JP2011061355A - Multiband-comaptible high-frequency power monitoring circuit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an economical multiband-compatible high-frequency power monitoring circuit which uses a common circuit board, and does not impair a monitoring function even if a frequency band to be used is applied selectively. <P>SOLUTION: A communication apparatus is composed by use of the common circuit board, and can be provided with N (N is an integer of 2 or more) band circuits which include power amplifiers and isolators with outputs of the power amplifiers input thereto, and which operate for each band. Among n band circuits, the first to Mth (M is equal to N, or a positive integer smaller than N) band circuits are selected on which component elements are actually mounted, an end of each of the first to Mth capacitors is connected to an output of each of the power amplifiers of the first to Mth band circuits on which mount the component elements are mounted, and the other end of each of the first to Mth capacitors is connected between a terminator and a power detection device, in the multiband-compatible high-frequency power monitoring circuit. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a high-frequency power monitor circuit, and more particularly to a multi-band compatible high-frequency power monitor circuit applicable to multiple bands.

  In a wireless communication device represented by a mobile phone or the like, a signal is amplified and transmitted by a high frequency amplifier, and the power is monitored by a high frequency power monitor circuit and fed back to the amplifier so that the transmission power is controlled to be constant. Yes. As these high-frequency power monitor circuits, high-frequency power monitor circuits that support multiple bands are used so as to be compatible with a wide band.

  FIG. 6 shows a circuit block in which a generally used multi-band high-frequency power monitor circuit is used in a transmission / reception unit of a mobile phone terminal device. FIG. 6 shows an example in which three band circuits are provided so that three frequency bands from band 1 to 3 can be supported. In the present invention, three bands are described as an example. However, the present invention is not particularly limited to these, and the number of bands can be arbitrarily set. Further, for easy understanding, the elements constituting each band circuit are represented by corresponding the last digit of the code to 1 to 3.

  6 includes a wireless communication antenna (ANT) 10, a high frequency changeover switch (ANTSW) 20, and a distributor (DIV) 30. The band circuit 1 operating in the frequency band 1 includes a duplexer (DUP) 111, a radio unit (TRX) 121, a power amplifier (PA) 131, a coupler (CUP) 141, a terminator (T) 161, and an isolator (ISO) 171. Consists of The band circuit 2 operating in the frequency band 2 includes a duplexer (DUP) 112, a radio unit (TRX) 122, a power amplifier (PA) 132, a coupler (CUP) 142, a terminator (T) 162, and an isolator (ISO) 172. Consists of The band circuit 3 operating in the frequency band 3 includes a duplexer (DUP) 113, a radio unit (TRX) 123, a power amplifier (PA) 133, a coupler (CUP) 143, a terminator (T) 163, and an isolator (ISO) 173. Consists of

  The high frequency changeover switch (ANTSW) 20 is a switch for switching and connecting between the antenna (ANT) 10 and the three duplexers (DUP) 111, 112, and 113. At the time of reception, a high-frequency signal from the antenna is sent from terminals RF1, RF2, and RF3 to input / output common terminals of three duplexers (DUP) 111, 112, and 113, respectively. At the time of transmission, conversely, a high-frequency signal is sent from the input / output shared terminals of the duplexers (DUP) 111, 112, 113 to the terminals RF1, RF2, RF3 of the high-frequency switch (ANTSW) 20, and further, the high-frequency switch (ANTSW) 20 To the antenna (ANT) 10. As shown in the figure, transmission / reception is shared between the antenna (ANT) 10 and the high-frequency switching switch (ANTSW) 20 and between the high-frequency switching switch (ANTSW) 20 and the duplexer (DUP).

  Hereinafter, the operation of the band circuit will be described, but the operations of the three band circuits 1 to 3 that operate in the frequency bands 1 to 3 are the same for both transmission and reception, and only the frequency bands to be operated are different. At the time of reception, a high frequency signal from the high frequency changeover switch (ANTSW) 20 is transmitted from the reception output terminal of the duplexer (DUP) 111 to the radio unit (TRX) 121 in the band circuit 1. In the band circuit 2, the signal is transmitted from the reception output terminal RX 2 of the duplexer (DUP) 112 to the radio unit (TRX) 122. Further, in the band circuit 3, the signal is transmitted from the reception output terminal RX 3 of the duplexer (DUP) 113 to the radio unit (TRX) 123. Radio units (TRX) 111, 112, and 113 process high-frequency signals to be transmitted and received, respectively.

  At the time of transmission, a signal from the radio unit (TRX) 121 is transmitted via the power amplifier (PA) 131, the coupler (CUP) 141, and the isolator (ISO) 171 to the transmission input terminal (TX1) of the duplexer (DUP) 111. Is input. Further, the signal is transmitted from the duplexer (DUP) 111 via the high frequency changeover switch (ANTSW) 20 and the antenna (ANT) 10. The signal from the radio unit (TRX) 122 is sent to the transmission input terminal (TX2) of the duplexer (DUP) 112 via the power amplifier (PA) 132, the coupler (CUP) 142, and the isolator (ISO) 172. Entered. Further, the signal is transmitted from the duplexer (DUP) 112 via the high frequency changeover switch (ANTSW) 20 and the antenna (ANT) 10. Similarly, a signal from the radio unit (TRX) 123 is transmitted via a power amplifier (PA) 133, a coupler (CUP) 143, and an isolator (ISO) 173 to a transmission input terminal (TX3) of the duplexer (DUP) 113. Is input. Further, the signal is transmitted from the duplexer (DUP) 113 via the high frequency changeover switch (ANTSW) 20 and the antenna (ANT) 10.

  Each coupler (CUP) 141, 142, 143 includes a termination terminal and a monitor terminal. The terminal terminal of the coupler (CUP) 141 is connected to the terminator (T) 161, and the monitor terminal is connected to one input terminal of the distributor 30. The terminal terminal of the coupler (CUP) 142 is connected to the terminator (T) 162, and the monitor terminal is connected to the other input terminal of the distributor 30. The terminal of the coupler (CUP) 143 is connected to the terminator (T) 163, and the monitor terminal is connected to another input terminal of the distributor 30. The output terminal of the distributor (DIV) 30 is connected to the power detector. Here, the coupler (CUP), the terminator (T), and the divider (DIV) constitute a high frequency power monitor circuit.

  FIGS. 8 and 9 show cases where only the band 1 and the band 3 are selected by using, for example, a circuit board in common in this multi-band compatible wireless communication apparatus. In FIG. 8, in the band circuit 2, the duplexer (DUP) 112, the wireless unit 122, the power amplifier (PA) 132, and the isolator (ISO) 172 are removed, and the coupler (CUP) 142 and the terminator (T) 162 are mounted. ing. In the following, in the circuit diagram, mounted components are illustrated by solid lines, and removed and not mounted components are illustrated by broken lines. On the other hand, in FIG. 9, the band circuit 2 includes a coupler (CUP) 142 and a terminator (T) 162, and includes a duplexer (DUP) 112, a radio unit 122, a power amplifier (PA) 132, and an isolator (ISO) 172. Removed.

  Since band 2 is not required as shown in FIG. 9, all the components related to band circuit 2 are not mounted. However, if the coupler (CUP) 142 and the terminator (T) 162 are removed, one terminal of the input of the distributor (DIV) 30 is opened at the monitor terminal of the coupler (CUP) 142, and the distributor (DIV) 30 Normal operation will be impaired. Therefore, even if the band 2 is unnecessary, it is not economical because the coupler (CUP) 142 and the terminator (T) 162 cannot be removed as shown in FIG. Furthermore, if the coupling coefficient of the coupler (CUP) 142 is large, even if the coupler (CUP) 142 and the terminator (T) 162 are mounted as shown in FIG. 8, there is a possibility that mismatch occurs in the distributor (DIV) 30. It may remain.

  As described above, even when the number of bands to be used is small in a multiband-compatible wireless communication device, it is necessary to mount components (for example, couplers and terminators) of a high-frequency power monitor circuit in an unused band. In order to make the mounting element economical, a circuit dedicated to two bands and a dedicated circuit board are required, which is uneconomical.

  Recently, the circuit shown in FIG. 7, which is an improvement of the multi-band high-frequency power monitor circuit shown in FIG. 6, has been used. In FIG. 7, compared with FIG. 6, the number of terminators is reduced by cascade-connecting a plurality of couplers, and a distributor is unnecessary. In the multi-band compatible high-frequency power monitor circuit of FIG. 7, for example, the case where only the band 1 and the band 3 are selected using a circuit board in common is shown in FIGS. In FIG. 10, the duplexer (DUP) 112, the radio unit 122, the power amplifier (PA) 132, and the isolator (ISO) 172 of the band circuit 2 are removed, and the coupler (CUP) 142 is mounted. On the other hand, in FIG. 11, all of the duplexer (DUP) 112, the radio unit 122, the power amplifier (PA) 132, and the isolator (ISO) 172 are removed including the coupler (CUP) 142.

  As shown in FIG. 11, when only the band 1 and the band 3 are used by using the same circuit board, all the components of the band circuit 2 which are unnecessary for economy are not mounted. In this case, however, the circuit is interrupted at the coupler (CUP) and does not function at all. Therefore, as shown in FIG. 10, it is necessary to leave at least the coupler (CUP) 142, which is uneconomical. Furthermore, if the coupling coefficient of the coupler (CUP) 142 is large, even if the coupler (CUP) 142 is left, the high frequency characteristics of the line (distributed constant circuit) from the terminator (T) 160 to the power detector may be abnormal. There is a danger that sex will remain. Therefore, in order to reduce the number of mounting elements and achieve economics, a circuit dedicated to two bands is formed and a dedicated circuit board is required, which is uneconomical.

  Here, the problem in the prior art about the case where the circuit board that can handle the three-band circuit is used in the two-band circuit is illustrated, but the same problem occurs when the circuit board of the three-band circuit is used only in the one-band circuit. As a result, the uneconomical is further redundant. In addition, if the circuit configuration is two or more bands having a plurality of basic circuit configurations, it is similarly uneconomical regardless of the three bands exemplified.

  In the wireless communication apparatus, power is monitored by a high frequency power monitor circuit and fed back to an amplifier so that the power is controlled to be constant. As a prior document regarding these high-frequency power monitor circuits, there is Patent Document 1 below. Patent Document 1 discloses a high-frequency power monitor circuit corresponding to a dual band that extracts a monitor signal using a coupling circuit and a capacitor.

JP 2007-143035 A

  As described above, in the conventional multi-band compatible high-frequency power monitor circuit, when a part of the band circuits among a plurality of band circuits is selected using the same circuit board, if the mounting element is made economical, the monitor Function is impaired. As a result, a dedicated circuit board is required, and it is necessary to design a circuit and a circuit board for each necessary band, which is uneconomical. The above-mentioned Patent Document 1 is a multi-band high-frequency power monitor circuit, and does not intend to select the band, and does not describe any recognition of the problem of the present application.

  The present invention provides an economical multi-band high-frequency power monitoring circuit that does not impair the monitoring function even when a band is selectively applied using a common circuit board.

  According to one aspect of the present invention, N (N is an integer of 2 or more) band circuits each including a power amplifier and an isolator to which an output of the power amplifier is input as a band circuit that operates for each band. A communication device that can be configured using a common circuit board, and the first to Mth (M is equal to N or smaller than N) that actually implements the constituent elements of the N band circuits. And one end of each of the first to Mth capacitors is connected to the output of each of the power amplifiers of the first to Mth band circuits on which the selected components are mounted. The other end of each of the first to Mth capacitors provides a multiband-compatible high-frequency power monitor circuit connected between the terminator and the power detector.

  According to another aspect of the present invention, N (N is an integer of 2 or more) band circuits each including a power amplifier and an isolator to which the output of the power amplifier is input as a band circuit that operates for each band. A communication device that can be configured using a common circuit board, and the first to Mth (M is equal to N or smaller than N) that actually implements the constituent elements of the N band circuits. And one end of each of the first to Mth capacitors is connected to the output of each of the power amplifiers of the first to Mth band circuits on which the selected components are mounted. The other ends of the first to Mth capacitors are connected to the first to Mth terminators and the first to Mth input terminals of the distributor, and the output of the distributor is connected to the power detector. A multiband compatible high frequency power monitor circuit to be connected is obtained.

  According to still another aspect of the present invention, an antenna, a high-frequency switching switch, a duplexer, a radio unit, a power amplifier, and an isolator provided for each band, The multiband-compatible high-frequency power monitor circuit that controls the power output from the power amplifier by monitoring the output power, and using a common circuit board, of the N band circuits A transmission unit of a wireless communication apparatus that transmits a high-frequency signal from one wireless unit in a band circuit in which a component for a band circuit is actually mounted is obtained.

  According to still another aspect of the present invention, an antenna, a high-frequency changeover switch, a duplexer provided for each band, a radio unit, a power amplifier, and an isolator, each of N band circuits, and the power amplifier The multi-band high-frequency power monitor circuit that controls the power output from the power amplifier by monitoring the output power, and using a common circuit board, A wireless communication device is obtained in which one radio unit of a band circuit having a band circuit component mounted thereon receives a high-frequency signal received by the antenna and processes a high-frequency signal for transmission. .

  According to the present invention, even when a plurality of bands are selectively applied, one type of circuit board can be used, and an effect that the circuit board can be designed economically is obtained.

It is a circuit block diagram of the radio | wireless communication apparatus provided with the multiband corresponding | compatible high frequency electric power monitor circuit of a 1st Example. FIG. 2 is a circuit block diagram when two bands are used in the wireless communication apparatus of FIG. 1. It is a wiring diagram which shows the wiring example (a) of the capacitor | condenser removed in the multi-band corresponding | compatible high frequency power monitor circuit, (b). It is a circuit block diagram of the radio | wireless communication apparatus provided with the multi-band corresponding | compatible high frequency electric power monitor circuit of 2nd Example. FIG. 5 is a circuit block diagram when two bands are used in the wireless communication apparatus of FIG. 4. It is a circuit block diagram of the radio | wireless communication apparatus provided with the general multiband corresponding | compatible high frequency electric power monitor circuit. FIG. 7 is a circuit block diagram obtained by improving the multi-band compatible high frequency power monitor circuit of FIG. 6. FIG. 7 is a circuit block diagram when two bands are used in the wireless communication apparatus of FIG. 6. FIG. 7 is a circuit block diagram showing a state where a coupler is removed when using two bands in the wireless communication device of FIG. 6. FIG. 8 is a circuit block diagram when two bands are used in the wireless communication apparatus of FIG. 7. FIG. 8 is a circuit block diagram of a state in which a coupler is removed when using two bands in the wireless communication device of FIG. 7.

  Details will be described below.

  A first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a circuit block diagram of a wireless communication apparatus provided with a multi-band high-frequency power monitor circuit according to the first embodiment. FIG. 2 is a circuit block diagram when two bands are used in the wireless communication apparatus of FIG. FIG. 3 is a wiring diagram showing wiring examples (a) and (b) of capacitors removed in the multi-band compatible high-frequency power monitoring circuit. In the present embodiment, as in FIG. 6, a description will be given of an example in which a multiband high-frequency power monitor circuit is used for a transmission unit of a mobile phone terminal device that is a wireless communication device. In the present embodiment, an example in the case of corresponding to three bands (bands 1 to 3) is shown, and the case of using three bands and an arbitrary band of the three bands using the same circuit board is illustrated. To do. In addition, the elements constituting the band circuit corresponding to the bands 1 to 3 are represented with the last digit of the code corresponding to 1 to 3.

  The common part of the apparatus includes a radio communication antenna (ANT) 10, a high frequency changeover switch (ANTSW) 20, and a terminator 160. The band circuit 1 for band 1 includes a duplexer (DUP) 111, a radio unit (TRX) 121, a power amplifier (PA) 131, a capacitor (C) 151, and an isolator (ISO) 171. The band circuit 2 for band 2 includes a duplexer (DUP) 112, a radio unit (TRX) 122, a power amplifier (PA) 132, a capacitor (C) 152, and an isolator (ISO) 172. The band circuit 3 for the band 3 includes a duplexer (DUP) 113, a radio unit (TRX) 123, a power amplifier (PA) 133, a capacitor (C) 153, and an isolator (ISO) 173.

  The high frequency changeover switch (ANTSW) 20 is a switch for switching and connecting between the antenna (ANT) 10 and the three duplexers (DUP) 111, 112, and 113. At the time of reception, a high frequency signal from the antenna is sent from terminals RF1, RF2, and RF3 to input / output common terminals of three duplexers (DUP) 111, 112, and 113, respectively. At the time of transmission, conversely, a high-frequency signal is sent from the input / output shared terminals of the duplexers (DUP) 111, 112, 113 to the terminals RF1, RF2, RF3 of the high-frequency switch (ANTSW) 20, and further, the high-frequency switch (ANTSW) 20 To the antenna (ANT) 10. As shown in the figure, between the antenna (ANT) 10 and the high frequency changeover switch (ANTSW) 20, between the terminals RF1, RF2 and RF3 of the high frequency changeover switch (ANTSW) 20 and the duplexers (DUP) 111, 112 and 113. The terminal is shared during transmission and reception.

  Hereinafter, the transmission / reception operations of the respective band circuits will be described. The operations of the band circuits 1 to 3 that respond to the bands 1 to 3 are the same, and only the frequency bands that respond are different. At the time of reception, a high frequency signal from the high frequency changeover switch (ANTSW) 20 is transmitted from the reception output terminal RX1 of the duplexer (DUP) 111 to the radio unit (TRX) 121. Similarly, the signal is transmitted from the reception output terminal RX 2 of the duplexer (DUP) 112 to the radio unit (TRX) 122. Similarly, the signal is transmitted from the reception output terminal RX3 of the duplexer (DUP) 113 to the radio unit (TRX) 123. The radio unit (TRX) processes high-frequency signals to be transmitted and received.

  At the time of transmission, a signal from the radio unit (TRX) 121 is input to the transmission input terminal (TX1) of the duplexer (DUP) 111 via the power amplifier (PA) 131 and the isolator (ISO) 171. Further, the signal is transmitted from the duplexer (DUP) 111 via the high frequency changeover switch (ANTSW) 20 and the antenna (ANT) 10. A signal from the radio unit (TRX) 122 is input to the transmission input terminal (TX2) of the duplexer (DUP) 112 via the power amplifier (PA) 132 and the isolator (ISO) 172. Further, the signal is transmitted from the duplexer (DUP) 112 via the high frequency changeover switch (ANTSW) 20 and the antenna (ANT) 10.

  Similarly, a signal from the radio unit (TRX) 123 is input to the transmission input terminal (TX3) of the duplexer (DUP) 113 via the power amplifier (PA) 133 and the isolator (ISO) 173. Further, the signal is transmitted from the duplexer (DUP) 113 via the high frequency changeover switch (ANTSW) 20 and the antenna (ANT) 10. The radio unit (TRX), the power amplifier (PA), the isolator (ISO), and the duplexer (DUP) in each of the band circuits are collectively referred to as a transmission unit.

  The multi-band compatible high-frequency power monitor circuit includes a capacitor for monitoring outputs from the power amplifiers (PA) of the band circuits 1 to 3, a terminator, and a power detector. Capacitor (C) 151 that monitors the output of power amplifier (PA) 131 in band 1 has one end connected to a wiring that connects the output of power amplifier (PA) 131 and the input of isolator (ISO) 171. . The other terminal of the capacitor (C) 151 is connected to the terminator (T) and the other terminal of the capacitor (C) 152. Capacitor (C) 152 that monitors the output of power amplifier (PA) 132 in band 2 has one end connected to a wiring that connects the output of power amplifier (PA) 132 and the input of isolator (ISO) 172. . The other terminal of the capacitor (C) 152 is connected to the other terminals of the capacitors (C) 151 and 153. Capacitor (C) 153 that monitors the output of power amplifier (PA) 133 in band 3 has one end connected to a wiring that connects the output of power amplifier (PA) 133 and the input of isolator (ISO) 173. . The other terminal of the capacitor (C) 153 is connected to the other terminal of the capacitor (C) 152 and a power detector (not shown).

  As shown in FIG. 1, in the multiband high-frequency power monitor circuit, one end of a capacitor (C) is connected to the power amplifier (PA) of each band circuit, and the other terminal of the capacitor (C) is a terminator (T). 160 and a power detector (not shown) are connected in cascade. As shown in FIG. 1, the other end of the band 1 capacitor, the other end of the band 2 capacitor, and the other end of the band 3 capacitor are sequentially connected between the terminator and the power detector. In the present invention, such a connection is expressed by connecting the terminator, the other end of the band 1 capacitor, the other end of the band 2 capacitor, and the other end of the band 3 capacitor to the power detector in cascade. Here, the power of the power amplifier (PA) in each band is monitored by each capacitor (C), and the output is sent to the power detector. As described above, the high-frequency power monitor circuit capable of supporting three bands includes one terminator, three capacitors, and a power detector.

  The wireless communication apparatus of FIG. 1 is a circuit block in which three band circuits are configured. Since the antenna (ANT) 10, the high-frequency changeover switch (ANTSW) 20, and the terminator (T) 160 are common to the three bands, they must be mounted. For each band circuit, it is necessary to mount elements constituting each band circuit. The elements constituting each of the band circuits 1 to 3 are made to correspond to the band circuits 1 to 3, with the last digit of the code being 1 to 3. In the following description, the band circuit may be simply referred to as a band for the sake of simplicity.

  Each of the band circuits is composed of components of a duplexer (DUP), a radio unit (TRX), an isolator (ISO), a power amplifier (PA), and a capacitor (C). When band 1 is necessary, a duplexer (DUP) 111, a radio unit (TRX) 121, an isolator (ISO) 171, a power amplifier (PA) 131, and a capacitor (C) 151 are mounted. When band 2 is required, a duplexer (DUP) 112, a radio unit (TRX) 122, an isolator (ISO) 172, a power amplifier (PA) 132, and a capacitor (C) 152 are mounted. When band 3 is required, a duplexer (DUP) 113, a radio unit (TRX) 123, an isolator (ISO) 173, a power amplifier (PA) 133, and a capacitor (C) 153 are mounted. For band circuits that are not necessary, each duplexer (DUP), radio unit (TRX), isolator (ISO), power amplifier (PA), and capacitor (C) are not mounted. Can do.

  Here, the capacitance of the capacitor (C) is set to a size necessary for monitoring the power of the power amplifier (PA). The capacitance of the capacitor (C) 151 is set so that the power detected by the power detector is −20 dB or less with respect to the output power of the power amplifier (PA) 131. The capacitance of the capacitor (C) 152 is set so that the power detected by the power detector is −20 dB or less with respect to the output power of the power amplifier (PA) 132. The capacitance of the capacitor (C) 153) is set so that the power detected by the power detector is −20 dB or less with respect to the output power of the power amplifier (PA) 133.

  Further, in the high frequency power monitor circuit of the present invention, minute power is extracted from the output from the power amplifier (PA). Therefore, it is important to match the characteristic impedance of the circuit board wiring from the terminator (T) to the power detector. The circuit board wiring from the terminator (T) to the power detector is wired with characteristic impedance (50Ω in this embodiment). The characteristic impedance of the terminator (T) 160 is preferably the same impedance as that of the wiring. In this embodiment, the characteristic impedance is preferably 50Ω, and the input impedance of the power detector is preferably the same. Yes, in this embodiment, it is 50Ω. In this way, the connection wiring between the terminator, each capacitor and the power detector is connected by the distributed constant circuit, and the characteristic impedance of the connection wiring, the termination impedance of the termination device, and the input impedance of the power detector match. It is preferable to do.

  As described above, the characteristic impedance of the circuit board wiring from the terminator (T) to the power detector needs to be matched. Therefore, when a certain band is not used, the wiring impedance when the capacitor is not mounted must also be a value close to the characteristic impedance. FIG. 3 shows an example of circuit board wiring in the vicinity where the capacitor is mounted. FIG. 3A is a preferred example (this example), and FIG. 3B is an inappropriate example. The case where the capacitor (C) is mounted on the upper side of each of FIGS. 3A and 3B and the capacitor is not mounted on the lower side is shown.

  In FIG. 3A, a pad for mounting a capacitor is provided directly on the wiring. On the other hand, FIG. 3B shows a stub structure in which a pad for mounting a capacitor is extended from a wiring. In such a stub structure, it is difficult to have the same characteristic impedance when the capacitor (C) is mounted and when it is not mounted. Therefore, the capacitor (C) 151, the capacitor (C) 152, and the capacitor (C) 153 have circuit board wiring as shown in FIG. 3A so that the connection point of both terminals does not have a stub structure when removed. There is a need to do. As described above, the circuit board is provided with wiring for connecting the constituent elements and pads for adhering the constituent elements, and it is possible to select whether the elements are mounted on the pads for adhering the constituent elements or not. is there.

  FIG. 1 described above is an example of element mounting when all of the band circuit 1, the band circuit 2, and the band circuit 3 are used. In FIG. 2, the band circuit 1 and the band circuit 3 are used, and the band circuit 2 is not used. An example of device mounting in the case is shown. In FIG. 2, an antenna (ANT) 10, a high frequency changeover switch (ANTSW) 20, a terminator (T) 160, a duplexer (DUP) 111, a radio unit (TRX) 121, an isolator (ISO) 171, , Power amplifier (PA) 131, capacitor (C) 151, duplexer (DUP) 113, radio unit (TRX) 123, isolator (ISO) 173, power amplifier (PA) 133, capacitor (C ) 153. Duplexer (DUP) 112, radio section (TRX) 122, isolator (ISO) 172, power amplifier (PA) 132, and capacitor (C) 152 are not mounted.

  Next, the operation of the embodiment will be described. In FIG. 1, a high frequency changeover switch (ANTSW) 20 is a high frequency path changeover switch that switches the band circuit 1, the band circuit 2, and the band circuit 3. When the band circuit 1 is selected, the terminal (RFI) is connected and the duplexer (DUP) 111 is connected to the antenna (ANT) 10. When the band circuit 2 is selected, the terminal (RF2) is connected and the duplexer (DUP) 112 is connected to the antenna (ANT) 10. When the band circuit 3 is selected, the terminal (RF3) is connected and the duplexer (DUP) 113 is connected to the antenna (ANT) 10. The duplexer (DUP) includes a reception filter and a transmission filter, and combines the transmission unit and the reception unit without mutual interference between the transmission unit and the reception unit.

  The isolator (ISO) allows high-frequency power input to the input terminal to pass through the output terminal, absorbs the high-frequency power returned by reflection to the output terminal with the built-in termination resistor, and the operation of the output impedance does not affect the input impedance do. The power amplifier (PA) amplifies transmission power. The radio unit (TRX) performs a transmission / reception operation. The capacitor (C) branches and passes a part of the high frequency output power of the power amplifier (PA). The terminator (T) is terminated with its impedance at the end of the characteristic impedance line to prevent high frequency power reflection.

  When the band 1 is selected, the radio unit (TRX) 121 is activated, and the transmission high-frequency power output from the transmission output terminal of the radio unit (TRX) 121 is amplified by the power amplifier (PA) 131. The amplified transmission high-frequency power passes through the isolator (ISO) 171 and the duplexer (DUP) 111, is switched by the high-frequency changeover switch (ANTSW) 20, and is output from the antenna (ANT) 10. The signal received by the antenna (ANT) 10 is route-switched by the high frequency changeover switch (ANTSW) 20, passes through the duplexer (DUP) 111, and is input to the reception input terminal of the radio unit (TRX) 121 and received. . Also, the transmission power output from the isolator does not return to the input end of the isolator even if there is reflected power due to impedance mismatch. Further, a part of the transmission power output from the power amplifier (PA) 131 is input to the power detector through the capacitor (C) 151.

  When the band 2 is selected, the radio unit (TRX) 122 is activated, and the transmission high frequency power output from the transmission output terminal of the radio unit (TRX) 122 is power amplified by the power amplifier (PA) 132. The amplified transmission high-frequency power passes through an isolator (ISO) 172 and a duplexer (DUP) 112, is switched by a high-frequency switching switch (ANTSW) 20, and is output from an antenna (ANT) 10. The signal received by the antenna (ANT) 10 is route-switched by the high frequency changeover switch (ANTSW) 20, passes through the duplexer (DUP) 112, and is input to the reception input terminal of the radio unit (TRX) 122 and received. . Also, the transmission power output from the isolator does not return to the input end of the isolator even if there is reflected power due to impedance mismatch. Further, a part of the transmission power output from the power amplifier (PA) 132 is input to the power detector through the capacitor (C) 152.

  When the band 3 is selected, the radio unit (TRX) 123 is activated, and the transmission high-frequency power output from the transmission output terminal of the radio unit (TRX) 123 is amplified by the power amplifier (PA) 133. The amplified transmission high-frequency power passes through the isolator (ISO) 173 and the duplexer (DUP) 113, is switched by the high-frequency switching switch (ANTSW) 20, and is output from the antenna (ANT) 10. The signal received by the antenna (ANT) 10 is route-switched by the high frequency changeover switch (ANTSW) 20, passes through the duplexer (DUP) 113, and is input to the reception input terminal of the radio unit (TRX) 123 and received. . Also, the transmission power output from the isolator does not return to the input end of the isolator even if there is reflected power due to impedance mismatch. Further, part of the transmission power output from the power amplifier (PA) 133 is input to the power detector through the capacitor (C) 153.

  In each band, a part of transmission power output from the power amplifier (PA) is input to the power detector through the capacitor (C). The power detector generates a control signal according to the input power level, and controls the power amplifier (PA) so that the transmission power from the force amplifier (PA) is constant. Further, as described in the configuration of the embodiment, even if only two to one of the three bands are used and the constituent elements of the unused band circuit are not mounted, in this embodiment of the present invention, each band The operation of the selected band is performed without affecting the operation of.

  As described above, according to the present embodiment, it is possible to obtain a multiband compatible high frequency monitor circuit capable of selecting a band circuit on which a component is mounted. The wireless communication apparatus provided with the multi-band compatible high-frequency monitor circuit of the present invention can have one type of circuit board and can select a band circuit to be used. Therefore, there is an effect that the circuit board can be designed economically. Further, even if not all the components of the unnecessary band circuit are mounted, the function can be satisfied in a predetermined band and the circuit can be economically constructed. Therefore, as a wireless communication apparatus, it is not necessary to design a circuit board for each destination, and only necessary circuit components are mounted for each destination. According to the present embodiment, a multi-band compatible high frequency monitor circuit capable of selecting a band to be operated with one type of circuit board can be obtained, and a radio communication apparatus including the multi-band compatible high frequency monitor circuit can be provided.

  A second embodiment of the present invention will be described in detail with reference to FIGS. FIG. 4 shows a circuit block diagram of a wireless communication apparatus provided with the multi-band high-frequency power monitor circuit of the second embodiment. FIG. 5 shows a circuit block diagram when two bands are used in the wireless communication apparatus of FIG. In this embodiment, compared with the first embodiment shown in FIG. 1, one terminal of the capacitor of the high frequency power monitor circuit provided in each band circuit is connected to the respective terminator and distributor. Is different. The rest of the configuration is the same as in FIG.

  As shown in FIG. 4, the high-frequency power monitor circuit provided in each band circuit is composed of a terminator, a capacitor, and a distributor. One end of the capacitor (C) is connected to the output of the power amplifier (PA), and the other terminal of the capacitor (C) is connected to each terminator (T) and one input terminal of the distributor (DIV). To do. One end of the capacitor (C) 151 of the band circuit 1 is connected to a wiring connecting the output of the power amplifier (PA) 131 and the input of the isolator (ISO) 171. The other terminal of the capacitor (C) 151 is connected to one input terminal of the terminator (T) 161 and the distributor (DIV) 30.

  One end of the capacitor (C) 152 of the band circuit 2 is connected to the wiring connecting the output of the power amplifier (PA) 132 and the input of the isolator (ISO) 172. The other terminal of the capacitor (C) 152 is connected to the other input terminal of the terminator (T) 162 and the distributor (DIV) 30. One end of the capacitor (C) 153 of the band circuit 3 is connected to a wiring connecting the output of the power amplifier (PA) 133 and the input of the isolator (ISO) 173. The other terminal of the capacitor (C) 153 is connected to the other terminal of the terminator (T) 163 and the distributor (DIV) 30. The output of the distributor (DIV) 30 is connected to a power detector (not shown).

  In each band circuit, a part of the transmission power output from the power amplifier (PA) is input to each input terminal of the distributor (DIV) 30 through the capacitor (C). The output of the divider (DIV) 30 is input to the power detector, and the power detector generates a control signal according to the input power level and controls the power amplifier (PA) so that the transmission power becomes constant. Thus, also in the second embodiment, the same operation as in the first embodiment can be realized.

  FIG. 5 shows a mounting example of the constituent elements in the wireless communication apparatus when the band 1 and the band 3 are used and the band 2 is not used in the second embodiment. As a common part, an antenna (ANT) 10, a high frequency changeover switch (ANTSW) 20, and a distributor (DIV) 30 as a high frequency power monitor circuit are necessarily mounted. Further, as the band circuit 1, all components of the duplexer (DUP) 111, the radio unit (TRX) 121, the power amplifier (PA) 131, the capacitor (C) 151, the terminator (T) 161, and the isolator (ISO) 171 Is implemented. As the band circuit 2, the duplexer (DUP) 112, the radio unit (TRX) 122, the power amplifier (PA) 132, the capacitor (C) 152, and the isolator (ISO) 172 are not mounted, and only the terminator (T) 161 is mounted. Implement. As the band circuit 3, all components of the duplexer (DUP) 113, the radio unit (TRX) 123, the power amplifier (PA) 133, the capacitor (C) 153, the terminator (T) 163, and the isolator (ISO) 173 Is implemented.

  In the circuit configuration and element mounting shown in the second embodiment, the operation in the predetermined frequency band is the same as in the first embodiment. Accordingly, the circuit board can be economically shared as in the first embodiment, and the circuit can be economically constructed by mounting only the elements constituting the necessary band circuit.

As described above, according to the present invention, a multi-band compatible high-frequency monitor circuit capable of selecting a frequency band to be operated can be obtained with one type of circuit board, and a wireless communication device including the multi-band compatible high-frequency monitor circuit is obtained. It is done.

  As mentioned above, although this invention was demonstrated as an Example, this invention is not limited to said Example. Various changes can be made to the configuration and details of the present invention within the scope of the present invention.

10 Antenna (ANT)
20 High-frequency switch (ANTSW)
30 Distributor (DIV)
111, 112, 113 Duplexer (DUP)
121, 122, 123 Radio unit (TRX)
131, 132, 133 Power amplifier (PA)
141, 142, 143 Coupler (CUP)
151, 152, 153 Capacitor (C)
160, 161, 162, 163 Terminator (T)
171 172 173 Isolator (ISO)

Claims (7)

A communication circuit capable of providing N (N is an integer of 2 or more) band circuits having a power amplifier and an isolator to which the output of the power amplifier is input as a band circuit that operates for each band. A first to M-th band circuit (M is a positive integer smaller than or equal to N) is selected from the N band circuits, which are configured by using a substrate, and actually implement components.
One end of each of the first to M-th capacitors is connected to the output of each of the power amplifiers of the first to M-th band circuits on which the selected component is mounted, and each of the first to M-th capacitors. The other end of the multi-band high-frequency power monitor circuit is connected between a terminator and a power detector. A communication circuit capable of providing N (N is an integer of 2 or more) band circuits having a power amplifier and an isolator to which the output of the power amplifier is input as a band circuit that operates for each band. A first to Mth band circuit (M is a positive integer smaller than or equal to N) is selected from the N band circuits, which are configured using a substrate, and actually implement the constituent elements.
One end of each of the first to M-th capacitors is connected to the output of each of the power amplifiers of the first to M-th band circuits on which the selected component is mounted, and each of the first to M-th capacitors is connected. The other end is connected to the first to Mth terminators and the first to Mth input terminals of the distributor, and the output of the distributor is connected to a power detector. High frequency power monitor circuit.   3. The multiband-compatible high-frequency power monitor circuit according to claim 1 or 2, wherein the first to Mth capacitors have capacitances output to a power detector side compared to output powers of power amplifiers connected thereto. A multiband high-frequency power monitor circuit, wherein the selected power is selected to be 1/100 or less.   2. The multiband high-frequency power monitor circuit according to claim 1, wherein connection wires between the terminator, each capacitor, and the power detector are connected by a distributed constant circuit having specific characteristic impedance, and the termination impedance of the terminator is A multi-band high-frequency power monitoring circuit that matches the characteristic impedance of the distributed constant circuit and that the input impedance of the power detector matches the characteristic impedance of the distributed constant circuit.   The multiband-compatible high-frequency power monitor circuit according to claim 2, wherein the connection wiring of each terminator, each capacitor, and each input terminal of the distributor is connected by a distributed constant circuit having a specific characteristic impedance, A multi-band high-frequency power monitor circuit characterized in that the termination impedance of the terminator matches the characteristic impedance of the distributed constant circuit, and the input impedance of the distributor matches the characteristic impedance of the distributed constant circuit. N band circuits each having an antenna, a high-frequency switching switch, a duplexer, a radio unit, a power amplifier, and an isolator provided for each band, and monitoring the power output from the power amplifier to monitor the power A multiband-compatible high-frequency power monitor circuit according to any one of claims 1 to 5, which controls power output from an amplifier, and using a common circuit board, the N band circuits are actually A transmission unit of a wireless communication device, which transmits a high-frequency signal from one wireless unit in a band circuit on which a band circuit component is mounted. N band circuits each having an antenna, a high-frequency switching switch, a duplexer, a radio unit, a power amplifier, and an isolator provided for each band, and monitoring the power output from the power amplifier to monitor the power A multiband-compatible high-frequency power monitor circuit according to any one of claims 1 to 5, which controls power output from an amplifier, and using a common circuit board, actually, among the N band circuits. One wireless unit of a band circuit on which a band circuit component is mounted receives a high-frequency signal received by the antenna and processes a high-frequency signal for transmission. apparatus.

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