JP3380417B2 - Polarized surface acoustic wave filter - Google Patents
Polarized surface acoustic wave filterInfo
- Publication number
- JP3380417B2 JP3380417B2 JP02760297A JP2760297A JP3380417B2 JP 3380417 B2 JP3380417 B2 JP 3380417B2 JP 02760297 A JP02760297 A JP 02760297A JP 2760297 A JP2760297 A JP 2760297A JP 3380417 B2 JP3380417 B2 JP 3380417B2
- Authority
- JP
- Japan
- Prior art keywords
- acoustic wave
- surface acoustic
- wave filter
- arm saw
- filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000010897 surface acoustic wave method Methods 0.000 title claims description 19
- 239000000758 substrate Substances 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 25
- 238000003780 insertion Methods 0.000 description 5
- 230000037431 insertion Effects 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 4
- 238000010295 mobile communication Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
- H03H9/6423—Means for obtaining a particular transfer characteristic
- H03H9/6433—Coupled resonator filters
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
- H03H9/02—Details
- H03H9/125—Driving means, e.g. electrodes, coils
- H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
- H03H9/14597—Matching SAW transducers to external electrical circuits
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、共振器形ＳＡＷ
（表面弾性波）フィルタと付加インピーダンスにより構
成された有極型ＳＡＷフィルタに関するものである。TECHNICAL FIELD The present invention relates to a resonator type SAW.
The present invention relates to a polar SAW filter including a (surface acoustic wave) filter and an additional impedance.
【０００２】[0002]
【従来の技術】ＳＡＷフィルタはＬＳＩと同様に、量産
製に優れていることから、民生機器や通信機器で広範囲
に用いられている。特に、小型、かつ軽量であるという
特徴から、ポケットベル、携帯電話等の移動体通信にお
いて、高周波フィルタとして多用されている。2. Description of the Related Art SAW filters are widely used in consumer devices and communication devices because they are excellent in mass production as in LSI. In particular, because of its small size and light weight, it is widely used as a high-frequency filter in mobile communication such as pagers and mobile phones.
【０００３】ところで、移動体通信に用いられるＳＡＷ
フィルタは、低挿入損失で急峻な周波数特性が要求され
る。このようなＳＡＷフィルタは、図５に示すように、
直列素子１０，１１，１２、並列素子２０，２１にＳＡ
Ｗ共振子を用いた帯域通過型フィルタ構成となってい
る。なお、図５において、１，２は端子、Ｅは接地端子
である。By the way, SAW used for mobile communication
The filter is required to have low insertion loss and steep frequency characteristics. Such a SAW filter has a structure as shown in FIG.
SA in series elements 10, 11, 12 and parallel elements 20, 21
It has a bandpass filter configuration using a W resonator. In FIG. 5, 1 and 2 are terminals, and E is a ground terminal.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、最近の
携帯電話等の移動体通信機器の高性能化に伴い、ＳＡＷ
フィルタの一層の低挿入損失化が要求されている。この
要求に対して、上記した図５に示される梯子型フィルタ
が主に用いられているが、この種の梯子型ＳＡＷフィル
タは、用いる圧電基板にその特性を依存しているのが現
状である。However, as mobile communication devices such as mobile phones have become more sophisticated in recent years, SAW has been improved.
It is required to further reduce the insertion loss of the filter. In response to this demand, the ladder type filter shown in FIG. 5 described above is mainly used, but the present condition is that this type of ladder type SAW filter depends on the characteristics of the piezoelectric substrate used. .
【０００５】具体的には通過帯域の帯域幅、挿入損失、
通過帯域と減衰帯域の特性の急峻さ及び減衰帯域の減衰
量に圧電基板の特性が関係している。Specifically, the passband bandwidth, insertion loss,
The characteristics of the piezoelectric substrate are related to the steepness of the characteristics of the pass band and the attenuation band and the amount of attenuation in the attenuation band.
【０００６】また、梯子型ＳＡＷフィルタにおいて、用
いるＳＡＷ共振器の共振周波数（直列共振周波数）、反
共振周波数（並列共振周波数）、通過帯域、減衰帯域ま
たはその逆を利用するものでは、通過帯域と減衰帯域の
配置もしくは間隔が制限される問題がある。Further, in the ladder type SAW filter, when the resonance frequency (series resonance frequency), anti-resonance frequency (parallel resonance frequency), pass band, attenuation band or vice versa of the SAW resonator to be used is used, There is a problem that the arrangement or spacing of the attenuation bands is limited.
【０００７】したがって、通過帯域と減衰帯域の間隔が
狭く、しかも通過帯域において低損失を得ることは難し
いといった問題があった。Therefore, there is a problem that the distance between the pass band and the attenuation band is narrow and it is difficult to obtain a low loss in the pass band.
【０００８】本発明は、このような状況に鑑みてなされ
たもので、その目的は梯子型ＳＡＷフィルタの周波数特
性を改善することにある。The present invention has been made in view of such a situation, and an object thereof is to improve frequency characteristics of a ladder type SAW filter.
【０００９】[0009]
【課題を解決するための手段】本発明は、上記目的を達
成するために、
〔１〕有極型弾性表面波フィルタにおいて、入力端子と
出力端子との間に接続された第１の直列腕ＳＡＷ共振器
と、前記第１の直列腕ＳＡＷ共振器の両端に対して、一
方の電極がそれぞれ圧電基板上で接続された第１及び第
２の並列腕ＳＡＷ共振器と、前記第１及び第２の並列腕
ＳＡＷ共振器のそれぞれの他方の電極が前記圧電基板上
で接続された共通接地部とを有しており、前記共通接地
部は、ボンディングワイヤを介して接地電位に接続され
ており、かつ、前記有極型弾性表面波フィルタの二等分
回路に関する短絡インピーダンスは、前記二等分回路に
関する開放インピーダンスと実質的に等しくするように
したものである。In order to achieve the above-mentioned object, the present invention provides [1] a polar type surface acoustic wave filter having an input terminal and
First series arm SAW resonator connected between the output terminal and the output terminal
And both ends of the first series arm SAW resonator are
One of the electrodes is connected on the piezoelectric substrate,
Two parallel arm SAW resonators and the first and second parallel arms
The other electrode of each SAW resonator is on the piezoelectric substrate.
And a common ground part connected by
The part is connected to the ground potential via the bonding wire
And the halving of the polar surface acoustic wave filter
The short circuit impedance for the circuit is
It is designed to be substantially equal to the related open impedance .
【００１０】〔２〕上記〔１〕記載の有極型弾性表面波
フィルタにおいて、前記入力端子と前記第１の直列腕Ｓ
ＡＷ共振器との間に接続された第２の直列腕ＳＡＷ共振
器を有するようにしたものである。[2] Polarized surface acoustic wave according to the above [1]
In the filter, the input terminal and the first series arm S
Second series arm SAW resonance connected between AW resonator
It has a container .
【００１１】〔３〕上記〔２〕記載の有極型弾性表面波
フィルタにおいて、前記出力端子と前記第１の直列腕Ｓ
ＡＷ共振器との間に接続された第３の直列腕ＳＡＷ共振
器を有するようにしたものである。[0011] [3] In polar SAW <br/> filter according to [2] Symbol mounting, the said output terminal first series arm S
Third series arm SAW resonance connected between AW resonator
It has a container .
【００１２】〔４〕上記〔３〕記載の有極型弾性表面波
フィルタにおいて、前記第３の直列 腕ＳＡＷ共振器と前
記出力端子との間に、一方の電極が接続された第３の並
列腕ＳＡＷ共振器を有しており、前記第３の並列腕ＳＡ
Ｗ共振器の他方の電極は接地電位に接続されるようにし
たものである。[4] In the polarized surface acoustic wave filter according to the above [ 3 ], the third series arm SAW resonator and the front
A third parallel circuit in which one electrode is connected to the output terminal.
A third arm SA having a row arm SAW resonator,
The other electrode of the W resonator is adapted to be connected to the ground potential .
【００１３】〔５〕上記〔２〕記載の有極型弾性表面波
フィルタを複数段縦続接続させるようにしたものであ
る。[0013] [5] is to be calculated and to so that the polar surface acoustic wave <br/> filter according to [2], wherein is a plurality of stages connected in cascade.
【００１４】〔６〕上記〔１〕〜〔５〕のいずれか１項
に記載された有極型弾性表面波フィルタにおいて、前記
有極型弾性表面波フィルタは送信用フィルタであるよう
にしたものである。[6] Any one of the above [ 1] to [5]
In Yukyokugata SAW filter described in said
The polarized surface acoustic wave filter is a transmission filter .
【００１５】[0015]
【発明の実施の形態】以下、本発明の実施の形態につい
て図面を参照して詳細に説明する。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
【００１６】図１は本発明の第１実施例を示す５段有極
型ＳＡＷフィルタの構成図、図２はその基本有極型ＳＡ
Ｗフィルタの構成図、図３はその基本有極型ＳＡＷフィ
ルタの集中定数等価回路図である。FIG. 1 is a block diagram of a five-stage polarized SAW filter showing a first embodiment of the present invention, and FIG. 2 is its basic polarized SA.
FIG. 3 is a configuration diagram of the W filter, and FIG. 3 is a lumped constant equivalent circuit diagram of the basic polarized SAW filter.
【００１７】図１に示すように、二つの直列腕ＳＡＷ共
振器１０，１１と二つの並列腕ＳＡＷ共振器２０，２１
を用いた共振器形ＳＡＷフィルタ２００と、二端子対回
路２０１の直列接続により構成される有極型ＳＡＷフィ
ルタ２０００において、二端子対回路２０１のインピー
ダンス３により減衰極を形成した基本有極型ＳＡＷフィ
ルタと梯子型ＳＡＷフィルタ２０２により構成される。As shown in FIG. 1, two series arm SAW resonators 10 and 11 and two parallel arm SAW resonators 20 and 21 are provided.
In a polar SAW filter 2000 configured by connecting a two-terminal pair circuit 201 in series with a resonator-type SAW filter 200 using the above, a basic polar SAW in which an attenuation pole is formed by the impedance 3 of the two-terminal pair circuit 201. It is composed of a filter and a ladder type SAW filter 202.
【００１８】このように、二つの二端子対回路２００，
２０１を直列接続した有極型ＳＡＷフィルタ２０００
（以下、基本有極型ＳＡＷフィルタ）と梯子型ＳＡＷフ
ィルタ２０２により、通過帯域と減衰帯域の間隔が狭
く、特性が急峻で、しかも通過帯域において低損失な高
性能梯子型ＳＡＷフィルタを実現するものである。Thus, the two two-terminal pair circuits 200,
Polarized SAW filter 2000 in which 201 is connected in series
(Hereinafter, a basic polar SAW filter) and a ladder SAW filter 202 realize a high-performance ladder SAW filter with a narrow gap between the pass band and the attenuation band, steep characteristics, and low loss in the pass band. Is.
【００１９】そして、具体的には、一つの二端子対回路
として共振器形ＳＡＷフィルタ２００、一つの二端子対
回路２０１としてインダクタのみで構成する。More specifically, the resonator type SAW filter 200 is used as one two-terminal pair circuit, and the inductor is used as one two-terminal pair circuit 201.
【００２０】また、インピーダンスにワイヤボンディン
グのインダクタを用いたり、インダクタとキャパシタの
並列共振回路を用いたり、インダクタとキャパシタの並
列共振回路とインダクタの直列回路を用いたり、インダ
クタとキャパシタの直列共振回路とキャパシタの並列回
路を用いるようにしてもよい。Further, a wire-bonding inductor is used for impedance, a parallel resonance circuit of an inductor and a capacitor is used, a parallel resonance circuit of an inductor and a capacitor and a series circuit of an inductor are used, and a series resonance circuit of an inductor and a capacitor is used. You may make it use the parallel circuit of a capacitor.
【００２１】まず、図２の基本有極型ＳＡＷフィルタの
動作を、図３の集中定数回路を用いて説明する。また、
図４は説明のための図３に示す回路を二等分した回路図
である。なお、図３及び図４において、１３〜１８，２
２，２３はＳＡＷ共振器の等価回路、ＺA ４はインピー
ダンスである。First, the operation of the basic polarized SAW filter of FIG. 2 will be described using the lumped constant circuit of FIG. Also,
FIG. 4 is a circuit diagram obtained by dividing the circuit shown in FIG. 3 into two equal parts for explanation. In addition, in FIGS. 3 and 4, 13 to 18, 2
Reference numerals 2 and 23 are equivalent circuits of the SAW resonator, and Z A 4 is an impedance.
【００２２】ここでＬ0 ＝０の場合、及びＬ0 ≠０の場
合について考察する。Now, consider the case of L 0 = 0 and the case of L 0 ≠ 0.
【００２３】（Ａ）Ｌ0 ＝０の場合、図４に示す回路に
おいて、端子（６，７，８）を開放した場合の端子５
と、接地端子Ｅからの入力インピーダンスＺ3O及び端子
（６，７，８）を短絡した場合の端子５と、接地端子Ｅ
からの入力インピーダンスＺ3Sを求めると、以下に示す
式（１）及び式（２）で与えられる。(A) When L 0 = 0, in the circuit shown in FIG. 4, the terminal 5 when the terminals (6, 7, 8) are opened
And the input impedance Z 3O from the ground terminal E and the terminal 5 when the terminals (6, 7, 8) are short-circuited, and the ground terminal E
When the input impedance Z 3S from is calculated , it is given by the following equations (1) and (2).
【００２４】
Ｚ3O＝Ｚ1 ＋Ｚ3 …（１）
Ｚ3S＝Ｚ1 ＋Ｚ2 ×Ｚ3 ／（Ｚ2 ＋Ｚ3 ） …（２）
ここで
Ｚ1 ＝（１＋Ｓ2 ＬS1ＣS1）／（ＳＣS10 ＋ＳＣS1＋Ｓ3 ＬS1ＣS1ＣS10 ）
Ｚ2 ＝（１＋Ｓ2 ＬS2ＣS2）／（ＳＣS20 ＋ＳＣS2＋Ｓ3 ＬS2ＣS2ＣS20 ）
Ｚ3 ＝（１＋Ｓ2 ＬS3ＣS3）／（ＳＣS30 ＋ＳＣS3＋Ｓ3 ＬS3ＣS3ＣS30 ）
Ｓ＝ｊω， ω＝２πｆ …（３）
また、図４に示す回路の周波数特性α（ω）は、上記式
（１）及び式（２）を用いて、以下に示す式（４）で与
えられる。Z 3O = Z 1 + Z 3 (1) Z 3S = Z 1 + Z 2 × Z 3 / (Z 2 + Z 3 ) (2) where Z 1 = (1 + S 2 L S1 C S1 ) / ( SC S10 + SC S1 + S 3 L S1 C S1 C S10) Z 2 = (1 + S 2 L S2 C S2) / (SC S20 + SC S2 + S 3 L S2 C S2 C S20) Z 3 = (1 + S 2 L S3 C S3) / (SC S30 + SC S3 + S 3 L S3 C S3 C S30 ) S = jω, ω = 2πf (3) Further, the frequency characteristic α (ω) of the circuit shown in FIG. It is given by the following equation (4) using 2).
【００２５】 α（ω）＝２０．０×Ｌｏｇ｛ＡＢＳ〔（１＋Ｚ30）（１＋Ｚ3S）／ （Ｚ30−Ｚ3S）〕｝（ｄＢ） …（４） ここで、ＡＢＳ〔 〕は、〔 〕内の絶対値を表す。Α (ω) = 20.0 × Log {ABS [(1 + Z 30 ) (1 + Z 3S ) / (Z 30 −Z 3S )]} (dB) (4) where ABS [] is [ ] Represents the absolute value.
【００２６】すなわち、ＬO ＝０の場合の図１に示す有
極型ＳＡＷフィルタの周波数特性は、上記式（４）より
判る。周波数特性上の減衰極は、上記式（３）より次の
場合である。That is, the frequency characteristic of the polar SAW filter shown in FIG. 1 when L O = 0 is found from the above equation (4). The attenuation pole on the frequency characteristic is the following case from the above equation (3).
【００２７】
１．Ｚ30＝∞ または、Ｚ3S＝∞，
２．Ｚ30＝Ｚ3S＝０
３．Ｚ30＝Ｚ3S …（５）
このＺ1 ，Ｚ2 ，Ｚ3 がＳＡＷ共振子の場合、上記式
（３）より上記式（５）の条件は決まる。1. Z 30 = ∞ or Z 3S = ∞, 2. Z 30 = Z 3S = 0 3. Z 30 = Z 3S (5) When Z 1 , Z 2 and Z 3 are SAW resonators, the condition of the above formula (5) is determined from the above formula (3).
【００２８】（Ｂ）Ｌ0 ≠０の場合ここで、図１におい
て、上記式（１）、式（２）において、上記式（１）の
み以下に示す式（６）で与えられる。(B) In the case of L 0 ≠ 0 Here, in FIG. 1, in the above equations (1) and (2), only the above equation (1) is given by the following equation (6).
【００２９】
Ｚ30（Ｌ0 ）＝Ｚ1 ＋Ｚ3 ＋ＳＬ0 …（６）
上記式（２）及び式（６）より、上記式（５）の条件を
満足するように、Ｌ0を決める。Z 30 (L 0 ) = Z 1 + Z 3 + SL 0 (6) From the above formulas (2) and (6), L 0 is determined so as to satisfy the condition of the above formula (5).
【００３０】図２に示す基本有極型ＳＡＷフィルタは、
Ｌ0 を付加し、広範囲に、且つ、上記式（５）〔Ｚ
30（Ｌ0 ）≒Ｚ3S〕の関係を満足するようにして、周波
数特性上において減衰極を形成し、低挿入損失で、しか
も急峻な特性を有する有極型ＳＡＷフィルタである。The basic polarized SAW filter shown in FIG.
L 0 is added to a wide range and the above formula (5) [Z
It is a polar SAW filter that satisfies the relationship of 30 (L 0 ) ≈Z 3S ], forms an attenuation pole in frequency characteristics, has a low insertion loss, and has steep characteristics.
【００３１】次に、本発明の動作について、図１と図７
を比較して、図１の優位性を示すことにより説明する。
なお、図８は比較説明するための基本回路である。Next, the operation of the present invention will be described with reference to FIGS.
Will be explained by comparing the above and showing the superiority of FIG.
Note that FIG. 8 shows a basic circuit for comparative explanation.
【００３２】この基本回路を二等分して、二等分回路の
先端開放インピーダンス（Ｚ0 ）及び先端短絡インピー
ダンス（ＺS ）は、以下に示す式（７）及び式（８）で
与えられる。This basic circuit is bisected, and the open-ended impedance (Z 0 ) and the short-circuited impedance (Z S ) of the bisected circuit are given by the following equations (7) and (8). .
【００３３】
Ｚ0 ＝ＺP ×（ＺS ＋Ｚm ）／（ＺP ＋ＺS ＋Ｚm ）＋ＺA …（７）
ＺS ＝ＺP ×ＺS ／（ＺP ＋ＺS ） …（８）
ここで、ＺP ＝１／ＹP ，Ｚm ＝１／Ｙm
すなわち、本発明の第１実施例を示す図１の場合、Ｙm
＝０で、Ｚ0 とＺS の次数の違いが少なく、Ｚ0 ≒ＺS
が広い範囲の帯域での実現が容易である。Z 0 = Z P × (Z S + Z m ) / (Z P + Z S + Z m ) + Z A (7) Z S = Z P × Z S / (Z P + Z S ) (8) Here Z P = 1 / Y P , Z m = 1 / Y m, that is, Y m in the case of FIG. 1 showing the first embodiment of the present invention.
= 0, the difference between the orders of Z 0 and Z S is small, and Z 0 ≈Z S
Is easy to realize in a wide band.
【００３４】しかし、図７の場合は、Ｚ0 とＺS の次数
の違いが大きく、Ｚ0 ≒ＺS が広い範囲の帯域での実現
が容易ではない。However, in the case of FIG. 7, the difference between the orders of Z 0 and Z S is large, and it is not easy to realize Z 0 ≈Z S in a wide band.
【００３５】ここで、まず、図２のその基本有極型ＳＡ
Ｗフィルタの実施例をＣＤＭＡ用Ｔｘ（送信用）−フィ
ルタにより説明する。Here, first, the basic polarized SA of FIG.
An example of the W filter will be described with reference to Tx for CDMA (for transmission) -filter.
【００３６】図５は従来技術の説明においても述べた
が、従来のＣＤＭＡ用Ｔｘ−フィルタの回路構成図で、
４段構成共振器型ＳＡＷフィルタ（直列腕共振器：ＲS1
１０，ＲS2１１，ＲS3１２，並列腕共振器：ＲP1２０，
ＲP2２１）である。As described in the description of the prior art, FIG. 5 is a circuit diagram of a conventional CDMA Tx-filter.
4-stage resonator SAW filter (series arm resonator: R S1
10, R S2 11, R S3 12, parallel arm resonator: R P1 20,
R P2 21).
【００３７】図５において、直列腕のＳＡＷ共振器の基
本構成は（対数１２０対、交差長１２０μｍ）、並列腕
のＳＡＷ共振器基本構成は（対数６０対、交差長９０μ
ｍ）である。In FIG. 5, the basic configuration of the SAW resonator of the series arm (logarithm 120 pairs, cross length 120 μm) is the basic configuration of the SAW resonator of parallel arm (logarithm 60 pairs, cross length 90 μm).
m).
【００３８】図６は図５の集中定数等価回路図、図９は
本発明のＣＤＭＡ用Ｔｘ−フィルタの周波数特性と従来
のＣＤＭＡ用Ｔｘ−フィルタの周波数特性を示す図であ
り、横軸に周波数（Ｈｚ）、縦軸に減衰量（ｄＢ）を示
しており、曲線ａは従来の回路構成の周波数特性を、本
発明の回路構成付加インピーダンスはインダクタで構成
し、曲線ｂはそのインダクタ値ＬをＬ0 ＝４．０（ｎ
Ｈ）とした場合の周波数特性を示している。、図１０は
従来のＣＤＭＡ用Ｔｘ−フィルタの開放、短絡インピー
ダンス特性図、図１１は本発明のＣＤＭＡ用Ｔｘ−フィ
ルタの開放、短絡インピーダンス特性図であり、図１０
及び図１１において、横軸に周波数（Ｈｚ）、縦軸にイ
ンピーダンス（Ω）を示しており、曲線ａは短絡インピ
ーダンスを、曲線ｂは開放インピーダンスをそれぞれ示
している。FIG. 6 is a lumped constant equivalent circuit diagram of FIG. 5, and FIG. 9 is a diagram showing the frequency characteristics of the CDMA Tx-filter of the present invention and the conventional CDMA Tx-filter. (Hz), the vertical axis represents the attenuation amount (dB), the curve a represents the frequency characteristic of the conventional circuit configuration, the circuit configuration additional impedance of the present invention is configured by an inductor, and the curve b represents the inductor value L thereof. L 0 = 4.0 (n
H) shows the frequency characteristics. 10 is an open / short circuit impedance characteristic diagram of the conventional CDMA Tx-filter, and FIG. 11 is an open / short circuit impedance characteristic diagram of the CDMA Tx-filter of the present invention.
In FIG. 11 and FIG. 11, the horizontal axis represents frequency (Hz) and the vertical axis represents impedance (Ω). Curve a represents short-circuit impedance and curve b represents open impedance.
【００３９】また、表１は従来の回路構成と本発明の基
本有極型フィルタとの比較を示している。Table 1 shows a comparison between the conventional circuit configuration and the basic polarized filter of the present invention.
【００４０】[0040]
【表１】 [Table 1]
【００４１】この表のＣＤＭＡ用Ｔｘ−フィルタの減衰
帯域（８６９．０〜８９４．０）ＭＨｚに注目すると、
Ｚ3O≠Ｚ3Sである。Focusing on the attenuation band (869.0 to 894.0) MHz of the Tx-filter for CDMA in this table,
Z 3O ≠ Z 3S .
【００４２】図１１には、本発明において、ＬO ＝４．
０（ｎＨ）の場合でＺ3O（ＬO ）≒Ｚ3Sである。この場
合の周波数特性は、図９における本発明の曲線ｂで、従
来の図９に示す曲線ａに比較して大幅に改善されて、要
求規格を満足することが判る。In FIG. 11, in the present invention, L O = 4.
In the case of 0 (nH), Z 3O (L O ) ≈Z 3S . It can be seen that the frequency characteristic in this case is significantly improved by the curve b of the present invention in FIG. 9 as compared with the conventional curve a shown in FIG. 9, and satisfies the required standard.
【００４３】従来技術と本発明の比較において、注目周
波数展として、８８９，８９５，９０１ＭＨｚについて
は表１に示す。In comparison between the prior art and the present invention, Table 1 shows 889, 895, 901 MHz as frequency bands of interest.
【００４４】図９及び表１から判るように、周波数特性
の通過帯域では従来技術と殆ど変化なく、減衰帯域の８
９５ＭＨｚにおいては、１３．１ｄＢ改善されているこ
とが判る。As can be seen from FIG. 9 and Table 1, there is almost no change in the pass band of the frequency characteristic from the conventional technique, and the attenuation band is 8
It can be seen that at 95 MHz, there is an improvement of 13.1 dB.
【００４５】次に、図１３は図２に示す基本有極型ＳＡ
Ｗフィルタの圧電基板のチップ１００の一構成図であ
る。Next, FIG. 13 shows the basic polarized SA shown in FIG.
It is a block diagram of the chip | tip 100 of the piezoelectric substrate of a W filter.
【００４６】この図において、１０１は入力端、１０２
は出力端であり、三つの直列腕ＳＡＷ共振器を５０，５
１，５２、二つの並列腕ＳＡＷ共振器を６０，６１、直
列腕ＳＡＷ共振器間の接続を８０，８１でまた直列腕Ｓ
ＡＷ共振器と並列腕ＳＡＷ共振器間の接続を８２，８
３、接地点を７０，７１，７２，７３，７４，７５，７
６で示す。ここでは、図１の本発明のＺA 部は７６で示
されている。すなわち、二つの並列腕ＳＡＷフィルタの
接地点の共通点を接地し、ワイヤボンディングパッド７
７を設ける。In this figure, 101 is an input terminal and 102
Is the output terminal, and the three series arm SAW resonators are 50, 5
1, 52, two parallel arm SAW resonators 60, 61, and connection between series arm SAW resonators 80, 81.
Connection between AW resonator and parallel arm SAW resonator is 82,8
3, ground points 70, 71, 72, 73, 74, 75, 7
Shown by 6. The Z A portion of the present invention of FIG. 1 is shown here at 76. That is, the common point of the ground points of the two parallel arm SAW filters is grounded, and the wire bonding pad 7
7 is provided.
【００４７】この二つの並列腕ＳＡＷ共振器６０，６１
の接地点の共通点は二つの並列腕ＳＡＷ共振器６０，６
１の背中合わせに構成し、二つの並列腕ＳＡＷ共振器６
０，６１の接地点の間の距離を最短になるように設定し
た。ワイヤボンディングパッド７７とチップ外のワイヤ
ボンディングパッド間とをワイヤボンディング線により
接続する。本構成はこのワイヤボンディング線をインダ
クタとして用いたものである。These two parallel arm SAW resonators 60, 61
The common point of the grounding points of the two parallel arm SAW resonators 60 and 6 is
Two parallel arm SAW resonators 6 configured back to back
The distance between the ground contact points of 0 and 61 was set to be the shortest. The wire bonding pads 77 and the wire bonding pads outside the chip are connected by wire bonding wires. The present configuration uses this wire bonding wire as an inductor.
【００４８】ここで、図１の本発明の第１実施例とし
て、図７の場合と同様のＣＤＭＡ用Ｔｘ−フィルタにつ
いて説明する。Here, as a first embodiment of the present invention shown in FIG. 1, a CDMA Tx-filter similar to that shown in FIG. 7 will be described.
【００４９】直列腕ＳＡＷ共振器：ＲS1１０，ＲS2１
１，ＲS3１２，並列腕ＳＡＷ共振器：ＲP1２０，ＲP2２
１，ＲP3２２）の各々３個の共振器で構成される。直列
腕ＳＡＷ共振器の基本構成は（対数１００対，交差長１
２０μｍ）、並列腕ＳＡＷ共振器の基本構成は（対数８
０対，交差長９０μｍ）である。Series-arm SAW resonator: R S1 10, R S2 1
1, R S3 12, parallel arm SAW resonator: R P1 20, R P2 2
1, R P3 22) and three resonators each. The basic configuration of the series arm SAW resonator is (logarithm 100 pairs, cross length 1
20 μm), the basic configuration of the parallel arm SAW resonator is (logarithm 8
0 pair, cross length 90 μm).
【００５０】図１２は本発明の第１実施例の５段有極型
ＳＡＷフィルタの周波数特性と従来の５段有極型ＳＡＷ
フィルタの周波数特性とを示す図であり、横軸に周波数
（Ｈｚ）、縦軸に減衰量（ｄＢ）を示している。すなわ
ち、図７のインダクタンス値ＬがＬO ＝１．０（ｎＨ）
の場合を、図１２の曲線ａに、また、本発明の回路構成
付加インピーダンスは同じインダクタンス値ＬがＬO ＝
１．０（ｎＨ）の場合を、図１２の曲線ｂに示す。FIG. 12 shows the frequency characteristics of the 5-stage polarized SAW filter of the first embodiment of the present invention and the conventional 5-stage polarized SAW.
It is a figure which shows the frequency characteristic of a filter, and the horizontal axis shows the frequency (Hz) and the vertical axis shows the amount of attenuation (dB). That is, the inductance value L in FIG. 7 is L O = 1.0 (nH)
In the case of the curve a in FIG. 12, and the circuit configuration added impedance of the present invention has the same inductance value L O =
The case of 1.0 (nH) is shown by the curve b in FIG.
【００５１】この場合の周波数特性は、図１２の曲線ｂ
に示すように、従来の図１２の曲線ａに比較して大幅に
改善されて、減衰域において高減衰特性が得られる。即
ち、図２に示す４段有極型ＳＡＷフィルタと図７の従来
の５段有極型ＳＡＷフィルタにおいて得られる特性は僅
かな改善はあるが、本発明の回路構成にすることによ
り、減衰特性において、大幅な改善特性が得られること
は図１２から明白である。The frequency characteristic in this case is the curve b in FIG.
As shown in FIG. 10, the curve a in FIG. 12 of the related art is significantly improved, and a high attenuation characteristic is obtained in the attenuation region. That is, although there is a slight improvement in the characteristics obtained in the four-stage polar SAW filter shown in FIG. 2 and the conventional five-stage polar SAW filter in FIG. 7, the attenuation characteristic is improved by the circuit configuration of the present invention. In FIG. 12, it is clear from FIG. 12 that a significant improvement characteristic is obtained.
【００５２】次に、本発明の第２実施例について図１４
を用いて説明する。図１４は本発明の第２実施例を示す
７段有極型ＳＡＷフィルタの構成図である。Next, the second embodiment of the present invention will be described with reference to FIG.
Will be explained. FIG. 14 is a configuration diagram of a 7-stage polar SAW filter showing a second embodiment of the present invention.
【００５３】この図において、７０〜７３は直列腕ＳＡ
Ｗ共振器、８０〜８３は並列腕ＳＡＷ共振器、ＺA ６，
ＺA ７は二端子対回路を構成するインピーダンスであ
る。In this figure, 70 to 73 are serial arms SA
W resonator, 80 to 83 are parallel arm SAW resonators, Z A 6,
Z A 7 is an impedance forming a two-terminal pair circuit.
【００５４】この第２実施例も図１の本発明の第１実施
例の場合と同様に、二等分回路の先端短絡インピーダン
スと先端開放インピーダンスの次数がＹm ＝０のため、
同じ傾向で、この回路構成も減衰帯域において、高減衰
特性を得ることができる。Also in the second embodiment, as in the case of the first embodiment of the present invention shown in FIG. 1, since the orders of the short-circuited tip impedance and the open-ended impedance of the bisector are Y m = 0,
With the same tendency, this circuit configuration can also obtain high attenuation characteristics in the attenuation band.
【００５５】なお、本発明は上記実施例に限定されるも
のではなく、本発明の趣旨に基づいて種々の変形が可能
であり、これらを本発明の範囲から排除するものではな
い。The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention, and these modifications are not excluded from the scope of the present invention.
【００５６】[0056]
【発明の効果】以上、詳細に説明したように、本発明に
よれば、二端子対回路の二つの直列腕ＳＡＷ共振器と二
つの並列腕ＳＡＷ共振器を用いた共振器形ＳＡＷフィル
タと二端子対回路のインピーダンスの直列接続により構
成される有極型ＳＡＷフィルタにおいて、二端子対回路
のインピーダンスにより減衰極を形成した有極型ＳＡＷ
フィルタを複数個用いた有極型ＳＡＷフィルタと梯子型
ＳＡＷフィルタの縦続構成の急峻な周波数特性を持つ高
性能低挿入損失の有極型ＳＡＷフィルタを実現すること
ができる。As described above in detail, according to the present invention, a resonator type SAW filter using two series arm SAW resonators and two parallel arm SAW resonators of a two-terminal pair circuit is provided. In a polarized SAW filter configured by series connection of impedances of a terminal pair circuit, a polarized SAW having an attenuation pole formed by impedance of a two terminal pair circuit
It is possible to realize a high-performance and low insertion loss polar SAW filter having a steep frequency characteristic of a cascaded structure of a polar SAW filter and a ladder SAW filter using a plurality of filters.
【図１】本発明の第１実施例を示す５段有極型ＳＡＷフ
ィルタの構成図である。FIG. 1 is a configuration diagram of a five-stage polar SAW filter showing a first embodiment of the present invention.
【図２】本発明の基本有極型ＳＡＷフィルタの構成図で
ある。FIG. 2 is a configuration diagram of a basic polarized SAW filter of the present invention.
【図３】図２の集中定数等価回路図である。FIG. 3 is a lumped constant equivalent circuit diagram of FIG.
【図４】基本有極型ＳＡＷフィルタの説明のための等価
回路（図３の二等分回路）図である。FIG. 4 is an equivalent circuit diagram (bisector circuit of FIG. 3) for explaining a basic polarized SAW filter.
【図５】従来の共振器型ＳＡＷフィルタの構成図であ
る。FIG. 5 is a configuration diagram of a conventional resonator type SAW filter.
【図６】図５の集中定数等価回路図である。FIG. 6 is a lumped constant equivalent circuit diagram of FIG.
【図７】５段有極型ＳＡＷフィルタの構成図である。FIG. 7 is a configuration diagram of a five-stage polar SAW filter.
【図８】本発明の説明のための回路図である。FIG. 8 is a circuit diagram for explaining the present invention.
【図９】本発明のＣＤＭＡ用Ｔｘ−フィルタの周波数特
性図である。FIG. 9 is a frequency characteristic diagram of a Tx-filter for CDMA of the present invention.
【図１０】従来のＣＤＭＡ用Ｔｘ−フィルタの開放、短
絡インピーダンス特性図（Ｌ0 ＝０）である。FIG. 10 is an open / short circuit impedance characteristic diagram (L 0 = 0) of a conventional CDMA Tx-filter.
【図１１】本発明のＣＤＭＡ用Ｔｘ−フィルタの開放、
短絡インピーダンス特性図（Ｌ0＝４．０ｎＨ）であ
る。FIG. 11: Opening of the Tx-filter for CDMA of the present invention,
A short circuit impedance characteristic diagram (L 0 = 4.0nH).
【図１２】本発明の第１実施例の５段有極型ＳＡＷフィ
ルタの周波数特性と従来の５段有極型ＳＡＷフィルタの
周波数特性とを示す図である。FIG. 12 is a diagram showing frequency characteristics of a 5-stage polarized SAW filter according to the first embodiment of the present invention and frequency characteristics of a conventional 5-stage polarized SAW filter.
【図１３】図２に示す基本有極型ＳＡＷフィルタの圧電
基板のチップの一構成図である。13 is a configuration diagram of a chip of a piezoelectric substrate of the basic polar SAW filter shown in FIG.
【図１４】本発明の第２実施例を示す７段有極型ＳＡＷ
フィルタの構成図である。FIG. 14 is a 7-stage polarized SAW showing a second embodiment of the present invention.
It is a block diagram of a filter.
５，６，７，８ 端子
Ｅ 接地端子
１０，１１ 二つの直列腕ＳＡＷ共振器
１３〜１８，２２，２３ ＳＡＷ共振器の等価回路
２０，２１ 二つの並列腕ＳＡＷ共振器
５０，５１，５２，７０〜７３ 直列腕ＳＡＷ共振器
６０，６１，８０〜８３ 並列腕ＳＡＷ共振器
１０１ 入力端
１０２ 出力端
２００ 共振器形ＳＡＷフィルタ（二端子対回路）
２０１ 二端子対回路
２０２ 梯子型ＳＡＷフィルタ
２０００ 有極型ＳＡＷフィルタ
ＺA ３，ＺB ３，ＺA ４，ＺA ６，ＺA ７ 二端子対
回路のインピーダンス5, 6, 7, 8 Terminal E Ground terminal 10, 11 Two series arm SAW resonators 13-18, 22, 23 SAW resonator equivalent circuit 20, 21 Two parallel arm SAW resonators 50, 51, 52, 70 to 73 Series arm SAW resonator 60, 61, 80 to 83 Parallel arm SAW resonator 101 Input end 102 Output end 200 Resonator type SAW filter (two terminal pair circuit) 201 Two terminal pair circuit 202 Ladder type SAW filter 2000 Yes Pole-type SAW filter Z A 3, Z B 3, Z A 4, Z A 6, Z A 7 Two-terminal pair circuit impedance
フロントページの続き (72)発明者 岡田 好生 東京都港区虎ノ門１丁目７番12号 沖電 気工業株式会社内 (72)発明者 駒崎 友和 東京都港区虎ノ門１丁目７番12号 沖電 気工業株式会社内 (56)参考文献 特開 平７−176979（ＪＰ，Ａ) 特開 平９−261002（ＪＰ，Ａ) 特開 平10−200370（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H03H 9/64 H03H 9/145 H03H 9/25 Front page continuation (72) Inventor Yoshio Okada 1-7-12 Toranomon, Minato-ku, Tokyo Inside Oki Electric Industry Co., Ltd. (72) Inventor Tomokazu Komazaki 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Kogyo Co., Ltd. (56) Reference JP-A-7-176979 (JP, A) JP-A-9-261002 (JP, A) JP-A-10-200370 (JP, A) (58) Fields investigated (Int .Cl. 7 , DB name) H03H 9/64 H03H 9/145 H03H 9/25
Claims (6)
第１の直列腕ＳＡＷ共振器と、 前記第１の直列腕ＳＡＷ共振器の両端に対して、一方の
電極がそれぞれ圧電基板上で接続された第１及び第２の
並列腕ＳＡＷ共振器と、 前記第１及び第２の並列腕ＳＡＷ共振器のそれぞれの他
方の電極が前記圧電基板上で接続された共通接地部とを
有しており、 前記共通接地部は、ボンディングワイヤを介して接地電
位に接続されており、かつ、前記有極型弾性表面波フィ
ルタの二等分回路に関する短絡インピーダンスは、前記
二等分回路に関する開放インピーダンスと実質的に等し
い ことを特徴とする有極型弾性表面波フィルタ。1. A connection between an input terminal and an output terminal
One of the first series arm SAW resonator and the other end of the first series arm SAW resonator is
First and second electrodes each having electrodes connected on a piezoelectric substrate
A parallel arm SAW resonator, and other ones of the first and second parallel arm SAW resonators.
One of the electrodes is connected to the common ground portion on the piezoelectric substrate.
The common grounding part has a grounding wire via a bonding wire.
The surface acoustic wave filter of the polar type
The short circuit impedance for the bisector of
Substantially equal to the open impedance for the bisector.
Yukyokugata surface acoustic wave filter, wherein the decoction.
タにおいて、 前記入力端子と前記第１の直列腕ＳＡＷ共振器との間に
接続された第２の直列腕ＳＡＷ共振器を有する ことを特
徴とする有極型弾性表面波フィルタ。2. The polarized surface acoustic wave fill according to claim 1.
Between the input terminal and the first series arm SAW resonator,
A polar-type surface acoustic wave filter having a connected second series-arm SAW resonator .
タにおいて、 前記出力端子と前記第１の直列腕ＳＡＷ共振器との間に
接続された第３の直列腕ＳＡＷ共振器を有することを特
徴とする有極型弾性表面波フィルタ。3. The polarized surface acoustic wave filter according to claim 2 , wherein the output terminal and the first series arm SAW resonator are provided between the output terminal and the first series arm SAW resonator.
A polarized surface acoustic wave filter having a third series arm SAW resonator connected thereto .
タにおいて、前記第３の直列腕ＳＡＷ共振器と前記出力端子との間
に、一方の電極が接続された第３の並列腕ＳＡＷ共振器
を有しており、 前記第３の並列腕ＳＡＷ共振器の他方の電極は接地電位
に接続されている ことを特徴とする有極型弾性表面波フ
ィルタ。4. The polarized surface acoustic wave filter according to claim 3 , wherein between the third series arm SAW resonator and the output terminal.
To the third parallel arm SAW resonator with one electrode connected to
And the other electrode of the third parallel arm SAW resonator has a ground potential.
Polarized surface acoustic wave filter characterized in that it is connected to .
タを複数段縦続接続させたことを特徴とする有極型弾性
表面波フィルタ。5. Yukyokugata elastic, characterized in that the polar SAW fill <br/> data according to claim 2, wherein were several cascaded
Surface wave filter.
た有極型弾性表面波フィルタにおいて、前記有極型弾性
表面波フィルタは送信用フィルタであることを特徴とす
る有極型弾性表面波フィルタ。6. as claimed in any one of claims 1 to 5
In a polarized surface acoustic wave filter,
The surface acoustic wave filter is a transmission type filter, and is a polar type surface acoustic wave filter.
Priority Applications (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02760297A JP3380417B2 (en) | 1997-02-12 | 1997-02-12 | Polarized surface acoustic wave filter |
| EP97120976A EP0862266B1 (en) | 1997-02-12 | 1997-11-28 | Surface-acoustic-wave filters with poles of attenuation created by impedance circuits |
| DE69722168T DE69722168T2 (en) | 1997-02-12 | 1997-11-28 | Acoustic surface wave filters with generated damping poles by impedance circuits |
| EP03003449A EP1326333B1 (en) | 1997-02-12 | 1997-11-28 | Surface-acoustic-wave filters with poles of attenuation created by impedance circuits |
| DE69738934T DE69738934D1 (en) | 1997-02-12 | 1997-11-28 | Acoustic surface acoustic wave filters with attenuation poles generated by impedance circuits |
| US08/993,580 US5905418A (en) | 1997-02-12 | 1997-12-18 | Surface-acoustic-wave filters with poles of attenuation created by impedance circuits |
| KR1019970078930A KR100325796B1 (en) | 1997-02-12 | 1997-12-30 | Surface-acoustic-wave filters with poles of attenuation created by impedance circuits |
| CN98103820A CN1190823A (en) | 1997-02-12 | 1998-02-11 | Surface acoustic filter with decay pole produced by impedance circuit |
| US09/484,282 USRE37639E1 (en) | 1997-02-12 | 2000-01-18 | Surface-acoustic-wave filters with poles of attenuation created by impedance circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02760297A JP3380417B2 (en) | 1997-02-12 | 1997-02-12 | Polarized surface acoustic wave filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10224178A JPH10224178A (en) | 1998-08-21 |
| JP3380417B2 true JP3380417B2 (en) | 2003-02-24 |
Family
ID=12225482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02760297A Expired - Fee Related JP3380417B2 (en) | 1997-02-12 | 1997-02-12 | Polarized surface acoustic wave filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3380417B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002141771A (en) | 2000-08-21 | 2002-05-17 | Murata Mfg Co Ltd | Surface acoustic wave filter |
| JP2003069381A (en) * | 2001-08-27 | 2003-03-07 | Matsushita Electric Ind Co Ltd | Surface acoustic wave filer and antenna duplexer employing the same |
| JP3913558B2 (en) * | 2002-01-22 | 2007-05-09 | 沖電気工業株式会社 | Polarized surface acoustic wave filter |
| JP2004248321A (en) * | 2004-04-22 | 2004-09-02 | Oki Electric Ind Co Ltd | Polar saw filter |
| CN102037645A (en) | 2008-11-27 | 2011-04-27 | 松下电器产业株式会社 | Antenna duplexer and communication device using same |
| JP2012049758A (en) * | 2010-08-26 | 2012-03-08 | Taiyo Yuden Co Ltd | Filter and duplexer |
| JP5955095B2 (en) * | 2012-05-22 | 2016-07-20 | スカイワークス・パナソニック フィルターソリューションズ ジャパン株式会社 | Elastic wave device |
-
1997
- 1997-02-12 JP JP02760297A patent/JP3380417B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10224178A (en) | 1998-08-21 |
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