JPS58201432A - Radio receiver - Google Patents

Radio receiver

Info

Publication number
JPS58201432A
JPS58201432A JP8585782A JP8585782A JPS58201432A JP S58201432 A JPS58201432 A JP S58201432A JP 8585782 A JP8585782 A JP 8585782A JP 8585782 A JP8585782 A JP 8585782A JP S58201432 A JPS58201432 A JP S58201432A
Authority
JP
Japan
Prior art keywords
circuit
antenna
frequency
radio receiver
local oscillating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP8585782A
Other languages
Japanese (ja)
Inventor
Katsuhiko Miyanaga
宮永　克彦
Masahiro Matsubara
松原　正廣
Junichi Kubota
順一 久保田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP8585782A priority Critical patent/JPS58201432A/en
Publication of JPS58201432A publication Critical patent/JPS58201432A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference
    • H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
    • H04B15/04—Reducing interference from electric apparatus by means located at or near the interfering apparatus the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder
    • H04B15/06—Reducing interference from electric apparatus by means located at or near the interfering apparatus the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder by local oscillators of receivers

Abstract

PURPOSE:To prevent spurious radiation of a radio receiver with simple constitution, by inserting a prallel resonance circuit to an antenna circuit. CONSTITUTION:A broadcast signal incoming from an antenna 1 is applied to an antenna input circuit 2 via the parallel resonance circuit 6 and further inputted to a high-frequency amplifier circuit 3. A frequency mixing circuit 4 mixes an output of the high-frequency amplifier circuit 3 and an output of a local oscillating circuit 5, generates an intermediate frequency signal of a prescribed frequency and outputs the signal to an intermediate frequency amplifier (not shown) at a post-stage. The parallel resonance circuit 6 connected to the antenna circuit consists of an inductance L3, a varactor diode D1, and a capacitor C1, is controlled simultaneously with the local oscillating circuit 5 and controlled to a resonance frequency coincident with the local oscillating frequency. Then, the resonance circuit 6 prevents a signal of the local oscillating circuit 5 from being irradiated spuriously from the antenna 1 via the amplifier 3 and the antenna circuit 2.

Description

【発明の詳細な説明】 本発明はヌーパヘテロタイン方式のラジオ受信機に係り
、簡単な構成で不要輻射の少ない優れたラジオ受信機を
提供することを目的とするものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a Nupa heterotine radio receiver, and an object of the present invention is to provide an excellent radio receiver with a simple configuration and less unnecessary radiation.

一般ニヌーパヘテロタイン方式のラジオ受信機では局部
発振回路を備えており、その出力がアンテナを介して不
要に輻射されることが多い。そのため、従来よりこの種
の不要輻射を防止するため色々な対策がなされているが
、これらのものはいずれも、その構成が非常に複雑であ
り、しかも余り効果の大きいものではなかった。A general NINUPA heterotine radio receiver is equipped with a local oscillation circuit, and its output is often unnecessarily radiated via the antenna. Therefore, various measures have been taken to prevent this type of unnecessary radiation, but all of these measures have very complicated structures and are not very effective.

本発明は以上のような従来の欠点を除去するものであり
、簡単な構成でアンテナから放射される不要輻射をは＼
完全に阻止するように構成したものである。The present invention eliminates the above-mentioned conventional drawbacks, and eliminates unnecessary radiation emitted from the antenna with a simple configuration.
It is designed to completely prevent this.

以下、本発明のラジオ受信機について一実施例の図面と
ともに説明する。図は本発明のラジオ受信機における一
実施例の概略電気的結線図であり、図中、１はアンテナ
、２はコイ／ｌ／Ｌｌ、　　Ｌ２、コンデンサ０１，０
２より成るアンテナ入力回路、３は高周波増幅回路、４
は周波数混合回路、６は局部発振回路である。そして、
６はアンテナ１とアンテナ入力回路２との間に接続され
たコイルＬ５　　コンデンサ０５　　可変容量ダイオー
ドＤ１　　より成る並列Ｊｉ：振回路であり、可変容量
タイオードＤ１　　には抵抗Ｒ１を介して局部発振回路
５の発振周波数を決定する可変容量タイオードＤ２に印
加される直流電圧が印加されている。すなわち、局部発
振回路５は発振周波数がコイルＬ４、可変容量ダイオー
ドＤ２によって決定されるように構成されており、ここ
に抵抗Ｒ２を介して印加される直流電圧が同時に抵抵Ｒ
１を介して並列共振回路６を構成する可変容量タイオー
ドＤ１に印加されるように構成されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS The radio receiver of the present invention will be described below with reference to the drawings of one embodiment. The figure is a schematic electrical connection diagram of one embodiment of the radio receiver of the present invention, and in the figure, 1 is an antenna, 2 is a coil/l/Ll, L2, and a capacitor 01,0.
2 is an antenna input circuit, 3 is a high frequency amplification circuit, and 4 is an antenna input circuit.
is a frequency mixing circuit, and 6 is a local oscillation circuit. and,
Reference numeral 6 denotes a parallel Ji:oscillation circuit consisting of a coil L5, a capacitor 05, and a variable capacitance diode D1 connected between the antenna 1 and the antenna input circuit 2. The variable capacitance diode D1 is connected to the local oscillation circuit 5 via a resistor R1. A DC voltage is applied to the variable capacitance diode D2 which determines the oscillation frequency. That is, the local oscillation circuit 5 is configured such that the oscillation frequency is determined by the coil L4 and the variable capacitance diode D2, and the DC voltage applied thereto via the resistor R2 is simultaneously applied to the resistor R.
1 to the variable capacitance diode D1 constituting the parallel resonant circuit 6.

」−記実施例においてアンテナ１で受信された信号は並
列共振回路６、アンテナ入力回路２を介して高周波増幅
回路３に印加され、ここで増幅された後周波数混合回路
４に印加される。周波数混合回路４には同時に局部発振
回路６の出力が印加されるため、その出力端には中間周
波信号が出力される。In the embodiment described above, the signal received by the antenna 1 is applied to the high frequency amplifier circuit 3 via the parallel resonant circuit 6 and the antenna input circuit 2, where it is amplified and then applied to the frequency mixing circuit 4. Since the output of the local oscillation circuit 6 is simultaneously applied to the frequency mixing circuit 4, an intermediate frequency signal is outputted to its output terminal.

ところで、この場合、局部発振回路６の出力はその一部
が増幅回路３、アンテナ入力回路２を介して逆にアンテ
ラ側に伝達されることがある。ところが上記実施例によ
れば並列共振回路６が挿入されているため、ここでアン
テナ１に至る局部発振回路６の出力が阻止されることに
なり、アンテナ１からの不要輻射が極端に小さくなる。By the way, in this case, a part of the output of the local oscillation circuit 6 may be transmitted to the antenna side via the amplifier circuit 3 and the antenna input circuit 2. However, according to the above embodiment, since the parallel resonant circuit 6 is inserted, the output of the local oscillation circuit 6 reaching the antenna 1 is blocked here, and unnecessary radiation from the antenna 1 is extremely reduced.

特に上記実施例によれば並列共振回路の共振周波数が局
部発振回路の発振周波数に追従して常に同一になるよう
に構成されているため局部発振回路の発振出力に対して
は最大のインピーダンスを呈することになり、アンテナ
からの不要輻射をはソ完全に阻止することができる。そ
して、この状態は受信周波数を変化させ局部発振回路の
発振周波数を如何に変化させた場合でも維持しており、
したがって実用上きわめて有利である。In particular, according to the above embodiment, the resonant frequency of the parallel resonant circuit follows the oscillation frequency of the local oscillation circuit and is always the same, so it presents the maximum impedance to the oscillation output of the local oscillation circuit. Therefore, unnecessary radiation from the antenna can be completely blocked. This state is maintained no matter how the receiving frequency is changed and the oscillation frequency of the local oscillation circuit is changed.
Therefore, it is extremely advantageous in practice.

以上、実施例より明らかなように本発明のラジオ受信機
によれば簡単な構成でアンテナからの不要輻射をは＼゛
完全阻止することができ、実用上きわめて有利なもので
ある。As is clear from the above embodiments, the radio receiver of the present invention can completely block unnecessary radiation from the antenna with a simple configuration, and is extremely advantageous in practice.

尚、実施例では通常のラジオ受信機について説明したが
ＰＬＬを使用したシンセサイザ一方式のラジオ受信機に
も同様に利用することができる。In the embodiment, a normal radio receiver has been described, but the present invention can be similarly applied to a synthesizer-type radio receiver using a PLL.

【図面の簡単な説明】[Brief explanation of the drawing]

図は本発明のラジオ受信機における一実施例の概略電気
的結線図である。 １・・・・・アンテナ、２・・・・・・アンテナ入力回
路、３・・・・・高周波増幅回路、４・・・・・・周波
数混合回路、６・・・・局部発振回路、Ｌ１〜Ｌ４・・
・・・コイル、０１〜Ｃ４・・・・・コンデンサ、Ｉｈ
　、　Ｄ２・・・・・可変容ｊ％ｌダイオード、Ｒ＋　
、　Ｒ２・・・・抵抗。The figure is a schematic electrical connection diagram of an embodiment of the radio receiver of the present invention. 1...Antenna, 2...Antenna input circuit, 3...High frequency amplification circuit, 4...Frequency mixing circuit, 6...Local oscillation circuit, L1 ~L4...
... Coil, 01-C4 ... Capacitor, Ih
, D2...Variable capacitance j%l diode, R+
, R2...Resistance.

Claims (1)

【特許請求の範囲】[Claims] アンテナ入力回路に直列に可変容量タイオードとコイル
で構成される並列共振回路を接続し、この並列共振回路
を構成する上記可変容量タイオードに上記並列共振回路
の共振周波数が局部発振回路の発振周波数に一致するよ
うなハイアヌを与えるように構成しだラジオ受信機。A parallel resonant circuit consisting of a variable capacitance diode and a coil is connected in series to the antenna input circuit, and the resonant frequency of the parallel resonant circuit matches the oscillation frequency of the local oscillation circuit in the variable capacitance diode that constitutes this parallel resonant circuit. Configure your radio receiver to give you a similar experience.
JP8585782A 1982-05-20 1982-05-20 Radio receiver Pending JPS58201432A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8585782A JPS58201432A (en) 1982-05-20 1982-05-20 Radio receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8585782A JPS58201432A (en) 1982-05-20 1982-05-20 Radio receiver

Publications (1)

Publication Number Publication Date
JPS58201432A true JPS58201432A (en) 1983-11-24

Family

ID=13870541

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8585782A Pending JPS58201432A (en) 1982-05-20 1982-05-20 Radio receiver

Country Status (1)

Country Link
JP (1) JPS58201432A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0748059A2 (en) * 1995-06-07 1996-12-11 Deutsche Thomson-Brandt Gmbh RF input circuit
CN107994316A (en) * 2017-10-30 2018-05-04 深圳依偎控股有限公司 Antenna system and communication terminal

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0748059A2 (en) * 1995-06-07 1996-12-11 Deutsche Thomson-Brandt Gmbh RF input circuit
EP0748059A3 (en) * 1995-06-07 2001-04-11 Deutsche Thomson-Brandt Gmbh RF input circuit
CN107994316A (en) * 2017-10-30 2018-05-04 深圳依偎控股有限公司 Antenna system and communication terminal
CN107994316B (en) * 2017-10-30 2020-06-23 深圳依偎控股有限公司 Antenna system and communication terminal

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