JPH1056339A - High-frequency amplifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make equipment, provided with the high frequency amplifier, small-sized, lightweight, and low-priced. SOLUTION: On the input side of a power amplifier circuit 40, a high-pass input matching circuit 82 and a low-pass input matching circuit 85 are cascaded; and one transmit input signal between two kind of transmit input signals of different frequency matches by the high-pass input matching circuit 82 and the other transmit input signal matches by the low-pass input matching circuit 85. On the output side of the power amplifier circuit 40, a high-pass output matching circuit 89 and a low-pass output matching circuit 92 are cascaded; and one transmit output signal matches by the high-pass output matching circuit 89 and the other transmit output signal is matched by the low-pass output matching circuit 92.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a mobile phone,
The present invention relates to a high-frequency amplifier suitable for use in a wireless communication device such as a cordless telephone, and more particularly to a high-frequency amplifier in which a plurality of high-frequency signals having different frequencies are matched and amplified by a single amplifier circuit.

[0002]

2. Description of the Related Art Conventionally, mobile communication devices such as mobile phones and cordless phones use radio waves in dedicated frequency bands. Therefore, a high-frequency amplifier that amplifies only a high-frequency signal (transmitted radio wave) in a dedicated frequency band is provided in a transmission device built in a mobile phone or the like.

Here, a conventional high frequency amplifier will be described with reference to FIG.

In FIG. 8, reference numeral 1 denotes a high-frequency amplifier according to the prior art. The high-frequency amplifier 1 is provided, for example, in a transmitting device built in a mobile phone, and has a dedicated frequency used as a transmission radio wave of the mobile phone. This is a dedicated power amplifier for amplifying a high frequency signal in a band. For example, a dedicated frequency band used as a transmission radio wave of the mobile phone is 890 MHz to 915 MHz, and a center frequency is 9 MHz.
In the case of 02.5 MHz, the high-frequency amplifier 1 has a configuration suitable for amplifying only high-frequency signals in such a frequency band.

Reference numeral 2 denotes an input terminal of the high-frequency amplifier 1. The input terminal 2 is built in the mobile phone, and generates a transmission signal for synthesizing a speech signal and a carrier signal and outputting a transmission input signal (high-frequency input signal). It is connected to a circuit or the like (not shown). Then, a transmission input signal output from the transmission signal generation circuit is input to the input terminal 2.

Reference numeral 3 denotes an input matching circuit connected to the input terminal 2 via a coupling capacitor 4.
Is constructed by connecting a coil 5 as an inductance element and a capacitor 6 as a capacitance element in an L-shape, as shown in FIG. Then, the input matching circuit 3 outputs the center frequency (902.5 MHz) of the transmission input signal.
Parameters such as the inductance of the coil 5 and the capacitance of the capacitor 6 are set so as to match z). That is, the parameters of the coil 5 and the capacitor 6 are set so that the reflection coefficient with respect to the center frequency of the transmission input signal is optimized and the input return loss of the high frequency amplifier 1 is minimized.

Reference numeral 7 denotes a power amplifier circuit connected to the output side of the input matching circuit 3, and the power amplifier circuit 7 includes a field effect transistor 8 (hereinafter referred to as "FET 8") for performing power amplification, a bias circuit (not shown), and the like. Approximately. The power amplifying circuit 7 amplifies the transmission input signal matched by the input matching circuit 3 to such an extent that it can be used as a transmission radio wave of a mobile phone (for example, about 1 W). Output to the output matching circuit 9.

Reference numeral 9 denotes an output matching circuit provided on the output side of the power amplifying circuit 7. The output matching circuit 9 includes a coil 10 and a capacitor 1 similar to the input matching circuit 3 described above.
1 are connected in an L-shape. The output matching circuit 9 is set with parameters such as the inductance of the coil 10 and the capacitance of the capacitor 11 so as to match the center frequency (902.5 MHz) of the transmission output signal. That is, the parameters of the coil 10 and the capacitor 11 are set such that the reflection coefficient with respect to the center frequency of the transmission output signal is optimized while considering the output characteristics, the bias condition, the gain, and the like of the power amplifier circuit 7. .

Reference numeral 12 denotes a coupling capacitor for removing a bias current. Reference numeral 13 denotes an output terminal of the high-frequency amplifier 1, and the output terminal 13 is connected to an antenna or the like provided in the mobile phone.

In the high-frequency amplifier 1 according to the prior art configured as described above, a transmission input signal output from the transmission signal generation circuit or the like is amplified to generate a transmission output signal, and the transmission output signal is used as an antenna for a mobile phone. Output to the side. Then, the transmission output signal output from the high-frequency amplifier 1 is transmitted as a transmission radio wave from the antenna.

[0011]

By the way, in the above-mentioned prior art, the frequency band of the transmission radio wave used in the portable telephone is one kind, and the center frequency thereof is, for example, 902.5.
MHz and unity. Therefore, the input matching circuit 3 of the high-frequency amplifier 1 according to the prior art has a center frequency of 902.5M.
Hz, and the output matching circuit 9 has a center frequency of 902.5 MHz.
Is set so as to match only the transmission output signal of

[0012] However, the frequency band of the transmitted radio wave may be different in different regions where the mobile phone is used. For example, the frequency band of a transmission radio wave in a certain area is 890M
Hz to 915 MHz, and the frequency band of a transmission radio wave in another region may be 1430 MHz to 1450 MHz. For this reason, in order to realize a shared mobile phone that can communicate in a plurality of regions, it is necessary to handle at least two types of transmission radio waves (transmission signals) having different frequency bands.

Therefore, in order to amplify two types of transmission signals having different frequency bands in such a common-type mobile phone, as shown in FIG. 9, matching is performed for a frequency band in a certain area. First high frequency amplifier 21
And a second high-frequency amplifier 22 configured to match with respect to a frequency band in another region are provided in parallel, and changeover switches 23 and 23 are provided on the input side and the output side of each of the high-frequency amplifiers 21 and 22, respectively. Configurations are possible.

However, in such a configuration, it is necessary to provide two high-frequency amplifiers 21 and 22 and changeover switches 23 and 23, so that the size of a circuit board for mounting them is increased, and It is difficult to reduce the size and weight, and the number of parts increases, which causes a problem of increasing the cost.

The present invention has been made in view of the above-mentioned problems of the prior art. The present invention can amplify two kinds of high-frequency signals having different frequencies, and can reduce the size, weight, and cost of equipment provided with the high-frequency amplifier. It is an object of the present invention to provide a high-frequency amplifier capable of contributing to the development of a high-frequency amplifier.

[0016]

According to a first aspect of the present invention, there is provided a first input matching circuit for matching a first high frequency input signal, and a first input matching circuit for matching the first high frequency input signal. A second input matching circuit connected in series to an output side of the second input matching circuit for matching a second high frequency input signal having a frequency different from that of the first high frequency input signal; and a second input matching circuit connected to an output side of the second input matching circuit. Amplifying the first high-frequency input signal matched by the first input matching circuit,
A high-frequency output signal, or an amplifier that amplifies a second high-frequency input signal that has been matched by the second input matching circuit and outputs a second high-frequency output signal; and an output of the amplifier circuit. And a first output matching circuit connected to the output side of the first high-frequency output signal and connected in series to the output side of the first high-frequency output signal to perform matching on the second high-frequency output signal. And a second output matching circuit.

As described above, by connecting the first input matching circuit and the second input matching circuit in series, the first input matching circuit is connected to the first input matching circuit.
And the second high-frequency input signal can be matched.

That is, the first high-frequency input signal and the second high-frequency input signal have different frequencies from each other. For this reason, in order to match each of the high-frequency input signals so that the input return loss is minimized, the reflection coefficient of the first high-frequency input signal and the second high-frequency input signal must be adjusted at the input side of the amplifier circuit. Must be optimally set.

Therefore, the first input matching circuit sets an optimum reflection coefficient for the first high-frequency input signal, and the second input matching circuit sets an optimum reflection coefficient for the second high-frequency input signal. By connecting the input matching circuits in series, it is possible to match two types of high frequency input signals having different frequencies.

On the other hand, by connecting the first output matching circuit and the second output matching circuit in series, it is possible to match both the first high-frequency output signal and the second high-frequency output signal. .

That is, since the first high-frequency output signal and the second high-frequency output signal have different frequencies from each other, matching of each high-frequency output signal requires the first high-frequency output signal on the output side of the amplifier circuit. It is necessary to optimally set the reflection coefficient for the output signal and the reflection coefficient for the second high-frequency output signal in consideration of the output characteristics, bias conditions, gain, and the like of the amplifier circuit.

Therefore, the first output matching circuit sets an optimum reflection coefficient for the first high-frequency output signal, and the second output matching circuit sets an optimum reflection coefficient for the second high-frequency output signal. By connecting the respective output matching circuits in series, it is possible to match two types of high-frequency output wave signals having different frequencies with a single high-frequency amplifier.

According to a second aspect of the present invention, the first input matching circuit and the second input matching circuit are low-pass filter type matching circuits, and the first output matching circuit and the second output matching circuit are low. That is, a matching circuit of a band-pass filter type is provided.

According to the above configuration, first, the parameters of the circuit elements constituting the first input matching circuit are set so that the reflection coefficient for the first high-frequency input signal is optimized.
The parameters of the circuit elements constituting the second input matching circuit are set so that the reflection coefficient of the second high-frequency input signal is optimized. Then, the first input matching circuit and the second input matching circuit are connected in series. At this time, the circuit characteristics of the first input matching circuit and the circuit characteristics of the second input matching circuit depend on each other, and the reflection coefficient of each high-frequency input signal set by each input matching circuit changes. For this reason, after the first input matching circuit and the second input matching circuit are connected in series, each input matching circuit is configured such that the respective reflection coefficients for each high-frequency input signal are simultaneously optimized. Adjust the parameters of the circuit elements. In this way, it is possible to easily match two types of high frequency input signals having different frequencies.

On the other hand, the parameters of the circuit elements constituting the first output matching circuit are set so that the reflection coefficient for the first high-frequency output signal is optimized, and the reflection coefficient for the second high-frequency output signal is set. So that the second
The parameters of the circuit elements constituting the output matching circuit are set. Then, the first output matching circuit and the second output matching circuit are connected in series. At this time, the circuit characteristics of the first output matching circuit and the circuit characteristics of the second output matching circuit depend on each other, and the reflection coefficient for each high-frequency output signal set by each output matching circuit changes. For this reason, after the first output matching circuit and the second output matching circuit are connected in series, each output matching circuit is configured such that the respective reflection coefficients of the high frequency output signals are simultaneously optimized. Adjust the parameters of the circuit elements. In this way, it is possible to easily match two types of high-frequency output signals having different frequencies.

According to a third aspect of the present invention, the first input matching circuit and the second input matching circuit are high-pass filter type matching circuits, and the first output matching circuit and the second output matching circuit. Even with the configuration in which the matching circuit is a high-pass filter type matching circuit, it is possible to easily match two types of high-frequency output signals having different frequencies in substantially the same manner as in the second aspect of the present invention.

According to a fourth aspect of the present invention, the first input matching circuit performs matching on the first high-frequency input signal, and
A high-pass filter type matching circuit that passes a second high-frequency input signal having a higher frequency than the high-frequency input signal of
The second input matching circuit is a low-pass filter-type matching circuit that matches the second high-frequency input signal and passes the first high-frequency input signal.

According to the above configuration, since the first input matching circuit is a high-pass filter type matching circuit, the first input matching circuit has a second high frequency having a higher frequency than the first high frequency input signal. It has the same frequency characteristics as a so-called high-pass filter (HPF) that passes an input signal as it is. Therefore, in order to match the first high-frequency input signal, the parameters of the circuit elements constituting the first input matching circuit (for example, the inductance of the coil and the capacitance of the capacitor) are changed and the first high-frequency input signal is changed. Even if the reflection coefficient is adjusted, the reflection coefficient for the second high-frequency input signal set by the second input matching circuit hardly changes.

Further, since the second input matching circuit is a low-pass filter type matching circuit, the second input matching circuit has a first high-frequency input signal having a lower frequency than the second high-frequency input signal. Has the same frequency characteristics as a so-called low-pass filter (LPF). Therefore, in order to match the second high frequency input signal,
Even if the parameters of the circuit elements constituting the second input matching circuit are changed and the reflection coefficient for the second high-frequency input signal is adjusted, the first high-frequency signal set by the second input matching circuit is thereby adjusted. The reflection coefficient for the input signal hardly changes.

As described above, since the first input matching circuit and the second input matching circuit do not depend on each other, the setting of the reflection coefficient by the first input matching circuit and the setting of the reflection coefficient by the second input matching circuit Can be set independently of each other, and the two types of high-frequency input signals having different frequencies can be more easily matched.

According to a fifth aspect of the present invention, the first input matching circuit matches the first high-frequency input signal to obtain a second high-frequency input signal having a lower frequency than the first high-frequency input signal. A high-pass filter-type matching circuit that matches the second high-frequency input signal and passes the first high-frequency input signal. Thus, the same operation as the invention according to claim 4 is exerted.

According to a sixth aspect of the present invention, the first output matching circuit performs matching on the first high-frequency output signal, and
A high-pass filter type matching circuit that passes a second high-frequency output signal having a higher frequency than the high-frequency output signal of
The second output matching circuit is a low-pass filter type matching circuit that matches the second high-frequency output signal and passes the first high-frequency output signal.

According to the above configuration, since the first output matching circuit is a high-pass filter type matching circuit, the first output matching circuit has a second high frequency having a higher frequency than the first high frequency output signal. It has the same frequency characteristics as a so-called high-pass filter that passes an output signal as it is. Therefore,
To match the first high frequency output signal, the first
Even if the parameters of the circuit elements constituting the output matching circuit are changed and the reflection coefficient of the first high-frequency output signal is adjusted, the second high-frequency output signal set by the second output matching circuit is thereby adjusted. Does not change substantially.

Also, since the second output matching circuit is a low-pass filter type matching circuit, the second output matching circuit outputs the first high-frequency output signal having a lower frequency than the second high-frequency output signal. It has the same frequency characteristics as a so-called low-pass filter that passes as it is. Therefore, in order to match the second high-frequency output signal, the parameters of the circuit elements constituting the second output matching circuit are changed,
Even if the reflection coefficient of the high-frequency output signal is adjusted, the first output matching circuit sets the first output matching circuit.
Of the high-frequency output signal of FIG.

As described above, since the first output matching circuit and the second output matching circuit do not depend on each other, the setting of the reflection coefficient by the first output matching circuit and the setting of the reflection coefficient by the second output matching circuit are not performed. Can be set independently of each other, and the two types of high-frequency output signals having different frequencies can be more easily matched.

According to a seventh aspect of the present invention, the first output matching circuit matches the first high-frequency output signal to obtain a second high-frequency output signal having a lower frequency than the first high-frequency output signal. And a second output matching circuit that matches the second high-frequency output signal and passes the first high-frequency output signal. Thus, the same operation as the invention according to claim 6 is exerted.

[0037]

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

First, an example in which the high-frequency amplifier according to the first embodiment of the present invention is applied to a high-frequency amplifier for amplifying a transmission signal of a shared-type mobile phone will be described with reference to FIG.

In FIG. 1, reference numeral 31 denotes a high-frequency amplifier according to the present embodiment. The high-frequency amplifier 31 is provided, for example, in a common-use portable telephone for transmitting two types of transmission radio waves having different frequency bands. This is a high-frequency power amplifier for amplifying two types of transmission signals (high-frequency signals) having different frequency bands used as a power supply. For example, the frequency band of a transmission radio wave used in a certain area is 890 MHz to 91 MHz.
5 MHz, the center frequency f1 is 902.5 MHz, and the frequency band of the transmission radio wave used in other regions is 1
430 MHz to 1450 MHz, and its center frequency f2
Is 1440 MHz, the high-frequency amplifier 31
Is configured to be optimal for amplifying both the transmission signal of the center frequency f1 and the transmission signal of the center frequency f2.

Reference numeral 32 denotes an input terminal of the high-frequency amplifier 31. The input terminal 32 is connected to a transmission signal generation circuit or the like (not shown) of a common type portable telephone. For example, transmission input signals as two types of high-frequency input wave signals having different frequency bands are input. That is, the center frequency f1 (902.5
MHz) and a center frequency f2 (14
(40 MHz). 33 is an input side of the high-frequency amplifier 31 and is a transmission input signal A
It is a coupling capacitor for removing the DC component of A1 and A2.

Reference numeral 34 denotes a coupling capacitor 33 connected to the input terminal 32.
And a first low-pass filter type input matching circuit (hereinafter, referred to as a matching circuit) for matching the transmission input signal A1.
This is referred to as a “low-pass input matching circuit 34”. The low-pass input matching circuit 34 is provided in the middle of a signal line extending from the input terminal 32 to a gate terminal of a field-effect transistor 41 described later. A coil 35 is provided as an inductance element provided, and a capacitor 36 is provided between the signal line and the ground as a capacitance element. That is, the low-pass input matching circuit 34 has substantially the same circuit configuration as a so-called low-pass filter (LPF) in which the coil 35 and the capacitor 36 are connected in an L-shape.

The low-pass type input matching circuit 34
The parameters such as the inductance of the coil 35 and the capacitance of the capacitor 36 are set so as to match the center frequency f1 of the transmission input signal A1. That is,
The parameters of the coil 35 and the capacitor 36 are set so that the reflection coefficient of the transmission input signal A1 with respect to the center frequency f1 is optimized and the input return loss is minimized.

Reference numeral 37 denotes a second low-pass filter type input matching circuit (hereinafter, referred to as "low-pass filter") which is connected in series to the output side of the low-pass input matching circuit 34 and matches the transmission input signal A2. Type input matching circuit 37 ").
The low-pass input matching circuit 37 includes a coil 38 as an inductance element and a capacitor 39 as a capacitance element, similarly to the low-pass input matching circuit 34 described above.
Are connected in an L-shape. That is,
The low-pass input matching circuit 37 has substantially the same circuit configuration as a so-called low-pass filter.

Then, the low-pass input matching circuit 37
The parameters such as the inductance of the coil 38 and the capacitance of the capacitor 39 are set so as to match the center frequency f2 of the transmission input signal A2. That is,
The parameters of the coil 38 and the capacitor 39 are set so that the reflection coefficient of the transmission input signal A2 with respect to the center frequency f2 is optimized and the input return loss is minimized.

The circuit characteristics of the low-pass input matching circuit 34 and the circuit characteristics of the low-pass input matching circuit 37 are as follows.
Depend on each other. Therefore, the low-pass input matching circuit 3
4 and the parameters of the coil 38 and the capacitor 39 provided in the low-pass input matching circuit 37 simultaneously match the transmission input signals A1 and A2. It is set while adjusting as follows.

Reference numeral 40 denotes a power amplification circuit connected to the output side of the low-pass input matching circuit 37.
0 is a field-effect transistor 41 that performs power amplification (hereinafter, referred to as a
An input-side bias circuit 42 for setting a bias voltage on the input side of the FET 41;
An output side bias circuit 43 for setting a bias voltage on the output side of T41 and the like are roughly constituted. Each of the bias circuits 42 and 43 is configured by connecting a DC power supply 44, a choke coil 45, and a bypass capacitor 46 as shown in FIG.

The power amplification circuit 40 transmits the transmission input signal A matched by the low-pass input matching circuit 34.
1 and the transmission input signal A2 matched by the low-pass type input matching circuit 37 are amplified to a level (for example, about 1 W) that can be used as each transmission radio wave of the mobile phone, and the result is transmitted to the transmission output signal B1. , B2 to a low-pass output matching circuit 47 described later. That is, the power amplification circuit 40 amplifies the transmission input signal A1 to output a transmission output signal B1 having a center frequency f1, and amplifies the transmission input signal A2 to output a transmission output signal B2 having a center frequency f2.

Although the FET 41 is provided in the power amplification circuit 40, another active element such as a bipolar transistor may be used instead of the FET 41. Also,
Although the power amplification circuit 40 is configured as a one-stage amplifier including a single FET 41, it may be a multi-stage amplifier including a plurality of FETs, transistors, and the like.

Reference numeral 47 denotes a first low-pass filter type output matching circuit (hereinafter referred to as a "low-pass type output matching circuit 47") connected to the output side of the power amplifier circuit 40 and matching the transmission output signal B1. ), The low-pass type output matching circuit 47 includes a coil 48 as an inductance element provided in the middle of a signal line extending from the drain terminal of the FET 41 toward the output terminal 54 described later, And a capacitor 49 as a capacitive element provided between the ground and the ground. That is, the low-pass output matching circuit 47 has substantially the same circuit configuration as a so-called low-pass filter (LPF) in which a coil 48 and a capacitor 49 are connected in an L-shape.

The low-pass type output matching circuit 47
The parameters such as the inductance of the coil 48 and the capacitance of the capacitor 49 are set so as to match the center frequency f1 of the transmission output signal B1. That is, the parameters of the coil 48 and the capacitor 49 are set such that the reflection coefficient of the transmission output signal B1 with respect to the center frequency f1 is optimized while considering the output characteristics, bias conditions, gain, and the like of the power amplification circuit 40. I have.

Reference numeral 50 denotes a second low-pass filter type output matching circuit (hereinafter, referred to as "low-pass filter") which is connected in series to the output side of the low-pass output matching circuit 47 and matches the transmission output signal B2. Type output matching circuit 50 ”).
The low-pass output matching circuit 50 includes a coil 51 as an inductance element and a capacitor 52 as a capacitance element, similarly to the low-pass output matching circuit 47 described above.
Are connected in an L-shape. That is,
The low-pass input matching circuit 50 has substantially the same circuit configuration as a so-called low-pass filter. In the low-pass type output matching circuit 50, parameters such as the inductance of the coil 51 and the capacitance of the capacitor 52 are set so as to match the center frequency f2 of the transmission output signal B2. That is, while considering the output characteristics, bias conditions, gain, and the like of the power amplification circuit 40, the reflection coefficient of the transmission output signal B2 with respect to the center frequency f2 is optimized.
Each parameter of the coil 51 and the capacitor 52 is set.

The circuit characteristics of the low-pass output matching circuit 47 and the circuit characteristics of the low-pass output matching circuit 50 depend on each other. For this reason, the low-pass type output matching circuit 47
And the parameters of the coil 51 and the capacitor 52 provided in the low-pass type output matching circuit 50 so as to simultaneously match both the transmission output signals B1 and B2. It is set while adjusting.

Reference numeral 53 denotes a coupling capacitor for removing a bias current. An output terminal 54 of the high-frequency amplifier 31 is connected to the antenna side of the mobile phone.

The high-frequency amplifier 31 according to the present embodiment has the above-described configuration.
According to No. 1, when the transmission input signal A1 is output from the transmission signal generation circuit or the like to the input terminal 32, the low-pass input matching circuit 34 mainly matches the transmission input signal A1, and the power amplification circuit 40 The transmission input signal A1 is amplified to output a transmission output signal B1. Then, the low-pass type output matching circuit 47 mainly matches the transmission output signal B1 and outputs the transmission output signal B1 from the output terminal 54 to the antenna side of the shared mobile phone.

On the other hand, when the transmission input signal A2 is output from the transmission signal generation circuit or the like to the input terminal 32, the low-pass input matching circuit 37 mainly matches the transmission input signal A2, and the power amplifier circuit 40 The transmission input signal A2 is amplified to output a transmission output signal B2. Then, the low-pass type output matching circuit 50 mainly matches the transmission output signal B2 and outputs the transmission output signal B2 to the output terminal 54.
Output to the antenna side of the common mobile phone.

Here, how the high-frequency amplifier 31 matches transmission input signals A1 and A2 and transmission output signals B1 and B2 will be described.

First, the matching of the transmission input signals A1 and A2 will be described.
2 have different frequencies from each other, so that these transmission input signals A
In order to match the input return loss with respect to 1 and A2, the reflection coefficient of the transmission input signal A1 and the reflection coefficient of the transmission input signal A2 are optimized on the input side of the power amplifier circuit 40. Must be set to

Therefore, the low-pass input matching circuit 34
The coil 3 constituting the low-pass type input matching circuit 34 has an optimum reflection coefficient for the transmission input signal A1.
5. Each parameter of the capacitor 36 is set. Also,
The low-pass input matching circuit 37 sets the parameters of the coil 38 and the capacitor 39 constituting the low-pass input matching circuit 37 so that the transmission input signal A2 has an optimal reflection coefficient. Then, the low-pass input matching circuits 34 and 37 are connected in series, and the low-pass input matching circuit 3 is connected.
The parameters of the coil 35 and the capacitor 36 of the low-pass input matching circuit 34 and the coil 38 of the low-pass input matching circuit 37 are removed so that the circuit characteristics of the input and output circuits 4 and 37 do not depend on each other. Each parameter of the capacitor 39 is adjusted.

As a result, it is possible to match the transmission input signals A1 and A2 having different frequencies so that the input return loss is minimized.

Next, the point of matching transmission output signals B1 and B2 will be described. Since transmission output signal B1 and transmission output signal B2 have different frequencies from each other, it is necessary to match transmission output signals B1 and B2. On the output side of the power amplifying circuit 40, the reflection coefficient for the transmission output signal B1 and the reflection coefficient for the transmission output signal B2 are respectively determined while considering the output characteristics, the bias condition, the gain, and the like of the power amplification circuit 40. It must be set optimally.

Therefore, in the low-pass output matching circuit 47, the parameters of the coil 48 and the capacitor 49 constituting the low-pass output matching circuit 47 are set so that the transmission output signal has an optimum reflection coefficient. . Further, the low-pass type output matching circuit 50 sets each parameter of the coil 51 and the capacitor 52 constituting the low-pass type output matching circuit 50 so that the transmission output signal B2 has an optimal reflection coefficient. And a low-pass output matching circuit 4
7, 50 in series, and a low-pass output matching circuit 4
The coil 48 of the low-pass type output matching circuit 47, the parameters of the capacitor 49, the coil 51 of the low-pass type output matching circuit 50, Each parameter of the capacitor 52 is adjusted.

This makes it possible to easily match the transmission output signals B1 and B2 having different frequencies so that the gain becomes maximum.

Thus, according to the present embodiment, on the input side of the high-frequency amplifier 31, the low-pass input matching circuit 34
And the low-pass input matching circuit 37 are connected in series, and on the output side, the low-pass output matching circuit 47 and the low-pass output matching circuit 50 are connected in series. Can be amplified with optimal characteristics.

With this configuration, it is possible to amplify two types of transmission signals having different frequencies by providing only one high-frequency amplifier 31 according to the present embodiment in a common-use portable telephone, as in the prior art (FIG. 8). , Two high-frequency amplifiers 21 and
2. It is not necessary to provide each changeover switch 23 and the like. Therefore, it is possible to reduce the size, weight, and cost of a mobile phone or the like provided with the high-frequency amplifier 31.

Next, an example in which the high-frequency amplifier according to the second embodiment of the present invention is applied to a high-frequency amplifier for amplifying a transmission signal of a shared-type mobile phone will be described with reference to FIG. The feature of the present embodiment is that the first input matching circuit, the second input matching circuit, the first output matching circuit, and the second output matching circuit are each configured by a high-pass filter type matching circuit. is there. In this embodiment, the same reference numerals are given to the same components as those of the above-described first embodiment, and description thereof will be omitted.

In FIG. 2, reference numeral 61 denotes a high-frequency amplifier according to the present embodiment. Reference numeral 62 denotes a first high-pass filter-type input matching circuit (hereinafter, referred to as a “high-pass input matching circuit”) connected to the input terminal 32 and matching the transmission input signal A1 having the center frequency f1 (for example, 902.5 MHz). 62, and the high-pass input matching circuit 62 includes a capacitor 63 as a capacitive element provided in the middle of a signal line extending from the input terminal 32 side to the gate terminal side of the FET 41; And a coil 64 provided as an inductance element provided between the ground and the ground, that is, the high-pass input matching circuit 62 is configured by connecting the capacitor 63 and the coil 64 in an L-shape. The circuit configuration is almost the same as that of a so-called high-pass filter (HPF).

Then, the high-pass type input matching circuit 62
The parameters such as the capacity of the capacitor 63 and the inductance of the coil 64 are set so as to match the center frequency f1 of the transmission input signal A1.

Reference numeral 65 is connected in series to the output side of the high-pass type input matching circuit 62, and has a center frequency f2 (for example, 14
A second high-pass filter-type input matching circuit (hereinafter, referred to as a “high-pass input matching circuit 65”) that matches the transmission input signal A2 of 40 MHz) is shown. Is a capacitor 66 as a capacitive element, substantially similar to the high-pass input matching circuit 62 described above.
And the coil 67 as an inductance element are connected in an L-shape. That is, the high-pass input matching circuit 65 has substantially the same circuit configuration as a so-called high-pass filter.

Then, the high-pass type input matching circuit 65
The parameters such as the capacitance of the capacitor 66 and the inductance of the coil 67 are set so as to match the center frequency f2 of the transmission input signal A2.

The circuit characteristics of the high-pass input matching circuit 62 and the circuit characteristics of the high-pass input matching circuit 65 depend on each other. Therefore, the high-pass input matching circuit 62
The parameters of the capacitor 63 and the coil 64 provided in the high-pass input matching circuit 65 and the parameters of the capacitor 66 and the coil 67 provided in the high-pass input matching circuit 65 are used to simultaneously match the transmission input signals A1 and A2. It is set while adjusting.

Reference numeral 68 denotes a first high-pass filter type output matching circuit (hereinafter referred to as "high-pass type output matching circuit 68") which is connected to the output side of the power amplifier circuit 40 and matches the transmission output signal B2. ), And the high-pass output matching circuit 68 is connected to the output terminal 5 from the drain terminal of the FET 41.
It comprises a capacitor 69 as a capacitive element provided in the middle of a signal line extending toward the fourth side, and a coil 70 as an inductance element provided between the signal line and the ground. That is, the high-pass output matching circuit 68 has a circuit configuration substantially similar to that of a so-called high-pass filter.

Then, the high-pass output matching circuit 68
The parameters such as the capacitance of the capacitor 69 and the inductance of the coil 70 are set so as to match the center frequency f2 of the transmission output signal B2.

Reference numeral 71 denotes a second high-pass filter type output matching circuit (hereinafter referred to as "high-pass filter") which is connected in series to the output side of the high-pass output matching circuit 68 and matches the transmission output signal B2. Type output matching circuit 71 ”).
The high-pass output matching circuit 71 includes a capacitor 72 as a capacitive element and a coil 73 as an inductance element, similarly to the high-pass output matching circuit 68 described above.
Are connected in an L-shape. That is,
The high-pass output matching circuit 71 has substantially the same circuit configuration as a so-called high-pass filter.

Then, the high-pass output matching circuit 71
The parameters such as the capacitance of the capacitor 72 and the inductance of the coil 73 are set so as to match the center frequency f2 of the transmission output signal B2.

The circuit characteristics of the high-pass output matching circuit 68 and the circuit characteristics of the high-pass output matching circuit 71 depend on each other. Therefore, the high-pass output matching circuit 68
And the parameters of the capacitor 72 and the coil 73 provided in the high-pass type output matching circuit 71 so that the transmission output signals B1 and B2 are both matched at the same time. It is set while adjusting.

The high-frequency amplifier 61 according to the present embodiment has the above-described configuration, and the high-frequency amplifier 61 can also optimize two types of transmission signals having different frequencies similarly to the first embodiment. Amplification can be performed with characteristics, and the size, weight, and cost of a mobile phone or the like provided with the high-frequency amplifier 61 can be reduced.

Next, a case where the high-frequency amplifier according to the third embodiment of the present invention is applied to a high-frequency amplifier for amplifying a transmission signal of a shared-type mobile phone will be described as an example with reference to FIGS. . The feature of this embodiment is that the first input matching circuit is constituted by a high-pass filter type matching circuit,
The second input matching circuit is configured by a low-pass filter type matching circuit, the first output matching circuit is configured by a high-pass filter type matching circuit, and the second output matching circuit is configured by a low-pass filter. It is constituted by a type matching circuit. In this embodiment, the same components as those of the first embodiment described above are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 3, reference numeral 81 denotes a high-frequency amplifier according to the present embodiment. A high-pass filter-type input matching circuit 82 (hereinafter, referred to as a “high-pass input matching circuit 82”) is connected to the input terminal 32 and matches the transmission input signal A1 having the center frequency f1 (for example, 902.5 MHz). )
And the high-pass input matching circuit 82 has an input terminal 3
A capacitor 83 as a capacitive element provided in the middle of a signal line extending from the second side to the gate terminal side of the FET 41
And a coil 84 as an inductance element provided between the signal line and the ground. That is, the high-pass input matching circuit 82
And a coil 84 connected in an L-shape, which is almost the same as a so-called high-pass filter (HPF).

The high-pass type input matching circuit 82
The parameters such as the capacitance of the capacitor 83 and the inductance of the coil 84 are set so as to match the center frequency f1 of the transmission input signal A1.

The high-pass type input matching circuit 82
It has a frequency characteristic as shown by a characteristic line α1 in FIG.
That is, the center frequency f1 of the transmission input signal A1 (902.5
When the respective parameters of the capacitor 83 and the coil 84 are set so as to achieve matching with respect to (MHz), the high-pass type input matching circuit 82 sets the center frequency f1
It has the characteristic of passing a higher frequency band.

Here, as described above, the transmission input signal A
The center frequency f1 of 1 is, for example, 902.5 MHz,
The center frequency f2 of the transmission input signal A2 is, for example, 1440 M
Hz, and the center frequency f2 of the transmission input signal A2 is higher than the center frequency f1 of the transmission input signal A1. As a result,
As shown in FIG. 4, the center frequency f2 of the transmission input signal A2
Are in the pass band in the frequency characteristics of the high-pass input matching circuit 82. Therefore, the high-pass type input matching circuit 8
2 matches the transmission input signal A1 and passes the transmission input signal A2 as it is.

An input matching circuit 85 is connected in series to the output side of the high-pass input matching circuit 82 and matches a transmission input signal A2 having a center frequency f2. The low-pass input matching circuit 85 is a coil as an inductance element provided in the middle of a signal line extending from the input terminal 32 side to the gate terminal side of the FET 41. 86, and a capacitor 87 as a capacitive element provided between the signal line and the ground. That is, the low-pass input matching circuit 85
6 and a capacitor 87 connected in an L-shape, which is almost the same as a so-called low-pass filter (LPF).

The low-pass type input matching circuit 85
The parameters such as the inductance of the coil 86 and the capacitance of the capacitor 87 are set so as to match the center frequency f2 of the transmission input signal A2.

The low-pass input matching circuit 85
It has a frequency characteristic as shown by a characteristic line α2 in FIG.
That is, the center frequency f2 of the transmission input signal A2 (1440M
When the parameters of the coil 86 and the capacitor 87 are set so as to achieve matching with respect to (Hz), the low-pass input matching circuit 85 has a characteristic of passing a frequency band lower than the center frequency f2 of the transmission input signal A2. . As a result, as shown in FIG. 4, the center frequency f1 of the transmission input signal A1 becomes a pass band in the frequency characteristics of the low-pass input matching circuit 85. Accordingly, the low-pass input matching circuit 85 matches the transmission input signal A2 and passes the transmission input signal A1 as it is.

Reference numeral 89 denotes a high-pass filter type output matching circuit (hereinafter, referred to as a "high-pass type output matching circuit 89") connected to the output side of the power amplifier circuit 40 and matching the transmission output signal B1. , The high-pass type output matching circuit 8
9 is configured by connecting a capacitor 90 and a coil 91 in an L-shape almost in the same manner as the high-pass input matching circuit 82 described above. That is, the high-pass output matching circuit 89 has a circuit configuration substantially similar to that of a so-called high-pass filter.

Then, the high-pass type output matching circuit 89
The parameters such as the capacitance of the capacitor 90 and the inductance of the coil 91 are set so as to match the center frequency f1 of the transmission output signal B1.

The frequency characteristics of the high-pass output matching circuit 89 are substantially the same as the frequency characteristics of the high-pass input matching circuit 82 (characteristic line α1 in FIG. 4). That is,
The high-pass output matching circuit 89 controls the capacitor 9 so as to match the center frequency f1 of the transmission output signal B1.
0, by setting each parameter of the coil 91,
The characteristic is such that a frequency band higher than the center frequency f1 of the transmission output signal B1 is passed. Thereby, the high-pass type output matching circuit 89 matches the transmission output signal B1 and passes the transmission output signal B2 as it is.

Reference numeral 92 denotes a low-pass filter-type output matching circuit (hereinafter, referred to as a high-pass type output matching circuit 89) which is connected in series to the output side of the high-pass type output matching circuit 89 and matches the transmission output signal B2.
This is referred to as a “low-pass output matching circuit 92”, and the low-pass output matching circuit 92 includes a coil 93 and a capacitor 9 similar to the low-pass input matching circuit 85 described above.
4 are connected in an L-shape. That is, the low-pass type output matching circuit 92 has substantially the same circuit configuration as a so-called low-pass filter.

The low-pass type output matching circuit 92
The parameters such as the inductance of the coil 93 and the capacitance of the capacitor 94 are set so as to match the center frequency f2 of the transmission output signal B2.

The frequency characteristics of the low-pass type output matching circuit 92 are almost the same as the frequency characteristics of the low-pass type input matching circuit 85 (characteristic line α2 in FIG. 4). That is,
The low-pass type output matching circuit 92 matches the coil 93, so that the center frequency f2 of the transmission output signal B2 is matched.
By setting each parameter of the capacitor 94,
The characteristic is such that a frequency band lower than the center frequency f2 of the transmission output signal B2 is passed. Thereby, the low-pass output matching circuit 92 matches the transmission output signal B2 and passes the transmission output signal B1 as it is.

The high-frequency amplifier 81 according to the present embodiment has the above-described configuration.
Thus, in the same manner as the high-frequency amplifier 31 according to the above-described first embodiment, two types of transmission signals having different frequencies can be amplified with optimal characteristics, respectively. Weight, weight, and cost can be reduced.

Further, the high-frequency amplifier 81 according to the present embodiment
Then, as shown in FIG. 4, a high-pass input matching circuit 82 having a frequency characteristic of passing a high frequency band,
A low-pass input matching circuit 85 having a frequency characteristic of passing a low-frequency band is connected in series. Thereby, the high-pass type input matching circuit 82 matches the transmission input signal A1 and sets the transmission input signal A2.
Can be passed as it is, and the low-pass input matching circuit 85 can match the transmission input signal A2 and pass the transmission input signal A1 as it is. Thus, the circuit characteristics of the high-pass input matching circuit 82 and the circuit characteristics of the low-pass input matching circuit 85 do not depend on each other.

Therefore, in order to match the transmission input signal A1, the parameters of the capacitor 83 and the coil 84 provided in the high-pass type input matching circuit 82 are changed.
Even if the reflection coefficient of the transmission input signal A1 is adjusted, the reflection coefficient of the transmission input signal A2 set by the low-pass input matching circuit 85 hardly changes. Similarly, the transmission input signal A
Even if the parameters of the coil 86 and the capacitor 87 provided in the low-pass type input matching circuit 85 are changed in order to achieve the matching for the transmission input signal A2 and the reflection coefficient of the transmission input signal A2 is adjusted, The reflection coefficient of the transmission input signal A1 set by the band-pass input matching circuit 82 hardly changes.

Here, FIG. 5 shows how the gain of the high-frequency amplifier 81 changes when the capacitance value of the capacitor 87 provided in the low-pass input matching circuit 85 of the high-frequency amplifier 81 according to the present embodiment is changed. It shows how it changes. That is, the characteristic line β1 in FIG. 5 shows the gain characteristic of the high-frequency amplifier 81 before changing the capacitance value of the capacitor 87, and the characteristic line β2 shows the gain characteristic after changing the capacitance value of the capacitor 87. . According to this figure, by changing the capacitance value of the capacitor 87 provided in the low-pass input matching circuit 85, the gain characteristic near the center frequency f2 of the transmission input signal A2 changes as shown by the arrow R1. ing.
However, the gain characteristic around the center frequency f1 of the transmission input signal A1 has not changed.

FIG. 6 shows that the input return loss characteristic of the high-frequency amplifier 81 changes when the capacitance value of the capacitor 87 provided in the low-pass input matching circuit 85 of the high-frequency amplifier 81 according to the present embodiment is changed. It shows how it changes. That is, the characteristic line γ1 in FIG. 6 shows the input return loss characteristic of the high-frequency amplifier 81 before changing the capacitance value of the capacitor 87, and the characteristic line γ2 shows the input return loss after changing the capacitance value of the capacitor 87. The loss characteristics are shown. According to this figure, the low-pass input matching circuit 85
, The input return loss characteristic near the center frequency f2 of the transmission input signal A2 changes as indicated by arrow R2.
However, the input return loss characteristic around the center frequency f1 of the transmission input signal A1 has not changed.

That is, according to FIGS. 5 and 6, the circuit characteristics of the high-pass input matching circuit 82
It can be seen that there is independence with respect to the circuit characteristics of No. 5.

As described above, the high-pass type input matching circuit 82
And the low-pass input matching circuit 85 do not depend on each other, so that the setting of the reflection coefficient for the transmission input signal A1 and the setting of the reflection coefficient for the transmission input signal A2 can be performed independently. The design and adjustment of the matching circuits 82 and 85 can be further facilitated.

In the high-frequency amplifier 81 according to the present embodiment, a high-pass output matching circuit 89 having a frequency characteristic of passing a high frequency band and a low-frequency output matching circuit 89 having a frequency characteristic of passing a low frequency band are provided. Pass-through output matching circuit 9
2 is connected in series. Thus, in the high-pass output matching circuit 89, the transmission output signal B1 can be matched and the transmission output signal B2 can be passed as it is, and in the low-pass output matching circuit 92,
The transmission output signal B2 is matched and the transmission output signal B
1 can be passed as it is.

Therefore, in order to match the transmission output signal B1, each parameter of the capacitor 90 and the coil 91 provided in the high-pass output matching circuit 89 is changed.
Even if the reflection coefficient of the transmission output signal B1 is adjusted, the reflection coefficient of the transmission output signal B2 set by the low-pass output matching circuit 92 hardly changes. Similarly, the transmission output signal B
2, the parameters of the coil 93 and the capacitor 94 provided in the low-pass output matching circuit 92 are changed to adjust the reflection coefficient of the transmission output signal B2. The reflection coefficient of the transmission output signal B1 set by the bandpass output matching circuit 89 hardly changes.

As described above, the high-pass type output matching circuit 89
And the low-pass output matching circuit 92 do not depend on each other, the setting of the reflection coefficient for the transmission output signal B1 and the setting of the reflection coefficient for the transmission output signal B2 can be performed independently. The design and adjustment of the matching circuits 89 and 92 can be further facilitated.

Next, an example in which the high-frequency amplifier according to the fourth embodiment of the present invention is applied to a high-frequency amplifier for amplifying a transmission signal of a shared mobile phone will be described with reference to FIG.

That is, the high-frequency amplifier 101 according to the present embodiment
Is characterized in that a center frequency f2 (1440M
Hz), a low-pass filter type input matching circuit 85 for matching the transmission input signal A2 is connected, and a center frequency f1 (902.5 MHz) is provided on the output side of the input matching circuit 85.
A high-pass filter type input matching circuit 82 for matching the transmission input signal A1 is connected in series. A low-pass filter type output matching circuit 92 for matching the transmission output signal B2 is connected to the output side of the power amplification circuit 40, and the transmission output signal B is connected to the output side of the output matching circuit 92.
A high-pass filter type output matching circuit 89 for matching 1 is connected in series.

The high-frequency amplifier 101 configured as described above
Thus, the same operation and effect as those of the high-frequency amplifier 81 according to the third embodiment described above can be obtained.

In each of the above embodiments, the high-frequency amplifier 3
Although the case where 1, 61, 81, and 101 are provided in a common-type mobile phone has been described as an example, the present invention is not limited to this, and is widely applied as a high-frequency amplifier that amplifies two types of high-frequency signals having different frequencies. be able to.

In each of the above embodiments, the high-frequency amplifier 3
1,61,81,101 are described as power amplifiers,
The present invention is not limited to this, and can be applied as a small signal amplifier.

[0106]

As described in detail above, according to the first aspect of the present invention, the first input matching circuit and the second input matching circuit are connected in series, and the first output matching circuit and the second output matching circuit are connected. Since the configuration is such that the output matching circuit is connected in series, it is possible to perform matching and amplify two types of high-frequency signals having different frequencies with a single high-frequency amplifier.

Therefore, unlike the prior art, it is not necessary to provide two high-frequency amplifiers, changeover switches, etc. to amplify two types of high-frequency signals having different frequencies, respectively.
It is possible to reduce the size, weight, and cost of a device provided with the high-frequency amplifier.

According to the second aspect of the present invention, the first input matching circuit and the second input matching circuit are low-pass filter type matching circuits, and the first output matching circuit and the second output matching circuit are used. Since both circuits are low-pass filter type matching circuits, it is possible to easily match two types of high-frequency signals having different frequencies, thereby facilitating the design and adjustment of each matching circuit. it can.

According to a third aspect of the present invention, the first input matching circuit and the second input matching circuit are high-pass filter type matching circuits, and the first output matching circuit and the second output matching circuit are used. The same effects as those of the invention according to claim 2 can be obtained by using the above as a high-pass filter type matching circuit.

According to the fourth aspect of the present invention, the first input matching circuit matches the first high-frequency input signal, and the second high-frequency input signal having a higher frequency than the first high-frequency input signal. And a second input matching circuit for matching the second high-frequency input signal and a low-pass filter type matching for passing the first high-frequency input signal. Since the circuit is used, even if the parameters of the circuit elements constituting the first input matching circuit are changed in order to match the first high-frequency input signal, the matching of the second high-frequency input signal is hardly affected. Absent. Further, even if the parameters of the circuit elements constituting the second input matching circuit are changed in order to match the second high-frequency input signal, the matching of the first high-frequency input signal is hardly affected.

Therefore, the design and adjustment of the first input matching circuit and the design and adjustment of the second input matching circuit can be performed independently, and the design and adjustment of each input matching circuit can be further facilitated. can do.

According to a fifth aspect of the present invention, the first input matching circuit performs matching on the first high-frequency input signal,
A low-pass filter type matching circuit that passes a second high-frequency input signal having a frequency lower than that of the first high-frequency input signal is provided, and a second input matching circuit is matched with respect to the second high-frequency input signal. The same effect as that of the fourth aspect can be obtained even with a high-pass filter type matching circuit that passes the first high-frequency input signal.

According to the sixth aspect of the present invention, the first output matching circuit matches the first high-frequency output signal, and the second high-frequency output signal having a higher frequency than the first high-frequency output signal. And a second output matching circuit that matches the second high-frequency output signal and that matches the low-pass filter that passes the first high-frequency output signal. From the circuit
Even if the parameters of the circuit elements constituting the first output matching circuit are changed to achieve matching of the first high-frequency output signal, the matching of the second high-frequency output signal is hardly affected. Further, even if the parameters of the circuit elements constituting the second output matching circuit are changed so as to match the second high-frequency output signal, the matching of the first high-frequency output signal is hardly affected.

Therefore, the design and adjustment of the first output matching circuit and the design and adjustment of the second output matching circuit can be performed independently, and the design and adjustment of each output matching circuit can be further facilitated. can do.

According to a seventh aspect of the present invention, the first output matching circuit performs matching on the first high-frequency output signal,
A low-pass filter type matching circuit that passes a second high-frequency output signal having a frequency lower than that of the first high-frequency output signal is provided, and a second output matching circuit is matched with respect to the second high-frequency output signal. The same effect as that of the invention according to claim 6 can be obtained even with a high-pass filter type matching circuit that passes the first high-frequency output signal.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a high-frequency amplifier according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a high-frequency amplifier according to a second embodiment of the present invention.

FIG. 3 is a circuit diagram showing a high-frequency amplifier according to a third embodiment of the present invention.

FIG. 4 is a characteristic diagram showing frequency characteristics of a high-pass input matching circuit and a low-pass input matching circuit provided in a high-frequency amplifier according to a third embodiment of the present invention.

FIG. 5 is a characteristic diagram showing gain characteristics of a high-frequency amplifier according to a third embodiment of the present invention.

FIG. 6 is a characteristic diagram showing an input return loss characteristic of a high-frequency amplifier according to a third embodiment of the present invention.

FIG. 7 is a circuit diagram showing a high-frequency amplifier according to a fourth embodiment of the present invention.

FIG. 8 is a circuit diagram showing a high-frequency amplifier according to the related art.

FIG. 9 is a block circuit diagram showing a high-frequency amplifier, a changeover switch, and the like according to the related art.

[Explanation of symbols]

 31, 61, 81, 101 High frequency amplifiers 34, 37, 85 Low pass type input matching circuits 47, 50, 92 Low pass type output matching circuits 40 Power amplifier circuits (amplifier circuits) 62, 65, 82 High pass type Input matching circuit 68, 71, 89 High-pass output matching circuit

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Toshio Nojima 2-10-1 Toranomon, Minato-ku, Tokyo Inside NTT Mobile Communication Network Co., Ltd.

Claims (7)

[Claims] 1. A first input matching circuit for matching a first high-frequency input signal, the first input matching circuit being connected in series to an output side of the first input matching circuit, and having a frequency different from that of the first high-frequency input signal. A second input matching circuit for matching the second high-frequency input signal; and a first high-frequency input connected to the output side of the second input matching circuit and matched by the first input matching circuit. An amplifier circuit for amplifying a signal to output a first high-frequency output signal, or amplifying a second high-frequency input signal matched by the second input matching circuit to output a second high-frequency output signal A first output matching circuit connected to the output side of the amplifier circuit for matching the first high-frequency output signal, and a first output matching circuit connected in series to the output side of the first output matching circuit; Of the second high-frequency output signal A high-frequency amplifier comprising an output matching circuit. 2. The first input matching circuit and the second input matching circuit are both low-pass filter type matching circuits, and the first output matching circuit and the second output matching circuit are both provided. The high-frequency amplifier according to claim 1, which is a low-pass filter type matching circuit. 3. The first input matching circuit and the second input matching circuit are both high-pass filter type matching circuits, and the first output matching circuit and the second output matching circuit are both provided. The high-frequency amplifier according to claim 1, which is a high-pass filter type matching circuit. 4. The high-pass filter type wherein the first input matching circuit matches a first high-frequency input signal and passes a second high-frequency input signal having a frequency higher than that of the first high-frequency input signal. 2. The matching circuit according to claim 1, wherein the second input matching circuit is a low-pass filter type matching circuit that matches the second high-frequency input signal and passes the first high-frequency input signal. The high-frequency amplifier according to any one of the preceding claims. 5. The low-pass filter type wherein the first input matching circuit matches a first high-frequency input signal and passes a second high-frequency input signal having a lower frequency than the first high-frequency input signal. 2. The matching circuit according to claim 1, wherein the second input matching circuit is a high-pass filter type matching circuit that matches the second high-frequency input signal and passes the first high-frequency input signal. The high-frequency amplifier according to any one of the preceding claims. 6. The high-pass filter type wherein the first output matching circuit matches a first high-frequency output signal and passes a second high-frequency output signal having a frequency higher than that of the first high-frequency output signal. 2. The matching circuit according to claim 1, wherein the second output matching circuit is a low-pass filter type matching circuit that matches the second high-frequency output signal and passes the first high-frequency output signal. 5. The high-frequency amplifier according to 4. 7. The low-pass filter type wherein the first output matching circuit matches a first high-frequency output signal and passes a second high-frequency output signal having a lower frequency than the first high-frequency output signal. 2. The matching circuit according to claim 1, wherein the second output matching circuit is a high-pass filter type matching circuit that matches the second high-frequency output signal and passes the first high-frequency output signal. 6. The high-frequency amplifier according to 5.