JPS60259003A - Double frequency converter - Google Patents
Double frequency converterInfo
- Publication number
- JPS60259003A JPS60259003A JP11585984A JP11585984A JPS60259003A JP S60259003 A JPS60259003 A JP S60259003A JP 11585984 A JP11585984 A JP 11585984A JP 11585984 A JP11585984 A JP 11585984A JP S60259003 A JPS60259003 A JP S60259003A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- local oscillator
- signal
- output
- fif
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/16—Multiple-frequency-changing
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Superheterodyne Receivers (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
この発明は無線通信機に用いられ、２回周波数変換を行
う２重周波数変換器に関するものである。DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a dual frequency converter used in a wireless communication device, which performs frequency conversion twice.
「従来技術」
従来、周波数変換器は一般的にローワ−ローカル、つま
り出力周波数より低い周波数の局部発振器を用いていた
。また広帯域をカバーする周波数変換器としては、２重
周波数変換器が用いられていた。この２重周波数変換器
の一例を第２図に示す。中間周波増幅器などの信号源１
１からの周波数ｆｉの入力信号は第１ミキサー１２で第
１局部発振器１３からの周波数ｆＬ＋の第１局発信号と
周波数混合され、第１ミキサー１２の出力中の不要波は
第１ＩＦ用帯域Ｐ波器１４で除去され１１周周波数変換
器−ｆｉ ＋ ｆＬｌ （１）
の第１中間周波信号が取出され、この第１中間周波信号
は第１ＩＦ増幅器１５で増幅されて第２ミキサー１６へ
供給される。第２ミキサー１６には第２局部発振器１７
からの周波数ｆＬ２の第２局発信号も入力され、第２ミ
キサー１６の出力は第２ＩＦ用帯域Ｐ波器１８で不要波
が除去され、周波数
ｆｏ ” ｆＩＦ ＋ ｆＬ２ （２）の出力信号が取
出され、これが増幅器１９で増幅されて最デ冬出力とな
る。PRIOR ART In the past, frequency converters generally used lower-local oscillators, ie, local oscillators with a frequency lower than the output frequency. Furthermore, a dual frequency converter has been used as a frequency converter that covers a wide band. An example of this dual frequency converter is shown in FIG. Signal source 1 such as an intermediate frequency amplifier
The input signal of frequency fi from 1 is frequency-mixed with the first local oscillator signal of frequency fL+ from the first local oscillator 13 in the first mixer 12, and the unnecessary waves in the output of the first mixer 12 are mixed in the first IF band P. The first intermediate frequency signal of the 11-frequency frequency converter -fi + fLl (1) is removed by the frequency converter 14, and this first intermediate frequency signal is amplified by the first IF amplifier 15 and supplied to the second mixer 16. Ru. The second mixer 16 has a second local oscillator 17
A second local oscillator signal of frequency fL2 from the second mixer 16 is also input, unnecessary waves are removed from the output of the second mixer 16 by the second IF band P wave generator 18, and an output signal of frequency fo '' fIF + fL2 (2) is extracted. This is amplified by the amplifier 19 and becomes the most de-winter output.
第２局発信号の周波数ｆＬ２は第１局発信号周波数ｆＬ
＋と大きく異な９、一般に＋１倍（ｎは正の整数）であ
る。第１局部発振器１３の第１局発信号のｎ矢高周波（
ｎ ｆＬｌ ）及び第２局部発振器１７の第２局発信号
の一部はＡＰＣ回路２１に入力され、これら内入力が位
相比較され、その位相差によシ、周波数可変形の第２局
部発振器１７の発振周波数ｆＬ２が匍ｊ御されて
ｆ−ｎｆＬ□ （３）
２
とされる。The frequency fL2 of the second local oscillation signal is the first local oscillation signal frequency fL
9, which is significantly different from +, and is generally +1 times (n is a positive integer). n arrow high frequency of the first local oscillator signal of the first local oscillator 13 (
n fLl ) and a part of the second local oscillator signal of the second local oscillator 17 are input to the APC circuit 21, these inputs are compared in phase, and depending on the phase difference, the frequency variable second local oscillator 17 The oscillation frequency fL2 is controlled to be f−nfL□ (3) 2 .
（］） 、 （２） 、 （３）式より出力信号の周波
数ｆ。はｆｏ ＝ ｆｌ−４−ｆＬ、 ＋ ｎ ｘ ｆ
Ｌｌ−ｆｉ＋Ｃｎ＋１）ｆｒ、＋ （４）
となる。一般にｆ ＋’ （＜ ｆ ｏであるのでｆ。From equations (]), (2), and (3), the frequency f of the output signal. is fo = fl-4-fL, + n x f
Ll-fi+Cn+1)fr, + (4). In general, f +'(< f o, so f.
Φ（ｎ＋１）ｆＬｌであり、最終出力での許容周波数偏
差をΔＦとすると第１局部発振器１３の許容周波数偏差
はΔＦ
となる。Φ(n+1)fLl, and if the allowable frequency deviation at the final output is ΔF, then the allowable frequency deviation of the first local oscillator 13 is ΔF.
ｎ＋１
このように従来の２重周波数変換器においては第１局部
発振器の許容周波数偏差が小さく、高価なものとなった
。n+1 As described above, in the conventional dual frequency converter, the permissible frequency deviation of the first local oscillator is small, making it expensive.
この発明の目的は第１局部発振器の許容周波数１扁差が
従来よシも大きくても最終出力の許容周波数偏差が従来
と同一のものを得ることができる２重周波数変換器をｊ
長浜することにある。The purpose of this invention is to provide a dual frequency converter that can obtain the same allowable frequency deviation of the final output as the conventional one even if the allowable frequency deviation of the first local oscillator is larger than that of the conventional one.
There is something to do in Nagahama.
「発明の構成」
この発明によれば出力周波数よりも高い周波数の局部発
振器、いわゆるアッパーローカルを用いる。"Structure of the Invention" According to the present invention, a local oscillator with a frequency higher than the output frequency, a so-called upper local, is used.
「実施例」
第１図に第２図と対応する部分に同一符号を付けて示す
が、この発明では第１局部発振器１３の発振周波数ｆＬ
ｌを第１ミキサー１２の出力信号周波数’ＩＦよりも高
くシ、ｆＩＦ＋ｆ１とする。従って第１ＩＦ用帯域Ｐ波
器１４から周波数
ｆＩＦ ＝ ｆＬｌ ’ｉ （５）
の中間周波信号を取出す。−！た第２局部発振器１７の
発振周波数ｆＬ２も出力信号周波数ｆ。よりも高く、ｆ
Ｌ□＝ｆｏ十ｆＩＦとされる。帯域Ｐｉ器１８から周波
数
ｆｏ ” ’Ｌ２ ’ＩＦ （６）
の出力信号が取出される。``Embodiment'' In FIG. 1, parts corresponding to those in FIG. 2 are given the same reference numerals, but in this invention
Let l be higher than the output signal frequency 'IF of the first mixer 12, fIF+f1. Therefore, an intermediate frequency signal of frequency fIF=fLl'i (5) is extracted from the first IF band P-wave device 14. -! The oscillation frequency fL2 of the second local oscillator 17 is also the output signal frequency f. higher than f
It is assumed that L□=fo+fIF. An output signal of frequency fo ``'L2'' IF (6) is taken out from the band Pi device 18.
従って（３）、（５）、（６）式から出力信号周波数ｆ
。１ｔｆ−ｎｆｌ、２’ｔ、＋十ｆｉ
＝（ｎ−］ ） ｆＬＩ十ｆｉ（７）
となる。この（７ン式よシ最終出力信号の許容周波数偏
差をΔＦとすると前述と同じ手法にて第１局部ち２重周
波数変換器において第１、第２ミキサーでアッパーロー
カルをとることにより第１局部発振器１３の許容１ＪＴ
−ｉ差を従来より大きくとることができ、基準となる素
子、例えば水晶、キャビティＳＡＷ共振器等々の製作を
容易にすることができる。Therefore, from equations (3), (5), and (6), the output signal frequency f
. 1tf-nfl, 2't, +tenfi = (n-]) fLItenfi(7). If the allowable frequency deviation of the final output signal is ∆F, then by using the same method as described above, the first local Oscillator 13 allowable 1JT
-i difference can be made larger than in the past, making it easier to manufacture reference elements such as crystals, cavity SAW resonators, etc.
なおアッパーローカルを用いるとＦＭ変調極性等が逆転
するという問題があるが、この発明では２重周波数変換
器であるため２回周波数変換することによりＦ Ｍ変調
極性は元にもど９何等問題は生しない。Note that when upper local is used, there is a problem that the FM modulation polarity is reversed, but since this invention is a dual frequency converter, by converting the frequency twice, the FM modulation polarity is returned to its original state.9 No problem occurs. do not.
「発明の効果」
この発明によれば２重周波数変換器において、アッパー
ローカルをとるととにょシ、ローワ−ローカルの場合に
比べ基檗となる第１局部発振器の許容周波数偏差針７：
了倍にすることが可能となり、第１局部発振器の設計、
製造が容易となる。"Effects of the Invention" According to the present invention, in a dual frequency converter, when the upper local is taken, the permissible frequency deviation needle 7 of the first local oscillator, which is the base, compared to the lower local case:
design of the first local oscillator,
Manufacturing becomes easier.
第１図にこの発明の２重周波数変換器の一例を示すブロ
ック図、第２図は従来の２重周波数変換器を示すブロッ
ク図である。
特許出願人 日本電気株式会社
代 理 人 草 野 東FIG. 1 is a block diagram showing an example of a dual frequency converter of the present invention, and FIG. 2 is a block diagram showing a conventional dual frequency converter. Patent applicant Higashi Kusano, representative of NEC Corporation
Claims (1)
局発信号によシ第１ミキサーで周波数変換し、その周波
数変換出力を、第２局部発振器からの第２局発信号によ
り第２ミキサーで周波数変換して出力信号を得、上記第
２局発信号の周波数を上記第１局発信号の周波数のｎ（
正の整数）倍とした２重周波数変換器において、上記第
１局発信号の周波数は上記第１ミキサーからの周波数変
換出力の周波数よシも高く、また上記第２局発信号の周
波数は上記出力信号の周波数よりも高く選定されている
ことを特徴とする２重周波数変換器。(1) Convert the input signal of the signal source to the first local oscillator.
A first mixer performs frequency conversion according to the local oscillator, and the frequency conversion output is frequency-converted by a second mixer using a second local oscillator signal from a second local oscillator to obtain an output signal. The frequency of the signal is calculated by dividing the frequency of the first local signal by n(
In the double frequency converter, the frequency of the first local oscillation signal is higher than the frequency of the frequency conversion output from the first mixer, and the frequency of the second local oscillation signal is higher than the frequency of the frequency conversion output from the first mixer. A dual frequency converter characterized in that the frequency is selected higher than the frequency of the output signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11585984A JPS60259003A (en) | 1984-06-06 | 1984-06-06 | Double frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11585984A JPS60259003A (en) | 1984-06-06 | 1984-06-06 | Double frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60259003A true JPS60259003A (en) | 1985-12-21 |
Family
ID=14672907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11585984A Pending JPS60259003A (en) | 1984-06-06 | 1984-06-06 | Double frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60259003A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5697089A (en) * | 1993-12-21 | 1997-12-09 | Telefonaktiebolaget Lm Ericsson | Local oscillator having plural oscillators facilitating channel switching |
-
1984
- 1984-06-06 JP JP11585984A patent/JPS60259003A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5697089A (en) * | 1993-12-21 | 1997-12-09 | Telefonaktiebolaget Lm Ericsson | Local oscillator having plural oscillators facilitating channel switching |
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