JPS5972078U

JPS5972078U - CATV converter

Info

Publication number: JPS5972078U
Application number: JP16707782U
Authority: JP
Inventors: 貞夫矢口; 阿波　裕一
Original assignee: ミツミ電機株式会社
Priority date: 1982-11-04
Filing date: 1982-11-04
Publication date: 1984-05-16

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図は一般に使用されているＣＡＴＶ用コンバータの
回路ブロック図、第２図は本考案の一実施例になる中間
周波増巾部の具体的回路図、第３図は従来（点線）及び
本考案（実線）の複同調回路の選択度特性を夫々示す。２．８・・・混合器、３・・・周波数可変発振器、４・
・・中間周波増巾器、５，７・・・複同調回路、６・・
・増巾器、９・・・固定発振器、Ｌ１〜Ｌ８・・・コイ
ル、Ｃ□〜Ｃ８・・・コンデンサ。Fig. 1 is a circuit block diagram of a commonly used CATV converter, Fig. 2 is a specific circuit diagram of an intermediate frequency amplifying section that is an embodiment of the present invention, and Fig. 3 is a conventional (dotted line) and a conventional (dotted line) The selectivity characteristics of the double-tuned circuit of the invention (solid line) are shown. 2.8... Mixer, 3... Frequency variable oscillator, 4.
...Intermediate frequency amplifier, 5,7...double tuning circuit, 6...
- Amplifier, 9... Fixed oscillator, L1 to L8... Coil, C□ to C8... Capacitor.

Claims

[Scope of utility model registration request]

a first mixer that mixes the input signal and the signal from the variable frequency oscillator to convert the frequency into a first intermediate frequency signal; the frequency of the variable frequency oscillator is higher than the first intermediate frequency signal; A fixed double-tuned circuit selects the first intermediate frequency signal as a P wave, and a second intermediate frequency is obtained by mixing the output signal of the double-tuned circuit with the signal from the fixed frequency oscillator. 1. A CATV converter, comprising: a mixer; and an absorption trap circuit electrically coupled to the double-tuned circuit.