JPS6052746U

JPS6052746U - 1 system diversity switching circuit

Info

Publication number: JPS6052746U
Application number: JP14346283U
Authority: JP
Inventors: 今川　敏幸; 猪又　英夫; 悟田崎
Original assignee: クラリオン株式会社
Priority date: 1983-09-16
Filing date: 1983-09-16
Publication date: 1985-04-13

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１系統ダイパーシテイの切換回路の基本的構成
を示すブロック図、第２図はＰＩＮダイオードを使用す
る従来の１系統ダイパーシテイの切換回路の一部回路図
一部ブロック図、第３図ａ、　ｂおよびＣは比較器のそ
れぞれ（−）端子、（＋）端子および出力端子における
信号波形図、第４図は本考案による１系統ダイパーシテ
イの切換回路の一部回路図一部ブロック図である。１・・・高周波増幅段、２・・・中間周波増幅段、３・
・・検波回路、４・・・低周波増幅回路、５・・・信号
検出回路、６・・・制御回路、７・・・ＦＭラジオ本体
部、８・・・信号強度・マルチパスレベル検出器、９・
・・比較器、１０・・・発振器、１１・・・フリップフ
ロップ回路、Ｄ、、　Ｄ２−Ｐ　Ｉ　Ｎダイオード、Ｔ
　ｒ　ｉ、Ｔ　ｒ　２・・・駆動トランジスタ、Ｌ□、
　Ｌ２．　Ｌ３・・・高周波阻止用チョーク・コイル、
Ｑ、Ｑ・・・フリップフロップ回路の出力、ＳＰ・・・
スピーカ、ＡＮＴＡ、ＡＮＴＢ・・・アンテナ、Ｒ１へ
Ｒ７・・・抵抗、Ｃ・・・コンデンサ、ＳＷ・・・アン
テナ切換スイッチ。Fig. 1 is a block diagram showing the basic configuration of a single-system dipersity switching circuit, Fig. 2 is a partial circuit diagram and partial block diagram of a conventional single-system dipersity switching circuit using PIN diodes, and Fig. Figures a, b, and C are signal waveform diagrams at the (-) terminal, (+) terminal, and output terminal of the comparator, respectively, and Figure 4 is a partial circuit diagram and partial block of the single-system diversity switching circuit according to the present invention. It is a diagram. 1...High frequency amplification stage, 2...Intermediate frequency amplification stage, 3.
...Detection circuit, 4...Low frequency amplification circuit, 5...Signal detection circuit, 6...Control circuit, 7...FM radio body, 8...Signal strength/multipath level detector , 9・
... Comparator, 10... Oscillator, 11... Flip-flop circuit, D, D2-PIN diode, T
r i, T r 2...drive transistor, L□,
L2. L3...High frequency blocking choke coil,
Q, Q...Flip-flop circuit output, SP...
Speaker, ANTA, ANTB...Antenna, R1 to R7...Resistor, C...Capacitor, SW...Antenna selection switch.

Claims

[Scope of utility model registration request]

In a single-system diversity system consisting of two antennas, an FM radio main body, a signal strength/multipath level detection circuit, a comparator, an oscillator, and a flip-flop circuit, one output of the flip-flop circuit is connected via a resistor and a transistor. It is connected to the input side of the PIN diode in one antenna part, and the output of the other is connected to the input side of the PIN diode in the other antenna part via a resistor,
A single-system diversity switching circuit characterized in that the outputs of the two PIN diodes are connected to each other and grounded via a resistor.