KR100764980B1 - Quintplexer - Google Patents

Abstract

A quintplexer is provided to have a reduced size by using the smallest number of electronic elements, reduce a cost, and improve transmission/reception quality by effectively blocking interference between adjacent circuits. The first signal separating unit(110) includes the first choke circuit(112) for blocking the third signal, the first PSN(Phase Shift Network) circuit for blocking the second signal, and the first separator(116) for separating a transmission/reception signal of the first signal, and is connected with an antenna(200). The second PSN circuit(120) is connected with the antenna(200) and blocks the first signal. The second signal separating unit(140) is connected with the second PSN circuit(120), and includes the second choke circuit(142) for blocking the third signal and the second separator(144) for separating a transmission/reception signal of the second signal. The third signal separating unit(130) is connected with the second PSN circuit(120) and blocks the second signal to pass the third signal. The first PSN circuit(114) includes a BPF(Band Pass Filter). At least one of the first and second choke circuits(112,142) includes an LC tank.

Description

Quintplexer

1 is a block diagram schematically illustrating the components of a conventional triple band mobile communication terminal.

2 is a block diagram schematically illustrating components of a quintplexer in accordance with an embodiment of the present invention;

3 is a circuit block diagram illustrating a case in which the components of the quintplexer are implemented as elements according to an embodiment of the present invention.

4 is a Smith chart illustrating input impedance characteristics of a DCN duplexer according to an embodiment of the present invention.

<Explanation of symbols for main parts of drawing>

100: quintplexer 110 according to the present invention: first signal separation unit

112: first choke circuit 114: first PSN (Phse Shift Network) circuit

116: first separator 120: second PSN circuit

130: third signal separator 140: second signal separator

142: second choke circuit 144: second separator

200: antenna 300: PCS Tx processing unit

400: PCS Rx processing unit 500: GPS Rx processing unit

600: DCN Tx processing unit 700: DCN Rx processing unit

The present invention relates to a quintplexer used in a dual band tri-mode terminal.

At present, the mobile communication terminal is equipped with a GPS (Global Position Service) function as a basic function. For example, the FCC's E911 may be equipped with wireless positioning, that is, a location tracking function through a GPS satellite, to enable location tracking for the mobile communication terminal. It is recommended.

Accordingly, a triple-band scheme capable of processing three frequency bands (PCS: 1850 to 1990 MHz, GPS: 1574.42 to 1576.42 MHz, and DCN: 824 to 894 MHz) is used.

1 is a block diagram schematically illustrating the components of a conventional triple band mobile communication terminal 10. As shown in FIG.

Referring to FIG. 1, a conventional triple band mobile communication terminal 10 includes a triplexer 11, a DCN duplexer 12, a PCS duplexer 13, a GPS saw filter 14, and a DCN signal processor. 15, a PCS signal processor 16 and a GPS signal processor 17 are configured.

First, the triplexer 11 filters the DCN / PCS / GPS signals received by the antenna and separates the signals into respective signal bands, and processes the impedance matching due to the bonding of the respective bands to separate the signals. Adjust the impedance so as not to mix.

In addition, the DCN duplexer 12 includes a high band filter and a low band filter, and transmits and receives a DCN signal transmitted from the triplexer 11 or the DCN signal processor 15 (transmission signal: 824 to 849 MHz, Received signal: divided into 869 ~ 894MHz) and transmitted to the DCN signal processor 15 or the antenna.

In addition, the PCS duplexer 13 includes a high band filter and a low band filter, and transmits and receives a PCS signal transmitted from the triplexer 11 or the PCS signal processing unit 16 (transmission signal: 1.85 to 1.91 1., Received signal: 1.93 ~ 1.99㎓) to be transmitted to the PCS signal processor 16 or the antenna.

In addition, the GPS saw filter 14 is a band pass filter (BPF) and filters the GPS signal transmitted from the triplexer 11 and transmits the GPS signal to the GPS signal processor 17.

In general, when the triplexer 11 is provided as a front end module (FEM), the signal received from the antenna is separated into respective bands, and an open point is prevented so that signals from adjacent bands do not flow through impedance matching. Designing the role of controlling the circuit is limited in minimizing the triplexer module size.

In addition, the antenna is implemented as two of a dual-band antenna and a GPS antenna for tuning and transmitting DCN / PCS signal, it is possible to implement a tree band with a single antenna through a triplexer, not SP3T (Single Pole three Throw) Do. However, a conventional triplexer is generally implemented as one chip using 10 or more lumped elements, but has the following problems.

First, the triplex of a conventional triple band mobile communication terminal greatly increases the insertion loss in the entire band due to the insertion of an LC tank circuit, a choke circuit, a phase shift circuit, and the like.

In particular, single components such as a choke circuit or a BAW duplexer in the GPS path stage cause a problem in that the signal is weakened due to high insertion loss characteristics.

Second, as the number of modes increases, the frequency interval between the modes becomes closer, and it is difficult to manufacture a single component filter for filtering various signals simultaneously. In particular, in the GPS mode and the PCS mode, the frequency spacing is about 300 MHz, which makes it difficult to manufacture a triplexer for signal separation. For this reason, a large number of lumped elements are required.

Third, it is difficult to miniaturize the product because it requires a large number of lumped elements.

Fourth, when implementing a triplexer using a large number of lumped elements, there are various problems such as insertion loss due to high frequency and ripple in a passband due to an increase in frequency band.

Fifth, in order to improve reception sensitivity of DCN, PCS, and GPS bands, low insertion loss characteristics should be implemented. In particular, an additional circuit such as an LNA (low noise amplifier) is required to suppress high insertion loss of the GPS stage.

In addition, when the GPS signal is separated by applying the diplexer as well as the active switch, the insertion loss of the GPS terminal increases due to the insertion loss of the diplexer.

Accordingly, there is a need to improve the structure of the conventional triplexer in order to implement a high quality call service and a mobile communication terminal of miniaturization trend.

The present invention minimizes insertion loss by minimizing the use of single components such as triplexers, switch elements, choke circuits, LC tanks, phase shift circuits, etc., and suppresses leakage currents between adjacent circuits to maximize the interference of each frequency band signal. It is maintained as a stable signal, separated, and provides a quintplexer that can be miniaturized when composed of one chip.

Quintplexer according to the present invention includes a first choke circuit for blocking the third signal, a first phase shift network (PSN) circuit for blocking the second signal and a first separator for separating the transmission and reception signal of the first signal, A first signal separator connected to the antenna; A second PSN circuit connected to the antenna and blocking the first signal; A second signal separator connected to the second PSN circuit and including a second choke circuit to block the third signal and a second separator to separate a transmission / reception signal of the second signal; And a third signal separator connected to the second PSN circuit and blocking the second signal to pass a third signal.

Hereinafter, a quintplexer according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram schematically showing the components of the quintplexer 100 according to an embodiment of the present invention.

Referring to FIG. 2, the quintplexer 100 according to an exemplary embodiment of the present invention has a first signal separation unit 110, a second signal separation unit 140, and a third signal separation unit according to a type of a signal to be processed. The first signal separation unit 110 includes a first choke circuit 112, a first phase shift network (PSN) circuit 114, and a first separator 116. The second signal separator 140 includes a second choke circuit 142 and a second separator 144.

The first signal separator 110, the second signal separator 140, the third signal separator 130 and the fourth signal separator 140 process frequency signals of different bands, respectively. In an embodiment, the first signal separator 110 processes a frequency signal of the PCS band (hereinafter referred to as a "PCS signal"), and the second signal separator 140 is a frequency signal of the cellular band. (Hereinafter referred to as a "DCN signal"), and the third signal separation unit 130 processes a frequency signal of the GPS band (hereinafter referred to as "GPS signal").

The antenna 200 receives a frequency signal of a triple band band, that is, a GPS signal, a DCN signal, and a PCS signal, and the signals received through the antenna 200 are branched in parallel to form a first signal of the first signal separator 110. It is transmitted to the first choke circuit 112 and the second PSN circuit 120.

The first choke circuit 112 blocks the GPS signal among the transmitted signals to pass the PCS signal and the DCN signal, and the first PSN circuit 114 blocks the DCN signal among the passed PCS signal and the DCN signal.

The first separator 116 is connected to the PCS Tx processing unit 300 and the PCS Rx processing unit 400, and separates and transmits and receives a transmitted / received signal of the finally transmitted PCS signal, and the PCS received signal is the PCS Rx processing unit 400. The PCS transmission signal is transmitted from the PCS Tx processing unit 300 to the first PSN circuit 114.

In the case of the PCS transmission signal, unlike the reception signal, signals of various frequency bands are not mixed, and thus, the PCS transmission signal is transmitted in the reverse direction of the above-described path and may be transmitted through the antenna 200.

Since the first PSN circuit 114 and the first choke circuit 112 are implemented as passive elements (see FIG. 3), signals may be transmitted in both directions.

Meanwhile, the second PSN circuit 120 blocks the PCS signal among the signals transmitted from the antenna 200 and transfers the DCN signal and the GPS signal to the third signal separator 130 and the fourth signal separator 140. do.

The third signal separation unit 130 is connected to the GPS Rx processing unit 500 and prevents the inflow of the DCN signal among the transmitted DCN signal and the GPS signal, and transmits only the GPS signal to the GPS Rx processing unit 500.

In addition, the second choke circuit 142 of the fourth signal separator 140 blocks the GPS signal among the transmitted DCN signal and the GPS signal and transmits only the DCN signal to the second separator 144.

The second separator 144 is connected to the DCN Tx processing unit 600 and the DCN Rx processing unit 700, and separates and transmits a transmission / reception signal of the DCN signal. The DCN reception signal is transmitted to the DCN Rx processing unit 700 and the DCN The transmission signal is received from the DCN Tx processing unit 600 and transferred to the second choke circuit 142.

Since the DCN transmission signal transmitted to the second choke circuit 142 is not in a state in which signals of various frequency bands are not mixed unlike the reception signal, it passes through the second choke circuit 142 and the second PSN circuit 120. The second choke circuit 142 and the second PSN circuit 120 may also be implemented as passive devices, and thus may transmit signals in both directions.

Hereinafter, the quintplexer 100 according to the embodiment of the present invention will be described in detail by taking the case where each of the above-described components are implemented as an electronic circuit device.

FIG. 3 is a circuit block diagram illustrating a case where a component of the quintplexer 100 is implemented as an element according to an embodiment of the present invention.

Referring to FIG. 3, each component of the quintplexer 100 described with reference to FIG. 2 may be implemented as an electronic circuit device. The first choke circuit 112 of the first signal separation unit 110 may be described. Is provided as an LC tank (hereinafter referred to as "first LC tank"), and the first PSN circuit 114 is provided as a high pass filter (HPF) (hereinafter referred to as "high band filter"). do.

In addition, the first separator 116 is provided as a duplexer (hereinafter, referred to as a "PCS duplexer"), the second PSN circuit 120 is provided as a phase shifter, and the third signal separator 130 is a saw. It may be provided as a filter (hereinafter referred to as "GPS saw filter").

The second choke circuit 142 of the second signal separator 140 is provided as an LC tank (hereinafter referred to as a "second LC tank"), and the second separator 144 is provided as a duplexer (hereinafter, " DCN duplexer ".

First, the first signal separator 110 will be described.

The first LC tank 112 is configured by connecting a capacitor 112a of 5.0pF and an inductor 112b of 1.6nH in parallel and blocking a GPS signal by moving a resonance point.

The high pass filter 114 includes a capacitor 114a and an inductor 114b. The capacitor 114a is connected in series between the first LC tank 112 and the PCS duplexer 116. 114b is connected to the ground terminal by forming a parallel circuit in front of the capacitor 114a.

The high pass filter 114 passes only a relatively high band PCS received signal of the PCS received signal (1.93 GHz to 1.99 GHz) and the DCN received signal (869 MHz to 894 MHz).

As described above, the PCS duplexer 116 separates and transmits the PCS transmission / reception signal in both directions. The PCS duplexer 116 is implemented by applying SAW or BW technology, and a high pass filter. 116a and a low pass filter 116b, and apply a frequency division multiplexing scheme to convert the entire signal (multiple frequency signals mixed simultaneously) into two frequency bands with no overlapping frequency spectrum. Separate.

The high band filter 116a passes a reception signal having a relatively high band among the transmitted PCS signals, and the low band filter 116b passes a transmission signal having a low band.

In the exemplary embodiment of the present invention, the PCS duplexer 116 and the DCN duplexer 144 may be provided as a bulk acoustic wave (BAW) duplexer chip, and the bow duplexer is excellent in blocking the frequency of the adjacent band. .

The BAW duplexer uses a BAW filter technology in which a piezoelectric thin film (A1-N), which causes resonance vibrations in a vertical direction on a silicon substrate, is connected in a double lattice structure over an air gap approximately 2 micrometers high, and transmits an RF signal (TX ) And receive (RX) bands. In addition, the BAW duplexer has better RF signal processing characteristics than the SAW duplexer because it has excellent power resistance and low temperature coefficient (TCF = -18 ppm / K).

As described above, according to the first signal processing unit 110, without using a conventional triplexer or a single pole 3 throw (SP3T), the passive element such as the first LC tank 112 and the high pass filter 114 is used. Since the PCS duplexer 116 is directly connected to the antenna 200, the in-band loss due to the high insertion loss of the bow duplexer can be minimized.

The second PSN circuit 120 shifts the phase to 45 degrees to operate as an open circuit for a frequency of 1.88 kHz, thus preventing the PCS signal from leaking among the signals transmitted through the antenna 200, and the GPS Pass signal and DCN signal.

The passed GPS signal and DCN signal are branched in parallel and transferred to the GPS saw filter 130 and the second LC tank 142. The GPS saw filter 130 is a mechanical signal when an electrical signal is applied to the piezoelectric object at the input terminal. After converting to, the output signal converts mechanical signal back into electrical signal and outputs the set GPS signal and passes DCN signal.

Since the saw filter has a high output impedance, it has an excellent effect of blocking the DCN signal, and is manufactured in a photography method, thereby making it possible to reduce the size and thinness.

That is, the GPS saw filter 130 is designed to have a high VSWR characteristic in the DCN frequency band in order to prevent the DCN signal from being introduced into the GPS signal, and the GPS saw filter 130 thus designed is lost due to band combining. Can be minimized.

The GPS signal 1.575 추출 extracted by the GPS saw filter 130 is transmitted to the GPS Rx processor 500, and the GPS Rx processor 500 generates position information by decoding the filtered GPS signal.

On the other hand, similar to the first LC tank 112 described above, the second LC tank 142 is composed of a parallel circuit of the inductor 142b and the capacitor 142a. The band signal passes mostly without current loss.

The device value of the second LC tank 142 may be determined by the following equation.

For example, since the GPS signal uses a frequency of 1.575 kHz, it is possible to determine the values of the inductor 142b and the capacitor 142a of the second LC tank 142 using the above equation. There are several pairs of satisfying L and C values.

Since f = 1.575 kV, the second LC tank 142 may be configured using, for example, C = 6 pF and L = 1.2 nH.

The DCN duplexer 144 separates and transmits DCN transmission / reception signals in both directions. The DCN duplexer 144 may be implemented by applying SAW or BW technology, and a high pass filter 144a. ) And a low pass filter 144b.

The high band filter 144a passes a reception signal having a relatively high band among the transmitted DCN signals, and the low band filter 144b passes a transmission signal having a low band.

The third signal separation unit 130 may minimize the signal loss that may occur on the signal processing path by processing the signal using only the saw filter (for example, limiting the number of passive elements such as the LC tank as much as possible). .

That is, according to an embodiment of the present invention, by minimizing the factors that can cause the signal loss, such as the path end of the GPS signal and the path end of the PCS signal, it is possible to overcome the limit characteristics of the case where a single element is used to lower the overall circuit A quintplexer with path loss can be implemented.

The DCN Rx processor 700 and the PCS Rx processor 400 may process the DCN received signal and the PCS received signal as digital signals, respectively, and reproduce the multimedia data.

In addition, the DCN Tx processing unit 600 and the PCS Tx processing unit 300 convert the DCN transmission signal and the PCS transmission signal in the digital signal state into the baseband signal and the RF signal in the analog signal state, respectively, and then separate the second signal. Transfer to the unit 140 and the first signal separation unit 110.

4 is a Smith chart illustrating input impedance characteristics of the DCN duplexer 144 according to an embodiment of the present invention.

Referring to FIG. 4, for example, when a load impedance coordinate point of a signal is formed at point A on the Smith chart, this means that the circuit is operated as an open circuit on the signal side, and when the load impedance coordinate point is formed at B point on the Smith chart, Means that the circuit is operated as a short circuit in terms of signal.

When the input impedance of the DCN duplexer 144 is expressed at point C on the Smith chart, the impedance should be matched to point A on the Smith chart because the PCS signal must operate as an open circuit.

Quintplexer 100 according to the present invention is connected to each PCS Tx processing unit 300, PCS Rx processing unit 400, GPS Rx processing unit 500, DCN Tx processing unit 600 and DCN Rx processing unit 700 The port clearly shows the characteristics of the reflection coefficient in the transmission / reception band of the DCN / PCS / GPS signal, which means that the ratio of the transmission to the transmission / reception end of the corresponding band is clear, which means that the relative signal is blocked and the function of passing the signal is clearly performed. .

Although the present invention has been described above with reference to the embodiments, these are only examples and are not intended to limit the present invention, and those skilled in the art to which the present invention pertains may have an abnormality within the scope not departing from the essential characteristics of the present invention. It will be appreciated that various modifications and applications are not illustrated. For example, each component specifically shown in the embodiment of the present invention can be modified. And differences relating to such modifications and applications will have to be construed as being included in the scope of the invention defined in the appended claims.

According to the quintplexer according to the present invention, an RF front-end module is configured to perform a transmission / reception function stably by overcoming the limitations when a single device is used by minimizing insertion loss in each frequency band and reducing overall path loss. You can do it.

In addition, according to the present invention, since the quintplexer can be manufactured using the minimum number of electronic elements, it is possible to realize low cost and small size, and to improve the transmission and reception quality by effectively blocking the interference between adjacent circuits.

Claims (7)

A first choke circuit for blocking the third signal, a first PSN circuit for blocking the second signal, and a first separator for separating the transmission / reception signal of the first signal, the first signal separator being connected to the antenna ; A second PSN circuit connected to the antenna and blocking the first signal; A second signal separator connected to the second PSN circuit and including a second choke circuit to block the third signal and a second separator to separate a transmission / reception signal of the second signal; And And a third signal separator connected to the second PSN circuit and blocking the second signal to pass a third signal. The method of claim 1, wherein the first PSN circuit is Quint multiplexer comprising a band pass filter. The circuit of claim 1, wherein at least one of the first choke circuit and the second choke circuit Quint multiplexer comprising an LC tank. The method of claim 1, wherein the third signal separation unit Quint multiplexer comprising a filter. The method of claim 1, wherein at least one of the first separator and the second separator Quint multiplexer comprising a duplexer. The method of claim 1, wherein the first signal, the second signal and the third signal is A quintplexer, each of which is a PCS signal, a DCN signal, and a GPS signal. The method of claim 1, wherein at least one of the first separator and the second separator A quench multiplexer comprising a high pass filter and a low pass filter.

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