JPH0358522A - Temperature characteristic compensation system for saw filter - Google Patents
Temperature characteristic compensation system for saw filterInfo
- Publication number
- JPH0358522A JPH0358522A JP19374689A JP19374689A JPH0358522A JP H0358522 A JPH0358522 A JP H0358522A JP 19374689 A JP19374689 A JP 19374689A JP 19374689 A JP19374689 A JP 19374689A JP H0358522 A JPH0358522 A JP H0358522A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- saw filter
- filter
- intermediate frequency
- band
- 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.)
- Granted
Links
Landscapes
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
- Superheterodyne Receivers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利川分野〕
本発明は第１中間周波フィルタとしてＳＡＷフィルタを
用いたダブルスーパーヘテロダイン受信機に関する．
〔従来の技術〕
自動車電話等のダブルスーパーヘテロダイン受１３機に
おいては、数＋ＨＩＩＺの第１中間周波数を使用してお
り、この周波数帯に適応するＳＡＷ（バンド・バス）フ
ィルタとしては、従来ＳＴ−カット水晶上に形成された
ものを１吏用している。DETAILED DESCRIPTION OF THE INVENTION [Industrial field in Icheon] The present invention relates to a double superheterodyne receiver using a SAW filter as a first intermediate frequency filter. [Prior art] Thirteen double superheterodyne receivers such as car phones use the first intermediate frequency of number + HIIZ, and as a SAW (band bus) filter adapted to this frequency band, the conventional ST- One piece is formed on cut crystal.
上述した従来のＳＡＷフィルタは、その中心周波数の温
度変動が−３０゜Ｃ〜＋６５゜Ｃの範囲で約１００ｐ師
と大きく、このように広い温度範囲でバンド・バス・フ
ィルタとして用いるためには、温度変動を見込んで所要
通過帯ｊｄ幅と比べて必要以上に広帯域のフィルタを用
いる必要があった．そして、このＳＡＷフィルタが広帯
域であるために、隣接チャンネル波からの妨害を受け易
いという欠点があった（第３図）．
〔課題を解決するためのｆ段〕
前記目的を達成するため、本発明に係るＳ Ａ Ｗフィ
ルタの温度特性？１１１ ｍ方式は、第１中間周波フィ
ルタとしてＳＡＷフィルタを用いたダブルスーパーヘテ
ロダイン受信機において、周囲の温度を検出する温度検
出部と、第１及び第２局発部と、該温度検出部からの情
報に基いて該第１及び第２局発部の発振周波数を制御し
、第２中間周波数を一定に保ちつつ第１中間周波数がＳ
ＡＷフィルタの中心周波数と同様の１１ｚ度特性を持つ
ように制御する制御部とを有するものである。The conventional SAW filter described above has a large temperature fluctuation of its center frequency of about 100p in the range of -30°C to +65°C, and in order to be used as a band bass filter in such a wide temperature range, it is necessary to In anticipation of temperature fluctuations, it was necessary to use a filter with a wider band than necessary compared to the required passband jd width. Since this SAW filter has a wide band, it has the disadvantage that it is susceptible to interference from adjacent channel waves (Figure 3). [F-stage to solve the problem] In order to achieve the above object, the temperature characteristics of the S A W filter according to the present invention are as follows. The 111m method is a double superheterodyne receiver that uses a SAW filter as the first intermediate frequency filter, and includes a temperature detection section that detects the ambient temperature, first and second local oscillation sections, and a temperature detection section that detects the ambient temperature. The oscillation frequencies of the first and second local oscillators are controlled based on the information, and the first intermediate frequency is kept constant while the second intermediate frequency is kept constant.
It has a control section that controls the AW filter so that it has the same 11z degree characteristic as the center frequency of the AW filter.
以下、本発明の一実施飼を図により説明する．第１図は
本発明の−実施関を示すブロック図である。Hereinafter, one example of feeding according to the present invention will be explained using figures. FIG. 1 is a block diagram showing an implementation of the present invention.
図において、１は第１の混合器、２はＳＡＷフィルタ、
３は第２のｆｆａ合器、４は第１局発部、５は第２局発
部、６は制御部、７は温度検出部である。In the figure, 1 is the first mixer, 2 is the SAW filter,
3 is a second ffa combiner, 4 is a first local oscillator, 5 is a second local oscillator, 6 is a controller, and 7 is a temperature detector.
湛度検出部７から出力される温度情報は制御部６へ渡さ
れ、制御部６はその悄報を基に第１局発部４及び第２局
発部５の発振周波数を、第１中間周波ｂ，ｂ’の周波数
がＳＡＷフィルタ２の中心周波数と同様の１１ｕ度変動
をし、かつ、第２中間周波Ｃの周波数が一定になるよう
に制御する．すなわち、制御部６は、高周波ａ′の周波
数をｆＲ、第１中間周波数をＩＦＩ、第２中間周波数を
■Ｆ２、第１局発周波数をｆ１１．第２局允周波数をｆ
Ｌ２とすると、ｆＲ−ｆＬ１ （またはｆ Ｒ −１
− ｆ １．１）ＩＦ１がＳＡＷフィルタ２の中心周波
数温度変動に追従するようにｆＬ１を制御し、ＩＦＩ−
ｆＬ２（またはＩＦ１−１−ｆＬ２）＝ＩＦ２が一定に
保たれるようにｆＬ２を制御する。したがって、本発明
によれば、第２図に示ずようにＳＡＷフィルタ２の・訃
域を所要通過帯域幅まで狭めることが可能となり、隣接
チャンネル波からの妨害に対し強くすることが可能とな
る。第２１７１において、ｆＯ位第１中間周波中心周波
数、ｆＡは隣接チャンネル波中心周波数をそれぞれ示す
．
〔発明の効果〕
以上説明したように本発明は、温度変動に対して第１中
間周波数を畠゛にＳＡＷフィルタ中心周波数に追従させ
ることにより、ＳＡＷフィルタの帯域を所要通過帯域幅
まで狭めることができ、このため隣接チャンネル波から
の妨害に対して強くなるという効果がある．The temperature information output from the flooding detection section 7 is passed to the control section 6, and the control section 6 adjusts the oscillation frequencies of the first local oscillation section 4 and the second local oscillation section 5 to the first intermediate oscillation frequency based on the temperature information. Control is performed so that the frequencies of frequencies b and b' fluctuate by 11 degrees, which is the same as the center frequency of the SAW filter 2, and the frequency of the second intermediate frequency C remains constant. That is, the control unit 6 sets the frequency of the high frequency a' to fR, the first intermediate frequency to IFI, the second intermediate frequency to ■F2, and the first local frequency to f11. The second station frequency is f
If L2, then fR-fL1 (or f R -1
- f1.1) Control fL1 so that IF1 follows the center frequency temperature fluctuation of SAW filter 2, and
fL2 is controlled so that fL2 (or IF1-1-fL2)=IF2 is kept constant. Therefore, according to the present invention, as shown in FIG. 2, it is possible to narrow the range of the SAW filter 2 to the required passband width, and it is possible to make it resistant to interference from adjacent channel waves. . In No. 2171, fO represents the first intermediate frequency center frequency, and fA represents the adjacent channel wave center frequency. [Effects of the Invention] As explained above, the present invention makes it possible to narrow the band of the SAW filter to the required passband width by making the first intermediate frequency follow the SAW filter center frequency in response to temperature fluctuations. This has the effect of making it more resistant to interference from adjacent channel waves.
第１図は本発明の一実施例を示すブロック図、第２図は
本発明のＳＡＷフィルタ減衰特性を示す図、第３図は従
来のＳＡＷフィルタ減衰特性を示す図である．
ｌ・・・第ｌの温合器 ２・・・ＳＡＷフィルタ３
・・・第２の混合器 ４・・・第１局発部５・・・
第２の局発部 ６・・・制御部７・・・温度検出部
ａ・・・高周波ｂ，ｂ’・・・第ｌ中間周波
Ｃ・・・第２中間川波
特許出頭人 日本電気株式会社
代 理 人 弁理士 菅 野 中第１園
第３図FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing the attenuation characteristics of a SAW filter of the present invention, and FIG. 3 is a diagram showing the attenuation characteristics of a conventional SAW filter. l...l-th warmer 2...SAW filter 3
...Second mixer 4...First local oscillator 5...
Second local oscillation part 6... Control part 7... Temperature detection part a... High frequency b, b'... 1st intermediate frequency C... 2nd intermediate river wave Patent applicant NEC Corporation Agent: Patent Attorney Kanno Naka Dai-Ien, Figure 3
Claims (1)
いたダブルスーパーヘテロダイン受信機において、周囲
の温度を検出する温度検出部と、第１及び第２局発部と
、該温度検出部からの情報に基いて該第１及び第２局発
部の発振周波数を制御し、第２中間周波数を一定に保ち
つつ第１中間周波数がＳＡＷフィルタの中心周波数と同
様の温度特性を持つように制御する制御部とを有するこ
とを特徴とするＳＡＷフィルタの温度特性補償方式。(1) In a double superheterodyne receiver that uses a SAW filter as the first intermediate frequency filter, there is a temperature detection section that detects the ambient temperature, first and second local oscillation sections, and information from the temperature detection section. a control unit that controls the oscillation frequencies of the first and second local oscillators based on the above, and controls the first intermediate frequency to have the same temperature characteristics as the center frequency of the SAW filter while keeping the second intermediate frequency constant; A temperature characteristic compensation method for a SAW filter, comprising:
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01193746A JP3088105B2 (en) | 1989-07-26 | 1989-07-26 | Temperature characteristic compensation method for SAW filter |
| GB9015768A GB2234127B (en) | 1989-07-18 | 1990-07-18 | Double superheterodyne receiver with arrangement for compensating for temperature-dependent performance characteristics of a surface acoustic wave filter |
| US07/895,141 US5204972A (en) | 1989-07-18 | 1992-06-05 | Arrangement for compensating for temperature dependent performance characteristics of surface acoustic wave filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01193746A JP3088105B2 (en) | 1989-07-26 | 1989-07-26 | Temperature characteristic compensation method for SAW filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0358522A true JPH0358522A (en) | 1991-03-13 |
| JP3088105B2 JP3088105B2 (en) | 2000-09-18 |
Family
ID=16313123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP01193746A Expired - Fee Related JP3088105B2 (en) | 1989-07-18 | 1989-07-26 | Temperature characteristic compensation method for SAW filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3088105B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH057166A (en) * | 1991-06-26 | 1993-01-14 | Nec Corp | Heterodyne receiver |
| FR2905537A1 (en) * | 2006-08-30 | 2008-03-07 | Thales Sa | Filter i.e. surface acoustic wave type filter, drift compensation permitting system for e.g. transmitter-channel, has device determining frequency shift to be applied to filter and with oscillators synchronized on frequency reference |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102015016462A1 (en) | 2015-12-21 | 2017-06-22 | Tesat-Spacecom Gmbh & Co.Kg | Method for operating a selection circuit device for signals |
-
1989
- 1989-07-26 JP JP01193746A patent/JP3088105B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH057166A (en) * | 1991-06-26 | 1993-01-14 | Nec Corp | Heterodyne receiver |
| FR2905537A1 (en) * | 2006-08-30 | 2008-03-07 | Thales Sa | Filter i.e. surface acoustic wave type filter, drift compensation permitting system for e.g. transmitter-channel, has device determining frequency shift to be applied to filter and with oscillators synchronized on frequency reference |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3088105B2 (en) | 2000-09-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |