JPS5830356U

JPS5830356U - radio receiver

Info

Publication number: JPS5830356U
Application number: JP12424181U
Authority: JP
Inventors: 哲西尾; 誠一郎平田
Original assignee: 三菱電機株式会社
Priority date: 1981-08-21
Filing date: 1981-08-21
Publication date: 1983-02-28

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図は従来のラジオ受信機のブロック構成図、第２図
は本考案の一実施例を示すブロック構成図、第３図は本
考案の一実施例によるラジオ受信機の電圧合成器と高周
波増幅器の同調部及びそのその周辺回路を示す回路図、
第４図は本考案の一実施例によるラジオ受信機の同調補
正動作を示す波形図である。４０・・・位相同期ループ、２９′・・・電圧合成器、
３０・・・発振器、ｓｗｌ・・・スイッチ、２１・・・
検波回路、４２・・・マイクロコンピュータ（制御回路
）。なお図中同一符号は同−又は相当部分を示す。Fig. 1 is a block diagram of a conventional radio receiver, Fig. 2 is a block diagram of an embodiment of the present invention, and Fig. 3 is a voltage synthesizer and high frequency diagram of a radio receiver according to an embodiment of the present invention. A circuit diagram showing the tuning section of the amplifier and its peripheral circuits,
FIG. 4 is a waveform diagram showing a tuning correction operation of a radio receiver according to an embodiment of the present invention. 40... Phase locked loop, 29'... Voltage synthesizer,
30...Oscillator, swl...Switch, 21...
Detection circuit, 42... microcomputer (control circuit). Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims

[Scope of utility model registration request]

A phase-locked loop frequency synthesizer one-type radio receiver that uses variable capacitance diodes in the high frequency amplifier's tuning circuit and the local oscillator's oscillation circuit includes a voltage controlled oscillation circuit that constitutes the local oscillator, and its local oscillation output. a phase-locked loop that adds a mixer; a voltage synthesizer that combines the voltage applied to the voltage controlled oscillation circuit with a correction voltage from a control circuit (described later) and provides a combined voltage to the variable capacitance diode of the high frequency amplifier; an oscillator that generates a signal with the same frequency as the received frequency after the phase-in-phase locked loop is locked; a switch that switches the output of this oscillator to the received signal from the antenna and inputs it to the high frequency amplifier; and the output of the oscillator. A high frequency amplifier, a mixer, an intermediate frequency amplifier, a detection circuit that detects the amplitude value of a signal that has passed through a bandpass filter centered on the intermediate frequency, and a correction applied to the output amplitude value of this detection circuit and the voltage synthesizer above. a control circuit that compares the amplitude value when the voltage is changed, changes the correction voltage to be applied to the voltage synthesizer according to the comparison result, and holds the correction voltage fixed when the maximum amplitude value is obtained; A radio receiver characterized by comprising: