JPS6079849U

JPS6079849U - CATV tuner

Info

Publication number: JPS6079849U
Application number: JP17249883U
Authority: JP
Inventors: 高尾　武和; 義治寺田
Original assignee: 関西日本電気株式会社
Priority date: 1983-11-07
Filing date: 1983-11-07
Publication date: 1985-06-03

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ＣＡＴＶチューナの概略構成を、本考案による
改良点を点線で示したブロック図、第２図は可変容量ダ
イオードの逆バイアス電圧一端子間容量の特性を、本考
案によって変更使用される特性部分を点線で示した図で
ある。２Ｕ・・−ＵＨＦバンド受信部、２Ｖ・・・ＶＨＦバン
ド受信部、２ＶＨ・・・ＶＨＦハイパバンド受信部、３
・・・混合回路、５・・・段間同調回路、５Ｄ１，５Ｄ
２・・・可変容量ダイオード、８・・−ＣＡＴＶチュー
ナ、９゜１０・・・ダイオード、ＢＵ・・・ＵＨＦバン
ド受信部の動作電圧、ＢＶ・・・ＶＨＦバンド受信部の
動作電圧、ＢＶＨ・・・ＶＨＦハイパバンド受信部の動
作電圧、ＢＣ・・・共通動作電圧、ＢＴＵ・・・同調電
圧。Figure 1 is a block diagram showing the general configuration of a CATV tuner, with improvements made by the present invention indicated by dotted lines. Figure 2 shows the characteristics of the capacitance between the reverse bias voltage and the terminal of a variable capacitance diode, which is modified and used according to the present invention. FIG. 3 is a diagram showing characteristic parts with dotted lines. 2U...-UHF band receiving section, 2V...VHF band receiving section, 2VH...VHF hyperband receiving section, 3
...Mixing circuit, 5...Inter-stage tuning circuit, 5D1, 5D
2...Variable capacitance diode, 8...-CATV tuner, 9゜10...Diode, BU...Operating voltage of UHF band receiving section, BV...Operating voltage of VHF band receiving section, BVH...・VHF hyperband receiver operating voltage, BC...common operating voltage, BTU...tuning voltage.

Claims

[Scope of utility model registration request]

The first, second and third pad receivers are selectively supplied with an operating voltage, and a common tuning voltage is supplied to the tuning variable capacitance diodes of each receiver, and the first and second band receivers are provided with a common tuning voltage. In a CATV tuner in which the positive output signal is amplified by the mixing circuit of the third band receiving section, the mixing circuit of the third band receiving section is supplied with an operating voltage during reception of each band, and the mixing circuit of the third band receiving section is supplied with an operating voltage, and the mixing circuit of the third band receiving section is supplied with an operating voltage. A CATV tuner characterized in that a diode is inserted between a tuning variable capacitance diode and a terminal for selectively supplying an operating voltage to the first and second band receiving sections.