JPS61206335U - - Google Patents
Info
- Publication number
- JPS61206335U JPS61206335U JP9072085U JP9072085U JPS61206335U JP S61206335 U JPS61206335 U JP S61206335U JP 9072085 U JP9072085 U JP 9072085U JP 9072085 U JP9072085 U JP 9072085U JP S61206335 U JPS61206335 U JP S61206335U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- capacitor
- microcapacitance
- variable capacitance
- capacitance diode
- 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.)
- Granted
Links
- 239000003990 capacitor Substances 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 3
- 230000003321 amplification Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000010363 phase shift Effects 0.000 description 1
Landscapes
- Superheterodyne Receivers (AREA)
- Noise Elimination (AREA)
- Circuits Of Receivers In General (AREA)
Description
第１図は本考案の主要部分の一実施例を示す回
路図、第２図は本考案の主要部分の別の実施例を
示す回路図、第３図は中間周波信号の帯域幅が切
換え可能に成されたＦＭ受信機を示すブロツク図
、第４図は従来のクオードラチヤ検波回路を示す
回路図、第５図イ及びロはその説明に供する為の
特性図である。
主な図番の説明、３，４…中間周波増幅回路、
５…帯域幅選択回路、６，７…切換回路、１３…
移相回路、２０…同調回路、２４…直列回路、２
５…微少容量コンデンサ、２６…可変容量ダイオ
ード、２７…トランジスタ、２８…可変抵抗器。
Fig. 1 is a circuit diagram showing one embodiment of the main part of the present invention, Fig. 2 is a circuit diagram showing another embodiment of the main part of the invention, and Fig. 3 shows that the bandwidth of the intermediate frequency signal can be switched. FIG. 4 is a circuit diagram showing a conventional quadrature detection circuit, and FIGS. 5A and 5B are characteristic diagrams for explaining the same. Explanation of main drawing numbers, 3, 4...Intermediate frequency amplification circuit,
5...Bandwidth selection circuit, 6,7...Switching circuit, 13 ...
Phase shift circuit, 20 ... Tuning circuit, 24 ... Series circuit, 2
5... Microcapacitance capacitor, 26... Variable capacitance diode, 27... Transistor, 28... Variable resistor.
Claims (1)
ることが出来る中間周波増幅回路と、同調回路を
有し、該同調回路の共振周波数を調整することに
より検波出力の歪の調整が行われる検波回路とを
備えるＦＭ受信機において、前記同調回路に有す
るコンデンサに比べ容量が微少な微少容量コンデ
ンサ及び該微少容量コンデンサと直列に接続され
る可変容量ダイオードから構成されると共に前記
同調回路のコンデンサと並列に接続される直列回
路と、該直列回路の微少容量コンデンサ及び可変
容量ダイオードの接続点に接続され、中間周波信
号の帯域幅の切換えに応じてスイツチングするス
イツチング素子と、該スイツチング素子のオン状
態とオフ状態とで前記可変容量ダイオードに異な
る逆バイアス電圧を印加する電圧印加手段とを設
け、選択された帯域幅に応じて前記スイツチング
素子をオン・オフさせて前記可変容量ダイオード
の容量を変化せしめ、前記同調回路の共振周波数
を選択された帯域幅ごとに調整出来る様にしたこ
とを特徴とするＦＭ受信機。 An intermediate frequency amplification circuit that can switch the bandwidth of an intermediate frequency signal within the same band; and a detection circuit that has a tuning circuit and adjusts the distortion of the detection output by adjusting the resonance frequency of the tuning circuit. An FM receiver comprising: a microcapacitance capacitor having a microcapacitance smaller than that of the capacitor included in the tuning circuit; and a variable capacitance diode connected in series with the microcapacitance capacitor, and connected in parallel with the capacitor of the tuning circuit. a switching element that is connected to a connection point between a microcapacitance capacitor and a variable capacitance diode in the series circuit and switches in response to switching of the bandwidth of an intermediate frequency signal; and an on state and an off state of the switching element. and a voltage applying means for applying different reverse bias voltages to the variable capacitance diode, the switching element is turned on and off according to the selected bandwidth to change the capacitance of the variable capacitance diode, and the tuning An FM receiver characterized in that the resonant frequency of the circuit can be adjusted for each selected bandwidth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9072085U JPH039399Y2 (en) | 1985-06-14 | 1985-06-14 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9072085U JPH039399Y2 (en) | 1985-06-14 | 1985-06-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61206335U true JPS61206335U (en) | 1986-12-26 |
| JPH039399Y2 JPH039399Y2 (en) | 1991-03-08 |
Family
ID=30645963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9072085U Expired JPH039399Y2 (en) | 1985-06-14 | 1985-06-14 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH039399Y2 (en) |
-
1985
- 1985-06-14 JP JP9072085U patent/JPH039399Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH039399Y2 (en) | 1991-03-08 |
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