JPH05206763A - Microwave amplifier - Google Patents

Abstract

PURPOSE:To extract all output power of two transistors(TRs) even when gains of the two TRs differ by solving a problem that an unbalance component is a loss when the gains of the two TRs differ. CONSTITUTION:A phase difference between connection lines of one of 1st and 2nd 3dB 4-terminal directional couplers is varied by changing a length of a transmission line through the connection of a line to a wire bonding 11 via microstrip conductors 10 of plural islands so that an output power of an output terminal 13 is maximized in response to an output power of a transistor(TR) chip 6 and an output power of a TR chip 7. Thus, outputs of the 1st and 2nd TR chips are all extracted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave amplifier used as a signal amplifier in a microwave communication device.

[0002]

2. Description of the Related Art In recent years, solid-state amplifiers have come to be used in microwave communication because the output power of transistors has become large. The outputs of the two transistors are combined and used to increase the power.

A conventional microwave amplifier will be described below. FIG. 4 is a top view of a MIC (microwave IC) circuit of a conventional microwave amplification device in which two transistor chips are put in one package case and power is combined. In FIG. 4, 15 and 16 are MIC boards each having a back side ground conductor on the input side and an output side, 17 is an input terminal, and 18 and 22 are 3 dB in which the phases of the output signals differ by 90 °.
Directional couplers, 20, 21 are transistor chips, 1
9 and 23 are terminating resistors, and 24 is an output terminal.

The operation of the conventional microwave amplifying device having the above structure will be described below with reference to FIG. FIG. 5 is a block diagram of the conventional microwave amplifier device of FIG. 4 and an operation explanatory diagram of the combining unit. First, input terminal 1
If a signal of amplitude E1 is added to 7, the signal amplitude of each part of the circuit is expressed as a vector as shown in FIG. In the figure α
1 and α2 are amplitude gains of the first transistor chip 20 and the second transistor chip 21, respectively. When α1 = α2, all the output powers of the first transistor chip 20 and the second transistor chip 21 are combined and output to the output terminal 24.

[0005]

However, in the above-mentioned conventional configuration, when α1 ≠ α2, the unbalanced component appears in the terminating resistor 23 as the amplitude value (α1-α2) E1 / 2, that is, two transistors. When the gains of the two differ, the unbalanced component becomes a loss, and therefore it is necessary to use a uniform transistor at the time of manufacturing, which lowers the yield.

The present invention solves the above-mentioned conventional problems. Even when the gains of the two transistors are different, all the output power of the two transistors can be taken out, and the gains of the transistors are varied during manufacturing. It is an object of the present invention to provide a microwave amplification device without loss of unbalanced components.

[0007]

In order to achieve this object, a microwave amplifying device of the present invention comprises a distributor for dividing an input signal into two parts, and two transistors for receiving the output from the distributor and amplifying the signal. A first four-terminal directional coupler for inputting outputs of the two transistors, a second four-terminal directional coupler connected to an output terminal of the first directional coupler, and the second And a matching termination terminating one terminal of the four-terminal directional coupler, one of the output terminals of the first four-terminal directional coupler being one input of the second four-terminal directional coupler. Two microstrip lines that are connected to a terminal by a microtrip line, and the other output terminal of the first four-terminal directional coupler and the other input terminal of the second four-terminal directional coupler have their tips close to each other. Connected to the two adjacent A plurality of island-shaped microstrip conductors are formed in the vicinity of the tip of the cross trip line, and the plurality of island-shaped microstrip conductors are formed so that the other output power of the second four-terminal directional coupler is maximized. The two microstrip lines adjacent to each other are electrically connected via a strip conductor.

[0008]

With this configuration, the microwave amplifying device of the present invention can take out all the output power of the two transistors even when the gains of the two transistors are different due to variations in manufacturing.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a top view of a MIC circuit of a microwave amplifying device of one embodiment of the present invention in which two transistor chips are put in one package case and power is combined.
In FIG. 1, reference numerals 1 and 2 denote MIC boards each having a back-side ground conductor on an input side and an output side, 3 is an input terminal, 4 is a signal 2 divider, 5 is a Wilkinson type 2 divider resistor,
6 and 7 are the first and second transistor chips,
8 and 9 first and second 3 dB four-terminal directional couplers in which the phases of the output signals are different by 90 °, 10 is a plurality of island-shaped microstrip conductors, 11 is a wire bonding connection portion, 12 is a terminating resistor, 13 Is an output terminal.

The operation of the microwave amplifying device configured as described above will be described with reference to FIGS. 2 and 3. FIG. 2 shows the block configuration of FIG. In FIG. 2, the wire bonding connection 11 is represented by a phase shifter 14. FIG. 3 is a block configuration and operation explanatory diagram of a portion after the first 3 dB four-terminal directional coupler in FIG.

First, the output amplitudes E1 of the first and second transistor chips are respectively applied to the input terminals T1 and T2.
When the signal of E2 is added, the signal amplitude of each part of the circuit is expressed as a vector as shown in FIG. Here, terminal T3
When the phase of the signal vector A1 transmitted from the terminal T6 to the terminal T6 matches the phase of the signal vector A2 transmitted from the terminal T4 to the terminal T6, the signal appearing at the terminal T5 becomes 0, and the input terminal T1
The input powers of T2 and T2 are all available at the output terminal T4. That is, if the phase amount of the phase shifter 14 is φ, the phases φ1 and φ2 of the vectors A1 and A2 are (Equation 1) and (Equation 2).

[0013]

[Equation 1]

[0014]

[Equation 2]

From these, φ = 2 tan ⁻¹ (E2 / E1)
Then, the above condition is obtained. Therefore, in the configuration of FIG. 1, the phase difference between the connection lines of one of the first and second 3 dB four-terminal directional couplers can be set to this value, and the phase can be changed by the line length. By connecting the lines with the wire bonding 11 through the plurality of island-shaped microstrip conductors 10 so as to maximize the output power of the terminal 13, it is possible to take out all the outputs of the first and second transistor chips. .. Then, by using the plurality of island-shaped microstrip conductors 10, the connection pattern that maximizes the output power can be easily determined.

As described above, according to this embodiment, the line length of the connecting portion of one terminal of the first and second 3 dB four-terminal directional couplers is changed to change the line lengths of the first and second transistor chips. Even if the gains are different, all of the output power of each can be taken out to the required terminal.

Although wire bonding is used to connect the island-shaped microstrip conductors in this embodiment, a plate piece such as a gold conductor may be used. Also, FIG.
As can be seen from the above, it goes without saying that the output power of the packaged amplifier composed of two transistor chips can be set to a required level and a microwave amplifier having a constant output power value can be constructed.

[0018]

As described above, according to the present invention, the output terminal of the distributor for dividing the input signal into two, two transistors for receiving the output from the distributor and amplifying the signal, and
A first four-terminal directional coupler for inputting the outputs of two transistors, a second four-terminal directional coupler connected to the output terminals of the first directional coupler, and the second four-terminal directional coupler Consists of a matching termination that terminates one terminal of the sex coupler,
One of the output terminals of the first four-terminal directional coupler is connected to one input terminal of the second four-terminal directional coupler by a microtrip line, and the one of the output terminals of the first four-terminal directional coupler is connected. The other output terminal and the other input terminal of the second four-terminal directional coupler are connected to two microstrip lines whose tips are close to each other, and a plurality of microstrip lines are provided near the tips of the two microstrip lines which are close to each other. The island-shaped microstrip conductors are formed, and the two adjacent micros via the plurality of island-shaped microstrip conductors are formed so that the output power of the other of the second four-terminal directional coupler is maximized. Even if the strip lines are electrically connected and the gains of the two transistors are different, all of the output power of the two transistors can be taken out, and the transistors can be used at the time of manufacture. Those that can achieve microwave amplification device excellent lossless unbalanced components even when varies.

[Brief description of drawings]

FIG. 1 is a diagram showing an MI of a microwave amplifier according to an embodiment of the present invention.
Top view of C circuit

FIG. 2 is a block configuration diagram of a microwave amplifier device according to an embodiment of the present invention.

FIG. 3 is an operation explanatory diagram of a combining unit of the microwave amplification device according to the embodiment of the present invention.

FIG. 4 is a top view of a MIC circuit of a conventional microwave amplification device.

FIG. 5 is a block configuration diagram and operation explanatory diagram of a conventional microwave amplification device.

[Explanation of symbols]

 3 Input Terminals 4 Distributor 6 First Transistor Chip 7 Second Transistor Chip 8 First 3dB Four-Terminal Directional Coupler 9 Second 3dB Four-Terminal Directional Coupler 10 Island Microstrip Conductor 11 Wire Bonding 12 Terminating resistor 13 Output terminal

Claims (1)

[Claims] 1. A divider that divides an input signal into two, two transistors that receive the output from the divider and amplify the signal, and a first four-terminal directional coupler that receives the outputs of the two transistors. A second four-terminal directional coupler connected to the output terminal of the first directional coupler, and a matching termination terminating one terminal of the second four-terminal directional coupler, One of the output terminals of the first four-terminal directional coupler is connected to one input terminal of the second four-terminal directional coupler by a micro trip line, and the one of the output terminals of the first four-terminal directional coupler is connected. The other output terminal and the other input terminal of the second four-terminal directional coupler are connected to two microstrip lines whose tips are close to each other, and a plurality of microstrip lines are provided near the tips of the two microstrip lines which are close to each other. Island-shaped microstrip conductor Formed, the other of the output power of the second four-terminal directional coupler so as to maximize, to the proximity via the plurality of island-shaped microstrip conductor 2
The two microstrip lines are electrically connected, and
A microwave amplifying device, wherein all the output powers of the two transistors are taken out even when the gains of the two transistors are different.