JPS59143121U

JPS59143121U - attenuation circuit

Info

Publication number: JPS59143121U
Application number: JP3661683U
Authority: JP
Inventors: 大戸　秀起
Original assignee: 株式会社東芝
Priority date: 1983-03-14
Filing date: 1983-03-14
Publication date: 1984-09-25

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図はＳＨＦ衛星放送受信システムに於いて、ＵＨＦ
帯の信号に変換された放送信号をＶＨＦ帯の信号に変換
するコンバータを示す回路図、第２図は従来の減衰回路
を示す回路図、第３図は第２図の減衰特性を示す特性図
、第４図はこの考案に係る減衰回路の一実施例を示す回
路図、第５図は第４図の減衰特性を示す特性図である。４１・・・入力端子、４２，４７．４９・・・ピンダイ
オード、４３．５０・・・インダクタ、４４．５１・・
・コンデンサ、４５．５２・・・直列共振回路、４６・
・・　　　　　゛結合コンデンサ、４８・・・出力端子
、５３・・・抵抗、５４．５５．５８・・・チョークコ
イル、５６．５７・・・制御電圧供給端子。第５図１　　　　　　　１．５　　ＧＨ２ −周琥秋Figure 1 shows the UHF satellite broadcast receiving system.
Figure 2 is a circuit diagram showing a conventional attenuation circuit, and Figure 3 is a characteristic diagram showing the attenuation characteristics of Figure 2. , FIG. 4 is a circuit diagram showing an embodiment of the attenuation circuit according to this invention, and FIG. 5 is a characteristic diagram showing the attenuation characteristics of FIG. 4. 41...Input terminal, 42,47.49...Pin diode, 43.50...Inductor, 44.51...
・Capacitor, 45.52...Series resonant circuit, 46・
... Coupling capacitor, 48... Output terminal, 53... Resistor, 54.55.58... Choke coil, 56.57... Control voltage supply terminal. Figure 5 1 1.5 GH2 - Zhou Huqiu

Claims

[Scope of utility model registration request]

A first capacitor diode inserted between the input terminal and the reference potential terminal, a second capacitor diode inserted between the input terminal and the output terminal, and a third capacitor inserted between the output terminal and the reference potential terminal. In the attenuation circuit having a diode, a first capacitive diode having a resonant frequency lower (or higher) than a frequency band of a signal applied to the input terminal in a path from the first capacitive diode to the reference potential terminal. A resonant circuit is formed, and a second resonant circuit having a resonant frequency higher (or lower) than the frequency band of the input signal is formed in a path from the third capacitance diode to the reference potential end. Characteristic attenuation circuit.