KR20090030449A - Signal processing device - Google Patents

Abstract

A signal processing device is provided to prevent interference between a GPS(Global Positioning System) signal and a PCS(Personal Communication Service) signal or a GPS signal and a DCN(Digital Cellular Network) signal, thereby improving communication quality of a communication terminal. An antenna unit(101) receives the first signal, the second signal and the third signal of different frequency bands. The first signal separating unit(110) separates a transmitting/receiving signal of the first signal. The second signal separating unit(120) separates a transmitting /receiving signal of the second signal. The third signal separating unit(130) separates a received signal of the third signal. The first isolation circuit unit(141) blocks the transmitting signal of the first signal inputted into the third signal separating unit by connecting the first isolation circuit unit between the first signal separating unit and the third signal separating unit.

Description

Signal Processing Unit {SIGNAL PROCESSING DEVICE}

Embodiments relate to a signal processing apparatus.

Currently, mobile communication terminals have a trend of having multiband and multimode communication functions, and therefore, a multiplexer is essentially provided in the RF front end module.

Unlike the A-GPS (Assisted GPS), which used a conventional switch, the S-GPS (Simultaneous GPS) function has been enhanced, and a triplexer or a Quintplexer for S-GPS incorporating these functions has been developed. . The S-GPS is a cellular and a GPS function or a PCS and a GPS function are operated simultaneously, and the GPS is always operated regardless of the call function.

Therefore, in recent years, the quintplexer for S-GPS has improved isolation to prevent a problem that a part of the transmission signal is introduced into the GPS reception filter when the transmission signal is transmitted from the RF signal to the antenna and the GPS reception sensitivity is degraded. Required.

The embodiment provides a signal processing device having excellent isolation characteristics between a transmission signal and a GPS reception signal.

The signal processing apparatus according to the embodiment may include an antenna unit configured to receive first, second and third signals having different frequency bands, a first signal separator configured to separate the transmission / reception signal of the first signal, and the second signal A second signal separator for separating a transmission / reception signal of a signal, a third signal separator for separating a received signal of the third signal, and a connection between the first signal separator and the third signal separator; And a first isolation circuit unit to block a transmission signal of the first signal introduced into the separation unit.

The signal processing apparatus according to the embodiment may include an antenna unit configured to receive first, second and third signals having different frequency bands, a first signal separator configured to separate the transmission / reception signal of the first signal, and the second signal A second signal separator for separating a transmission / reception signal of a signal, a third signal separator for separating a received signal of the third signal, and between the first signal separator, the second signal separator, and the third signal separator And an isolation circuit unit connected to the at least one of a transmission signal of the first signal and a transmission signal of the second signal introduced into the third signal separation unit.

The signal processing apparatus according to the embodiment prevents the interference between the GPS signal and the PCS or the GPS signal and the DCN signal, thereby improving the call quality of the communication terminal and improving the GPS reception rate.

Hereinafter, a signal processing apparatus according to an embodiment will be described in detail with reference to the accompanying drawings. However, one of ordinary skill in the art who understands the spirit of the present invention may easily propose another embodiment by adding, adding, deleting, or modifying elements within the scope of the same spirit, but this also belongs to the scope of the present invention. I will say.

Hereinafter, a signal processing apparatus according to embodiments will be described in detail with reference to the accompanying drawings. Hereinafter, when referred to as "first", "second", and the like, this is not intended to limit the members but to show that the members are divided and have at least two. Thus, when referred to as "first", "second", etc., it is apparent that a plurality of members are provided, and each member may be used selectively or interchangeably. In addition, the size (dimensions) of each component of the accompanying drawings are shown in an enlarged manner to help understanding of the invention, the ratio of the dimensions of each of the illustrated components may be different from the ratio of the actual dimensions. In addition, not all components shown in the drawings are necessarily included or limited to the present invention, and components other than the essential features of the present invention may be added or deleted. In the description of an embodiment according to the present invention, each layer (film), region, pattern or structure is "on / above / over / upper" of the substrate, each layer (film), region, pad or patterns or In the case described as being formed "down / below / under / lower", the meaning is that each layer (film), region, pad, pattern or structure is a direct substrate, each layer (film), region, It may be interpreted as being formed in contact with the pad or patterns, or may be interpreted as another layer (film), another region, another pad, another pattern, or another structure being additionally formed therebetween. Therefore, the meaning should be determined by the technical spirit of the invention.

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 signal processing apparatus are implemented as elements in a terminal according to an embodiment.

1 and 2, a terminal may include an antenna 101, a signal processing device 100 for processing a signal received by or transmitted from the antenna 101, and the signal processing device 100. A first low noise amplifier 171 (LNA), a second low noise amplifier 172, and a first power amplifier 151 connected to the signal processing device 100, respectively; PA) and the second power amplifier 152, the received signal processor 182 connected to the first and second low noise amplifiers 171 and 172, and the first and second power amplifiers 151 and 152. A digital signal processor connected to a connected transmission signal processor 181, the reception signal processor 182, and the transmission signal processor 181 to perform input / output of a baseband signal and to perform digital signal processing according to a communication method used; 190).

The signal processing apparatus 100 may be, for example, a quintplexer.

Hereinafter, the first signal may be a PCS signal. The second signal may be a DCN signal. The third signal may be a GPS signal.

The PCS signal may have a frequency band of 1850 to 1990 MHz. The DCN signal may have a frequency band of 824 to 894 MHz. The GPS signal may have a frequency band of 1574.42 to 1576.42 MHz.

The first signal may include a first transmission signal and a first reception signal.

The second signal may include a second transmission signal and a second reception signal.

The signal processing apparatus 100 may include a band blocker 103 connected to the antenna 101, a first signal splitter 110 connected to the band blocker 103, and a third cable connected to the antenna 101. And a signal separator 130, a band pass part 105 connected to the antenna 101, and a second signal split part 120 connected to the band pass part 105.

When the radio signal is received by the antenna, the received signal is transmitted to the band blocker 103, the third signal separator 130, and the band pass part 105.

The band blocker 103 cuts a signal of a predetermined band from the received signal and transmits the signal to the first signal separator.

The band blocking unit 103 includes a first inductor 161, a second inductor 162, and a first capacitor 166.

The second inductor 162 and the first capacitor 166 are connected in series, and the first inductor 161 is connected in series with the second inductor 162 and the first capacitor 166 connected in series. It is possible to implement a parallel resonant circuit.

A third inductor 163 may be connected in parallel between the band cutout 103 and the first signal separator 110, and the third inductor 163 is grounded. Here, the third inductor 163 serves as an electrostatic discharge (ESD) protection circuit of the first signal separator 110 and the third signal separator 130.

The band cut-off unit 103 is operated as an open circuit for the signal of the third signal frequency band and passes the signals of the first signal and the second signal frequency band without loss.

For example, the frequency signal of the 1.575 GHz band, which is the GPS signal, is blocked, and passes only the PCS signal and the DCN signal.

The combination of the inductor and the capacitor of the band blocking unit 103 may be various.

The first signal separation unit 110 separates the first signal from the signal received from the antenna 101 and passed through the band blocker 103.

The band pass part 105 serves to pass a signal of a predetermined band from the signal received from the antenna 101.

The band pass portion 105 includes a fourth inductor 164 and a second capacitor 167.

The fourth inductor 164 and the second capacitor 167 are connected in series to implement a series resonant circuit.

A fifth inductor 165 may be connected in parallel between the band pass part 105 and the second signal separator 120, and the fifth inductor 165 is grounded. Here, the fifth inductor 165 serves as an electro static discharge (ESD) protection circuit of the second signal separator 120.

The band pass section 105 is operated in an open circuit with respect to the signals of the first signal and the third signal frequency band, and passes the signal of the second signal frequency band without loss.

For example, the frequency signal of the 1.575 GHz band and the PCS signal band of the GPS signal are cut off, and only the DCN signal passes.

The second signal separator 120 separates the second signal from the signal received from the antenna 101 and passed through the band pass section 105.

The third signal separator 130 separates the third signal from the signal received from the antenna 101.

The first signal separator 110 and the second signal separator 120 may be provided as a duplexer, and the third signal separator 130 may be provided as a SAW filter. The duplexer may be implemented by applying SAW or BW (Bulk Acoustic Wave) technology. The duplexer applies a frequency division multiplexing scheme to separate the entire signal (multiple frequency signals mixed simultaneously) into two frequency bands in which the frequency spectrum does not overlap.

The first signal separator 110 includes a first filter 111 and a second filter 112.

The second filter 112 is implemented as a low band pass filter for passing a first transmission signal having a low band, and the first filter 111 is a high band for passing a first received signal having a relatively high band among the transmitted signals. Implemented as a filter.

The second signal separator 120 includes a third filter 121 and a fourth filter 122.

The third filter 121 is implemented as a low pass filter for passing the second transmission signal having a low band, and the fourth filter 122 is a high band for passing a second received signal having a relatively high band among the transmitted signals. Implemented as a filter.

The third signal separator 130 may include a fifth filter 131, and the fifth filter 131 may be implemented as a saw filter. The saw filter passes only the third signal and blocks other signals.

The signal processing apparatus 100 may include a first isolation circuit unit 141 connected in parallel to the first signal separation unit 110 and the third signal separation unit 130, and the second signal separation unit 120. And a second isolation circuit unit 142 connected in parallel to the third signal separation unit 130.

The first isolation circuit 141 is connected in parallel between the first signal separation unit 110 and the first power amplifier 151, and the third signal separation unit 130 and the third low noise amplification unit are connected in parallel. 173 are connected in parallel.

The first isolation circuit unit 141 includes a first coupler 143, a first phase shift device 144, a first resistor 145, and a third capacitor 158.

The first coupler 143 is disposed between the first signal separator 110 and the first phase shifter 144, and the first coupler 143 terminates the first resistor 145. The third capacitor 158 is disposed between the first phase shifter 144 and the third signal separator 110.

For example, the first resistor 145 may be a 50Ω resistor. Typically, the four ports of the coupler measure characteristics based on 50Ω resistance, and if the resistance of any one of the four ports of the coupler is changed, the coupling characteristic is changed and the reflection characteristic (VSWR) is deteriorated. The connected resistor may be a 50Ω resistor. However, the resistance value of the first resistor 145 may vary depending on the resistance values of the ports of the coupler.

The first coupler 143 adjusts the magnitude of the first transmission signal introduced from the first transmission terminal PCS Tx, and the first phase shifter 144 performs the third reception terminal GPS Rx. A 180 degree phase difference with the 1st transmission signal which flowed in is converted.

As a result, a first transmission signal transmitted from the first transmission terminal PCS Tx is transmitted to the antenna 101 through the first signal separation unit 110, and a part of the first transmission signal is transmitted to the third signal separation unit. The first isolation circuit unit 141 generates a signal having the same magnitude and opposite phase as that of the introduced first transmission signal when the first isolation circuit unit 141 flows into the third reception terminal. Can be removed from (GPS Rx).

The first phase shifter 144 may include a resonant circuit or may include a microstrip line.

The second isolation circuit unit 142 is connected in parallel between the second signal separation unit 120 and the second power amplifier 152, and the third signal separation unit 130 and the third low noise amplification unit 173 are connected in parallel.

The second isolation circuit unit 142 includes a second coupler 148, a second phase shifter 147, a second resistor 149, and a fourth capacitor 146.

The second coupler 148 is disposed between the second signal separator 120 and the second phase shifter 147, and the second coupler 148 connects the second resistor 149 to the termination. The fourth capacitor 146 is disposed between the second phase shifter 147 and the third signal separator 130.

The second coupler 148 adjusts the magnitude of the second transmission signal introduced from the second transmission terminal DCN Tx, and the second phase conversion device 147 performs the third reception terminal GPS Rx. The first transmission signal is introduced into the 180 degree phase difference is converted.

As a result, the second transmission signal transmitted from the second transmission terminal DCN Tx is transmitted to the antenna 101 through the second signal separation unit 120, and a part of the second transmission signal is transmitted to the third signal separation unit. The second isolation circuit unit 142 generates a signal having the same magnitude as that of the introduced second transmission signal and has a phase opposite to that of the introduced second transmission signal when the second isolation circuit unit 142 enters a third receiver. Can be removed from (GPS Rx).

The second phase shifter 147 may include at least one of a resonance circuit and a microstrip line.

The first isolation circuit unit 141 is a part of the first transmission signal transmitted when the portion of the first transmission signal transmitted from the first power amplifier 151 flows through the third signal separation unit 130. By canceling a part, the reception sensitivity of the third signal, for example, the GPS signal, received through the third signal separation unit 130 is improved.

The second isolation circuit unit 142 may be configured to determine the portion of the second transmission signal that is introduced when a portion of the second transmission signal transmitted from the second power amplifier 152 flows through the third signal separation unit 130. By canceling a part, the reception sensitivity of the third signal, for example, the GPS signal, received through the third signal separation unit 130 is improved.

In particular, when the first signal transmission / reception function and the GPS function or the second signal transmission / reception function and the GPS function are operated at the same time, the GPS is always operated irrespective of the call function. ) And the second isolation circuit unit 142 may improve the isolation between the transmission signal and the GPS reception signal.

3 and 4 are examples of the phase shifting apparatus of the signal processing apparatus according to the embodiment.

As shown in FIG. 3, the first phase shifter 144 may be a resonance circuit.

The resonant circuit may be constituted by a pi (π) or a tee (T) type circuit.

The resonant circuit includes a sixth inductor 195, a fifth capacitor 196 and a sixth capacitor 197 connected in parallel to both ends of the sixth inductor 195.

As shown in FIG. 4, the first phase shifter 144 may be implemented as a micro strip line 198.

The microstrip line 198 has an impedance determined by the dielectric constant of the dielectric, the thickness of the dielectric, and the line width of the line, and the phase is determined by the length of the line.

FIG. 5 is a circuit block diagram illustrating a case where components of a signal processing apparatus according to another embodiment are implemented as elements.

The signal processing apparatus 200 illustrated in FIG. 5 is denoted by the same reference numerals for the same parts as the signal processing apparatus 100 described with reference to FIG. 2, and description thereof will be omitted.

Referring to FIG. 5, the isolation circuit unit 241 is connected in parallel between the first signal separation unit 110 and the first transmission terminal PCS Tx to between the third signal separation unit 130 and the third reception terminal GPS Rx. Is connected in parallel. In addition, the isolation circuit unit 241 is connected in parallel between the second signal separation unit 120 and the second transmission terminal DCN Tx.

The isolation circuit 241 may include a first coupler 242, a second coupler 246, a first phase shifter 243, a second phase shifter 245, a seventh capacitor 244, and a third resistor ( 247).

The first coupler 242 is disposed between the first signal separator 110 and the first phase shifter 243, and the first phase shifter 243 is a seventh capacitor 244. The seventh capacitor 244 is connected between the third signal separation unit 130 and the third receiving terminal GPS Rx.

The second coupler 246 is disposed between the second signal separator 120 and the second phase shifter 245, and the second phase shifter 245 is connected to the first coupler 242. Connected.

The second coupler 246 is connected to the third resistor 247 and grounded.

The isolation circuit unit 241 of the signal processing device 200 configured as described above not only prevents the first transmission signal from flowing into the third receiving terminal GPS Rx but also the second transmission signal is transmitted to the third. It may also be prevented from entering the receiving end (GPS Rx). The isolation circuit unit 241 may simultaneously block the first transmission signal and the second transmission signal from flowing into the third receiving terminal GPS Rx.

In the signal processing apparatus 200 configured as described above, the second transmission signal transmitted from the second transmission terminal DCN Tx is transmitted to the antenna 101 through the second signal separation unit 120 and the first transmission signal. When a part of the second transmission signal is introduced into the third signal separation unit 130, the second coupler 246 of the isolation circuit unit 241 is the second transmission signal introduced from the second transmission terminal DCN Tx. The first and second phase shifters 243 and 245 convert the second transmission signal introduced into the third receiver GPS Rx to be 180 degrees out of phase with each other. The second transmission signal can be canceled out.

The first transmission signal transmitted from the first transmission terminal PCS Tx is transmitted to the antenna 101 through the first signal separation unit 110, and a part of the first transmission signal is transmitted to the third signal separation unit ( When it enters 130, the isolation circuit unit 241 generates a signal having the same magnitude and opposite phase as that of the introduced first transmission signal, thereby transferring a portion of the first transmission signal to a third receiver (GPS Rx). Can be removed from

Therefore, the signal processing apparatus 200 may improve the isolation from the GPS received signal for both the DCN or PCS transmission signal by using one isolation circuit unit 241. In addition, the number of device components can be reduced and space utilization is excellent.

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.

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

2 is a diagram illustrating a case in which a component of a signal processing device is implemented as an element in a terminal according to an embodiment;

3 and 4 are examples of the phase shifting apparatus of the signal processing apparatus according to the embodiment.

5 is a circuit block diagram illustrating a case where components of a signal processing apparatus according to another embodiment are implemented as elements.

Claims (9)

An antenna unit configured to receive the first signal, the second signal, and the third signal, which are different frequency bands; A first signal separation unit separating the transmission / reception signal of the first signal; A second signal separation unit separating the transmission / reception signal of the second signal; A third signal separator for separating the received signal of the third signal; And And a first isolation circuit unit connected between the first signal separator and the third signal separator to block a transmission signal of the first signal introduced into the third signal separator. The method of claim 1, And a second isolation circuit unit connected in parallel with the second signal separation unit and the third signal separation unit to block a transmission signal of the second signal introduced into the third signal separation unit. The method of claim 1, The first isolation circuit unit, At least one coupler for adjusting a magnitude of a transmission signal of the introduced first signal; And And a phase shifting device connected to the coupler and converting a phase of a transmission signal of the first incoming signal. The method of claim 2, The second isolation circuit unit, At least one coupler for adjusting a magnitude of a transmission signal of the introduced second signal; And And a phase shifting device connected to the coupler and converting a phase of a transmission signal of the introduced second signal. The method according to claim 3 or 4, And said phase shifting device comprises at least one of a resonant circuit and a microstrip line. The method according to claim 3 or 4, The phase shifting device includes a pi (π) or tee (T) type circuit including a capacitor. An antenna unit configured to receive the first signal, the second signal, and the third signal, which are different frequency bands; A first signal separation unit separating the transmission / reception signal of the first signal; A second signal separation unit separating the transmission / reception signal of the second signal; A third signal separator for separating the received signal of the third signal; And At least one of a transmission signal of the first signal and a transmission signal of the second signal which are connected between the first signal separation unit, the second signal separation unit, and the third signal separation unit and introduced into the third signal separation unit; Signal processing device comprising an isolation circuit to block the. The method of claim 7, wherein The isolation circuit unit may include a first coupler for adjusting a magnitude of a transmission signal of the introduced first signal; A first phase shifter disposed between the first coupler and the third signal splitter and converting a phase of a transmission signal of the first or second signal introduced; A second phase shifting device connected to the first coupler and converting a phase of a transmission signal of the introduced second signal; And a second coupler disposed between the second phase shifter and the second signal splitter and configured to adjust a magnitude of a transmission signal of the introduced second signal. The method of claim 8, And said first and second phase shifting devices comprise at least one of a resonant circuit and a microstrip line.

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