JPS58109354U - Variable band intermediate frequency amplifier circuit - Google Patents
Variable band intermediate frequency amplifier circuitInfo
- Publication number
- JPS58109354U JPS58109354U JP654882U JP654882U JPS58109354U JP S58109354 U JPS58109354 U JP S58109354U JP 654882 U JP654882 U JP 654882U JP 654882 U JP654882 U JP 654882U JP S58109354 U JPS58109354 U JP S58109354U
- Authority
- JP
- Japan
- Prior art keywords
- intermediate frequency
- circuit
- amplification circuit
- impedance element
- variable
- 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
Links
Landscapes
- Superheterodyne Receivers (AREA)
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) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
、第１図は本考案の可変帯域中筒周波増幅回路のブロッ
ク図、第２図は同回路の要部の具体的回路図である。
１・・・・・・アンテナ、２・・・・・・高周波増幅回
路、３・・・・・・周波数変換回路、４・・・・・・局
部発振回路、５・・・・・パ中間周波増幅回路、６・・
・・・・検波回路、９・・・・・・平均値保持回路、Ｑ
２・・・・・・制御トランジスタ、Ｄ・・・・・・フォ
ト・ダイオード、Ｔｒ・・・・・・フォト・トランジス
タ、Ｔ・・・・・・結合トランス。, FIG. 1 is a block diagram of the variable band medium frequency amplification circuit of the present invention, and FIG. 2 is a specific circuit diagram of the main parts of the circuit. 1... Antenna, 2... High frequency amplification circuit, 3... Frequency conversion circuit, 4... Local oscillation circuit, 5... Pa intermediate Frequency amplification circuit, 6...
...Detection circuit, 9...Average value holding circuit, Q
2... Control transistor, D... Photo diode, Tr... Photo transistor, T... Coupling transformer.
Claims (2)
する周波数変換回路と、該回路の出力中間周波を増幅す
る中間周波増幅回路と、該中間周波増幅回路の出力の振
幅を包路線検波する包路線検波回路とを備える振幅変調
受信機において、前記中間周波増幅回路の結合ト５ンス
と並列に可変インピーダンス素子を接続し、該インピー
ダンス素子を前記包路線検波回路の出力で制御し、入力
信号が強い時には前記可変インピーダンス素子のインピ
ーダンスを小さくして前記中間周波増幅回路の帯域を広
げると共に入力信号が弱い時には前記可変インピーダン
ス素子のインピーダンスを大きくして前記中間周波数増
幅回路の帯域を狭くすることを特徴とする可変帯域中間
周波増幅回路。(1) A frequency conversion circuit that converts an antenna input high frequency signal into an intermediate frequency signal, an intermediate frequency amplification circuit that amplifies the output intermediate frequency of the circuit, and an envelope line that performs envelope detection of the amplitude of the output of the intermediate frequency amplification circuit. In the amplitude modulation receiver comprising a detection circuit, a variable impedance element is connected in parallel with the coupling transformer of the intermediate frequency amplification circuit, and the impedance element is controlled by the output of the envelope line detection circuit, so that the input signal is strong. Sometimes, the impedance of the variable impedance element is reduced to widen the band of the intermediate frequency amplification circuit, and when the input signal is weak, the impedance of the variable impedance element is increased to narrow the band of the intermediate frequency amplification circuit. Variable band intermediate frequency amplification circuit.
タであり、包路線検波回路の出力をフォトダイオードに
より光エネルギーに変換して前記フォトトランジスタを
制御する可変帯域中間周波増幅回路。(2) A variable band intermediate frequency amplifier circuit in which the variable impedance element is a phototransistor, and the output of the envelope detection circuit is converted into optical energy by a photodiode to control the phototransistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP654882U JPS58109354U (en) | 1982-01-20 | 1982-01-20 | Variable band intermediate frequency amplifier circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP654882U JPS58109354U (en) | 1982-01-20 | 1982-01-20 | Variable band intermediate frequency amplifier circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58109354U true JPS58109354U (en) | 1983-07-26 |
Family
ID=30019336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP654882U Pending JPS58109354U (en) | 1982-01-20 | 1982-01-20 | Variable band intermediate frequency amplifier circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58109354U (en) |
-
1982
- 1982-01-20 JP JP654882U patent/JPS58109354U/en active Pending
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