JPH0152925B2 - - Google Patents
Info
- Publication number
- JPH0152925B2 JPH0152925B2 JP15438384A JP15438384A JPH0152925B2 JP H0152925 B2 JPH0152925 B2 JP H0152925B2 JP 15438384 A JP15438384 A JP 15438384A JP 15438384 A JP15438384 A JP 15438384A JP H0152925 B2 JPH0152925 B2 JP H0152925B2
- Authority
- JP
- Japan
- Prior art keywords
- conversion
- frequency
- balanced
- transformer
- unbalanced
- 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
Links
- 238000006243 chemical reaction Methods 0.000 claims description 43
- 230000010355 oscillation Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
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
- H03D7/14—Balanced arrangements
- H03D7/1408—Balanced arrangements with diodes
Description
【発明の詳細な説明】
産業上の利用分野
本発明はテレビジヨンチユーナをはじめとする
周波数変換回路、特に高周波周波数変換回路に関
するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to frequency conversion circuits such as television tuners, and particularly to high frequency frequency conversion circuits.
従来例の構成とその問題点
テレビジヨンチユーナをはじめとする高周波周
波数変換回路においては、従来よりバイポーラト
ランジスタ、ダイオードあるいはMOS電界効果
トランジスタ等による周波数変換装置として構成
される例が一般的である。Conventional configurations and their problems High frequency frequency conversion circuits such as television tuners have conventionally been configured as frequency conversion devices using bipolar transistors, diodes, MOS field effect transistors, or the like.
これらの半導体素子による周波数変換装置は、
回路構成の簡素さ、価格等の有利さが認められ、
テレビジヨンチユーナ等各方面に使用されてい
る。 Frequency conversion devices using these semiconductor elements are
Recognized for its simple circuit configuration and advantages in price,
It is used in various areas such as TV station.
しかしながら、米国のCATVに見られるよう
な広帯域多チヤンネル受信、あるいは今後発展が
期待される衛星放送受信のような超高周波広帯域
受信のたの周波数変換回路としては、従来の半導
体素子による変換回路においては、広帯域、かつ
多チヤンネル受信に対する非直線歪による妨害特
性において必ずしも満足できるものとは云えず、
ダイオードをリング接続した二重平衡型周波数変
換回路が近年採用されるケースが多くなつてき
た。 However, conventional conversion circuits using semiconductor elements cannot be used as frequency conversion circuits for wideband multi-channel reception as seen in CATV in the United States, or ultra-high frequency wideband reception such as satellite broadcast reception, which is expected to develop in the future. , it cannot be said that the interference characteristics due to non-linear distortion for wideband and multi-channel reception are necessarily satisfactory.
In recent years, double-balanced frequency conversion circuits with ring-connected diodes have been increasingly used.
第１図にリングダイオード接続構成の二重平衡
型ダイオード周波数変換装置の基本構成図を示
す。すなわち、高周波信号入力端子Ａより印加さ
れた信号RFは不平衡−平衡変換トランスT1によ
り平衡信号に変換され、リングダイオードD1〜
D4の対角線上の接続点a1−a2に入力される。 FIG. 1 shows a basic configuration diagram of a double-balanced diode frequency converter having a ring diode connection configuration. That is, the signal RF applied from the high frequency signal input terminal A is converted into a balanced signal by the unbalanced-balanced conversion transformer T1 , and the signal RF applied from the high frequency signal input terminal A is converted into a balanced signal by the unbalanced-balanced conversion transformer T1 ,
It is input to the connection point a 1 − a 2 on the diagonal of D 4 .
一、局部発振信号入力端子Ｂより局部発振信号
Lが同様に不平衡−平衡変換トランスT2により
平衡信号に変換され、リングダイオードD1〜D4
の一方の対角線上の接続点b1−b2に接続され、局
部発振入力側の変換トランスの平衡トランス側の
中点より周波数変換信号iFとして出力端子Ｃに
取り出される。 1.Local oscillation signal from local oscillation signal input terminal B
Similarly, L is converted to a balanced signal by an unbalanced-balanced conversion transformer T2 , and the ring diodes D1 to D4
It is connected to connection point b 1 -b 2 on one diagonal line of , and is taken out to output terminal C as a frequency conversion signal iF from the midpoint on the balanced transformer side of the conversion transformer on the local oscillation input side.
すなわち、周波数変換出力信号iFは、L±RF
なる周波数係の出力信号が取り出され、一方の周
波数成分を出力する周波数波回路が接続される
ことになる。 That is, the frequency conversion output signal iF is L ± RF
An output signal with a frequency coefficient of
第２図にその具体的な回路構成例を示す。 FIG. 2 shows a specific example of the circuit configuration.
以上のような実施例においては、周波数変換装
置の変換利得を向上し、かつダイオードによる非
直線歪を向上するため、局部発振信号注入レベル
の最適化、不平衡−平衡変換トランスの変換損失
の低減等の手段により最適動作設計を行なうとと
もに、これらの部品実装においても注意深く構成
し、所要の特性を確保しているのである。 In the embodiments described above, in order to improve the conversion gain of the frequency conversion device and the nonlinear distortion caused by the diode, the local oscillation signal injection level is optimized and the conversion loss of the unbalanced-balanced conversion transformer is reduced. In addition to designing optimal operation using these methods, we also carefully configure the mounting of these components to ensure the required characteristics.
また、特に高周波領域で広帯域変換動作を行な
おうとすると、問題となるのは変換トランスの挿
入損失の周波数特性、あるいはダイオードの変換
損失の周波数特性、更にはダイオードのバランス
性による変換損失の増加等、広帯域動作において
は従来例の周波数変換装置にもある程度の限界が
しられ、第３図に示すように高周波数での変換利
得の劣化が発生する。 In addition, when attempting to perform wideband conversion operations, especially in the high frequency range, problems arise such as the frequency characteristics of the insertion loss of the conversion transformer, the frequency characteristics of the conversion loss of the diode, and the increase in conversion loss due to the balance of the diode. In wideband operation, the conventional frequency converter has certain limitations, and as shown in FIG. 3, the conversion gain deteriorates at high frequencies.
今後の米国におけるCATVの多チヤンネル化、
あるいは衛星放送受信屋内受信機用変換装置等に
おいて広帯域化は更に進むものと考えられ、これ
等改善する新しい手段が望まれている。 Future multi-channel CATV in the United States,
In addition, it is thought that broadband conversion devices for indoor receivers for receiving satellite broadcasting will further progress, and new means for improving these devices are desired.
発明の目的
本発明は、このような二重平衡型ダイオード周
波数変換装置において、広帯域周波数変換装置と
して従来例における変換利得の周波数特性の改
善、更には微調整を可能にする新しい手法を提供
しようとするものである。Purpose of the Invention The present invention aims to provide a new method for improving the frequency characteristics of the conversion gain in a conventional wideband frequency conversion device and further enabling fine adjustment in such a double-balanced diode frequency conversion device. It is something to do.
発明の構成
この目的を達成するために本発明は、２つの不
平衡−平衡変換トランスの一方あるいは両方にイ
ンダクタンス素子を接続したものである。Structure of the Invention In order to achieve this object, the present invention connects an inductance element to one or both of two unbalanced-balanced conversion transformers.
実施例の説明
第４図に本発明の一実施例を示しており、従来
の実施例における接続点a1−a2及びb1−b2間に巻
線コイルによるインダクタンス素子L1，L2にい
ずれか、あるいは両方を接続したものである。DESCRIPTION OF EMBODIMENTS An embodiment of the present invention is shown in FIG. 4, in which inductance elements L 1 and L 2 formed by wire-wound coils are connected between connection points a 1 -a 2 and b 1 -b 2 in the conventional embodiment. Either or both are connected.
すなわち、これらの二重平衡型ダイオードミキ
サは、通常プリント基板に実装されれ、実装後に
おいては、a1−a2間、b1−b2間にはプリント基板
パターンによる浮遊容量CS1，CS2が存在し、これ
らの浮遊容量による、特に高周波高域周波数領域
における変換利得を劣化させる要因の一つであ
る。本発明はこの浮遊容量CS1，CS2を積極的に利
用し、CS1，CS2に並列接続されるインダクタンス
素子L1，L2を付加し、かつその並列共振周波数
を広帯域変換回路のほぼ上限の周波数近傍に設定
することにより、上限周波数近傍、すなわち高域
での変換利得劣化を改善している。その実施例に
おける改善特性を第５図に示す。 That is, these double-balanced diode mixers are usually mounted on a printed circuit board, and after mounting, there are stray capacitances C S1 and C between a 1 and a 2 and between b 1 and b 2 due to the printed circuit board pattern. S2 exists and is one of the factors that degrades the conversion gain due to these stray capacitances, especially in the high frequency range. The present invention makes active use of these stray capacitances C S1 and C S2 , adds inductance elements L 1 and L 2 connected in parallel to C S1 and C S2 , and adjusts the parallel resonance frequency to approximately the same as that of the wideband conversion circuit. By setting the frequency near the upper limit frequency, conversion gain deterioration near the upper limit frequency, that is, in the high frequency range is improved. The improved characteristics in this example are shown in FIG.
第５図に示す通り、低域ではインダクタンス素
子が並列接続されることにより変換損失の劣化が
みられるが、周波数特性のより平坦な特性として
得られる。また、実施例におけるインダクタンス
素子のインダクタンスを微調することにより、変
換利得の調整も任意に行なえる利点も合わせても
つているのである。 As shown in FIG. 5, in the low frequency range, the conversion loss is degraded due to the parallel connection of the inductance elements, but a flatter frequency characteristic is obtained. Furthermore, by finely adjusting the inductance of the inductance element in the embodiment, there is also the advantage that the conversion gain can be arbitrarily adjusted.
発明の効果
以上のように本発明によれば、比較的簡単な構
成により、広帯域周波数変換回路において、高域
周波数の変換利得低下を改善し、かつ周波数特性
の良好な回路を提供することができる。Effects of the Invention As described above, according to the present invention, with a relatively simple configuration, it is possible to improve conversion gain reduction in high frequencies and provide a circuit with good frequency characteristics in a wideband frequency conversion circuit. .
第１図は従来の二重平衡型ダイオード周波数変
換回路の基本構成を示す回路図、第２図は同回路
の具体例を示す回路図、第３図は従来例における
変換利得周波数特性を示す特性図、第４図は本発
明の一実施例による周波数変換回路の回路図、第
５図は本発明による変換利得周波数特性を示す特
性図である。
D1，D2，D3，D4……リングダイオード、T1，
T2……不平衡−平衡変換トランス、L1，L2……
インダクタンス素子。
Fig. 1 is a circuit diagram showing the basic configuration of a conventional double-balanced diode frequency conversion circuit, Fig. 2 is a circuit diagram showing a specific example of the same circuit, and Fig. 3 is a characteristic showing the conversion gain frequency characteristics of the conventional example. 4 is a circuit diagram of a frequency conversion circuit according to an embodiment of the present invention, and FIG. 5 is a characteristic diagram showing conversion gain frequency characteristics according to the present invention. D 1 , D 2 , D 3 , D 4 ...Ring diode, T 1 ,
T 2 ... Unbalanced-balanced conversion transformer, L 1 , L 2 ...
inductance element.
Claims (1)
イオードの接続からなる４つの接続点のうち対角
線上の２つの接続点に接続され高周波入力信号を
印加するための不平衡−平衡信号変換トランス
と、残りの対角線上の２つの接続点に接続され局
部発振信号を印加するための不平衡−平衡信号ト
ランスとを有し、前記２つの不平衡−平衡変換ト
ランスの一方あるいは両方にインダクタンス素子
を接続した周波数変換回路。1 Four diodes connected in a ring, an unbalanced-balanced signal conversion transformer connected to two diagonally connecting points of the four connecting points of the diodes for applying a high frequency input signal, and the rest and an unbalanced-balanced signal transformer for applying a local oscillation signal, which is connected to two diagonal connection points of the transformer, and an inductance element is connected to one or both of the two unbalanced-balanced conversion transformers. conversion circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15438384A JPS6132606A (en) | 1984-07-25 | 1984-07-25 | Frequency converting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15438384A JPS6132606A (en) | 1984-07-25 | 1984-07-25 | Frequency converting circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6132606A JPS6132606A (en) | 1986-02-15 |
| JPH0152925B2 true JPH0152925B2 (en) | 1989-11-10 |
Family
ID=15582938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15438384A Granted JPS6132606A (en) | 1984-07-25 | 1984-07-25 | Frequency converting circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6132606A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH028213U (en) * | 1988-06-30 | 1990-01-19 | ||
| JP5161887B2 (en) * | 2007-10-18 | 2013-03-13 | 株式会社アドバンテスト | Frequency converter and quadrature modulator |
-
1984
- 1984-07-25 JP JP15438384A patent/JPS6132606A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6132606A (en) | 1986-02-15 |
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