a transmitter are shared.

Such a communication device 1400 of FIG. 14 may be implemented in a TDD manner instead of an FDD. In particular, the communication device 1400 may not operate at the same time.

Meanwhile, as illustrated in FIGS. 5 to 13, the plurality of amplifiers PA / LNA PLA1 to PLAn include a low noise amplifier LA that amplifies an RF signal received by the antenna AN, and an antenna AN. Power amplifier PA amplifying a signal outputted through the power amplifier), the low noise amplifier LA and the power amplifier PA are insulated, and connected to the antenna AN, the low noise amplifier LA, and the power amplifier PA. It may include a transformer.

In addition, the plurality of amplifiers PA / LNA PLA1 to PLAn may further include a switch SW1, a second switch SW2, or a capacitor as illustrated in FIGS. 5 to 13. CC may be further provided, an inductor ESD may be further provided, or a matching network MN may be further provided.

Accordingly, according to the phase array structure, since a plurality of amplifiers can be implemented in one chip, beamforming for a wide frequency band is possible.

In the time division duplexing (TDD) scheme, performance degradation of the low noise amplifier and the power amplifier can be reduced.

Meanwhile, the communication device illustrated in FIGS. 5 to 14 may be provided in the wireless communication unit 110 of the mobile terminal 100 illustrated in FIG. 2. Accordingly, it is possible to ensure the performance of the low noise amplifier and the power amplifier during RF reception and during RF transmission.

5 to 14 may be employed in various devices such as a vehicle, a drone, a network router, a fixed communication device, and the like, in addition to the mobile terminal 100 shown in FIG. 2.

16A illustrates a vehicle according to an embodiment of the present invention.

Referring to the drawings, the vehicle 200 may include wheels 203FR, 103FL, 103RL,... Rotated by a power source, a steering wheel for adjusting the traveling direction of the vehicle 200, and the like.

The vehicle 200 may include a communication unit or the like for communication with an external device. In particular, the communication unit may be provided in a vehicle driving assistance device for driving assistance of the vehicle 200 or an autonomous driving apparatus for autonomous driving of the vehicle 200.

In this case, the communication unit may include the communication device illustrated in FIGS. 5 to 14.

16B is a block diagram of the vehicle of FIG. 16A.

Referring to the drawings, the vehicle 200 may include an electronic control apparatus 700 for controlling the vehicle.

The electronic control apparatus 700 includes an input unit 710, a communication unit 720, a memory 740, a lamp driver 751, a steering driver 752, a brake driver 753, a power source driver 754, and a sunroof driver. 755, suspension driver 756, air conditioning driver 757, window driver 758, airbag driver 759, sensor unit 760, ECU 770, display 780, audio output unit 785. , The audio input unit 786, the power supply unit 790, the stereo camera 195, the plurality of cameras 295, the radar 797, the internal camera 708, the seat driver 761, and the driver detection sensor 799. It can be provided.

Meanwhile, in addition to the ECU 770, a separate processor for signal processing an image from a camera may be provided.

The input unit 710 may include a plurality of buttons or a touch screen disposed in the vehicle 200. Through a plurality of buttons or touch screens, it is possible to perform various input operations.

The communication unit 720 may exchange data with the mobile terminal 100 or a server (not shown) in a wireless manner. In particular, the communication unit 720 may exchange data wirelessly with the mobile terminal of the vehicle driver. As a wireless data communication method, various data communication methods such as Bluetooth, WiFi Direct, WiFi, and APiX are possible.

The communicator 720 may determine, from a mobile terminal 100 or a server (not shown), schedule time of a vehicle driver, schedule information related to a moving position, weather information, traffic state information of a road, for example, TPEG (Transport Protocol). Expert Group) information can be received.

On the other hand, when the user is in a vehicle, the mobile terminal 100 and the electronic control apparatus 700 of the user can perform pairing with each other automatically or by executing the user's application.

The memory 740 may store various data for operating the entire electronic control apparatus 700, such as a program for processing or controlling the ECU 770.

The memory 740 may store map information related to vehicle driving.

The lamp driver 751 may control turn on / off of lamps disposed inside and outside the vehicle. In addition, it is possible to control the intensity, direction, etc. of the light of the lamp. For example, control of a direction indicator lamp, a brake lamp, and the like can be performed.

The steering driver 752 may perform electronic control of a steering apparatus (not shown) in the vehicle 200. As a result, the traveling direction of the vehicle can be changed.

The brake driver 753 may perform electronic control of a brake apparatus (not shown) in the vehicle 200. For example, the speed of the vehicle 200 may be reduced by controlling the operation of the brake disposed on the wheel. As another example, by varying the operation of the brakes disposed on the left wheels and the right wheels, the traveling direction of the vehicle 200 may be adjusted to the left or the right.

The power source driver 754 may perform electronic control of the power source in the vehicle 200.

For example, when a fossil fuel-based engine (not shown) is a power source, the power source driver 754 may perform electronic control of the engine. Thereby, the output torque of an engine, etc. can be controlled.

As another example, when the electric based motor (not shown) is a power source, the power source driver 754 may perform control on the motor. Thereby, the rotation speed, torque, etc. of a motor can be controlled.

The sunroof driver 755 may perform electronic control of a sunroof apparatus (not shown) in the vehicle 200. For example, the opening or closing of the sunroof can be controlled.

The suspension driver 756 may perform electronic control of a suspension apparatus (not shown) in the vehicle 200. For example, when the road surface is curved, the suspension device may be controlled to control the vibration of the vehicle 200 to be reduced.

The air conditioning driver 757 may perform electronic control of an air cinditioner (not shown) in the vehicle 200. For example, when the temperature inside the vehicle is high, the air conditioner may operate to control the cool air to be supplied into the vehicle.

The window driver 758 may perform electronic control of a suspension apparatus (not shown) in the vehicle 200. For example, the opening or closing of the left and right windows of the side of the vehicle can be controlled.

The airbag driver 759 may perform electronic control of an airbag apparatus in the vehicle 200.

The seat driver 761 may perform position control on the seat or the back of the vehicle 200. For example, when the driver is seated in the driver's seat, the driver's seat can be adjusted according to the driver, adjusting the front and rear spacing of the seat, and adjusting the front and rear spacing of the backrest.

The sensor unit 760 senses a signal related to traveling of the vehicle 200. To this end, the sensor unit 760 may include a heading sensor, a yaw sensor, a gyro sensor, a position module, a vehicle forward / reverse sensor, and a wheel sensor. , A vehicle speed sensor, a vehicle body tilt sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor by steering wheel rotation, a vehicle internal temperature sensor, a vehicle internal humidity sensor, and the like.

As a result, the sensor unit 760 includes vehicle direction information, vehicle position information (GPS information), vehicle angle information, vehicle speed information, vehicle acceleration information, vehicle tilt information, vehicle forward / reverse information, battery information, fuel information, A sensing signal may be acquired for tire information, vehicle lamp information, vehicle interior temperature information, vehicle interior humidity information, and the like.

On the other hand, the sensor unit 760 may include an accelerator pedal sensor, a pressure sensor, an engine speed sensor, an air flow sensor (AFS), an intake temperature sensor (ATS), a water temperature sensor (WTS), and a throttle. Position sensor (TPS), TDC sensor, crank angle sensor (CAS), etc. may be further provided.

The ECU 770 may control the overall operation of each unit in the electronic control apparatus 700.

By an input by the input unit 710, a specific operation may be performed, a signal sensed by the sensor unit 760 may be received, map information may be received from the memory 740, and various driving

units

751, 752, 753, 754, 756. Can control the operation of.

In addition, the ECU 770 may receive weather information, road traffic condition information, for example, TPEG (Transport Protocol Expert Group) information from the communication unit 720.

Meanwhile, the ECU 770 may generate an around view image by combining the plurality of images received from the plurality of cameras. In particular, when the vehicle is below a predetermined speed or when the vehicle reverses, an around view image may be generated.

The display 780 may display an image in front of the vehicle while the vehicle is driving or an around view image while the vehicle is slowing. In particular, it is possible to provide various user interfaces in addition to the around view image.

In order to display the around view image or the like, the display 780 may include a cluster or a head up display (HUD) on the front surface of the vehicle. On the other hand, when the display 780 is a HUD, it may include a projection module for projecting an image on the windshield of the vehicle 200. Meanwhile, the display 780 may include a touch screen that can be input.

The audio output unit 785 converts the electrical signal from the ECU 770 into an audio signal and outputs the audio signal. To this end, a speaker or the like may be provided. The audio output unit 785 may output a sound corresponding to the operation of the input unit 710, that is, the button.

The audio input unit 786 may receive a user voice. To this end, a microphone may be provided. The received voice may be converted into an electrical signal and transmitted to the ECU 770.

The power supply unit 790 may supply power required for the operation of each component under the control of the ECU 770. In particular, the power supply unit 790 may receive power from a battery (not shown) in the vehicle.

The stereo camera 195 is used for the operation of the vehicle driving assistance apparatus. This description is omitted with reference to the above.

The plurality of cameras 295 is used to provide an around view image, and may have four cameras, for example. In detail, the plurality of cameras 295 may be disposed at the left side, the rear side, the right side, and the front side of the vehicle, respectively. The plurality of images captured by the plurality of cameras 295 may be transferred to the ECU 770 or a separate processor (not shown).

The internal camera 708 captures images of the interior of the vehicle, including the driver. For example, an RGB camera, an IR camera after thermal sensing, etc. can be illustrated.

The driver detection sensor 799 detects body information of the driver. For example, the driver may detect blood pressure information, sleep waves, and the like.

The radar 797 transmits a transmission signal and receives a reception signal reflected from an object around the vehicle. And distance information can be output based on the difference between a transmission signal and a reception signal. In addition, phase information may be further output.

Meanwhile, the communication unit 730 or the radar 797 of FIG. 16B may include the communication device illustrated in FIGS. 5 to 14.

In addition, although the preferred embodiment of the present invention has been shown and described above, the present invention is not limited to the specific embodiments described above, but the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

Claims

antenna;

A low noise amplifier for amplifying the RF signal received at the antenna;

A power amplifier for amplifying the signal output through the antenna;

And a transformer insulated from said low noise amplifier and said power amplifier, said transformer being connected to said antenna, said low noise amplifier, and said power amplifier.
The method of claim 1,

The antenna and the low noise amplifier are connected to an input side of the transformer,

And the power amplifier is connected to an output side of the transformer.
The method of claim 2,

And the power amplifier is connected to both ends of an output side of the transformer.
The method of claim 1,

The antenna and the power amplifier are connected to an input side of the transformer,

And the low noise amplifier is connected to an output side of the transformer.
The method of claim 1,

The transformer,

And a first transformer to which the antenna is connected to an input side and the low noise amplifier to an output side, and a second transformer to which the power amplifier is connected to an output side.
The method of claim 1,

And a switch connected between the transformer and the low noise amplifier.

The antenna and the low noise amplifier are connected to an input side of the transformer,

And the power amplifier is connected to an output side of the transformer.
The method of claim 6,

In the transfer mode, the switch is turned on,

In a receive mode, the switch is turned off.
The method of claim 6,

And a second switch connected between opposite ends of the other of the input side and the output side of the transformer.
The method of claim 8,

In the transfer mode, the switch is on, the second switch is off

In the receive mode, the switch is turned off, the second switch is on.
The method of claim 8,

And a capacitor disposed between both ends of an output side of the transformer and connected to the second switch.
The method of claim 1,

And an inductor disposed between the antenna and the input side of the transformer and between a ground terminal.
The method of claim 1,

And an inductor disposed between the transformer and the low noise amplifier and between a ground terminal.
The method of claim 6,

And a matching network connected between the transformer and the low noise amplifier.
The method of claim 6,

And a matching network connected between the antenna and the transformer.
The method of claim 6,

And a capacitor connected to both ends of the input side of the transformer.
antenna;

A low noise amplifier for amplifying the RF signal received at the antenna;

A power amplifier for amplifying the signal output through the antenna;

A transformer connected to said antenna, said low noise amplifier, and said power amplifier;

And a switch connected between the transformer and the low noise amplifier.
A mobile terminal comprising the communication device of any one of claims 1 to 16.
A vehicle comprising the communication device as claimed in claim 1.