JPH1065409A - Magnetostatic wave device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the magnetostatic wave device having a magnetostatic wave filter used for a limiter by which a signal to control a gain of an automatic gain control amplifier deciding the level of the signal received by the magnetostatic wave filter is obtained without using a distributer and without an output loss. SOLUTION: A magnetostatic wave filter 2 used for the magnetostatic wave device 10 is provided with a end signal output terminal 2h in addition to a signal input terminal 2f and a 1st signal output terminal 2g and a signal from the 2nd signal output terminal 2h is used for gain control of an automatic gain control amplifier 1. No distributer is required by using a signal from the 2nd signal output terminal 2h and an output signal loss is eliminated. Furthermore, miniaturization and reduction in cost are attained simultaneously.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetostatic wave device, and more particularly to a magnetostatic wave device using a magnetostatic wave filter as a limiter.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a magnetostatic wave device using a magnetostatic wave filter as a conventional limiter. 4, a magnetostatic wave device 100 includes an automatic gain control amplifier (AG).
C) 101, a magnetostatic wave filter (MSW) 102, a distributor (H) 103, and a detector (DET) 104.
Further, it has an input terminal 105 and an output terminal 106. The input terminal 105 is connected to the signal input terminal 102e of the magnetostatic wave filter 102 via the automatic gain control amplifier 101, and the signal output terminal 102f of the magnetostatic wave filter 102 is connected to the distributor 1
03 is connected to the output terminal 106. Also,
The output of the divider 103 is connected to the control terminal 101a of the automatic gain control amplifier 101 via the detector 104.

FIG. 5 shows a configuration of a magnetostatic wave filter 102. In FIG. 5, the magnetostatic wave filter 102 has a GGG
(Gadolinium / Gallium / Garnet) Substrate 102
a, a signal input terminal 102e, a signal output terminal 102f, and a ground electrode 102g.
2i. YIG on the GGG substrate 102a
(Yttrium Iron Garnet) Thin Film 102b
Is formed, and an input transducer 102c and an output transducer 102d are formed on the YIG thin film 102b. The input transducer 102c is connected to the signal input terminal 102e and the ground electrode 102g, and the output transducer 102d is connected to the signal output terminal 102f and the ground electrode 102g via a wire 102h.

The magnetostatic wave filter 102 is used by applying a magnetic field to the YIG thin film 102b, and the magnetostatic wave to be excited depends on the direction of the magnetic field applied to the YIG thin film 102b, the surface magnetostatic wave (MSSW), and the volume. Forward magnetostatic wave (MS
There are three types of propagation modes: FVW) and volume backward magnetostatic wave (MSBVW). In this conventional example, the direction of the magnetic field is the direction shown by 102j, and the MSSW mode is used as the propagation mode of the magnetostatic wave.

Next, the operation of the magnetostatic wave device 100 will be described. The signal input from the input terminal 105 is amplified by the automatic gain control amplifier 101 and input to the magnetostatic wave filter 102,
A limiter is applied to the high-level signal.

The operation of the magnetostatic wave filter 102 will now be described. When a signal is input to the input transducer 102c from the signal input terminal 102e of the magnetostatic wave filter 102,
A magnetostatic wave is excited. Magnetostatic wave is output transducer 1
02d, the output transducer 102
d and output from the signal output terminal 102f.

The signal output from the magnetostatic wave filter 102 passes through the distributor 103 and is output mainly to the output terminal 106. A part of the signal that has passed through the magnetostatic wave filter 102 is input to the detector 104 via the distributor 103. The output of the detector 104 is an automatic gain control amplifier 101
Of the automatic gain control amplifier 1 according to the level of the signal input to the detector 104.
01 is controlled.

[0008]

However, in the case of the above-described magnetostatic wave device, it is necessary to provide a distributor for obtaining a signal for controlling the gain of the automatic gain control amplifier.
This leads to higher costs. Further, since the output signal is distributed, the output signal is lost.

Therefore, the present invention provides a magnetostatic wave device which does not require a distributor and has no loss in output signal.

[0010]

In order to achieve the above object, a magnetostatic wave device according to the present invention comprises at least a magnetostatic wave filter functioning as a limiter. A second signal output terminal is provided in addition to the first signal output terminal, and a level of a signal input to the magnetostatic wave filter is controlled by an output signal of the second signal output terminal.

Further, in the magnetostatic wave device of the present invention, the magnetostatic wave filter has an input transducer, a first output transducer, and a second output transducer, and the input transducer is connected to the signal input terminal and the first input transducer is connected to the first input transducer.
The output transducer of the first signal output terminal,
The second output transducer is connected to the second signal output terminal, and the first output transducer is provided between the second output transducer and the input transducer.

Further, in the magnetostatic wave device according to the present invention, the magnetostatic wave filter is characterized in that the input transducer is provided between the first output transducer and the second output transducer.

Further, in the magnetostatic wave device of the present invention, the magnetostatic wave filter is characterized in that the first output transducer and the second output transducer are provided symmetrically with respect to the input transducer. .

With such a configuration, the magnetostatic wave device of the present invention does not require a distributor, and can be reduced in size and cost.

[0015]

FIG. 1 shows an embodiment of a magnetostatic wave device according to the present invention. In FIG. 1, a magnetostatic wave device 10 includes an automatic gain control amplifier (AGC) 1 and a magnetostatic wave filter (MS).
W) 2 and a detector (DET) 3. Further, it has an input terminal 4 and an output terminal 5. The input terminal 4 is a signal input terminal 2 of the magnetostatic wave filter 2 via the automatic gain control amplifier 1.
f, and the first signal output terminal 2 g of the magnetostatic wave filter 2 is connected to the output terminal 5. The second signal output terminal 2 h of the magnetostatic wave filter 2 is connected to the control terminal 1 a of the automatic gain control amplifier 1 via the detector 3.

FIG. 2 shows the configuration of the magnetostatic wave filter 2. 2, the magnetostatic wave filter 2 includes a GGG substrate 2a, a signal input terminal 2f, a first signal output terminal 2g, a second signal output terminal 2h, and a ground electrode 2i, and is arranged on a package substrate 2k. . Y on the GGG substrate 2a
An IG thin film 2b is formed, and an input transducer 2c and a first output transducer 2 are formed on the YIG thin film 2b.
d, a second output transducer 2e is formed. The input transducer 2c, the signal input terminal 2f and the ground electrode 2i, the first output transducer 2d and the first
The signal output terminal 2g and the ground electrode 2i, and the second output transducer 2e and the second signal output terminal 2h and the ground electrode 2i are connected by wires 2j, respectively.

The magnetostatic wave filter 2 comprises a YIG thin film 2
b is used by applying a magnetic field to the magnetostatic wave to be excited.
Depending on the direction of the magnetic field applied to the IG thin film 2b, there are three types of propagation modes: a surface magnetostatic wave (MSSW), a volume forward magnetostatic wave (MSFVW), and a volume receding magnetostatic wave (MSBVW). In this embodiment, the direction of the magnetic field is 2 m, and the MSSW mode is used as the magnetostatic wave propagation mode.

Next, the operation of the magnetostatic wave device 10 will be described. The signal input from the signal input terminal 4 is input to the automatic gain control amplifier 1
And is input to the signal input terminal 2f of the magnetostatic wave filter 2. In the magnetostatic wave filter 2, a limiter is applied to a signal of a high-level frequency.

The operation of the magnetostatic wave filter 2 will now be described. When a signal is input from the signal input terminal 2f of the magnetostatic wave filter 2 to the input transducer 2c, a magnetostatic wave is excited. The magnetostatic wave propagates in the direction of the first output transducer 2d, is received by the first output transducer 2d, and is output from the first signal output terminal 2g. Also,
Some of the magnetostatic waves may leak out and be received by the second output transducer 2e without being received entirely by the first output transducer 2d. The signal received by the second output transducer 2e is output from a second signal output terminal 2h. The signal received by the second output transducer 2e is a signal that would be lost without the second output transducer,
The presence of e has no effect on the strength of the signal received at the first output transducer 2d.

First signal output terminal 2 of magnetostatic wave filter 2
The signal output from g is output to the output terminal 5. The signal output from the second signal output terminal 2h of the magnetostatic wave filter 2 is input to the detector 3. The output of the detector 3 is connected to the automatic gain control amplifier 1, and the output of the automatic gain control amplifier 1 depends on the level of the signal input to the detector 3.
The gain is controlled.

FIG. 3 shows another embodiment of the magnetostatic wave filter portion of the magnetostatic wave device of the present invention. In the embodiment of FIG.
The same parts as those in the embodiment of FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 3, the magnetostatic wave filter 6 has a YI
The first output transducer 6d and the second output transducer 6
Output transducer 6e is input transducer 6
It is formed on both sides with c in between. Input transducer 6c, signal input terminal 6f and ground electrode 2
i, the first output transducer 6d is connected to the first signal output terminal 6g and the ground electrode 2i, and the second output transducer 6e is connected to the second signal output terminal 6h and the ground electrode 2i via a wire 2j.

The magnetostatic wave filter 6 is composed of the YIG thin film 2.
b is used by applying a magnetic field to the magnetostatic wave to be excited.
Depending on the direction of the magnetic field applied to the IG thin film 2b, a volume-forward magnetostatic wave (MSFVW) and a volume-backward magnetostatic wave (MSBV)
W) There are two types of propagation modes. In the present embodiment, the direction of the magnetic field is 6 m, and the MSBVW mode is used as the magnetostatic wave propagation mode.

The operation of the magnetostatic wave filter 6 will now be described.
When a signal is input from the signal input terminal 6f of the magnetostatic wave filter 6 to the input transducer 6c, a magnetostatic wave is excited. The magnetostatic wave propagates in both directions of the first output transducer 6d and the second output transducer 6e. The signal received by the first output transducer 6d is output from the first signal output terminal 6g. Also, the second
The signal received by the output transducer 6e is output from the second signal output terminal 6h. The signal received by the second output transducer 6e is a signal that would be lost without the second output transducer, and the presence of the second output transducer would indicate the strength of the signal received by the first output transducer 6d. Has no effect. The operation of the magnetostatic wave device using the magnetostatic wave filter 6 is the same as that of FIG. 1, and the description is omitted.

In this embodiment, if the first output transducer 6d and the second output transducer 6e are formed symmetrically with respect to the input transducer 6c,
There is no difference between the delay times of the signals output to the two signal output terminals 6g and 6h. As a result, as a magnetostatic wave device,
The gain of the automatic gain control amplifier can be more accurately controlled.

[0026]

According to the magnetostatic wave device of the present invention, a signal for controlling the gain of the automatic gain control amplifier can be obtained without increasing the loss of the output signal because no distributor is used. Also, since a distributor is not required, miniaturization,
Cost can be reduced.

Further, by forming the two output transducers of the magnetostatic wave filter to be used symmetrically with respect to the input transducer, the delay time at the two outputs can be made the same, and the gain of the automatic gain control amplifier can be more accurately adjusted. Control becomes possible.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a magnetostatic wave device of the present invention.

FIG. 2 is a perspective view of one embodiment of a magnetostatic wave filter in the embodiment of FIG. 1;

FIG. 3 is a perspective view of another embodiment of the magnetostatic wave filter used in the present invention.

FIG. 4 is a block diagram showing a configuration of a magnetostatic wave device of a conventional example.

5 is a perspective view of a magnetostatic wave filter in the conventional example of FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 automatic gain control amplifier 1 a control terminal 2 magnetostatic wave filter 2 e signal input terminal 2 f signal output terminal 3 detector 4 input terminal 5 output terminal 10 magnetostatic wave device

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshihito Umegaki 2-26-10 Tenjin, Nagaokakyo-shi, Kyoto Inside Murata Manufacturing Co., Ltd.

Claims (4)

[Claims] 1. A magnetostatic wave device having at least a magnetostatic wave filter functioning as a limiter, wherein the magnetostatic wave filter has a second signal output terminal in addition to a signal input terminal and a first signal output terminal, and 2. A magnetostatic wave device, wherein the level of a signal input to the magnetostatic wave filter is controlled by an output signal from a signal output terminal of the magnetostatic wave filter. 2. The magnetostatic wave filter has an input transducer, a first output transducer, and a second output transducer, wherein the input transducer is connected to the signal input terminal, and the first output transducer is connected to the first output transducer. A signal output terminal, wherein the second output transducer is connected to the second signal output terminal, respectively, and wherein the first output transducer is provided between the second output transducer and the input transducer. The magnetostatic wave device according to claim 1, characterized in that: 3. The magnetostatic wave device according to claim 1, wherein the magnetostatic wave filter includes the input transducer provided between the first output transducer and the second output transducer. 4. The magnetostatic wave filter according to claim 3, wherein the first output transducer and the second output transducer are provided symmetrically with respect to the input transducer. Magnetic wave device.