JP2006222629A - Amplifying device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an amplifying device which amplifies signals of various bands through a single amplifier. <P>SOLUTION: The amplifying device 1a is composed of an amplifier 10 which is capable of operating on signals of a prescribed band; and filter-type matching circuits 21 to 23 and 31 to 33 which are provided to the input and the output of the amplifier 10 so as to make an impedance matching between the amplifier 10 and the prescribed external units, and enable signals of specific bands within a certain band possessed by the amplifier 10 to penetrate through them. The filter-type matching circuits 21 to 23 and 31 to 33 each have their own specific bands respectively, and the filter-type matching circuits 21 to 23 and 31 to 33 function as a load on the amplifier only on their specific frequency bands. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an amplifying apparatus, and more particularly, to an amplifying apparatus that amplifies a plurality of frequency bands (hereinafter simply referred to as “bands”) using a single amplifier.

  In this specification, an amplifying apparatus has an input port, an output port, and an amplifier, and is an apparatus that is connected to another apparatus via the input port and the output port. The gain and band, which are the main characteristics of the amplifying apparatus, are usually determined according to the gain and band of the amplifier included in the amplifying apparatus. The amplifier may be configured by a plurality of elements, or may be configured by only one amplifying element (for example, FET (Field Effect Transistor)).

  In order to amplify signals in a plurality of bands by the amplifying apparatus, it is necessary to use an amplifier that can be used in a wide band so that a gain of a certain level or more can be obtained in all the bands. In such an amplifier, when it is necessary to make a difference in gain in each of a plurality of bands, the difference in gain appears as a slope of the gain in each band. Therefore, it is difficult to obtain gain flatness in each band. In order to obtain flatness of the gain in each band, it is effective to make the gain constant in the entire band of the amplifier, but it is difficult to change the gain for each band in the amplifier having such a configuration. It is. Also, it is difficult to realize an amplifier with a wide bandwidth and a constant gain.

  An amplifier that amplifies signals in a plurality of bands. As a practical solution for making a gain difference in each band and obtaining a flatness of the gain in each band, an amplifier is provided for each band in the amplifier. There is a method to prepare. In this method, a signal can be amplified with a desired gain in accordance with the frequency by separating the signal for each band and then amplifying the signal with each amplifier and synthesizing the outputs again.

  In an amplifying apparatus that prepares an amplifier for each band and amplifies signals in a plurality of bands, it is necessary to prepare the same number of amplifiers as the number of bands. Therefore, the amplifying device tends to be large, and it is difficult to suppress power consumption. Moreover, it is difficult to suppress the cost.

  In view of the above problems, an object of the present invention is to provide an amplifying apparatus that amplifies signals in a plurality of bands using a single amplifier.

  An amplifying apparatus of the present invention that solves the above-described problem is provided with a plurality of amplifying means operable in a predetermined band and at least one of an input and an output of the amplifying means, and the amplifying means is provided between And a matching unit that performs impedance matching only in a specific band within the band. Each matching means is configured such that the specific band is different.

  Another amplification device of the present invention is provided with a plurality of amplification means operable in a predetermined band and at least one of an input and an output of the amplification means, and impedance matching between the amplification means and a predetermined external device is performed. And a filter type matching means for passing a signal in a specific band within the band of the amplification means. The specific band is different for each filter type matching unit, and each filter type matching unit is configured to act as a load on the amplification unit in its specific band.

  In these amplifying devices of the present invention, the matching means or the filter type matching means (hereinafter referred to as “matching means etc.”) can be impedance-matched with the amplifying means only in a specific band. . The matching means or the like is impedance-matched with the amplifying means only in its own specific band, but is in the same state as the open state from the amplifying means other than its own specific band. Since specific bands such as a plurality of matching means are different from each other, the amplifying means is impedance-matched with any of the matching means or the like for each specific band such as each matching means. Since the amplifying means amplifies the input signal only when impedance matching is performed with the matching means or the like, the input signal is amplified for each specific band. Therefore, it is possible to amplify a plurality of specific band signals by one amplifying means.

  In such an amplifying apparatus, the filter type matching means may further comprise means such as a resistor for adjusting the gain by the amplifying means. By providing such means, it is possible to make a difference in gain by the amplifying means for each specific band. In this case, the gain of a specific band is flat in each band.

Such filter type matching means can be realized with the following configuration. For example, the filter type matching means allows the signal of the specific band to pass through, the first filter means for matching impedance with the predetermined external device, and the signal of the specific band to pass. A second filter means for matching impedance only with the specific band with the amplifying means, and an impedance match for the first filter means and the second filter means with the specific band. Matching means, and configured to act as a load of the amplification means within the specific band.
At least one of the first filter means, the second filter means, and the matching means can be realized by, for example, a lumped constant element and / or a distributed constant circuit.

  The amplifying unit includes, for example, an amplifying element. This amplifying element may be, for example, one FET. In such a configuration, the filter-type matching unit is configured to perform impedance matching with the amplifying element in the specific band of itself. This configuration is an example of realizing the amplification means with the simplest configuration.

  According to the present invention as described above, it is possible to amplify signals in a plurality of bands by one amplifier.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a configuration diagram of an amplifying apparatus 1a according to the first embodiment of the present invention. The amplifying apparatus 1 a is configured to receive a signal including a predetermined frequency component from the input port 2, amplify specific three bands included in the signal, and output the amplified signal from the output port 3. The amplifying device 1 a includes an amplifier 10, three filter type matching circuits 21, 22, and 23 provided between the input port 2 and the input terminal 4 of the amplifier 10, and an output terminal 5 and an output port 3 of the amplifier 10. Three filter type matching circuits 31, 32, and 33 are provided between them.

  The amplifier 10 is operable in a predetermined band, and may be composed of a plurality of elements, but may be composed of a single amplifying element. In the present embodiment, as an example of a configuration with one amplifying element, an example configured with FETs is shown.

  The three filter type matching circuits 21, 22, and 23 are each provided with a filter that allows signals in different bands to pass, and are external devices connected to the amplifier 10 and the amplifying device 1 a in this pass band via the input port 2. Between the two and the impedance matching. Further, the filter type matching circuits 21, 22, and 23 function as loads for the amplifier 10 in the respective pass bands. In this embodiment, since there are three bands to be amplified by the amplifying apparatus 1a, the configuration is such that three filter type matching circuits are used on the input side and the output side of the amplifier 10, respectively. The number of filter type matching circuits is determined according to the above.

  The three filter type matching circuits 31, 32, 33 are provided in one-to-one correspondence with the filter type matching circuits 21, 22, 23, and pass through the corresponding filter type matching circuits 21, 22, 23. A signal in the same band as that of the band is passed. For example, the filter matching circuit 21 and the filter matching circuit 31 pass signals in the same band, and the filter matching circuit 22 and the filter matching circuit 32 pass signals in the same band. Therefore, the filter type matching circuit 23 and the filter type matching circuit 33 pass signals in the same band. The filter-type matching circuits 31, 32, and 33 are configured so that impedance matching between the amplifier 10 and the external device connected through the output port 3 of the amplifying device 1a can be obtained in the pass band.

  In this embodiment, the filter type matching circuits 21, 22, and 23 are connected to the input terminal 4 of the amplifier 10, and the filter type matching circuits 31, 32, and 33 are connected to the output terminal 5 of the amplifier 10. These may be provided on either the input side or the output side of the amplifier 10. If it is provided in either one, the effect of the present invention can be obtained.

  FIG. 2 is a circuit diagram showing a specific example of the filter type matching circuit 21. The filter-type matching circuit 21 and the filter-type matching circuits 22 and 23 have the same circuit configuration, and only the pass band and the impedance value for matching are different. Therefore, only the filter matching circuit 21 is described here, and the description of the filter matching circuits 22 and 23 is omitted.

The filter type matching circuit 21 includes a first filter 24, a first matching unit 25, and a second filter 26.
The first filter 24 is configured by a BPF (Band Pass Filter), an LPF (Low Pass filter), or an HPF (High Pass Filter) that matches the characteristic impedance of the amplification device 1a itself.
The first matching unit 25 matches the impedance of the amplifier 10 and the characteristic impedance of the amplifying apparatus 1a.
The second filter 26 is configured by BPF, LPF, or HPF that matches the impedance of the amplifier 10. The pass band by the second filter 26 is the same as the pass band by the first filter 24.

  The first filter 24 and the second filter 26 determine the pass band by the filter type matching circuit 21. Depending on where the pass band corresponds to the band of the amplifier 10, either the BPF, the LPF, or the HPF is selected. Is used. For example, when a predetermined frequency or higher in the band of the amplifier 10 is used as the pass band, HPF or BPF is selected as the first filter 24 and the third filter 26. When the pass band is a predetermined frequency or less in the band of the amplifier 10, LPF or BPF is selected as the first filter 24 and the third filter 26. When a predetermined band within the band of the amplifier 10 is used as a pass band, BPF is selected as the first filter 24 and the third filter 26.

  The impedance of the first matching unit 25 is designed to work as a load only within the pass band of the first filter 24 and the second filter 26. The impedance of the first filter 24 also works as a load only within the pass band. With such a configuration, the filter type matching circuit 21 acts as a load only in the pass bands of the first filter 24 and the second filter 26.

  FIG. 3 is a circuit diagram showing a specific example of the filter type matching circuit 31. The filter-type matching circuit 31 and the filter-type matching circuits 32 and 33 have the same circuit configuration, and are different in only passbands and impedance values for matching. Therefore, only the filter matching circuit 31 will be described here, and the description of the filter matching circuits 32 and 33 will be omitted.

The filter type matching circuit 31 includes a third filter 34, a second matching unit 35, and a fourth filter 36.
The third filter 34 is configured by BPF, LPF, or HPF that matches the characteristic impedance of the amplification device 1a itself.
The second matching unit 35 matches the impedance of the amplifier 10 and the characteristic impedance of the amplification device 1a.
The fourth filter 36 is configured by BPF, LPF, or HPF that matches the impedance of the amplifier 10.

  As described above, since the pass bands of the filter type matching circuits 31, 32, and 33 are the same as the pass bands of the corresponding filter type matching circuits 21, 22, and 23, respectively, the third filter 34 and the fourth filter 36 are used. The pass band is the same as the pass band of the first filter 24 and the second filter 26 included in the corresponding filter type matching circuits 21, 22, and 23.

  The impedance of the second matching unit 35 is designed to work as a load only within the pass band of the third filter 34 and the fourth filter 36. The impedance of the fourth filter 36 also works as a load only within the pass band. With such a configuration, the filter-type matching circuit 31 acts as a load only in the pass bands of the third filter 34 and the fourth filter 36.

In such an amplifying apparatus 1 a, the signal input from the input port 2 is sent to the filter type matching circuits 21, 22, and 23. In the filter type matching circuits 21, 22, 23, the transmitted signal is filtered only to a signal in a desired band (specific band). If there is a signal of a specific band as a result of filtering, it is sent to the amplifier 10. At this time, the filter type matching circuits 21, 22, and 23 act as loads on the amplifier 10. If there is no signal in a specific band, the filter-type matching circuits 21, 22, and 23 are invisible to the amplifier 10, and are in the same state as being open.
The signal sent to the amplifier 10 is amplified by the amplifier 10. The amplification result is output to the outside from the output port 3 via the filter type matching circuits 31, 32, and 33.

  FIG. 4 is a configuration diagram of an amplifying apparatus 1b according to the second embodiment of the present invention. The amplifying device 1b includes the same components as the amplifying device 1a of the first embodiment. The difference is that the input ports 2a, 2b, 2c and the output ports 3a, 3b, 3c are respectively filter-type matching circuits 21. To 23, 31 to 33. With such a configuration, the input ports 2a, 2b and 2c and the output ports 3a, 3b and 3c are dedicated to the passbands of the filter type matching circuits 21 to 23 and 31 to 33 to be connected.

  The first filter 24, the first matching unit 25, the second filter 26, the third filter 34, and the second matching unit 35 used in the filter type matching circuits 21 to 23 and 31 to 33 of the amplification devices 1a and 1b as described above. Specific examples of circuits that can be used for the fourth filter 36 are shown in FIGS. Filter type matching circuits 21 to 23 and 31 to 33 can be configured by combining the circuits shown in FIGS.

FIG. 5 shows an example in which an inductor and a capacitor are used as a lumped constant circuit. The pass band and the impedance value can be determined by the inductance value, the capacitance value, and the connection form.
FIG. 5A shows an LC parallel resonant circuit in which an inductor and a capacitor are connected in parallel. It can be used for blocking the passage of a signal in a specific band and for impedance conversion.
FIG. 5B shows an LC series resonance circuit in which an inductor and a capacitor are connected in series. It can be used for passing a signal in a specific band and for impedance conversion.
FIG. 5C shows an LC parallel resonant circuit in which an inductor and a capacitor are connected to a shunt in parallel. It can be used for passing a signal in a specific band and for impedance conversion.
FIG. 5D shows an LC series resonance circuit in which an inductor and a capacitor are connected to a shunt in series. It can be used for blocking the passage of a signal in a specific band and for impedance conversion.

FIG. 6 shows an example using a microstrip line as a distributed constant circuit. The passband and impedance value can be determined by the length of the microstrip line and the connection form.
FIG. 6A shows an open-type distributed constant circuit in which a microstrip line is provided on a transmission line, and another microstrip line is provided on the transmission line as a shunt and remains open. It can be used for blocking the passage of a signal in a specific band and for impedance conversion.
FIG. 6B shows a short-circuit type distributed constant circuit in which a microstrip line is provided on a transmission line and another microstrip line is connected to the transmission line in a shunt. It can be used for blocking the passage of a signal in a specific band and for impedance conversion.
FIG. 6C shows a parallel line type distributed constant circuit in which two microstrip lines are provided in parallel. It can be used for passing a signal in a specific band and for impedance conversion.
FIG. 6D shows a parallel line type distributed constant circuit in which two microstrip lines are shunted with respect to the transmission line and two microstrip lines are provided in parallel. It can be used for blocking the passage of signals in the vicinity of a specific band and for impedance conversion.

FIG. 7 is an example of a circuit diagram of the filter type matching circuits 21 to 23 and 31 to 33.
In this circuit, the first filter 24 (third filter 34) is formed by connecting the parallel line type distributed constant circuit of FIG. 6C in series, and the first matching unit 25 (second matching unit 35) is shown in FIG. 6 (a), and the second filter 26 (fourth filter 36) is formed by connecting the parallel line type distributed constant circuit of FIG. 6 (c) in series. The first filter 24 and the second filter 26 are BPFs.

  A resistor 27 for adjusting the gain of the pass band of the filter type matching circuit is connected between the first matching unit 25 and the second filter 26. The microstrip line 28 allows the resistor 27 to be in phase with the front and rear impedances. The resistor 27 can be replaced with a similar power absorption circuit.

  FIG. 8 is another example of a circuit diagram of the filter type matching circuits 21 to 23 and 31 to 33. This circuit is a BPF formed by connecting parallel line type distributed constant circuits of FIG. 6C in series. Also in the circuit of FIG. 8, a resistor 27 for adjusting the gain of the pass band of the filter type matching circuit and a microstrip line 28 for matching the phase with the impedance before and after the resistor 27 are connected. In such a circuit, it is possible to conceal the influence of impedance from a band other than the pass band by the resonance frequency of the parallel line type distributed constant circuit and to perform impedance conversion before and after this circuit.

FIG. 9 is another example of a circuit diagram of the filter type matching circuits 21 to 23 and 31 to 33. This circuit is composed of the LC series resonance circuit of FIG. 5B and the LC parallel resonance circuit of FIG.
FIG. 10 is another example of a circuit diagram of the filter-type matching circuits 21 to 23 and 31 to 33. This circuit is configured by serially connecting LPFs.
FIG. 11 is another example of a circuit diagram of the filter type matching circuits 21 to 23 and 31 to 33. This circuit is configured by serially connecting HPFs.
9 to 11 are also connected to a resistor 27 for adjusting the gain of the pass band of the filter type matching circuit and a microstrip line 28 for matching the phase with the impedance before and after the resistor 27.

  The simulation results using the amplifying apparatus of the present invention as described above are shown in FIGS.

  12 to 14 show simulation results when two filter type matching circuits are provided before and after the amplifier 10, respectively. The amplifier 10 is composed of one FET. The filter type matching circuit has a pass band of 790 MHz to 840 MHz and 2080 MHz to 2220 MHz, and the impedance can be seen from the amplifier 10 in this band.

  FIG. 12 shows the input reflected power (S11) at the input port 2 of the amplifier and the output reflected power (S22) at the output port 3 at 500 MHz to 3000 MHz. FIG. 13 represents the passing power (S21) from the input port 2 to the output port 3 in addition to S11 and S22 of 750 MHz to 900 MHz of the amplification device. FIG. 14 represents the passing power (S21) from the input port 2 to the output port 3, in addition to S11 and S22 of the amplification device from 1900 MHz to 2400 MHz.

  As can be seen from these simulation results, it can be seen that this amplifying apparatus can obtain a constant gain in a band of 790 MHz to 840 MHz and a band of 2080 MHz to 2220 MHz. Further, the gain is different between the band of 790 MHz to 840 MHz and the band of 2080 MHz to 2220 MHz.

  15 to 18 show simulation results of the amplifying apparatus 1a of FIG. 1 in which three filter type matching circuits are provided before and after the amplifier 10, respectively. The amplifier 10 is composed of one FET. The filter type matching circuit has a bandwidth of 1 GHz and center frequencies of 16.5 GHz, 20.5 GHz, and 24.5 GHz, and the impedance can be seen from the amplifier 10 in this band.

  FIG. 15 shows the input reflected power (S11) at the input port 2 and the output reflected power (S22) at the output port 3 of the amplifier at 14 GHz to 26 GHz. FIG. 16 represents the passing power (S21) from the input port 2 to the output port 3 in addition to S11 and S22 of 15 GHz to 18 GHz of the amplification device. FIG. 17 represents the passing power (S21) from the input port 2 to the output port 3, in addition to S11 and S22 of 19 GHz to 22 GHz of the amplification device. FIG. 18 shows the passing power (S21) from the input port 2 to the output port 3 in addition to S11 and S22 of 23 GHz to 26 GHz of the amplification device.

  As can be seen from these simulation results, it can be seen that this amplifying apparatus can obtain a constant gain in the bandwidth of 1 GHz and the center frequencies of 16.5 GHz, 20.5 GHz, and 24.5 GHz.

  As described above, the amplifying apparatus according to the present invention realizes an amplifying apparatus having a constant gain in a plurality of bands and a different gain for each band.

1 is a configuration diagram of an amplification device according to a first embodiment. FIG. The detailed block diagram of a filter type | mold matching circuit. The detailed block diagram of a filter type | mold matching circuit. The block diagram of the amplifier of 2nd Embodiment. FIG. 5A is an exemplary diagram of a circuit constituting a filter type matching circuit, FIG. 5A is an LC parallel resonance circuit, FIG. 5B is an LC series resonance circuit, and FIG. 5C is an LC parallel resonance circuit. FIG. 5D shows an LC series resonance circuit. FIG. 6A is an exemplary diagram of a circuit constituting a filter type matching circuit, FIG. 6A is an open type distributed constant circuit, FIG. 6B is a short-circuit type distributed constant circuit, and FIG. 6C is a parallel line. FIG. 6D shows a parallel line type distributed constant circuit. The detailed block diagram of a filter type | mold matching circuit. The detailed block diagram of a filter type | mold matching circuit. The detailed block diagram of a filter type | mold matching circuit. The detailed block diagram of a filter type | mold matching circuit. The detailed block diagram of a filter type | mold matching circuit. The figure showing the result of the simulation by the amplifier of this invention. The figure showing the result of the simulation by the amplifier of this invention. The figure showing the result of the simulation by the amplifier of this invention. The figure showing the result of the simulation by the amplifier of this invention. The figure showing the result of the simulation by the amplifier of this invention. The figure showing the result of the simulation by the amplifier of this invention. The figure showing the result of the simulation by the amplifier of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a, 1b Amplifying device 2, 2a, 2b, 2c Input port 3, 3a, 3b, 3c Output port 4 Input end 5 Output end 10 Amplifier 21, 22, 23, 31, 32, 33 Filter type matching circuit 24 1st filter 25 First Matching Section 26 Second Filter 27 Resistance 28 Microstrip Line 34 Third Filter 35 Second Matching Section 36 Fourth Filter

Claims (6)

Amplifying means operable in a predetermined band;
A plurality of at least one of the input and output of the amplifying means, and a matching means for impedance matching only with a specific band within the band of the amplifying means between the amplifying means, and
Each matching means is configured such that the specific band is different.
Amplification equipment. Amplifying means operable in a predetermined band;
A plurality of amplifiers are provided on at least one of the input and output of the amplifying unit to achieve impedance matching between the amplifying unit and a predetermined external device, and to pass a signal in a specific band within the band of the amplifying unit. A filter type matching means,
The specific band is different for each filter type matching means,
Each filter type matching means is configured to act as a load on the amplification means in its specific band.
Amplification equipment. The filter type matching means further includes means for adjusting a gain by the amplification means.
The amplification device according to claim 2. The filter type matching means includes
First filter means for passing a signal of the specific band and impedance matching with the predetermined external device;
Second filter means for passing a signal in the specific band and for impedance matching only with the specific band with the amplifying means;
A matching means for matching the impedance of the first filter means and the second filter means in the specific band, and
Configured to act as a load on the amplification means within the specific band;
The amplification device according to claim 2. At least one of the first filter means, the second filter means, and the matching means is configured by a lumped constant element and / or a distributed constant circuit.
The amplification device according to claim 4. The amplification means has an amplification element,
The filter-type matching means is configured to perform impedance matching with the amplifying element in the specific band of itself.
The amplification device according to claim 2.

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