KR100901617B1 - Signal processing apparatus and terminal unit having the same - Google Patents

Abstract

Embodiments relate to a signal processing device and a terminal having the same. In one embodiment, a signal processing device includes a diplexer for separating a first signal, a second signal, and a third signal, a first signal separator connected to the diplexer and separating a transmission / reception signal of the first signal; A first line connected to the diplexer to pass the second signal, a second line connected to the first line in parallel to pass the third signal, and connected to the first line to transmit and receive the second signal A second signal separation unit for separating a signal, a third signal separation unit connected to the second line to separate a received signal of the third signal, and a first signal connected in parallel between the first line and the second signal separation unit And a second switch connected in parallel between the second line and the third signal separator.

Terminal, switch

Description

SIGNAL PROCESSING APPARATUS AND TERMINAL UNIT HAVING THE SAME}

1 is a block diagram showing a terminal according to an embodiment;

2 is a diagram illustrating a case where a component of a terminal is implemented as an element according to an embodiment;

<Description of Signs of Major Parts of Drawings>

10 terminal 100 signal processing device

101: antenna 103: diplexer

110: first signal separator 111: first filter

112: second filter 120: second signal separation unit

121: third filter 122: fourth filter

130: third signal separation unit 131: band pass filter

140: reception signal processing unit 150: transmission signal processing unit

151: first power amplifier 152: second power amplifier

161: first track 162: second track

165: first switch 166: second switch

171: First low noise amplifier 172: Second low noise amplifier

173: third low noise amplifier 180: digital signal processor

Embodiments relate to a signal processing device and a terminal having the same.

At present, the communication terminal provides a GPS (Global Position Service) function by default. For example, the FCC's E911 recommends that the mobile terminal be equipped with a wireless location, that is, a location tracking function through a GPS satellite, to enable the location tracking of the communication terminal. .

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.

As such, as the number of modes increases, frequency intervals between modes become closer, and there is a difficulty in manufacturing 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 tri-plexer for signal separation. Implemented using excellent series switching elements.

In the case of implementing a triplexer using a conventional switch element, since a switch is connected in series to a signal transmission path, direct insertion loss of the switch itself occurs. In terms of the reception path, the additional insertion loss deteriorates reception sensitivity by increasing the noise figure, and in terms of the transmission path, there is a problem of lowering transmission power and eventually increasing power consumption of the terminal.

The embodiment provides a signal processing apparatus capable of minimizing insertion loss.

The embodiment provides a terminal with improved call quality.

The signal processing apparatus according to the embodiment includes a diplexer separating the first signal, the second signal, and the third signal;

A first signal separator connected to the diplexer to separate a transmission / reception signal of the first signal;

A first line connected to the diplexer and configured to pass the second signal,

A second line connected in parallel with the first line to pass the third signal;

A second signal separator connected to the first line to separate a transmission / reception signal of the second signal;

A third signal separator connected to the second line to separate the received signal of the third signal;

A first switch connected in parallel between the first line and the second signal separator;

And a second switch connected in parallel between the second line and the third signal separator.

The terminal according to the embodiment, the antenna for transmitting and receiving the first signal, the second signal and the third signal,

A diplexer connected to the antenna and separated into the first signal, the second signal, and a third signal,

A first signal separator connected to the diplexer to separate a transmission / reception signal of the first signal;

A first line connected to the diplexer and configured to pass the second signal,

A second line connected in parallel with the first line to pass the third signal;

A second signal separator connected to the first line to separate a transmission / reception signal of the second signal;

A third signal separator connected to the second line to separate the received signal of the third signal;

A first switch connected in parallel between the first line and the second signal separator;

A second switch connected in parallel between the second line and the third signal separator;

A first signal low noise amplifier, a second low noise amplifier, and a third low noise amplifier to minimize and amplify the noise of the received signal from the first signal separator, the second signal separator, and the third signal separator, respectively;

A reception signal processor for receiving a reception signal from the first to third low noise amplifiers;

A first power amplifier and a second power amplifier for amplifying and transmitting a transmission signal to the first signal separator and the second signal separator, respectively;

A transmission signal processor connected to the first and second power amplifiers to transmit a transmission signal;

And a digital signal processor connected to the received signal processor and the transmit signal processor to process digital signals and to supply control voltages to the first switch and the second switch.

Hereinafter, a signal processing apparatus and a terminal according to an embodiment will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a terminal according to an embodiment, and FIG. 2 is a diagram illustrating a case where components of a terminal according to the embodiment are implemented as elements.

As shown in FIGS. 1 and 2, the communication terminal 10 includes an antenna 101, a signal processing apparatus 100 for processing a signal received by or transmitted from the antenna 101, and A first low noise amplifier 171 (LNA) and a second low noise amplifier 172 connected to the signal processing device 100 and a first power amplifier connected to the signal processing device 100, respectively. 151 (Power Amplifier, PA) and the second power amplifier 152, the received signal processor 140 and the first and second power amplifiers connected to the first and second low noise amplifiers (171, 172) And a transmission signal processing unit 150 connected to the 151 and 152.

The signal processing apparatus 100 may include a diplexer 103 connected to the antenna 101, a first signal separation unit 110 connected to the diplexer 103, and a second coupling device connected to the diplexer 103. The first line 161 and the second line 162, the second signal separation unit 120 connected to the first line 161, the third signal separation unit 130 connected to the second line 162 and the A first switch 165 connected in parallel between the first line 161 and the second signal separator 120, and a second connected in parallel between the second line 162 and the third signal separator 130. Switch 166.

A first power amplifier 151 is disposed between the first signal separation unit 110 and the transmission signal processing unit 150 to amplify the power of the first transmission signal received from the transmission signal processing unit 150. Transfer to the first signal separation unit 110.

The first signal separator 110 may be a first signal filter.

A second power amplifier 152 is disposed between the second signal separation unit 120 and the transmission signal processing unit 150 to amplify the power of the second transmission signal received from the transmission signal processing unit 150 so as to amplify the power. Transfer to the second signal separation unit 120.

The second signal separator 120 may be a second signal filter.

A first low noise amplifier 171 is disposed between the first signal separator 110 and the received signal processor 140 to remove noise of the first received signal received from the first signal separator 110. Minimize and amplify and transfer the amplified first received signal to the received signal processor 140.

A second low noise amplifier 172 is disposed between the second signal separator 120 and the received signal processor 140 to minimize noise of the second received signal received from the second signal separator 120. By amplifying and transmitting the amplified second received signal to the received signal processor 140.

A third low noise amplifier 173 is disposed between the third signal separator 130 and the received signal processor 140 to minimize noise of the third received signal received from the third signal separator 130. By amplifying and transmitting the amplified third received signal to the received signal processor 140.

The terminal 10 includes the received signal processor 140, the transmit signal processor 150, and a digital signal processor 180. The digital signal processing unit 180 is connected to the reception signal processing unit 140 and the transmission signal processing unit 150 to perform input / output of a baseband signal and is responsible for digital signal processing according to a communication method used. It is connected to and controls the switch 165 and the second switch 166.

The first signal may be a frequency signal (DCN signal) of a digital cellular network (DCN) band. For example, the first signal may be a signal in the frequency band 824-894 MHz.

The second signal may be a frequency signal (PCS signal) in a personal communications service (PCS) band. For example, the second signal may be a signal in a frequency band of 1850 to 1990 MHz.

The third signal may be a frequency signal (GPS signal) of a global positioning system (GPS) band. The third signal may be a signal in the frequency band 1574.42 to 1576.42 MHz.

The diplexer 103 includes a low band pass filter 103a and a high band pass filter 103b. The low pass filter 103a passes the first signal in a relatively low band and blocks the second and third signals in a high band. The high pass filter 103b passes the second signal and the third signal which are relatively high band and blocks the first signal which is low band.

For example, the first signal separator 110 may be a duplexer including two band pass filters (BPFs). The first signal separator 110 may separate and transmit the transmitted first signal into a first received signal and a first transmitted signal. The first signal separator 110 may include a first filter 111 for filtering the first received signal from the first signal and a second filter 112 for filtering the first transmitted signal. have.

The first signal separator 110 may receive a first received signal from the diplexer 103 and transmit the first received signal to the first low noise amplifier 171. The first signal separator 110 may receive a first transmission signal from the first power amplifier 151 and transmit the first signal to the diplexer 103.

For example, the second signal separator 120 may be a duplexer including two band pass filters. The second signal separator 120 may separate the transmitted second signal into a second received signal and a second transmitted signal and transmit the divided signal. The second signal separator 120 may include a third filter 121 for filtering the second received signal from the second signal and a fourth filter 122 for filtering the second transmitted signal. have.

The second signal separator 120 may receive a second received signal from the diplexer 103 and transmit the second received signal to the second low noise amplifier 172. The second signal separator 120 may receive the second transmission signal from the second power amplifier 152 and transmit the second signal to the diplexer 103.

The third signal separator 130 may be a band pass filter 131, and may be, for example, a SAW filter. The saw filter filters the third signal transmitted from the diplexer 103 and transmits the filtered third signal to the third low noise amplifier 173.

The diplexer 103 filters the signal received from the antenna 101 into a signal band of a first signal and a signal band of a second signal and a third signal, so that the first signal is the first signal. The separation unit 11 transmits the second signal and the third signal to another path.

The second signal and the third signal transmitted through the other path are controlled by the first line 161 or the second line according to the control operation of the first switch 165 and the second switch 166 at the node A. 162). The first line 161 and the second line 162 are connected in parallel at the A node. The first switch 165 and the second signal separation unit 120 are connected in parallel at a node B which is an end of the first line 161. The second switch 166 and the third signal separation unit 130 are connected in parallel at a node C which is an end of the second line 162.

The first switch 165 and the second switch 166 may be opened or shorted by a control voltage applied from the digital signal processor 180.

A case where the control voltage is applied is called '1' and a case where the control voltage is not applied is called '0'. The control voltage applied to the first switch 165 is referred to as V1 and the control voltage applied to the second switch 166 is referred to as V2.

Control voltages V1 and V2 applied to the first switch 165 and the second switch 166 may use a combination of (1, 0) and (0, 1).

For example, when control voltages 1 and 0 are applied to the first switch 165 and the second switch 166, the first switch 165 is shorted and the second switch 166 is open. do. Since the first switch 165 is connected to ground, the first switch 165 is open to the second signal at the A node. In addition, the second switch 166 is opened so that a third signal is transmitted to the third signal separator 130 through the second transmission line 162. Therefore, in order to selectively transmit and receive the third signal, the control voltages 1 and 0 may be applied to the first switch 165 and the second switch 166.

For example, when control voltages (0, 1) are applied to the first switch 165 and the second switch 166, the first switch 165 is opened, and the second switch 166 is short-circuited. do. The first switch 165 is opened so that the second signal is transmitted to the second signal separator 120 through the first line 162. Since the second switch 166 is short-circuited and grounded, the second switch 166 is open to the third signal at the node A. Therefore, in order to selectively transmit and receive the second signal, control voltages 0 and 1 are applied to the first switch 165 and the second switch 166.

As described above, short-circuits and openings may be adjusted for signals having different frequency bands at the node A using control voltages applied to the first switch 165 and the second switch 166. Therefore, in the embodiment, since the switching elements are connected in parallel to the signal transmission path without connecting the switching elements in series to the actual signal transmission path of the high frequency front end, there is no insertion loss occurring while passing through the switch itself. The insertion loss of 100 can be reduced. Therefore, the reception sensitivity of the entire system of the terminal can be improved, and power consumption can be reduced even during signal transmission.

As described above, the digital signal processor 180 adjusts the voltage applied to the first switch 165 and the second switch 166.

For example, when a second signal is received from the antenna 101, the control voltages 0 and 1 are applied to the first switch 165 and the second switch 166 to be received from the antenna 101. The second signal may be transmitted to the second signal separator 120 without loss.

For example, when a third signal is received from the antenna 101, the control voltages 1 and 0 are applied to the first switch 165 and the second switch 166 to be received from the antenna 101. The third signal may be transmitted to the third signal separator 130 without loss.

The first line 161 and the second line 162 serve to separate the second signal and the third signal.

When the first switch 165 is short-circuited, the first line 161 opens a point corresponding to a quarter wavelength of the third signal from the node C, which is the end of the second line 162, and the first line 161 is open. When the first switch 165 is opened, a point corresponding to a quarter wavelength of the second signal is shorted from the B node which is the end of the first line 161.

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When the second switch 166 is short-circuited, the second line 162 is opened at a point corresponding to the quarter wavelength of the second signal from the node B which is the end of the first line 161, and the second line 162 is opened. When the second switch 166 is open, a point corresponding to a quarter wavelength of the third signal is shorted from the node C, which is the end of the second line 162.

The length of the first line 161 and the second line 162 may be obtained as follows.

----- 식

----- expression

The dielectric constant may vary depending on the type of substrate used, but assume that the dielectric constant of the substrate is 5.6.

In case of the second signal, if the frequency is 1900 MHz,

Wavelength (λ) = 3 × 10 ⁸ / (1900 × 10 ⁶ × √ (5.6))

= 66.7 mm

 Therefore, the length of the first line 161 is designed to about 16.7mm corresponding to 1/4 wavelength length for 1900MHz.

In the case of the third signal, when the frequency is 1575 MHz, the length of the second line 162 is about 20 mm when calculated using the above equation.

The embodiment of the first line 161 and the second line 162, such as the first switch 165 and the second switch 166 without using the series switch elements in the signal processing device 100 By using an input parallel switch, the input impedance can be adjusted to improve the insertion loss of direct signal lines.

In addition, the signal processing apparatus 100 according to the embodiment may use a low loss low temperature co-fired ceramic (LTCC) substrate to substrate not only the diplexer 103 but also the first and second transmission lines having a relatively long length. Since it can be integrated in the inner layer, it is possible to manufacture small components and a minimum number of components, thereby realizing low cost and miniaturization of the terminal 10.

Although described above with reference to the embodiments, which are merely examples and are not intended to limit the present invention. Those skilled in the art to which the present invention pertains are not exemplified above without departing from the essential characteristics of the present invention. It will be appreciated that many variations and applications are possible. 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.

The signal processing apparatus according to the embodiment can reduce power consumption during transmission by reducing the overall path loss, and can improve the sensitivity during reception.

In addition, the signal processing apparatus according to the embodiment can be manufactured using small elements and a minimum number of components, thereby realizing low cost and miniaturization of the terminal.

Claims (10)

A diplexer for separating the first signal from the second signal and the third signal; A first signal separator connected to the diplexer to separate a transmission / reception signal of the first signal; A first line connected to the diplexer and configured to pass the second signal; A second line connected in parallel with the first line to pass the third signal; A second signal separator connected to the first line to separate a transmission / reception signal of the second signal; A third signal separator connected to the second line to separate the received signal of the third signal; A first switch connected in parallel between the first line and the second signal separator and opened to transmit and receive the second signal; And And a second switch connected in parallel between the second line and the third signal separator, the second switch being opened to transmit and receive the third signal. The method of claim 1, Receiving a first control voltage to transmit and receive the second signal, the first switch is opened by the received first control voltage, and the second switch is shorted to ground, And receiving a second control voltage to transmit and receive the third signal, wherein the second switch is opened by the received second control voltage, and the first switch is shorted to ground. The method of claim 1, When the first switch is opened and the second switch is shorted, the received signal of the second signal is transmitted to the second signal separator through the first line, the second switch is opened, and the first switch is shorted. And the third signal is received by the third signal separator through the second line. The method of claim 2 or 3, And the second line is longer than the first line. The method according to claim 2 or 3, The first line and the second line is implemented as a microstrip line, And the second line is longer than the first line. The method according to claim 2 or 3, Wherein the first signal band frequency is a DCN band frequency, the second signal band frequency is a PCS band frequency, and the third signal band frequency is a GPS band frequency. The method according to claim 2 or 3, The diplexer, A low pass filter separating the first signal; And A high pass filter separating the second signal and the third signal, And the first to third signal separators include at least one of a band pass filter and a saw filter. An antenna for transmitting and receiving a first signal, a second signal, and a third signal; A diplexer connected to the antenna to separate the first signal from the second signal and a third signal; A first signal separator connected to the diplexer to separate a transmission / reception signal of the first signal; A first line connected to the diplexer and configured to pass the second signal; A second line connected in parallel with the first line to pass the third signal; A second signal separator connected to the first line to separate a transmission / reception signal of the second signal; A third signal separator connected to the second line to separate the received signal of the third signal; A first switch connected in parallel between the first line and the second signal separator and opened to transmit and receive the second signal; A second switch connected in parallel between the second line and the third signal separator and opened to transmit and receive the third signal; A first signal low noise amplifier, a second low noise amplifier, and a third low noise amplifier for minimizing and amplifying noise of the received signal from the first signal separator, the second signal separator, and the third signal separator; A reception signal processor configured to receive reception signals from the first to third low noise amplifiers; A first power amplifier and a second power amplifier for amplifying and transmitting a transmission signal to the first signal separator and the second signal separator, respectively; A transmission signal processor connected to the first and second power amplifiers to transmit a transmission signal; And A digital signal processing unit connected to the reception signal processing unit and the transmission signal processing unit to process a digital signal and supply a control voltage to the first switch or the second switch to transmit and receive the second signal or the third signal. Terminal. The method of claim 8, The digital signal processor controls the opening of the first switch and the short circuit of the second switch to transmit and receive the second signal, and the short circuit of the first switch and the short circuit of the second switch to transmit and receive the third signal. Terminal for controlling the opening. The method of claim 8, When the first switch is open and the second switch is shorted, the received signal of the second signal is received by the second signal separator through the first line, the second switch is opened, and the first switch is shorted. And the third signal is received by the third signal separator through the second line.

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