JPS6022051U

JPS6022051U - Prescaler circuit

Info

Publication number: JPS6022051U
Application number: JP11351383U
Authority: JP
Inventors: 川口　敬俊
Original assignee: 関西日本電気株式会社
Priority date: 1983-07-20
Filing date: 1983-07-20
Publication date: 1985-02-15

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 the drawing]

第１図は従来のプリスケーラの回路図、第２図は本考案
のプリスケーラ回路図、第３図はＣＡＴ■コンバータで
用いる信号スペクトル図、第４図は本考案に係るＣＡＴ
Ｖコンバータのブロック図、及び第５図は第４図のＣＡ
ＴＶコンバータの回路図である。１・・・局部発振回路、３・・・入力端子、４，６４・
・・プリスケーラＩＣ，１０，８０・・・トラップ回路
、１１．８１・・・コイル、１２．８２・・・コンデン
サ。／２−１士Ｂ　　　　ｎ＋ｒｒ？ン、　　へ、− ＡＴＴ　ＳＡＭ　　　　　−Fig. 1 is a circuit diagram of a conventional prescaler, Fig. 2 is a prescaler circuit diagram of the present invention, Fig. 3 is a signal spectrum diagram used in a CAT ■ converter, and Fig. 4 is a CAT according to the present invention.
The block diagram of the V converter, and Figure 5 is the CA of Figure 4.
It is a circuit diagram of a TV converter. 1... Local oscillation circuit, 3... Input terminal, 4, 64.
...Prescaler IC, 10,80...Trap circuit, 11.81...Coil, 12.82...Capacitor. /2-1 B n+rr? - ATT SAM -

Claims

[Scope of utility model registration request]

(1) A prescaler device having an input terminal for extracting a local signal of a local oscillation stage for PLL synthesizer tuning, characterized in that a trap circuit for a signal related to a quarter frequency of the local signal is inserted into the input terminal. A prescaler circuit.

(2) the local oscillation stage is a local oscillation circuit for an up-converter of an up-down CATV converter, and the trap circuit is set to a trap frequency that eliminates beats in the IF signal frequency range that occur when receiving a specific channel of a CATV signal; The prescaler circuit according to claim 1, which prevents reception interference caused by a 1/4 frequency signal component of a local signal in a specific channel.