JP2008131435A - Ask transmitting/receiving apparatus - Google Patents

Ask transmitting/receiving apparatus Download PDF

Info

Publication number
JP2008131435A
JP2008131435A JP2006315289A JP2006315289A JP2008131435A JP 2008131435 A JP2008131435 A JP 2008131435A JP 2006315289 A JP2006315289 A JP 2006315289A JP 2006315289 A JP2006315289 A JP 2006315289A JP 2008131435 A JP2008131435 A JP 2008131435A
Authority
JP
Japan
Prior art keywords
frequency
idt
circuit
ask
saw
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.)
Withdrawn
Application number
JP2006315289A
Other languages
Japanese (ja)
Inventor
道明 ▲高▼木
Michiaki Takagi
Masahiro Konuki
正浩 小貫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Epson Corp
Miyazaki Epson Corp
Original Assignee
Seiko Epson Corp
Miyazaki Epson Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Seiko Epson Corp, Miyazaki Epson Corp filed Critical Seiko Epson Corp
Priority to JP2006315289A priority Critical patent/JP2008131435A/en
Publication of JP2008131435A publication Critical patent/JP2008131435A/en
Withdrawn legal-status Critical Current

Links

Images

Landscapes

  • Oscillators With Electromechanical Resonators (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Transceivers (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ASK transmitting/receiving apparatus reduced in the number of components. <P>SOLUTION: The present invention relates to an ASK transmitting/receiving apparatus comprising at least a SAW device formed on a piezoelectric plate, an amplifier, an SW circuit (analog switching circuit) and a demodulator, wherein the SAW device is a two-mode SAW element constituted by disposing at least a main IDT, a gate IDT, a sub IDT and a pair of reflectors. The main IDT is connected to the amplifier by the SW circuit to constitute an oscillation circuit, a terminal at a side of the sub IDT is brought into an open state and oscillated at a third frequency and an intermittent oscillation signal corresponding to an ASK data signal is outputted to constitute a transmission system. Furthermore, a terminal of the main IDT is connected to a receiving signal input side by the SW circuit, and the terminal at the side of the sub IDT is connected to the demodulator to constitute a receiving system for receiving and filtering the oscillation signal as a double-mode SAW filter with a frequency gap between a first frequency and a second frequency as a pass-bandwidth wherein the third frequency is arranged between the first frequency and the second frequency. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、水晶等の安定な周波数を発生できる圧電体SAW共振子を使用してASK変
調を直接に行うことができるASK変調器とその受信装置に関する。
The present invention relates to an ASK modulator that can directly perform ASK modulation using a piezoelectric SAW resonator that can generate a stable frequency, such as crystal, and a receiving apparatus thereof.

従来、圧電気を有する水晶STカット基板(圧電体平板の一例)を用いて構成するSA
W共振子を使用したASK送信装置がある。また前記のASK送信装置の送信信号を受信
するために、別途に構成したSAWフィルタを使用した受信装置を構成していた。前記の
SAW共振子については、その周波数温度特性が零温度係数をもち精度が良くかつ、所望
の周波数を直接発振が可能であるために、各種無線系の圧電発振器に使用されているが、
これはジッタが無く位相ノイズに優れた信号が高信頼性かつ低コストに容易に得られると
いう長所があるためである。
この理由から近年、乗用車のドアの自動開閉にはSAW共振子を用いた微弱無線機(キ
ーレスエントリー装置)が多数使用されるに至っている。
Conventionally, an SA formed using a quartz ST-cut substrate (an example of a piezoelectric flat plate) having piezoelectricity.
There is an ASK transmission device using a W resonator. In addition, in order to receive the transmission signal of the ASK transmitter, a receiver using a separately configured SAW filter has been configured. The SAW resonator is used in various types of wireless piezoelectric oscillators because its frequency temperature characteristic has a zero temperature coefficient, is accurate, and can directly oscillate a desired frequency.
This is because a signal having no jitter and excellent phase noise can be easily obtained with high reliability and low cost.
For this reason, in recent years, many weak wireless devices (keyless entry devices) using SAW resonators have been used for automatic opening and closing of passenger car doors.

特開平1−252016号公報JP-A-1-252016 特開平11−196139号公報JP 11-196139 A

しかしながら、前述の従来技術を使用したものはいずれも送信系と受信系を別途に構成
することが必要のため、(例えば、特許文献1および特許文献2参照)。このための部品
点数の増加による装置の大型化とコストアップが課題であった。特に最近になって、セン
サーネットワークが必要とされる時代においては、各種センサーの情報を中央処理装置に
伝送して処理することが必要であり、このために屋内等で使用される比較的近距離間の微
弱無線通信が必要であり、前述の送受信装置の小形化かつ低コスト化が急務となっている
However, any of those using the above-described conventional technology needs to separately configure a transmission system and a reception system (see, for example, Patent Document 1 and Patent Document 2). For this purpose, the increase in the size and cost of the apparatus due to the increase in the number of parts was a problem. In particular, in recent times when sensor networks are required, it is necessary to transmit information from various sensors to a central processing unit for processing. Weak wireless communication is necessary, and there is an urgent need to reduce the size and cost of the above-described transmitter / receiver.

本発明はかかる課題を解決するものでその目的とするところは、SAW共振子とSAW
フィルタを1個の素子内に一体化して構成して使用することによって、従来送信と受信系
を別体に構成してきたASK送受信装置を一体化して、低ジッタ,小形かつ低コストなA
SK送受信装置を市場に提供することにある。
The present invention solves this problem, and an object of the present invention is to provide a SAW resonator and a SAW.
By integrating the filter into a single element and using it, the ASK transmitter / receiver, which has been configured separately from the conventional transmission and reception systems, is integrated into a low jitter, small and low cost A.
The purpose is to provide SK transceivers to the market.

圧電体平板上に形成されたSAWデバイスと、増幅器とSW回路と復調器とを少なくと
も備えるASK送受信装置であって、SAWデバイスは、少なくとも主IDTとゲイトI
DTと副IDTと一対の反射器とを配置した2モード型SAW素子であり、かつ主IDT
をSW回路にて増幅器に接続して発振回路を構成し、かつ副IDT側の端子を開放状態と
して、第3の周波数で発振させ、かつASKデータ信号に対応して断続する発振信号を出
力して送信系を構成し、また、主IDTの端子をSW回路にて受信信号入力側に接続し、
かつ副IDT側の端子を復調器に接続して、第1の周波数と第2の周波数との周波数間を
通過帯域幅とする二重モード型SAWフィルタとなして、発振信号を受信して盧波する受
信系を構成し、第3の周波数を第1の周波数と第2の周波数との間に配設したことを特徴
とする。
An ASK transmitting / receiving apparatus including at least a SAW device formed on a piezoelectric plate, an amplifier, a SW circuit, and a demodulator, wherein the SAW device includes at least a main IDT and a gate I.
A two-mode SAW element in which a DT, a sub-IDT, and a pair of reflectors are arranged, and the main IDT
Is connected to the amplifier by the SW circuit to configure the oscillation circuit, and the terminal on the sub IDT side is opened, the oscillation is performed at the third frequency, and the intermittent oscillation signal is output corresponding to the ASK data signal. The transmission system is configured, and the main IDT terminal is connected to the reception signal input side by the SW circuit,
In addition, by connecting the terminal on the sub IDT side to the demodulator, a dual mode SAW filter having a passband width between the first frequency and the second frequency is obtained, and an oscillation signal is received. A wave receiving system is configured, and the third frequency is arranged between the first frequency and the second frequency.

この回路構成によれば、1個の二重モード型SAWフィルタを形成すれば、自動的に第
1の周波数と第2の周波数との周波数間を通過帯域幅とする二重モード型のSAWフィル
タと、第1の周波数と第2の周波数との間に位置する第3の周波数によって発振する発振
回路が構成可能となるため、SAW共振子とSAWフィルタの2つの機能を集約すること
ができ装置の小形化及び生産性面で有利となるという効果がある。
According to this circuit configuration, when a single dual mode SAW filter is formed, the dual mode SAW filter automatically sets the passband width between the first frequency and the second frequency. And an oscillation circuit that oscillates with a third frequency located between the first frequency and the second frequency can be configured, so that the two functions of the SAW resonator and the SAW filter can be integrated. This is advantageous in terms of downsizing and productivity.

以下本発明のASK送受信装置1の実施形態について、図1によって具体的回路の実施
例をブロック図にて説明した後、図2には本発明で使用される2個の機能が実現できる2
モード型SAW素子の具体的な構成を電極パターンを示す図により説明し、図3と図4で
は3個の周波数配置とSAW素子の特性との関係を説明し、図5において本発明のブロッ
ク図の動作状態の説明を行ない、さらに図6では受信装置として動作する場合の2モード
型SAW素子の接続状態を説明する。
Hereinafter, an embodiment of the ASK transmitting / receiving apparatus 1 of the present invention will be described with reference to a block diagram of an example of a specific circuit with reference to FIG. 1, and then two functions used in the present invention can be realized in FIG.
A specific configuration of the mode type SAW element will be described with reference to diagrams showing electrode patterns, FIGS. 3 and 4 will explain the relationship between the three frequency arrangements and the characteristics of the SAW element, and FIG. 5 is a block diagram of the present invention. FIG. 6 illustrates the connection state of the two-mode SAW element when operating as a receiving device.

図1は、ASK送受信装置1の一実施例について、その構成をブロック図にて図示した
ものである。
図1中の各部位は、C-MOS-ICあるいはトランジスタ等の能動素子によって形成し
た増幅器100、バイポーラあるいはMOSトランジス等より少なくともなるアナログス
イッチ回路(以降、SW回路と称する)101,102,105,106、SAW共振子
とSAWフィルタの2モードの機能を有する2モード型SAW素子104、SAWフィル
タとのインピーダンス終端整合をとるための抵抗素子103,107、受信系を構成する
ための復調器108である。またASK送信系のRF信号出力端子としての端子a、AS
Kデータ信号を入力するための端子b、SW回路101,102,105,106と2モ
ード型SAW素子104の出力状態制御するための制御信号入力端子としての端子c、ア
ンテナで受信したRF信号をSAWフィルタ(2モード型SAW素子104の機能)に接
続するためのRF入力端子としての端子d,d'、SAWフィルタ(2モード型SAW素
子104の機能)を通過して選択された第3の周波数f3とASKデータの周波数成分を
復調してもとのASKデータ信号とする復調器108の入力端子としての端子e,e'で
ある。図1において、増幅器100とSW回路101,102を端子SW1側に倒す状態
と、2モード型SAW素子104のSAW共振子の機能とでASK変調器を構成する。ま
た一方、SW回路101,102とSW回路105,106を端子SW2側に倒すことに
より、2モード型SAW素子104をSAWフィルタとして使用して、復調器108とあ
わせて受信系を構成する。
FIG. 1 is a block diagram illustrating the configuration of an embodiment of an ASK transmitting / receiving apparatus 1.
Each part in FIG. 1 includes an amplifier 100 formed by an active element such as a C-MOS-IC or a transistor, an analog switch circuit (hereinafter referred to as SW circuit) 101, 102, 105, which is composed of at least a bipolar or MOS transistor. 106, a two-mode SAW element 104 having a two-mode function of a SAW resonator and a SAW filter, resistance elements 103 and 107 for impedance termination matching with the SAW filter, and a demodulator 108 for constituting a receiving system is there. Also, terminals a and AS as RF signal output terminals of the ASK transmission system
A terminal b for inputting a K data signal, a terminal c as a control signal input terminal for controlling the output state of the SW circuits 101, 102, 105, and 106 and the two-mode SAW element 104, and an RF signal received by the antenna Terminals d and d ′ as RF input terminals for connection to the SAW filter (function of the two-mode SAW element 104), the third selected through the SAW filter (function of the two-mode SAW element 104) Terminals e and e ′ serving as input terminals of the demodulator 108 that generates the original ASK data signal by demodulating the frequency component of the frequency f3 and the ASK data. In FIG. 1, an ASK modulator is constituted by the state in which the amplifier 100 and the SW circuits 101 and 102 are tilted toward the terminal SW1 and the function of the SAW resonator of the two-mode SAW element 104. On the other hand, by tilting the SW circuits 101 and 102 and the SW circuits 105 and 106 to the terminal SW2 side, the two-mode SAW element 104 is used as a SAW filter, and a receiving system is configured together with the demodulator 108.

次に、図1の2モード型SAW素子104について図2を用いて説明する。
図2は本発明に使用する2モード型SAW素子104の電極パーンの配置を示す平面図
である。
最初に本発明の2モード型SAW素子104に使用する圧電体平板200の一例につい
て説明する。圧電体平板200は、例えば面内回転STカット水晶板でありレイリー型表
面波で動作するもので、水晶結晶の基本軸である電気軸Xと光軸Zの2軸が作る面を主面
とするY板を電気軸Xの回りに反時計方向にθ度(特に零温度係数が得られるθ=31度
から42度)回転した基板において、さらに基板の法線軸の回りに電気軸X軸からの面内
の回転角Ψが±(40〜46)度である方位を弾性表面波の位相伝播方位軸としたもので
ある。あるいはまた、圧電体平板200はSH型表面波で動作する水晶基板であってもよ
い。次に、圧電体平板200の表面を鏡面研磨した後、レイリー型あるいはSH型等の弾
性表面波の位相伝搬方向軸に対して直交して、例えば金属アルミニウムより少なくともな
る多数の平行導体の電極指を周期的に配置した少なくとも1個のすだれ状電極(以降、I
DTと称する)を構成し、その両側に一対の反射器を形成して1個の2モード型SAW素
子104を構成することができる。
Next, the two-mode SAW element 104 in FIG. 1 will be described with reference to FIG.
FIG. 2 is a plan view showing the arrangement of the electrode patterns of the two-mode SAW element 104 used in the present invention.
First, an example of the piezoelectric plate 200 used in the two-mode SAW element 104 of the present invention will be described. The piezoelectric flat plate 200 is, for example, an in-plane rotating ST-cut quartz plate and operates with a Rayleigh type surface wave. A plane formed by two axes of an electric axis X and an optical axis Z, which are basic axes of a quartz crystal, is defined as a main surface. In a substrate obtained by rotating a Y plate around the electrical axis X counterclockwise by θ degrees (especially θ = 31 degrees to 42 degrees at which a zero temperature coefficient is obtained), further from the electrical axis X axis around the normal axis of the substrate The orientation in which the in-plane rotation angle ψ is ± (40 to 46) degrees is the phase propagation azimuth axis of the surface acoustic wave. Alternatively, the piezoelectric flat plate 200 may be a quartz substrate that operates with an SH type surface wave. Next, after the surface of the piezoelectric flat plate 200 is mirror-polished, electrode fingers of a plurality of parallel conductors made of, for example, metal aluminum are orthogonal to the phase propagation direction axis of the Rayleigh type or SH type surface acoustic wave. At least one interdigital electrode (hereinafter, I
DT) and a pair of reflectors on both sides thereof to form one two-mode SAW element 104.

図2に示す2モード型SAW素子104は、圧電体平板200、反射器201,205
、主すだれ状電極としての主IDT202、副すだれ状電極としての副IDT204、ゲ
イトIDT203、主IDTへの正負極性の入力端子206、副IDTへの入力端子20
7とによって少なくとも構成されている。またIDT領域中の斜線で形成された部位は、
IDTの正負極性より少なくともなる電極指群への給電導体部位211であり、いずれも
前述のアルミニウム電極等の金属で形成されている。反射器201と主IDT202、ゲ
イトIDT203、副IDT204、反射器205の全体で1個の縦型の二重モード型S
AWフィルタを構成している。一方、2モード型SAW素子104を1モード型SAW素
子として使用する場合には、入力端子206を発振回路の増幅器100(図1参照)への
入出力端子g,g'(図1参照)に接続し、かつ入力端子207を開放状態とすればよい
The two-mode type SAW element 104 shown in FIG.
The main IDT 202 as the main interdigital electrode, the sub IDT 204 as the auxiliary interdigital electrode, the gate IDT 203, the positive / negative input terminal 206 to the main IDT, and the input terminal 20 to the sub IDT
7 at least. In addition, the part formed by oblique lines in the IDT region is
A feeding conductor portion 211 to the electrode finger group having at least positive and negative polarity of IDT, both of which are formed of a metal such as the aforementioned aluminum electrode. The reflector 201, the main IDT 202, the gate IDT 203, the sub IDT 204, and the reflector 205 as a whole are one vertical double mode type S.
An AW filter is configured. On the other hand, when the two-mode SAW element 104 is used as a one-mode SAW element, the input terminal 206 is connected to input / output terminals g and g ′ (see FIG. 1) to the amplifier 100 (see FIG. 1) of the oscillation circuit. It is only necessary to connect and to open the input terminal 207.

前述のSAWフィルタ動作状態においては、1個のSAWフィルタは表面波にて動作す
る2つの固有な振動状態としてのS0モードおよびA0モードをつくるが、両者は1個の
SAWフィルタ素子内において相互に弾性的に結合するように設計することが必要である
。この状態を効果的に形成するために、ゲイトIDT203のが必要である。STカット
の場合においては、このゲイトIDT203の電極周期長P(X)を、主IDT202と
副IDT204との電極周期長PT0に対して、大きく設定することにより振動の変位状
態を制御して、対称モードS0と斜対称モードA0を効果的に発生させることができる。
この場合の電極周期長比P(X)/PT0が1.02以上から1.04以下に設定すれば
十分な効果が期待できる。図2中の階段状の線208は2モード型SAW素子104の縦
方向(すなわち、弾性表面波の位相伝搬方向)に関して、電極指の周期長P(x)を図示
したものである。フィルタおよび共振子である2つの素子動作状態の説明はあらためて図
3と図4で行う。入力端子206に接続する主IDT202は、常に本発明のASK送受
信装置1の増幅回路100(図1参照)に接続されて、第3の周波数f3の状態をとって
振動する。
In the SAW filter operation state described above, one SAW filter creates two unique vibration states operating on surface waves, the S0 mode and the A0 mode, but both are mutually connected within one SAW filter element. It needs to be designed to be elastically coupled. In order to effectively form this state, the gate IDT 203 is necessary. In the case of ST cut, the electrode period length P (X) of the gate IDT 203 is set larger than the electrode period length PT0 of the main IDT 202 and the sub-IDT 204 to control the vibration displacement state, and is symmetric. Mode S0 and oblique symmetry mode A0 can be generated effectively.
In this case, if the electrode cycle length ratio P (X) / PT0 is set to 1.02 or more and 1.04 or less, a sufficient effect can be expected. A stepped line 208 in FIG. 2 illustrates the period length P (x) of the electrode fingers in the longitudinal direction of the two-mode SAW element 104 (that is, the phase propagation direction of the surface acoustic wave). The operation of the two elements, ie, the filter and the resonator, will be described again with reference to FIGS. The main IDT 202 connected to the input terminal 206 is always connected to the amplifier circuit 100 (see FIG. 1) of the ASK transmitting / receiving apparatus 1 of the present invention, and vibrates in the state of the third frequency f3.

前述した、主IDT202、ゲイトIDT203、副IDT204、はひとつのIDT
を3つに分割して形成することができる。
本発明の図2の2モード型SAW素子104の構成条件の1例を示すと、前述の水晶S
Tカットあるいは回転STカットにおいて、アルミ電極の膜厚みhと利用する弾性表面波
の波長λとの比h/λが0.02から0.03であり、IDTの総対数M=160対,主
IDT202が80対,副IDT204が80対,ゲイトIDT203は20対から40
対で電極周期比が1.02から1.04,IDTの交叉幅が40波長,反射器201,2
05は90本である。
The primary IDT 202, the gate IDT 203, and the secondary IDT 204 described above are one IDT.
Can be divided into three.
An example of the configuration conditions of the two-mode SAW element 104 of FIG.
In T-cut or rotational ST-cut, the ratio h / λ between the film thickness h of the aluminum electrode and the wavelength λ of the surface acoustic wave used is 0.02 to 0.03, and the total logarithm of IDT M = 160 pairs, 80 pairs of IDT 202, 80 pairs of secondary IDT 204, 20 to 40 of gate IDT 203
The electrode cycle ratio is 1.02 to 1.04, the crossing width of the IDT is 40 wavelengths, the reflectors 201 and 2
05 is 90 pieces.

次に、図3は、図1で説明した2モード型SAW素子104を縦型の二重モード型SA
Wフィルタを形成した場合のフィルタの伝送特性(動作伝送量SB、単位dB)を測定し
たものである。ただし、フィルタの終端インピーダンスは不整合状態にある。同図の横軸
は周波数変化率Δf/f0を単位PPM(10-6)で表した。またf0はSAWフィルタ
の中心周波数f0である。
Next, FIG. 3 shows the two-mode SAW element 104 described in FIG.
This is a measurement of the transmission characteristics (operating transmission amount SB, unit dB) of the filter when the W filter is formed. However, the termination impedance of the filter is in a mismatched state. The horizontal axis of the figure represents the frequency change rate Δf / f0 in the unit PPM (10 −6 ). F0 is the center frequency f0 of the SAW filter.

同図の曲線の左側のピーク402がA0モード、右側のピーク401がS0モードであ
る。A0モード(ピーク402)が共振周波数としての第1の周波数f1に対応し、S0
モード(ピーク401)が共振周波数としての第2の周波数f2に対応する。SAWフィ
ルタの通過帯域幅は第1の周波数f1と第2の周波数f2との間での範囲内で形成される
The left peak 402 of the curve in the figure is the A0 mode, and the right peak 401 is the S0 mode. The A0 mode (peak 402) corresponds to the first frequency f1 as the resonance frequency, and S0
The mode (peak 401) corresponds to the second frequency f2 as the resonance frequency. The passband width of the SAW filter is formed within a range between the first frequency f1 and the second frequency f2.

さらに、図4において前述の各周波数の配置関係を図示した。同図の横軸は周波数軸f
(Hz)であり、縦軸は共振子の特性であり、アドミタンスY(f)を単位としてdBで
表記しており、SAWフィルタの特性の場合には挿入損失SSをdB単位で表記した。挿
入損失SSの特性と動作伝送量SBはちょうど特性を上下反転した状態である。
Further, FIG. 4 shows the arrangement relationship of the aforementioned frequencies. The horizontal axis in the figure is the frequency axis f
(Hz), the vertical axis represents the characteristics of the resonator, and is expressed in dB with the admittance Y (f) as a unit. In the case of the characteristics of the SAW filter, the insertion loss SS is expressed in dB. The characteristics of the insertion loss SS and the operating transmission amount SB are just in the state of inverting the characteristics.

図4では、A0モードの共振周波数としての第1の周波数曲線502と、S0モードの
共振周波数としての第2の周波数曲線501と、2モード型SAW素子104をSAW共
振子の状態で使用した場合の第3の周波数曲線500Cとを示している。第1の周波数曲
線502の共振周波数としての第1の周波数f1と、第2の周波数曲線501の共振周波
数としての第2の周波数f2との間に、第3の周波数曲線500Cの共振周波数としての
第3の周波数f3が配設されている。また周波数曲線503はSAWフィルタとしての特
性であり、第1の周波数f1と第2の周波数f2とで形成された周波数範囲をほぼ包括し
ている。
In FIG. 4, when the first frequency curve 502 as the resonance frequency of the A0 mode, the second frequency curve 501 as the resonance frequency of the S0 mode, and the two-mode SAW element 104 are used in the state of the SAW resonator. A third frequency curve 500C of FIG. As the resonance frequency of the third frequency curve 500C, between the first frequency f1 as the resonance frequency of the first frequency curve 502 and the second frequency f2 as the resonance frequency of the second frequency curve 501. A third frequency f3 is provided. A frequency curve 503 is a characteristic as a SAW filter, and substantially includes a frequency range formed by the first frequency f1 and the second frequency f2.

次に、図5(a)〜(c)を用いて図1のブロック図の動作について説明する。
図5(a)〜(c)は、図1に対応したASK送受信装置1の動作波形を示すものであ
る。図5(a)は、増幅器100とSW回路101,102と2モード型SAW素子10
4とで構成される発振器で構成されたASK変調器へのASKデータ信号301である(
図1の端子bに対応)。ASKデータ信号301のH(hight)=+1、L(Low
)=0電位に対応してASK変調器のRF出力信号302が断続する。図5(b)は、A
SK変調器からのRF出力信号302であり(図1の端子aに対応)、ASKデータ信号
301(図5(a)参照)に対応して、第3の周波数f3で形成されたRF出力信号30
2が断続していることがわかる。図5(c)は、ASK送受信装置1が送信器として動作
する場合にはH(+1電位水準)とし、受信器として動作する場合にはL(0電位水準)
として、SW回路101,102,105,106(図1参照)の接続を切り換えるため
の制御信号303である(図1の端子cに対応する)。
Next, the operation of the block diagram of FIG. 1 will be described with reference to FIGS.
FIGS. 5A to 5C show operation waveforms of the ASK transmitting / receiving apparatus 1 corresponding to FIG. FIG. 5A shows an amplifier 100, SW circuits 101 and 102, and a two-mode SAW element 10.
4 is an ASK data signal 301 to an ASK modulator composed of an oscillator composed of 4 (
Corresponding to terminal b in FIG. 1). H (high) of the ASK data signal 301 = + 1, L (Low
) = 0, the RF output signal 302 of the ASK modulator is intermittent corresponding to the potential. FIG. 5 (b) shows A
RF output signal 302 from the SK modulator (corresponding to terminal a in FIG. 1), corresponding to ASK data signal 301 (see FIG. 5 (a)), RF output signal formed at the third frequency f3 30
It can be seen that 2 is intermittent. FIG. 5C shows H (+1 potential level) when the ASK transceiver 1 operates as a transmitter, and L (0 potential level) when it operates as a receiver.
Is a control signal 303 for switching the connection of the SW circuits 101, 102, 105, 106 (see FIG. 1) (corresponding to the terminal c in FIG. 1).

図6は、ASK送受信装置1を受信器として動作させる場合のSW回路101,102
,105,106の接続状態を示したものである。SW回路101,102,105,1
06は端子SW2側に倒されて、2モード型SAW素子104はSAWフィルタとして動
作している。この際に抵抗素子103と抵抗素子107はSAWフィルタの終端インピー
ダンスに整合して設定されており、アンテナからの受信信号は盧波されて復調器108に
入力される。復調器108からは再生されたASKデータが出力されることになる。
FIG. 6 shows SW circuits 101 and 102 when the ASK transceiver 1 is operated as a receiver.
, 105 and 106 are shown. SW circuits 101, 102, 105, 1
06 is tilted to the terminal SW2 side, and the two-mode SAW element 104 operates as a SAW filter. At this time, the resistance element 103 and the resistance element 107 are set to match the termination impedance of the SAW filter, and the received signal from the antenna is filtered and input to the demodulator 108. From the demodulator 108, the reproduced ASK data is output.

ちなみに、2モード型SAW素子104の説明において、水晶基板かつ縦型の二重モー
ドSAWフィルタにより説明したが、水晶以外の材料よりなる基板でもよく、また横型の
二重モードSAWフィルタにより、同様な機能を構成することができる。
Incidentally, in the description of the two-mode SAW element 104, a quartz substrate and a vertical double mode SAW filter have been described. However, a substrate made of a material other than quartz may be used, and a horizontal dual mode SAW filter may be used. Functions can be configured.

以上説明したように、本発明のASK送受信装置1は、SAWデバイス技術とIC技術
とを融合したことによって、部品点数を減らして小形化することができた。今後、ますま
す需要が増加すると考えられるセンサーシステム分野において、数メートルから数十メー
トル範囲でのデータ通信を可能にした安価なシステムとして、おおいに社会的貢献できる
と考える。
As described above, the ASK transceiver 1 of the present invention can be reduced in size by reducing the number of parts by integrating the SAW device technology and the IC technology. In the field of sensor systems, where demand is expected to increase in the future, we believe that it will be able to contribute greatly to society as an inexpensive system that enables data communication in the range of several meters to several tens of meters.

本発明のASK送受信装置の回路構成の一実施例を示すブロック図。The block diagram which shows one Example of the circuit structure of the ASK transmission / reception apparatus of this invention. 本発明のASK送受信装置の構成要素である2モード型SAW素子の一実施例を示す平面図。The top view which shows one Example of the 2 mode type | mold SAW element which is a component of the ASK transmission / reception apparatus of this invention. 本発明の2モード型SAW素子の一実施例が示すSAWフィルタの特性図。The characteristic view of the SAW filter which one Example of the 2 mode type | mold SAW element of this invention shows. 本発明の2モード型SAW素子の一実施例が示す他の特性図。The other characteristic view which one Example of the 2 mode type | mold SAW element of this invention shows. 本発明のASK送受信装置が示す信号特性図。The signal characteristic figure which the ASK transmission / reception apparatus of this invention shows. 本発明のASK送受信装置の一実施例における他の回路状態を示すブロック図。The block diagram which shows the other circuit state in one Example of the ASK transmission / reception apparatus of this invention.

符号の説明Explanation of symbols

100…増幅器、101,102,105,106…SW回路、104…2モード型S
AW素子、103,107…抵抗素子、108…復調器。
100 ... Amplifier, 101, 102, 105, 106 ... SW circuit, 104 ... 2-mode type S
AW element 103, 107 ... resistance element 108 ... demodulator.

Claims (1)

圧電体平板上に形成されたSAWデバイスと、増幅器とSW回路と復調器とを少なくと
も備えるASK送受信装置であって、
前記SAWデバイスは、少なくとも主IDTとゲイトIDTと副IDTと一対の反射器
とを配置した2モード型SAW素子であり、かつ前記主IDTを前記SW回路にて前記増
幅器に接続して発振回路を構成し、かつ前記副IDT側の端子を開放状態として、第3の
周波数で発振させ、かつASKデータ信号に対応して断続する発振信号を出力して送信系
を構成し、
また、前記主IDTの端子を前記SW回路にて受信信号入力側に接続し、かつ前記副I
DT側の端子を前記復調器に接続して、第1の周波数と第2の周波数との周波数間を通過
帯域幅とする二重モード型SAWフィルタとなして、前記発振信号を受信して盧波する受
信系を構成し、前記第3の周波数を前記第1の周波数と前記第2の周波数との間に配設し
たことを特徴とするASK送受信装置。
An ASK transmitting / receiving apparatus comprising at least a SAW device formed on a piezoelectric flat plate, an amplifier, a SW circuit, and a demodulator,
The SAW device is a two-mode SAW element in which at least a main IDT, a gate IDT, a sub-IDT, and a pair of reflectors are arranged, and the main IDT is connected to the amplifier by the SW circuit to provide an oscillation circuit. Configuring the transmission system by opening the terminal on the side of the secondary IDT, oscillating at the third frequency, and outputting an intermittent signal corresponding to the ASK data signal,
Further, the terminal of the main IDT is connected to the reception signal input side by the SW circuit, and the sub I
A terminal on the DT side is connected to the demodulator to form a dual mode type SAW filter having a pass band width between the first frequency and the second frequency, and the oscillation signal is received. An ASK transmitting / receiving apparatus comprising a wave receiving system, wherein the third frequency is disposed between the first frequency and the second frequency.
JP2006315289A 2006-11-22 2006-11-22 Ask transmitting/receiving apparatus Withdrawn JP2008131435A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2006315289A JP2008131435A (en) 2006-11-22 2006-11-22 Ask transmitting/receiving apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006315289A JP2008131435A (en) 2006-11-22 2006-11-22 Ask transmitting/receiving apparatus

Publications (1)

Publication Number Publication Date
JP2008131435A true JP2008131435A (en) 2008-06-05

Family

ID=39556833

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2006315289A Withdrawn JP2008131435A (en) 2006-11-22 2006-11-22 Ask transmitting/receiving apparatus

Country Status (1)

Country Link
JP (1) JP2008131435A (en)

Similar Documents

Publication Publication Date Title
CN113169722A (en) Elastic wave device, branching filter, and communication device
KR100701771B1 (en) Surface Acoustic Wave Resonator, Filter, Duplexer, Communication Apparatus and Method of Manufacturing Surface Acoustic Wave Resonator
US7230501B2 (en) Oscillation circuit and electronic equipment
JP2001203556A (en) Surface acoustic wave device, surface acoustic wave filter, and manufacturing method for the surface acoustic wave device
WO2020095586A1 (en) Elastic wave device, duplexer, and communication device
JP2009232242A (en) Acoustic wave element, filter, communication module, and communication apparatus
JP2006157174A (en) Antenna branching filter and surface acoustic wave filter for antenna branching filter
JP2016171571A (en) Acoustic wave element, antenna duplexer and electronic equipment
JP2008177886A (en) Fsk modulator
JP2008131435A (en) Ask transmitting/receiving apparatus
US20090152982A1 (en) Elastic wave device, filter device, communication module and communication apparatus
JP4415258B2 (en) Receiving machine
US6310524B1 (en) Edge reflection type longitudinally coupled saw resonator filter
JP4654879B2 (en) FSK modulator
JP2008141299A (en) Vertical type multimode saw resonator
JP2007228013A (en) Fsk transmitter-receiver
JP4534246B2 (en) Transmitter
JP2007150405A (en) Fsk modulator
JP2007266660A (en) Fsk transmitter
JP2006157557A (en) Surface acoustic wave device
JP2006014165A (en) Resonator type saw filter
JP2008228141A (en) Modulation circuit and transmitter
JP4337785B2 (en) FSK modulator
JPH10284981A (en) Surface acoustic wave device
JP2005303357A (en) Saw resonator

Legal Events

Date Code Title Description
A300 Withdrawal of application because of no request for examination

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 20100202