JP2003110449A - Frequency converter - Google Patents
Frequency converterInfo
- Publication number
- JP2003110449A JP2003110449A JP2001303227A JP2001303227A JP2003110449A JP 2003110449 A JP2003110449 A JP 2003110449A JP 2001303227 A JP2001303227 A JP 2001303227A JP 2001303227 A JP2001303227 A JP 2001303227A JP 2003110449 A JP2003110449 A JP 2003110449A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- frequency band
- circularly polarized
- intermediate frequency
- handed circularly
- 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
Landscapes
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Superheterodyne Receivers (AREA)
Abstract
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は，主にＢＳ放送と１
１０°ＣＳ放送の受信に用いる周波数変換装置に関し，
詳しくはその周波数変換装置の回路方式に関する。
【０００２】
【従来の技術】ＢＳ放送と１１０°ＣＳ放送の中間周波
数帯に用いる周波数変換装置であり右旋円偏波信号と左
旋円偏波信号の２系統からなる中間周波数帯の信号経路
を持ち，左旋円偏波信号の中間周波数帯の信号経路には
周波数変換回路を有する周波数変換装置において，従
来，信号経路の切換手段として，高周波切換ＩＣを用い
るのが一般的であり，信号経路間の局部発信周波数に対
するアイソレーション確保のため，信号経路の物理的距
離を確保したりシールドケース等でシールドを強化して
いた。
【０００３】
【発明が解決しようとする課題】しかし，従来のように
ＢＳ放送と１１０°ＣＳ放送の中間周波数帯に用いる周
波数変換装置であり，右旋円偏波信号と左旋円偏波信号
の２系統からなる中間周波数帯の信号経路を持ち，左旋
円偏波信号の中間周波数帯の信号経路には，周波数変換
回路を有する周波数変換装置において，信号経路間の局
部発信周波数に対するアイソレーション確保のため，信
号経路の物理的距離を確保するようプリント基板を大型
化したり，シールドケース等でシールド構造を強化する
方法を取っていたが，これらの方法ではコストがかかっ
ていた。こうした問題点に鑑み，本発明は，省スペース
で，簡素化したシールド方法で伝送経路間のアイソレー
ションを確保することを可能とする周波数変換装置を提
供することを課題とする。
【０００４】
【課題を解決するための手段】上記課題を解決するため
に，請求項1の発明は ＢＳ放送と１１０°ＣＳ放送の
中間周波数帯に用いる周波数変換装置であり，ＢＳ放送
並びに１１０°ＣＳ放送の右旋円偏波信号の中間周波数
帯の信号経路と，１１０°ＣＳ放送の左旋円偏波信号の
中間周波数帯の信号経路の２系統の信号経路を備え，１
１０°ＣＳ放送の左旋円偏波信号の中間周波数帯の信号
経路には周波数変換回路を設け，１１０°ＣＳ放送の左
旋円偏波信号の中間周波数帯を１１０°ＣＳ放送の右旋
円偏波信号の中間周波数帯より低い中間周波数帯に変換
するよう構成されており，右旋円偏波信号もしくは左旋
円偏波信号の中間周波数帯の信号経路を選択的に切換え
可能にした周波数変換装置において，前期信号経路の経
路切換手段として，２系統ある信号経路の入力側と出力
側に高周波切換部を設けるとともに，少なくとも，右旋
円偏波信号の中間周波数帯の信号経路を選択した時は，
左旋円偏波信号の中間周波数帯の信号経路への電源供給
を止めるように構成される。
【０００５】
【発明の実施の形態】以下に，本発明を具体化した実施
形態の１例を，図面を基に詳細に説明する。
【０００６】本発明の周波数変換装置は，ＢＳ放送と１
１０°ＣＳ放送の中間周波数帯に用いられるもので，Ｂ
Ｓ放送の右旋円偏波信号の中間周波数帯並びに，１１０
°ＣＳ放送の右旋円偏波信号の中間周波数帯と，１１０
°ＣＳ放送の左旋円偏波信号の中間周波数帯からなる２
系統の信号経路のうち，１１０°ＣＳ放送の左旋円偏波
信号の中間周波数帯を，１１０°ＣＳ放送の右旋円偏波
信号の中間周波数帯より低い中間周波数帯に周波数変換
するとともに，２系統の信号経路を選択的に切換え出力
するよう構成されたものである。
【０００７】まず，本発明の周波数変換装置に入力され
る周波数配列について説明する。ＢＳ放送の電波は右旋
円偏波信号で１１．７ＧＨｚ〜１２ＧＨｚ，１１０°Ｃ
Ｓ放送の電波は右旋円偏波信号と左旋円偏波信号を持
ち，周波数帯は右・左旋円偏波信号共に１２．２５ＧＨ
ｚ〜１２．７５ＧＨｚである。このうち右旋円偏波信号
は，衛星アンテナのＢＳ・ＣＳコンバーターの右旋円偏
波信号用の局部発振周波数である１０．６７８ＧＨｚに
よって，ＢＳ放送の右旋円偏波信号の中間周波数帯であ
る１０３２ＭＨｚ〜１３３５ＭＨｚと，ＣＳ放送の右旋
円偏波信号の中間周波数帯である１５９５ＭＨｚ〜２０
７１ＭＨｚに変換される。
【０００８】１１０°ＣＳ放送の左旋円偏波信号は，上
述のように１２．２５ＧＨｚ〜１２．７５ＧＨｚであ
り，衛星アンテナのＢＳ・ＣＳコンバーターの左旋円偏
波信号用の局部発振周波数である１０．１２７ＧＨｚに
よって，１１０°ＣＳ放送の左旋円偏波信号の中間周波
数帯である２１２６ＭＨｚ〜２６０２ＭＨｚへ変換さ
れ，ＢＳ放送の右旋円偏波信号の中間周波数帯である１
０３２ＭＨｚ〜１３３５ＭＨｚ（以下ＢＳと呼ぶ），１
１０°ＣＳ放送の右旋円偏波信号の中間周波数帯である
１５９５ＭＨｚ〜２０７１ＭＨｚ（以下ＣＳ−Ｒと呼
ぶ），１１０°ＣＳ放送の左旋円偏波信号の中間周波数
帯である２１２６ＭＨｚ〜２６０２ＭＨｚ（以下ＣＳ放
送の左旋円偏波信号の中間周波数帯を帯域に関わらずＣ
Ｓ−Ｌと呼ぶ）と周波数配列されて本発明の周波数変換
装置に入力されるシステムとなっている。本発明に係る
周波数変換装置の入力の周波数配列について図４（Ａ）
に示す。
【０００９】次にＢＳ，ＣＳ−ＲとＣＳ−Ｌからなる２
系統の信号経路について図１のブロック図を基に説明す
る。ＢＳ，ＣＳ−Ｒの信号経路は，本発明の周波数変換
装置の出力端子に入力された電圧がＤＣ１５Ｖの時選択
される。ＢＳ，ＣＳ―Ｒは入力端子１に入力された後，
選択手段である入力側の高周波切換部２の経路ａ側か
ら，ローパスフィルター３（以下ＬＰＦと呼ぶ），増幅
部４，ＬＰＦ５を通過して出力側の高周波切換部６の経
路ａ側から，最終段の増幅部７で増幅された後，出力端
子８から出力される。前記ＬＰＦ３，５はＣＳ−Ｌを阻
止帯域とするローパスフィルターである。この時，もう
一つの信号経路であるＣＳ−Ｌ側の電源供給は行わない
ように構成されている。
【００１０】ＣＳ−Ｌの信号経路は，本発明の周波数変
換装置の出力端子に入力された電圧がＤＣ１１Ｖの時選
択される。ＣＳ―Ｌは入力端子１入力された後，選択手
段である入力側の高周波切換部２の経路ｂ側から，ハイ
パスフィルター９（以下ＨＰＦと呼ぶ），増幅部１０，
周波数変換部１１で周波数変換され，増幅部１４，ＨＰ
Ｆ１５を通過してから出力側の高周波切換部６の経路ｂ
側を通して，最終段の増幅部７で増幅された後，出力端
子８より出力される。前記ＨＰＦ９，１５はＣＳ−Ｒを
阻止帯域とするハイパスフィルターである。ＣＳ−Ｌの
信号経路を構成している周波数変換部１１は，周波数変
換回路１２と局部発振器１３とからなる。局部発振周波
数は本発明の実施例では５５１ＭＨｚであり，入力され
たＣＳ−Ｌの周波数である２１２６ＭＨｚ〜２６０２Ｍ
Ｈｚを前記ＣＳ−Ｒの周波数より低い１５７５〜２０５
１ＭＨｚに変換するよう構成されている。本発明に係る
周波数変換装置の出力の周波数配列について図４（Ｂ）
に示す。
【００１１】次に信号経路の選択について図１，２，３
を用いて説明する。信号経路の入出力に設けた選択手段
である高周波切換部２，６の切換と，ＣＳ−Ｌの伝送経
路への電源供給の制御はコントロール回路１６によって
行われ，上述のように，ＢＳ，ＣＳ−Ｒの信号経路を選
択したときは，前記高周波切換切換部２，６を経路ａ側
に切換えるとともにＣＳ−Ｌへの電源供給を止めるよう
構成されている。これは，局部発振器１３から出る高調
波成分の内，特に局部発振周波数の２倍の高調波成分で
ある１１０２ＭＨｚがＢＳ，ＣＳ−Ｒの信号経路に飛び
込み，高調波成分のレベルが強いと，特にＢＳに妨害を
与えることがある事から，ＢＳ，ＣＳ−Ｒの信号経路を
選択したときは，ＣＳ−Ｌの信号経路への電源供給を止
める事で，局部発振器からの漏洩による妨害をなくすよ
うにするためである。
【００１２】高周波切換部２，６とＣＳ−Ｌへの電源供
給のコントロールについて詳細に説明する。高周波切換
部２，６とＣＳ−Ｌへの電源供給のＯＮ／ＯＦＦの切換
え判定は，本発明の周波数変換装置の出力端子８から，
同軸ケーブルを介して供給される電源電圧の高低（本発
明ではＢＳ，ＣＳ−Ｒを選択する場合はＤＣ１５Ｖ，Ｃ
Ｓ−Ｌを選択する場合はＤＣ１１Ｖ）を，コントロール
回路１６で比較することで行う。本発明では，コントロ
ール回路１６がコンパレーターからなり，コンパレータ
ーの基準電圧ＶＲＥＦをＤＣ６Ｖに設定し，比較電圧Ｖ
ＩＮがＤＣ６Ｖより高いときは，コンパレーターの出力
ＶＯＵＴがＯＦＦ，比較電圧ＶＩＮがＤＣ６Ｖより低い
ときは，コンパレーターの出力ＶＯＵＴがＯＮとなるよ
う構成されている。
【００１３】ＢＳ，ＣＳ−Ｒの信号経路を選択する電圧
は，詳しくはＤＣ１５Ｖの規格範囲であるＤＣ１３．５
〜１６．５Ｖであり，ＣＳ−Ｌの信号経路を選択する電
圧は，ＤＣ１１Ｖの規格範囲であるＤＣ９．５〜ＤＣ１
２Ｖである。この電圧において，信号経路を切換える判
定条件は，ＤＣ１２Ｖが本発明の周波数変換装置に入力
された時に，必ずＣＳ−Ｌの信号経路を選択することで
あり，ＤＣ１３．５Ｖが本発明の周波数変換装置に入力
された時に，必ずＢＳ，ＣＳ−Ｒの信号経路を選択する
ことである。この条件を満たすためには，ＤＣ１２Ｖが
本発明の周波数変換装置に入力された時にコンパレータ
ーの比較電圧ＶＩＮを基準電圧ＶＲＥＦ＝６Ｖよりやや
低くなるよう設定すれば良い。これによりコンパレータ
ーの出力ＶＯＵＴつまりコントロール回路１６の出力は
必ずＯＮ（ＤＣ６Ｖ）となりＣＳ−Ｌの信号経路が選択
される。例えばＲ１：Ｒ２＝１．１：１，ＶＲＥＦ＝６
Ｖとすると，周波数変換装置の入力電圧が
ＤＣ１２Ｖ入力時 ＶＩＮ＝１２＊１／（１．１＋１）
≒５．７１（Ｖ）≦ＶＲＥＦ
ＤＣ１３．５Ｖ入力時 ＶＩＮ＝１３．５＊１／（１．１＋１）
≒６．４５（Ｖ）≧ＶＲＥＦ
となり，本発明の周波数変換装置にＤＣ１２Ｖが入力さ
れた時はコンパレーターの出力ＶＯＵＴはＯＮ，つまり
コントロール回路１６の出力はＯＮとなりＣＳ−Ｌへ電
源供給する。本発明の周波数変換装置にＤＣ１３．５Ｖ
が入力された時はコンパレーターの出力ＶＯＵＴはＯＦ
Ｆ，つまりコントロール回路１６の出力はＯＦＦとなり
ＣＳ−Ｌへ電源供給を止める。但し，上述の例は，コン
トロール回路１６の１例について，その動作説明を行う
ため簡単な例を示したのであり，使用条件（例えば使用
温度範囲である−３０〜＋５０°Ｃなど）に対する各部
品のディレーティング等が考慮されていないので，適宜
各部品を最適化する必要がある。また，高周波切換部
２，６にはコントロール入力Ｖａ，Ｖｂを有し，コント
ロール入力Ｖａ，Ｖｂにはインバーター回路１９を通し
てコントロール回路の出力のＶＯＵＴが供給され，当該
ＶＯＵＴのＯＮ／ＯＦＦによりＶａ，Ｖｂに入力される
電圧を反転させることで，高周波切換部２，６の経路を
切換えている。尚，本発明は上記実施の形態に限定され
るものではない。本発明の趣旨を逸脱しない範囲で各部
の構成や回路等を適宜に変更して実施することも可能で
ある。
【００１４】
【発明の効果】以上詳述したように，請求項１の発明に
よれば， ＢＳ放送と１１０°ＣＳ放送の中間周波数帯
に用いる周波数変換装置であり，ＢＳ放送並びに１１０
°ＣＳ放送の右旋円偏波信号の中間周波数帯の信号経路
と，１１０°ＣＳ放送の左旋円偏波信号の中間周波数帯
の信号経路の２系統の信号経路を備え，１１０°ＣＳ放
送の左旋円偏波信号の中間周波数帯の信号経路には周波
数変換回路を設け，１１０°ＣＳ放送の左旋円偏波信号
の中間周波数帯を１１０°ＣＳ放送の右旋円偏波信号の
中間周波数帯より低い中間周波数帯に変換するよう構成
されており，右旋円偏波信号もしくは左旋円偏波信号の
中間周波数帯の信号経路を選択的に切換え可能にした周
波数変換装置において，前期信号経路の経路切換手段と
して，２系統ある信号経路の入力側と出力側に高周波切
換部を設けるとともに，少なくとも，右旋円偏波信号の
中間周波数帯の信号経路を選択した時は，左旋円偏波信
号の中間周波数帯の信号経路への電源供給を止めるよう
にしたので，プリント基板を大型化することなく，簡単
なシールドケースを使うだけで，伝送経路間のアイソレ
ーションの良い周波数変換装置を提供できる。Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention
Regarding a frequency conversion device used for receiving 10 ° CS broadcast,
Specifically, the present invention relates to a circuit system of the frequency converter. 2. Description of the Related Art A frequency converter used for an intermediate frequency band between a BS broadcast and a 110 ° CS broadcast, and a signal path of an intermediate frequency band including two systems of a right-handed circularly polarized signal and a left-handed circularly polarized signal. In a frequency conversion device having a frequency conversion circuit in a signal path of an intermediate frequency band of a left-handed circularly polarized signal, a high frequency switching IC is generally used as a signal path switching means. In order to ensure isolation from the local oscillation frequency, the physical distance of the signal path was secured or the shield was strengthened with a shield case or the like. [0003] However, as in the prior art, this is a frequency conversion device used for the intermediate frequency band between BS broadcasting and 110 ° CS broadcasting, and converts the right-handed circularly polarized signal and the left-handed circularly polarized signal. A signal path in the intermediate frequency band consisting of two systems, and a signal path in the intermediate frequency band of the left-handed circularly polarized signal is provided with a frequency conversion device having a frequency conversion circuit to ensure isolation of the local oscillation frequency between the signal paths. For this reason, methods of increasing the size of the printed circuit board to secure the physical distance of the signal path or strengthening the shield structure with a shield case or the like have been adopted, but these methods have been costly. In view of these problems, an object of the present invention is to provide a frequency conversion device which can secure isolation between transmission paths with a space-saving and simplified shielding method. [0004] In order to solve the above-mentioned problems, the invention of claim 1 is a frequency conversion device used for an intermediate frequency band between BS broadcasting and 110 ° CS broadcasting. It has two signal paths, a signal path in the intermediate frequency band of the right-handed circularly polarized signal of CS broadcasting and a signal path in the intermediate frequency band of the left-handed circularly polarized signal of 110 ° CS broadcasting.
A frequency conversion circuit is provided in the signal path of the intermediate frequency band of the left-handed circularly polarized signal of the 10 ° CS broadcast, and the intermediate frequency band of the left-handed circularly polarized signal of the 110 ° CS broadcast is converted into the right circularly polarized wave of the 110 ° CS broadcast. A frequency conversion device configured to convert the signal to an intermediate frequency band lower than the intermediate frequency band of the signal and capable of selectively switching the signal path of the intermediate frequency band of the right-handed circularly polarized signal or the left-handed circularly polarized signal. As a means for switching the signal path, a high-frequency switching section is provided on the input side and the output side of the two signal paths, and at least when the signal path of the intermediate frequency band of the right-hand circularly polarized signal is selected,
The power supply to the signal path of the intermediate frequency band of the left-handed circularly polarized signal is stopped. An embodiment of the present invention will be described below in detail with reference to the drawings. [0006] The frequency conversion apparatus of the present invention can be used for BS broadcasting and 1
It is used for the intermediate frequency band of 10 ° CS broadcasting.
The intermediate frequency band of the right-handed circularly polarized signal of S broadcast and 110
° The intermediate frequency band of the right-handed circularly polarized signal of CS broadcasting and 110
2 consisting of the intermediate frequency band of the left-handed circularly polarized signal of CS broadcasting
In the signal path of the system, the intermediate frequency band of the left-handed circularly polarized signal of the 110 ° CS broadcast is frequency-converted to an intermediate frequency band lower than the intermediate frequency band of the right-handed circularly polarized signal of the 110 ° CS broadcast. The signal path of the system is selectively switched and output. First, the frequency arrangement input to the frequency conversion device of the present invention will be described. The radio wave of the BS broadcast is a right-handed circularly polarized signal of 11.7 GHz to 12 GHz, 110 ° C.
The radio wave of S broadcast has a right-handed circularly polarized signal and a left-handed circularly polarized signal, and the frequency band is 12.25 GHz for both right and left-hand circularly polarized signals
z to 12.75 GHz. Of these, the right-handed circularly polarized signal is generated in the intermediate frequency band of the right-handed circularly polarized signal of the BS broadcast by 10.678 GHz which is the local oscillation frequency for the right-handed circularly polarized signal of the BS / CS converter of the satellite antenna. 1032 MHz to 1335 MHz, and 1595 MHz to 20 MHz, which is the intermediate frequency band of the right-hand circularly polarized signal of CS broadcasting
Converted to 71 MHz. The left-handed circularly polarized signal of the 110 ° CS broadcast is 12.25 GHz to 12.75 GHz as described above, and is a local oscillation frequency of 10 ° for the left-handed circularly polarized signal of the BS / CS converter of the satellite antenna. .127 GHz, it is converted into an intermediate frequency band of 2126 MHz to 2602 MHz, which is an intermediate frequency band of a left-handed circularly polarized signal of 110 ° CS broadcasting, and is 1 which is an intermediate frequency band of a right-handed circularly polarized signal of BS broadcasting.
032 MHz to 1335 MHz (hereinafter referred to as BS), 1
1595 MHz to 2071 MHz (hereinafter referred to as CS-R) which is an intermediate frequency band of a right-handed circularly polarized signal of 10 ° CS broadcasting, and 2126 MHz to 2602 MHz (hereinafter referred to as an intermediate frequency band of a left-handed circularly polarized signal of 110 ° CS broadcasting) Regardless of the intermediate frequency band of the left-handed circularly polarized signal of CS broadcasting,
(Referred to as S-L) and a frequency array is input to the frequency conversion device of the present invention. FIG. 4A shows an input frequency array of the frequency conversion device according to the present invention.
Shown in [0009] Next, 2 consisting of BS, CS-R and CS-L
The signal path of the system will be described based on the block diagram of FIG. The signal path of BS and CS-R is selected when the voltage input to the output terminal of the frequency converter of the present invention is DC15V. After BS and CS-R are input to input terminal 1,
From the path a of the high-frequency switching section 2 on the input side, which is a selection means, the low-pass filter 3 (hereinafter referred to as LPF), the amplifying sections 4 and the path a of the high-frequency switching section 6 on the output side through the LPF 5 After being amplified by the amplifying unit 7 of the stage, it is output from the output terminal 8. The LPFs 3 and 5 are low-pass filters using CS-L as a stop band. At this time, power is not supplied to the CS-L side, which is another signal path. The CS-L signal path is selected when the voltage input to the output terminal of the frequency converter of the present invention is DC 11V. After the CS-L is input to the input terminal 1, the high-pass filter 9 (hereinafter referred to as HPF), the amplifying unit 10,
The frequency is converted by the frequency conversion unit 11, and the amplification unit 14, the HP
The path b of the high-frequency switching unit 6 on the output side after passing through F15
The signal is amplified by a final-stage amplifying unit 7 through the side, and then output from an output terminal 8. The HPFs 9 and 15 are high-pass filters that use CS-R as a stop band. The frequency conversion unit 11 configuring the CS-L signal path includes a frequency conversion circuit 12 and a local oscillator 13. The local oscillation frequency is 551 MHz in the embodiment of the present invention, and is 2126 MHz to 2602 MHz which is the frequency of the input CS-L.
Hz is 1575 to 205 lower than the frequency of the CS-R.
It is configured to convert to 1 MHz. FIG. 4B shows the frequency arrangement of the output of the frequency conversion device according to the present invention.
Shown in Next, the selection of a signal path will be described with reference to FIGS.
This will be described with reference to FIG. The control circuit 16 controls the switching of the high-frequency switching units 2 and 6, which are selection means provided at the input and output of the signal path, and the control of power supply to the CS-L transmission path. When the -R signal path is selected, the high-frequency switching units 2 and 6 are switched to the path a and the power supply to the CS-L is stopped. This is because, among the harmonic components emitted from the local oscillator 13, 1102 MHz, which is a harmonic component twice as high as the local oscillation frequency, jumps into the BS and CS-R signal paths, and particularly when the level of the harmonic component is strong, When the BS or CS-R signal path is selected, power supply to the CS-L signal path is stopped so that interference from leakage from the local oscillator is eliminated. In order to The control of power supply to the high frequency switching units 2, 6 and CS-L will be described in detail. The ON / OFF switching of the power supply to the high-frequency switching units 2 and 6 and the CS-L is determined from the output terminal 8 of the frequency converter of the present invention.
The level of the power supply voltage supplied via the coaxial cable (in the present invention, when BS or CS-R is selected, DC15V, C
When selecting S-L, the control circuit 16 compares the voltages with each other. In the present invention, the control circuit 16 includes a comparator, sets the reference voltage VREF of the comparator to 6 V DC, and sets the comparison voltage VREF.
When IN is higher than DC6V, the output VOUT of the comparator is OFF, and when the comparison voltage VIN is lower than DC6V, the output VOUT of the comparator is ON. The voltage for selecting the BS and CS-R signal paths is, in detail, DC13.5 which is within the standard range of DC15V.
１６16.5 V, and the voltage for selecting the CS-L signal path is DC 9.5 to DC 1, which is the standard range of DC 11 V.
2V. At this voltage, the condition for switching the signal path is to always select the CS-L signal path when DC12V is input to the frequency converter of the present invention. Is to select the BS and CS-R signal paths. In order to satisfy this condition, the comparison voltage VIN of the comparator may be set to be slightly lower than the reference voltage VREF = 6 V when 12 V DC is input to the frequency converter of the present invention. As a result, the output VOUT of the comparator, that is, the output of the control circuit 16 is always turned on (DC 6 V), and the CS-L signal path is selected. For example, R1: R2 = 1.1: 1, VREF = 6
Assuming that the input voltage of the frequency converter is 12 V DC, VIN = 12 * 1 / (1.1 + 1) ７１5.71 (V) ≦ VREF 13.5 V DC, VIN = 13.5 * 1 / (1. 1 + 1) ≒ 6.45 (V) ≧ VREF, and when DC12V is input to the frequency converter of the present invention, the output VOUT of the comparator is ON, that is, the output of the control circuit 16 is ON and power is supplied to CS-L. I do. 13.5 V DC for the frequency converter of the present invention
Is input, the output VOUT of the comparator becomes OF
F, that is, the output of the control circuit 16 is turned off, and the power supply to CS-L is stopped. However, the above-described example shows a simple example for explaining the operation of one example of the control circuit 16, and shows each component for use conditions (for example, a use temperature range of −30 to + 50 ° C.). Therefore, it is necessary to appropriately optimize each component because the derating of the components is not taken into consideration. The high-frequency switching units 2 and 6 have control inputs Va and Vb, and the control inputs Va and Vb are supplied with the output VOUT of the control circuit through the inverter circuit 19, and are turned on and off by turning on / off the VOUT. , The paths of the high frequency switching units 2 and 6 are switched. Note that the present invention is not limited to the above embodiment. It is also possible to appropriately change the configuration, the circuit, and the like of each unit without departing from the spirit of the present invention. As described above in detail, according to the first aspect of the present invention, there is provided a frequency converter used for an intermediate frequency band between BS broadcasting and 110 ° CS broadcasting.
It has two signal paths, a signal path in the intermediate frequency band of the right-handed circularly polarized signal of the CS broadcast and a signal path in the intermediate frequency band of the left-handed circularly polarized signal of the 110 ° CS broadcast. A frequency conversion circuit is provided in the signal path of the intermediate frequency band of the left-handed circularly polarized signal, and the intermediate frequency band of the left-handed circularly polarized signal of 110 ° CS broadcasting is changed to the intermediate frequency band of the right-handed circularly polarized signal of 110 ° CS broadcasting. A frequency converter configured to convert the signal path into a lower intermediate frequency band and capable of selectively switching the signal path of the intermediate frequency band of the right-handed circularly polarized signal or the left-handed circularly polarized signal is provided. As the path switching means, high-frequency switching sections are provided on the input side and the output side of the two signal paths, and at least when the signal path in the intermediate frequency band of the right-hand circularly polarized signal is selected, the left-handed circularly polarized signal is output. Of intermediate frequency band Since the power supply to the signal path is stopped, a frequency converter with good isolation between transmission paths can be provided only by using a simple shield case without increasing the size of the printed circuit board.
【図面の簡単な説明】
【図１】 本発明に係る周波数変換装置の実施例のブロ
ック図を示す。
【図２】 経路選択時の各部の電圧を示す。
【図３】 コントロール回路の実施例を示す。
【図４】 本発明に係る周波数変換装置の，（Ａ）は入
力信号の周波数配列を示し，（Ｂ）は出力の周波数配列
を示す。
【符号の説明】
１…入力端子，２…高周波回路切換部，３…ＬＰＦ，４
…増幅部，５…ＬＰＦ，６…高周波回路切換部，７…終
段の増幅部，８…出力端子，９…ＨＰＦ，１０…増幅
部，１１…周波数変換部，１２…周波数変換回路，１３
…局部発振器，１４…増幅部，１５…ＨＰＦ，１６…コ
ントロール回路，１７…定電圧電源，１８…電源分離コ
イル，１９…インバーター回路BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a block diagram of an embodiment of a frequency conversion device according to the present invention. FIG. 2 shows voltages of respective units when a route is selected. FIG. 3 shows an embodiment of a control circuit. FIG. 4A shows a frequency arrangement of an input signal, and FIG. 4B shows an output frequency arrangement of the frequency converter according to the present invention. [Description of Signs] 1 ... input terminal, 2 ... high frequency circuit switching unit, 3 ... LPF, 4
.. Amplifying section, 5 LPF, 6 High-frequency circuit switching section, 7 Final stage amplifying section, 8 Output terminal, 9 HPF, 10 Amplifying section, 11 Frequency converting section, 12 Frequency converting circuit, 13
... Local oscillator, 14 ... Amplifier, 15 ... HPF, 16 ... Control circuit, 17 ... Constant voltage power supply, 18 ... Power supply separation coil, 19 ... Inverter circuit
Claims (1)
帯に用いる周波数変換装置であり，ＢＳ放送並びに１１
０°ＣＳ放送の右旋円偏波信号の中間周波数帯の信号経
路と，１１０°ＣＳ放送の左旋円偏波信号の中間周波数
帯の信号経路の２系統の信号経路を備え，１１０°ＣＳ
放送の左旋円偏波信号の中間周波数帯の信号経路には周
波数変換回路を設け，１１０°ＣＳ放送の左旋円偏波信
号の中間周波数帯を１１０°ＣＳ放送の右旋円偏波信号
の中間周波数帯より低い中間周波数帯に変換するよう構
成されており，前記右旋円偏波信号もしくは左旋円偏波
信号の中間周波数帯の信号経路を選択的に切換え可能に
した周波数変換装置において，前期信号経路の経路切換
手段として，２系統ある信号経路の入力側と出力側に高
周波切換部を設けるとともに，少なくとも，右旋円偏波
信号の中間周波数帯の信号経路を選択した時は，左旋円
偏波信号の中間周波数帯の信号経路への電源供給を止め
るようにしたことを特徴とする周波数変換装置。Claims 1. A frequency converter for use in an intermediate frequency band between a BS broadcast and a 110 ° CS broadcast.
A signal path of an intermediate frequency band of a right-handed circularly polarized signal of 0 ° CS broadcasting and a signal path of an intermediate frequency band of a left-handed circularly polarized signal of 110 ° CS broadcasting are provided.
A frequency conversion circuit is provided in the signal path of the intermediate frequency band of the left-handed circularly polarized signal of the broadcast, and the intermediate frequency band of the left-handed circularly polarized signal of the 110 ° CS broadcast is interposed between the right-handed circularly polarized signal of the 110 ° CS broadcast. A frequency converter configured to convert the signal path into an intermediate frequency band lower than the frequency band, wherein the signal path of the intermediate frequency band of the right-handed circularly polarized signal or the left-handed circularly polarized signal can be selectively switched. As a path switching means for the signal path, high frequency switching sections are provided on the input side and the output side of the two signal paths, and at least when the signal path in the intermediate frequency band of the right-hand circularly polarized signal is selected, the left-hand circular path is used. A frequency converter characterized in that power supply to a signal path of an intermediate frequency band of a polarization signal is stopped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001303227A JP2003110449A (en) | 2001-09-28 | 2001-09-28 | Frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001303227A JP2003110449A (en) | 2001-09-28 | 2001-09-28 | Frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003110449A true JP2003110449A (en) | 2003-04-11 |
Family
ID=19123352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001303227A Pending JP2003110449A (en) | 2001-09-28 | 2001-09-28 | Frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003110449A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015095825A (en) * | 2013-11-13 | 2015-05-18 | 日本放送協会 | Signal processor and broadcast wave receiver |
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|---|---|---|---|---|
| JP2000224061A (en) * | 1999-01-27 | 2000-08-11 | Sharp Corp | Broadcasting receiver and clock operating circuit |
| JP2001007726A (en) * | 1999-06-18 | 2001-01-12 | Fujitsu Ten Ltd | Plural band receiver |
| JP2001024545A (en) * | 1999-07-12 | 2001-01-26 | Matsushita Electric Ind Co Ltd | Ask modulating/demodulating radio equipment |
| JP2001186037A (en) * | 1999-10-14 | 2001-07-06 | Maspro Denkoh Corp | Satellite reception converter, block converter, down converter and satellite reception system |
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2001
- 2001-09-28 JP JP2001303227A patent/JP2003110449A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000224061A (en) * | 1999-01-27 | 2000-08-11 | Sharp Corp | Broadcasting receiver and clock operating circuit |
| JP2001007726A (en) * | 1999-06-18 | 2001-01-12 | Fujitsu Ten Ltd | Plural band receiver |
| JP2001024545A (en) * | 1999-07-12 | 2001-01-26 | Matsushita Electric Ind Co Ltd | Ask modulating/demodulating radio equipment |
| JP2001186037A (en) * | 1999-10-14 | 2001-07-06 | Maspro Denkoh Corp | Satellite reception converter, block converter, down converter and satellite reception system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015095825A (en) * | 2013-11-13 | 2015-05-18 | 日本放送協会 | Signal processor and broadcast wave receiver |
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