KR20140128014A - Mobile terminal for reducing an insertion loss - Google Patents

Mobile terminal for reducing an insertion loss Download PDF

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Publication number
KR20140128014A
KR20140128014A KR1020130046596A KR20130046596A KR20140128014A KR 20140128014 A KR20140128014 A KR 20140128014A KR 1020130046596 A KR1020130046596 A KR 1020130046596A KR 20130046596 A KR20130046596 A KR 20130046596A KR 20140128014 A KR20140128014 A KR 20140128014A
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KR
South Korea
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band
signal
switch
input
output
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KR1020130046596A
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Korean (ko)
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이병열
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엘지전자 주식회사
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Priority to KR1020130046596A priority Critical patent/KR20140128014A/en
Publication of KR20140128014A publication Critical patent/KR20140128014A/en

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
    • H03K17/693—Switching arrangements with several input- or output-terminals, e.g. multiplexers, distributors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
    • H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
    • H04B1/006—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using switches for selecting the desired band
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/50—Circuits using different frequencies for the two directions of communication
    • H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transceivers (AREA)

Abstract

The present invention provides a terminal device comprising: a first duplexer for duplexing a signal on a first band; a second duplexer for duplexing a signal on a second band; a diplexer for performing band separation between a signal on the first band and a signal on the second band; an output switch which is located at an output stage of the diplexer; a first input switch which is located at an input stage of the diplexer, and sends a signal on the first band passing through the first duplexer to one among a divider and the output switch; and a second input switch which is located at the input state of the diplexer, and sends a signal on the second band passing through the second duplexer to one among the divider and the output switch.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a terminal device for reducing insertion loss,

The present invention relates to a terminal apparatus for reducing insertion loss.

Recently, technology for LTE-A (Long Term Evolution Advanced) has been actively developed for high-speed data transmission. The characteristic of LTE-A distinguished from conventional LTE is that it can increase throughput by using carrier frequency more than twice as much as LTE through Carrier Aggregation (CA).

The frequency combinations introduced in LTE-A include combinations of interband non-contiguous types, combinations of intra band contiguous types, and intra band non-contiguous types Combinations are representative. Of these, a combination of non-interband non-adjacent forms is expected to be used by a large number of operators.

The frequency combination of non-interband non-contiguous forms usually has a combination of a low band frequency and a mid band frequency (or a high band frequency), while a low band frequency has a frequency of 1 GHz or less And the middle band frequency refers to the 1 GHz to 2 GHz second frequency band.

In the standardization phase of LTE-A by the 3rd Generation Partnership Project (3GPP), there is still an architecture for a combination of low band frequencies, a combination of middle band frequencies, a combination of high band frequencies, ) And the degree of loss tolerable for each combination was not determined. However, when the frequencies of the listed combinations are located adjacent to each other and the plurality of signals received by the listed combinations are to be separated into individual signals, the terminal may be a distributor such as a Diplexer or a Divider . However, when a distributor is added to a terminal, insertion loss occurs due to addition of a diplexer. Thereby, more losses (e.g., more than 3 to 4 dB) may occur, compared to losses occurring at low band frequencies and medium band frequencies (or high band frequencies) (typically less than 1 dB).

If the terminal device is a multimode terminal device using at least one of legacy communication methods such as GSM, EDGE, CDMA, WCDMA, and LTE together with an evolved communication method of LTE-A, Losses will lead directly and seriously to the performance of the legacy communication method sharing the same path. Moreover, the influence due to the insertion loss occurs not only in the reception path but also in the transmission path, and may cause various problems such as transmission performance deterioration, transmission performance degradation, and power consumption increase.

It is an object of the present invention to provide a terminal device for reducing insertion loss.

Furthermore, it is an object of the present invention to provide a terminal device capable of improving transmission and reception performance by reducing insertion loss.

The technical problems to be solved by the present invention are not limited to the technical problems and other technical problems which are not mentioned can be understood by those skilled in the art from the following description.

A terminal device for achieving the above object includes a first duplexer for duplexing a signal of a first band; A second duplexer for duplexing the signal of the second band; A separator for band-separating the signal of the first band and the signal of the second band; An output switch located at an output end of the separator; A first input switch located at an input terminal of the separator and for branching the signal of the first band passed through the first duplexer to either the branching device or the output switch; And a second input switch which is located at an input terminal of the separator and which divides the signal of the second band passed through the second duplexer to one of the branch and the output switch.

In this case, when the terminal device uses a first wireless communication scheme supporting Carrier Aggregation (CA), the signal of the first band and the signal of the second band pass through the separator, And the second input switch is set such that the signal of the first band and the signal of the second band are input to the separator, and the output switch is configured to receive the signal of the first band and the signal of the second band As shown in FIG.

Alternatively, when the terminal device uses a second wireless communication scheme that does not support carrier aggregation in the first band, the signal of the first band and the signal of the second band may not pass through the separator, The first input switch is set to input the signal of the first band to the output switch and the output switch can be set to receive the signal of the first band from the first input switch.

Here, the separator may include at least one of a diplexer and a divider.

Further, the output switch may be a single pole triple throw (SP3T) switch selectively connected to the separator, the first and second input switches, and the first and second input switches are connected to the separator, Output switch and a single pole double throw (SPDT) switch selectively connected to any one of the output switches.

The output switch, the separator, and the first and second input switches may be implemented as a single chip.

The present invention has the effect of reducing the insertion loss of the terminal apparatus.

Furthermore, the present invention has the effect of improving the transmission and reception performance by reducing the insertion loss of the terminal apparatus.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
1 is an exemplary diagram illustrating an RF front-end structure applicable to a general multimode multi-band terminal device.
2 illustrates an RF front-end structure in which a plurality of low-band signals (L2 / L3) with diplexers are processed.
3 and 4 are block diagrams of an RF front-end that can be applied to a terminal device according to the present invention.
5 and 6 are block diagrams of an RF front-end that can be applied to a terminal device according to the present invention.
Figure 7 compares when the switch is applied to the input / output stage of the diplexer in terms of cell radius and when it is not.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the following detailed description, the word " / " can be understood to include the meaning of " and " and " or " Further, the detailed description set forth below with reference to the appended drawings is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced.

The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, those skilled in the art will appreciate that the present invention may be practiced without these specific details. For example, the following detailed description assumes that the mobile communication system is an IEEE (Institute of Electrical and Electronics Engineers) 802.16 system or a 3GPP (3rd Generation Partnership Project). However, the IEEE 802.16 system, The present invention is applicable to any other mobile communication system.

In some instances, well-known structures and devices may be omitted or may be shown in block diagram form, centering on the core functionality of each structure and device, to avoid obscuring the concepts of the present invention. In the following description, the same components are denoted by the same reference numerals throughout the specification.

In the following description, it is assumed that a terminal device (or a terminal) collectively refers to a mobile stationary or stationary user equipment such as a UE (User Equipment), an MS (Mobile Station), and an AMS (Advanced Mobile Station).

In describing Carrier Aggregation (CA) in the present invention, a maximum bandwidth range that a Radio Frequency (RF) chip can receive is referred to as a system bandwidth, and a carrier for a system bandwidth is referred to as a Component Carrier ).

In the present invention, a multimode terminal device refers to a terminal device that supports both an advanced communication method and an existing communication method, and the multiband terminal device may refer to a terminal device supporting a carrier aggregation (CA). Accordingly, it can be understood that the multimode multi-band terminal device is a terminal device that supports carrier convergence while supporting both the advanced communication method and the existing communication method.

For convenience of explanation, it is assumed that LTE-A supporting CA is an advanced communication method, and GSM, EDGE, CDMA, WCDMA, and LTE that do not support CA are existing communication methods.

1 is an exemplary diagram illustrating an RF front-end structure applicable to a general multimode multi-band terminal device. 1, each of the multimode multiband terminal apparatuses includes three low bands 1-3, L1-3, a middle band 1-3 and a high band 1-3, , H1-3) signals.

Referring to FIG. 1, when a plurality of signals for a low band, a middle band, and a high band are generated by an RF (Radio Frequency) chip, a low band L2 / L3 signal passes through a diplexer 11 And either one of the L1 signal and the L2 / L3 signal can be selectively transmitted through the antenna 30 through the antenna switch 21.

Likewise, the middle / high band signals pass through the diplexers 13, 15 and 17 different in the M2 / M3 band, the M3 / H2 band and the H2 / H3 band, M2 / M3, M3 / H2, H1, and H2 / H3 can be selectively transmitted (30) through the antenna.

As in the example shown in FIG. 1, signals located in adjacent bands (e.g., L2 / L3, M2 / M3, H2 / H3, M3 / H2) must pass through the same diplexer. This is to make it possible to process two CCs at the same time due to the characteristics of LTE-A.

Accordingly, in a multi-mode terminal supporting both the advanced communication method and the conventional communication method, a diplexer for supporting the CA of the advanced communication method should be provided. However, performance degradation due to insertion loss can not be avoided if a plurality of signals generated in the conventional communication method are transmitted through the diplexer. The degradation of the communication performance caused by passing through the diplexer will be described in more detail with reference to FIG.

2 illustrates an RF front-end structure in which a plurality of low-band signals (L2 / L3) with diplexers are processed. 2, the transmission path and the reception path are set to pass through the diplexer 40, so that the transmission (Tx) path and the reception (Rx) path It can be expected that performance degradation will occur in all. Specifically, the increase in insertion loss due to the diplexer can reduce Rx and Tx performance by about 4dB. This causes the cell radius to decrease by 4dB from the network point of view and causes frequent handover due to cell capacity reduction. If the Tx power is increased to compensate for deteriorated performance even in the case of the terminal device, the transmission linearity is deteriorated and the power consumption is rapidly increased, shortening the use time of the terminal device.

In order to minimize the insertion loss caused by inserting the diplexer, the terminal apparatus according to the present invention switches the input and output of the diplexer so that a plurality of signals conforming to the existing communication system are not passed through the diplexer We propose a method that can be input / output. A detailed description will be made with reference to the following drawings. In the following drawings, the input and output stages of the diplexer are separated based on the Tx path for convenience of explanation. That is, it is assumed that the side receiving the signal through the duplexer is assumed to be the input end of the diplexer, and the side outputting the signal through the antenna is the output end of the diplexer. Further, a switch connected to the input terminal of the duplexer is referred to as an input switch, and a switch connected to the output terminal of the duplexer is referred to as an output switch.

3 and 4 are block diagrams of an RF front-end that can be applied to a terminal device according to the present invention. FIG. 3 is for explaining when the terminal device is using the advanced communication method, and FIG. 4 is for explaining when the terminal device is using the existing communication method. For convenience of explanation, it is assumed in Fig. 3 and Fig. 4 that the terminal apparatus can process two low-band (L2 and L3) signals.

3 and 4, the RF front-end of the terminal device according to the present invention includes a diplexer 110, an output terminal of the diplexer and an output switch 120 connected to the antenna, an output switch, and a diplexer A first duplexer 142 connected to the first input switch 132 and a second duplexer 144 connected to the second input switch 134. The first and second input switches 132 and 134 are connected to an input terminal of the first input switch 132, .

The duplexers 142 and 144 are devices that protect the receiver from the transmission output when transmitting to jointly use one antenna for transmission and reception, and supply an echo signal to the receiver when receiving. The first duplexer 142 duplexes a specific band (e.g., L2) signal output from the RF chip and a reception signal corresponding to a specific band (for example, L2) received from the antenna, 144 duplexes a specific band (for example, L4) signal output from the RF chip and a reception signal corresponding to a specific band (for example, L4) received from the antenna.

A diplexer 110 is a device that transmits signals from two circuits separately to one circuit without interfering with each other. (LPF) and a low-pass filter (LPF) in which a low-frequency signal is passed through, because two signals having a frequency difference of only two can be separated only by a band. And a high-pass filter (HPF) through which a high-frequency signal passes. The diplexer 110 can band-split the L2 signal having passed through the first duplexer 142 and the L4 signal having passed through the second duplexer 144, and deliver the signal to the output switch 120.

The output switch 120 is selectively connected to the diplexer 110 and the first and second input switches 132 and 134 and the first and second input switches 132 and 134 are connected to the diplexer 110 and the output And the switch 120 may be selectively connected. The output switch 120 is an SP3T (Single Pole Triple Throw) switch capable of selecting any one of three contact points. The first and second input switches 132 and 134 are switches for selecting one of the two SPDTs Pole Triple Throw switch.

First, when the terminal device uses the advanced communication method supporting CA, the output of the first duplexer 142 (i.e., the L2 signal) and the output of the second duplexer 144 (I.e., the L3 signal) should be directed to the diplexer 110. Accordingly, the first and second input switches 132 and 134 can be set to be connected to the input of the diplexer (i.e., select S22 and S31). The output switch 120 may be set to be connected to the output terminal of the diplexer 110 to receive a plurality of signals output from the diplexer 110 (i.e., select S12).

On the other hand, when the terminal device uses the existing communication method of the L2 band, in order to reduce the influence of the insertion loss caused by the diplexer 110, the output of the first duplexer 142 (i.e., the L2 signal) It can be set so as not to pass through the plexer 110. To this end, the first input switch 132 may be configured to be coupled to the output switch 120 (i.e., select S21), and the output switch 120 may be configured to be coupled to the first input switch 132 Namely, S11 is selected). Thus, the insertion loss of the diplexer 110 is not applied, and the insertion loss of the input 132 and the output switch 120, which are smaller than the insertion loss of the diplexer 110, .

At this time, since the L3 band is not used while the terminal device uses the existing communication method of the L2 band, the second input switch 134 may be connected to either side (that is, regardless of whether the terminal is connected to S31 or S32 ).

The second input switch 134 is set to be connected to the output switch 120 (i.e., selects S32), and the output switch 120 is set to the second Input switch 134 (i.e., select S13). Since the L2 band is not used, the first input switch 132 may be connected to either one.

A multimode multiband terminal device supporting CA may use a divider instead of a diplexer in some cases. For example, when frequency band # 2 (Band 2, B2) and frequency band # 4 (Band 4, B4) are used, the Rx frequency of B4 is higher than the Rx frequency of B2 while the Tx frequency is lower than the Tx frequency of B2 , It is difficult to use a diplexer which must be clearly separated into a low frequency and a high frequency. Accordingly, a mobile terminal using a B2 / B4 band can use a divider instead of a diplexer. Even when a divider is used instead of the diplexer, the terminal device according to the present invention can be applied to the switches described with reference to FIGS. 3 and 4 as they are. A detailed description thereof will be made with reference to FIGS. 5 and 6. FIG.

5 and 6 are block diagrams of an RF front-end that can be applied to a terminal device according to the present invention. FIG. 5 is for explaining when the terminal device is using the advanced communication method, and FIG. 6 is for explaining when the terminal device is using the existing communication method. For convenience of explanation, it is assumed in Figs. 5 and 6 that the terminal apparatus can process signals of the B2 / B4 band.

The output switch 120 is selectively connected to either the divider 112 or the first and second input switches 132 and 134 and the first and second input switches 132 and 134 are connected to the divider 112 and the output switch 120, And may be selectively connected to any one of them.

First, when the terminal device uses the advanced communication method supporting CA, the output of the first duplexer 142 (i.e., the B4 signal) and the output of the second duplexer 144 (I.e., the B2 signal) should be directed to the divider 112. Accordingly, the first and second input switches 132 and 134 may be set to be connected to the input of the divider 112 (i.e., select S22 and S31). The output switch 120 may be configured to be connected to the output of the divider 112 to receive a plurality of signals output from the divider 112 (i.e., select S12).

On the other hand, when the terminal device uses the existing communication method of the B4 band, in order to reduce the influence of the insertion loss caused by the divider 112, the output of the first duplexer 142 (i.e., the B4 signal) ). ≪ / RTI > To this end, the first input switch 132 may be configured to be coupled to the output switch 120 (i.e., select S21), and the output switch 120 may be configured to be coupled to the first input switch 132 Namely, S11 is selected). Thus, since the B4 signal avoids the path through the divider 112, the insertion loss of the divider 112 is not applied, and the insertion loss of the input and output switches 120 smaller than this is reflected.

At this time, since the B2 band is not used while the terminal device uses the existing communication method of the B4 band, the second input switch 134 may be connected to either side (that is, regardless of whether it is connected to either S31 or S32 ).

The second input switch 134 is set to be connected to the output switch 120 (i.e., selects S32), and the output switch 120 is set to the second Input switch 134 (i.e., select S13). Since the B4 band is not used, the first input switch 132 may be connected either way.

In FIGS. 3 and 4, the terminal device processes signals in the L2 / L4 band. In FIGS. 5 and 6, the terminal device is illustrated as capable of processing signals in the B2 / B4 band. However, But the present invention is not limited thereto. Examples of combinations of various frequency bands other than the combination of the illustrated frequency bands may be applied to the present invention. Among them, the present invention will be more advantageous in a combination of frequency bands in which insertion loss is relatively large.

Table 1 lists examples where the insertion loss is relatively large among combinations of non-interband non-adjacent shapes.

Band configuration Inter Band Planned carrier Low + Low 5 + 17 ATT 5 + 12 USC 20 + 8 Mid + Mid 2 + 4 TMO 1 + 21 DCM 1 + 11 SB, KDDI High + High 38 + 40 China Mobile Mid + High 3 + 7 VF, Telia 1 + 7 China Telecom

The insertion loss of the diplexer varies depending on the frequency interval between the used frequency and the CC. For example, when the low-frequency band # 17 and the low-frequency band # 5 are combined, an insertion loss of about 2.5 dB occurs, and when the high-frequency band # 38 and # 40 are combined, Lt; / RTI >

When the switch is adopted so as not to pass through the diplexer as in the example shown in Figs. 3 to 6, the insertion loss caused by passing through the switch is smaller than the insertion loss caused by passing through the diplexer . For example, an insertion loss of about 0.3 dB occurs at a low band of 1 GHz or less, an insertion loss of about 0.5 dB at a middle band of 1 GHz to 2 GHz, and a loss of about 0.7 dB at a high band of 2.3 GHz or more Insertion loss occurs. Accordingly, when a switch is adopted and used, the occurrence of insertion loss can be reduced as compared with the case where the switch is not used.

For example, Table 2 compares the insertion loss caused by the diplexer (or divider) by frequency combination and the insertion loss caused by the switch in LTE-A.

division B17 + B5
(Low + Low) B2 + B4
(Mid + Mid) B38 + B40
(High + High) B1 + B7
(Mid + High) B2 + B4
(Mid + Mid) Diplexer (or Divider) 2.5dB 4.5dB (Multiplexer) 4dB 1.5dB 4dB (Divider) Switch
(Sum of input and output) 0.6dB
(0.3 dB + 0.3 dB) 1.0dB
(0.5 dB + 0.5 dB) 1.4dB
(0.7 dB + 0.7 dB) 1.2dB
(0.5 dB + 0.7 dB) 1.0dB
(0.5 dB + 0.5 dB) Insertion loss difference -1.9 -3.5 -2.6 -0.3 -3.0

In addition to the reduction of the insertion loss, when the switch is adopted, the reception performance can be expected to be improved more than when only the diplexer is used.

For example, assuming a combination of low-frequency frequencies and a bandwidth of 10 MHz in terms of reception performance, Table 3 and Table 4 show noise figure (NF) when using only a diplexer and a switch, FIG. Table 3 shows the noise figure when only the diplexer is used and Table 4 shows the noise figure when the switch is applied to the input / output stage of the diplexer.

division Diplexer Switch Diplexer (L / L) Duplexer RFIC NF Gain -0.3 -0.3 -2.5 -2.2 90 F (dB) 0.3 0.3 2.5 2.2 3 8.3

division Diplexer Switch Switch (in / out) Duplexer RFIC NF Gain -0.3 -0.3 -0.6 -2.2 90 F (dB) 0.3 0.3 0.6 2.2 3 6.4

As shown in Table 3 and Table 4, when the diplexer is used alone, the noise figure is 8.3 dB. When the switch is applied to the input / output stage of the diplexer, the noise figure is 6.4 dB. The noise figure of about 1.9 dB It is seen that the effect of decreasing the amount of water is decreased.

Due to the reduction of the noise figure, the performance improvement can be expected even in the sensitivity. For example, when the diplexer alone is used, the sensitivity is -99.16 dBm / 10 MHz (specifically -174 + 10 log (9 MHz) + 8.3-3 = -99.16 dBm) It is found that the sensitivity of about 1.9 dB is decreased with the sensitivity of -101.06 dBm / 10 MHz (specifically, -174 + 10 log (9 MHz) + 6.4 -3 = -101.06 dBm).

If the switch is applied to the input / output of the diplexer, the Tx performance can also be improved. Considering whether the RF preprocessing unit can output 23dBm at maximum power, if the loss in the RF preprocessing unit using only the duplexer is 5.3dB, the output power at PAM (Power Amplitude) is 28.3dBm (23dBm + 5.3dBm). On the contrary, if the loss in the RF preprocessing unit applying the switch to the input / output of the diplexer is 3.4 dB, the output power in the PAM should be able to output 26.4 dBm.

Since the maximum output of a general PAM does not exceed 27.5dBm, it is difficult to realistically achieve 28.3dBm of PAM output required when only a diplexer is applied. Accordingly, the maximum power in the preprocessing unit should be reduced by 0.8 dBm, which causes a problem of reducing the cell radius by 0.8 dBm. On the other hand, when the switch is applied to the input / output terminal of the diplexer, the required PAM output power of 26.4dBm can be realized by the general PAM, so that the required power of 23dBm can be satisfied.

Even if the output of the PAM can be increased to 28.3 dBm, there is a problem that the power consumption is increased because the current consumption is increased to increase the output of the PAM. Specifically, if a PAM consuming about 350mA of current to output 27dBm level is designed to output 28.3dBm, an additional current of about 100mA will be consumed. Accordingly, when the diplexer alone is applied, the power consumed to output the required PAM output power of 28.3dBm will be higher than the power required when the switch is applied to the input / output of the diplexer.

That is, when the switch is applied to the input / output terminal of the diplexer, the consumed power of the terminal device can be reduced even when only the diplexer is applied.

Figure 7 compares when the switch is applied to the input / output stage of the diplexer in terms of cell radius and when it is not. Assuming that a free space path loss (PSPL) is applied to the low-frequency band # 17 and a bandwidth of 10 MHz and a sensitivity level of the base station are -100 mBm / 10 MHz, when the diplexer alone is applied, The output of the device is 21.9dBm. When the switch is applied to the input / output of the diplexer, the output of the terminal device can be simulated as 23dBm. Accordingly, when the diplexer alone is applied, the cell radius is about 8 km, whereas when the switch is applied to the input / output terminal of the diplexer, the cell radius may be about 10 km.

As described above, when the switch is applied to the input / output terminals of the diplexer (or divider), the performance of the terminal device can be improved, as compared with the case where only the diplexer (or the divider) is applied.

Two input switches, a diplexer (or divider), and one output switch, illustrated in Figures 3 to 6, can minimize insertion loss from a functional standpoint. However, when each of the functional units is adopted as a separate device, it may occupy a considerable area and cause a size adjustment problem related to the terminal device. In addition, two input switches, a diplexer (or divider), and one output switch, illustrated in Figures 3 to 6, may be designed as one integrated module.

Figures 7 and 8 are diagrams illustrating the integrated module. When two input switches, a diplexer (or a divider) and one output switch are separate elements, as in the example shown in Figs. 7 and 8, each of the two input switches and one output switch has a contact point Control / power block for control. In contrast, when two input switches, a diplexer (or divider), and one output switch are designed as integrated modules, the three control / power blocks of the switch can be implemented together to achieve the same function in a smaller size .

The embodiments described above are those in which the elements and features of the present invention are combined in a predetermined form. Each component or feature shall be considered optional unless otherwise expressly stated. Each component or feature may be implemented in a form that is not combined with other components or features. It is also possible to construct embodiments of the present invention by combining some of the elements and / or features. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments. It is clear that the claims that are not expressly cited in the claims may be combined to form an embodiment or be included in a new claim by an amendment after the application.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

110: diplexer
112: Divider
120: Output switch
132: first input switch
134: second input switch
142: first duplexer
144: second duplexer

Claims (7)

A first duplexer for duplexing a signal of the first band;
A second duplexer for duplexing the signal of the second band;
A separator for band-separating the signal of the first band and the signal of the second band;
An output switch located at an output end of the separator;
A first input switch located at an input terminal of the separator, for branching the signal of the first band passed through the first duplexer to one of the branch and the output switch; And
A second input switch which is located at an input terminal of the separator and which branches the signal of the second band passed through the second duplexer to one of the branching device and the output switch,
. The method according to claim 1,
Wherein when the terminal device uses a first wireless communication scheme supporting Carrier Aggregation (CA), the signal of the first band and the signal of the second band pass through the separator,
Wherein the first and second input switches are set such that a signal of the first band and a signal of the second band are input to the separator and the output switch is connected to the signal of the first band and the signal of the second band Band signal is inputted to the terminal device. The method according to claim 1,
Wherein when the terminal device uses a second wireless communication scheme that does not support carrier aggregation in the first band, the signal of the first band and the signal of the second band do not pass through the separator,
Wherein the first input switch is set to input the first band signal to the output switch, and the output switch is set to receive the first band signal from the first input switch. The method according to claim 1,
Wherein the separator comprises at least one of a diplexer and a divider. The method according to claim 1,
Wherein the output switch is a single pole triple throw (SP3T) switch that is selectively connected to any one of the separator, the first and second input switches. The method according to claim 1,
Wherein the first and second input switches are single pole double throw (SPDT) switches selectively connected to any one of the separator and the output switch. The method according to claim 1,
Wherein the output switch, the separator, and the first and second input switches are implemented as a single chip.
KR1020130046596A 2013-04-26 2013-04-26 Mobile terminal for reducing an insertion loss KR20140128014A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190104874A (en) * 2018-03-01 2019-09-11 가부시키가이샤 무라타 세이사쿠쇼 High-frequency front end circuit and communication device including the same
US10608677B2 (en) 2018-03-01 2020-03-31 Murata Manufacturing Co., Ltd. High-frequency front end circuit and communication device including the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190104874A (en) * 2018-03-01 2019-09-11 가부시키가이샤 무라타 세이사쿠쇼 High-frequency front end circuit and communication device including the same
US10608677B2 (en) 2018-03-01 2020-03-31 Murata Manufacturing Co., Ltd. High-frequency front end circuit and communication device including the same

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