JPH10126173A - Power amplifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mount the power amplifiers of different frequency bands on a single sheet of substrate by forming plural matching circuits, consisting of strip lines of different frequency bands on the same substrate and switching the matching circuits by the frequency bands using the strip lines. SOLUTION: Matching circuits 27, 28, 31, 34, 35 and 37 consisting of strip lines of 1st frequency bands are formed on a 1st side of the same printed wiring board. At the same time, the matching circuits consisting of strip lines of the frequency bands which are different from those of circuits 27 to 37 are formed on a 2nd side of the printed wiring board. In a VHF band operation mode, the switching terminals 5, 13, 18 and 26 are connected to the terminals 6, 12, 19 and 24 respectively. In a UHF band operation mode, the switching terminals 5, 13, 18 and 26 are connected to terminals 7, 11, 20 and 25 respectively. In such a constitution, the input/output strip lines of every amplifier stages can be switched by means of both sides of the printed wiring board.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a power amplifier.

[0002]

2. Description of the Related Art An example of a conventional power amplifier is shown in FIG.
This will be described with reference to FIGS. 3 and 4 show printed circuit boards dedicated to the VHF band, and FIGS. 5 and 6 show printed circuit boards dedicated to the UHF band.
On the first surface 39 of the VHF band dedicated substrate shown in FIG. 3, the first-stage transistor 15 is provided in the first-stage transistor mounting hole 2 of the printed circuit board, and the second-stage transistor
When the first-stage transistor 16 is mounted, the output of the first-stage transistor 15 is connected to the first-stage first-stage transistor output matching circuit strip line 4 and passes through the first-stage transistor output matching circuit strip line conduction hole 43. ,
The second surface VHF band 1 and the strip line 31 for the matching circuit between the two-stage transistors are connected to the VHF band 1 and the strip line 31 for the matching circuit between the two-stage transistors via the capacitor 29 for the matching circuit between the two-stage transistors. Line conduction hole 43
Then, the signal is input to the second-stage transistor 16 through the first-stage second-stage transistor input matching circuit strip line 14. The output of the second-stage transistor 16 is connected to the second-stage second-stage transistor output matching circuit strip line 35 through the conduction hole 45 from the second-stage transistor output matching circuit strip line 17 on the first surface, 2nd surface VHF band 2
It passes through the capacitor 36 for output-stage matching between transistors,
The second terminal VHF band second stage transistor output matching circuit strip line 37 passes through the second surface VHF band second stage transistor output matching circuit capacitor 38, and the output terminal 2
6 is connected.

Next, when the first-stage transistor 15 and the second-stage transistor 16 attached above are attached to the first surface 41 of the UHF band dedicated substrate, the first-stage transistor 1
The output 5 is connected to the first-stage first-stage transistor output matching circuit strip line 4 on the first surface, passes through the first-stage 1 and second-stage transistor matching capacitor 9, and then enters the first-surface second-stage transistor input matching. Through the circuit strip line 14, 2
It is input to the stage transistor 16. The output of the second-stage transistor 16 is supplied from the first-surface second-stage transistor output matching circuit strip line 17 to the first-surface second-stage transistor output matching capacitor 21 via the first-surface second-stage transistor output matching capacitor 21. From the first-stage second-stage transistor output matching capacitor 23 to the output terminal 26 through the first strip line 22.

[0004]

In the prior art, when configuring power amplifiers of two or more different frequency bands, each power amplifier is manufactured for each frequency band to be used.
Two or more units had to be combined and the output of that unit switched. An object of the present invention is to solve these drawbacks and to mount power amplifiers of different frequency bands on one board.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a matching circuit for a plurality of frequency bands using strip lines having different frequency bands on the same substrate, and a frequency using each strip line. It is configured to switch by band. As a result, a device that configures power amplifiers having different frequency bands on a single substrate can be realized.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In this embodiment, a printed circuit board including a first surface and a second surface will be described. As shown in FIG.
On the first side 1 of the printed circuit board, in the case of the VHF band operation in which the first-stage transistor 15 is mounted in the first-stage mounting hole 2 of the printed circuit board and the second-stage transistor 16 is mounted in the second-stage transistor mounting hole 3, the first stage The output of the transistor 15 is connected to the first-stage first-surface transistor output matching circuit strip line 4, and the first-surface first-stage transistor output matching circuit strip line switching terminal 5 is connected between the VHF band first and second-stage transistors. It is switched to the matching circuit strip line switching circuit terminal 6, and the second surface VHF band 1,
It is connected to the strip line 28 for the matching circuit between the two-stage transistors, and passes through the second surface VHF band 1 and the capacitor 29 for the matching circuit between the two-stage transistors to the second surface VHF band 1 and the strip line 31 for the matching circuit between the two-stage transistors. Connected
On the way, the second surface is matched by VHF band 1 and capacitors 30, 32, 33 for the matching circuit between the two-stage transistors.
It is connected to the strip line switching circuit terminal 12 for the two-stage transistor-to-transistor matching circuit, and the first-stage second-stage transistor input matching-circuit strip-line switching terminal 13 is switched to the terminal 12 to provide the first-stage second-stage transistor input. The signal is input to the second-stage transistor 16 by the matching circuit strip line 34. The output of the second-stage transistor 16 is output from the first-stage second-stage transistor output matching circuit strip line 17 to the second-stage transistor output matching circuit strip line switching circuit terminal 18 in the VHF band second-stage transistor output matching circuit. To the second line VHF band second stage transistor output matching circuit capacitor 36, and to the second surface VHF band second stage transistor output matching circuit capacitor 36.
Switching of the VHF band output matching circuit strip line switched by the output terminal 26 through the surface VHF band second stage transistor output matching circuit strip line 37 and the second surface VHF band second stage transistor output matching circuit capacitor 38 It is connected to the circuit terminal 24.

Next, in the case of UHF band operation, the output of the first-stage transistor 15 is connected to the strip line 4 for the first-stage first-stage transistor output matching circuit, and is connected to the first-stage first-stage transistor output matching circuit. The strip line switching terminal 5 is switched to the UHF band 1 and the strip line switching circuit terminal 7 for the second-stage inter-transistor matching circuit, and is connected to the first surface UHF band 1 and the strip line 8 for the second-stage inter-transistor matching circuit. The UHF band 1 is connected to the strip line 10 for the matching circuit between the two-stage transistors via the first surface 1 and the capacitor 9 for matching between the two-stage transistors, and is connected to the strip line switching circuit terminal for the matching circuit between the UHF band 1 and the two-stage transistor. 11, a strip line switching terminal 13 for the first-stage second-stage transistor input matching circuit
Then, the signal is input to the second-stage transistor 16 through the first-stage second-stage transistor input matching circuit strip line 14. The output of the second-stage transistor 16 is output from the first-stage second-stage transistor output matching circuit strip line 17 to the second line.
The first-stage transistor output matching circuit strip line switching circuit terminal 18 is switched to the UHF band second-stage transistor output and output matching circuit strip line switching terminal 20, and the first surface UHF band second-stage transistor output matching circuit capacitor 21 is switched. Connected to the first surface UHF band second stage transistor output matching circuit strip line 22 and the first surface UHF band second stage transistor output matching circuit capacitor 23 for the UHF band output matching circuit strip line switching circuit. The output terminal 26 is switched and connected to the terminal 25.

[0008]

As described above, according to the present invention, power amplifiers having different frequencies can be realized using a single printed circuit board without individually manufacturing power amplifiers having different use frequency bands. The effect is significant. Further, since the means of the present invention is extremely simple, it is excellent in economic efficiency and its application range is wide.

[Brief description of the drawings]

FIG. 1 is a pattern diagram and a component mounting diagram of a first surface showing an embodiment of the present invention.

FIG. 2 is a pattern diagram and a component mounting diagram of a second surface showing one embodiment of the present invention.

FIG. 3 is a pattern diagram and a component mounting diagram on a first surface showing an example of a conventional power amplifier.

FIG. 4 is a pattern diagram and a component mounting diagram of a second surface showing an example of a conventional power amplifier.

FIG. 5 is a pattern diagram and a component mounting diagram on a first surface showing an example of a conventional power amplifier.

FIG. 6 is a pattern diagram and a component mounting diagram of a second surface showing an example of a conventional power amplifier.

DESCRIPTION OF REFERENCE NUMERALS 1: 1st surface of printed circuit board, 2: first-stage transistor mounting hole, 3: second-stage transistor mounting hole, 4: first surface, first-stage transistor output matching circuit strip line, 5 ... Stripline switching circuit terminals for first-stage first-stage transistor output matching circuit, 6... VHF band 1, 2
Stripline switching circuit terminal for matching circuit between two-stage transistors, 7: UHF band 1, stripline switching circuit terminal for matching circuit between two-stage transistors, 8: First surface 1, stripline for first surface matching circuit between two-stage transistors , 9... First surface 1, capacitor for matching between two-stage transistors, 10.
Surface 1, strip line for first surface matching circuit between two-stage transistors, 11 ... UHF band 1, strip line switching circuit terminal for two-stage transistor matching circuit, 12 ... Strip line for VHF band 1, two-stage transistor matching circuit Switching circuit terminal, 13: Strip line for first-stage second-stage transistor input matching circuit switching circuit terminal, 14: Strip line for first-surface, second-stage transistor input matching circuit, 15: First-stage transistor, 16: Second stage Eye transistor, 17
... Strip line for first-stage second-stage transistor output matching circuit, 18 ... Strip-line switching circuit terminal for first-stage second-stage transistor output matching circuit, 19 ... Strip line switching circuit for VHF band second-stage transistor output matching circuit Terminal 20: UHF band second stage, strip line switching circuit terminal for output-to-output matching circuit, 21: first-stage second-stage transistor output matching capacitor, 22: first-surface, second-stage transistor output matching circuit strip line, 23 ... Capacitors for first-stage second-stage transistor output matching circuits, 24... Stripline switching circuit terminals for VHF band output matching circuits, 25.
Strip line switching circuit terminals for band output matching circuit, 26 ...
Output terminals, 27: strip line for output matching circuit of second-stage first-stage transistor, 28: strip line for matching circuit between second-stage VHF band 1, two-stage transistor, 29, 30,
32, 33: second surface VHF band 1, capacitor for matching circuit between two-stage transistors, 31: second surface VHF band 1, strip line for matching circuit between two-stage transistors, 34: input matching on second surface of first surface transistor Circuit strip line, 3
5: strip line for second-stage second-stage transistor output matching circuit; 36, 38: second-surface VHF band capacitor for second-stage transistor output matching circuit; 37: second-surface VHF band 2
39th stage transistor output matching circuit strip line
... VHF band dedicated substrate first surface, 40 ... VHF band dedicated substrate second surface, 41 ... UHF band dedicated substrate first surface,
42... UHF band dedicated substrate second surface, 43... Strip line conducting hole for first stage transistor output matching circuit, 44.
Strip line conduction hole for the second-stage transistor input matching circuit, 45... Strip line conduction hole for the second-stage transistor output matching circuit, 46.

Claims (1)

[Claims] 1. A multi-frequency band matching circuit comprising a plurality of strip lines formed on the same printed circuit board and applied to different frequency bands. A power amplifier characterized by being configured to switch.