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Surface acoustic wave device

A surface acoustic wave device and surface acoustic wave technology, applied in the direction of electrical components, impedance networks, etc., can solve the problem of increasing the number of circuits

Inactive Publication Date: 2004-10-20
TAIYO YUDEN KK
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, this in turn leads to an increase in the number of circuit parts used in radio equipment

Method used

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  • Surface acoustic wave device
  • Surface acoustic wave device
  • Surface acoustic wave device

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Embodiment Construction

[0044] Hereinafter, various embodiments of the present invention will be described with reference to the accompanying drawings. Incidentally, the following descriptions of the various embodiments are for understanding the present invention, and the protection scope of the present invention is not limited to the various embodiments, the drawings and the descriptions thereof.

[0045] figure 2 is a view showing a suitable example of a surface acoustic wave device 10 as a surface acoustic wave filter according to the present invention, which leads to similar figure 1 The mixing circuit IC3.

[0046] The surface acoustic wave filter according to the present invention has an unbalanced-balanced conversion function and an impedance conversion function. Thus, it is possible to set the balanced input of the mixer circuit IC3 to the input impedance. Therefore, it is possible not to use separate circuits for unbalanced-balanced transformation function and impedance transformation fu...

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Abstract

A surface acoustic wave filter having an unbalance-balance converting function and an impedance converting function and realizing a small surface acoustic wave device. An input interdigital transducer and an output interdigital transducer are arranged on a surface acoustic wave propagation path of a piezoelectric substrate and, assuming the intersection width of electrode fingers of the input or output interdigital transducer is X, the input or output transducer comprises two split interdigital transducers provided with electrode fingers having intersection width of about X / 2. Two split interdigital transducers are connected in series with the electrodes of each electrode finger being led out therefrom and arranged such that the signals at two outputs or inputs connected with a pair of balance terminals have a phase difference of 180 DEG.

Description

technical field [0001] The present invention relates to a surface acoustic wave device, and more particularly to a surface acoustic wave device in which any one of an input and an output has a balanced or differential terminal pair. Background technique [0002] A surface acoustic wave device is widely used as a filter in high-frequency circuits of radio equipment typified by cellular phones and the like. In recent years, integrated circuit components (ICs) having balanced or differential inputs and outputs have been used in high frequency circuits of such radio equipment. [0003] In contrast, the input / output (I / O) terminals of filters using conventional surface acoustic wave devices (hereinafter appropriately referred to as surface acoustic wave filters) are not balanced. To solve this problem, in figure 1 In the example shown, when the traditional surface acoustic wave device is connected to the frequency mixing circuit IC3, a balun called a balun must be connected bet...

Claims

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Application Information

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IPC IPC(8): H03H9/00H03H9/145H03H9/64
CPCH03H9/0061H03H9/14591H03H9/1455H03H9/0042H03H9/0028H03H9/64
Inventor 远藤刚川内治上田政则田岛基行
Owner TAIYO YUDEN KK
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