JPS61283230A - Intermediate frequency amplifier - Google Patents
Intermediate frequency amplifierInfo
- Publication number
- JPS61283230A JPS61283230A JP60124322A JP12432285A JPS61283230A JP S61283230 A JPS61283230 A JP S61283230A JP 60124322 A JP60124322 A JP 60124322A JP 12432285 A JP12432285 A JP 12432285A JP S61283230 A JPS61283230 A JP S61283230A
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- intermediate frequency
- signal
- function
- diodes
- 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
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Transceivers (AREA)
- Superheterodyne Receivers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明はヘテロダイン送受信機に用いられる中間周波
増幅器に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an intermediate frequency amplifier used in a heterodyne transmitter/receiver.
第２図は従来の中間周波増幅器を示す回路図である。同
図において、１は信号入力端子、２および３は中間周波
増幅器、４および５はダイオード、６は信号出力端子で
ある。この種の中間周波増幅器はＦＭ信号を伝送する場
合にはリミッタ機能を有するものを使用し、ＰＣＭ信号
を伝送する場合には線形増幅器を使用するので、用途に
より別々の増幅器を使用する必要がある。FIG. 2 is a circuit diagram showing a conventional intermediate frequency amplifier. In the figure, 1 is a signal input terminal, 2 and 3 are intermediate frequency amplifiers, 4 and 5 are diodes, and 6 is a signal output terminal. This type of intermediate frequency amplifier has a limiter function when transmitting FM signals, and a linear amplifier is used when transmitting PCM signals, so it is necessary to use separate amplifiers depending on the purpose. .
上述し九従来の中間周波増幅器は、Ｆ’Ｍ信号伝送の場
合とＰＣＭ信号伝送の場合とでは異なった増幅器を使用
しなければならないという問題がある。The nine conventional intermediate frequency amplifiers described above have a problem in that different amplifiers must be used for F'M signal transmission and PCM signal transmission.
この発明に係る中間周波増幅器は、線形増幅器の機能と
振幅制限器の機能とを合せ持ち、伝送信号の種類によ〕
この２つの機能に使い分けできるものである。The intermediate frequency amplifier according to the present invention has both the function of a linear amplifier and the function of an amplitude limiter, and can be used depending on the type of transmission signal.
It can be used for these two functions.
この発明においては、同じ増幅器で線形増幅としての機
能と振幅制限としての機能を切替えることができる。In this invention, the same amplifier can be switched between a linear amplification function and an amplitude limiting function.
第１図はこの発明に係る中間周波増幅器の一実施例を示
す回路図である。同図において、７および８は制御信号
が入力する制御入力端子、９および１０はコンデンサ、
１１および１２はチ田−クコイルである。FIG. 1 is a circuit diagram showing an embodiment of an intermediate frequency amplifier according to the present invention. In the figure, 7 and 8 are control input terminals into which control signals are input, 9 and 10 are capacitors,
11 and 12 are chita-ku coils.
次に上記構成による中間周波増幅器の動作について説明
する。まず、制御入力端子Ｔおよび８に制御信号の入力
がないときＫは、信号入力端子１に入力する中間周波入
力信号はダイオード４および５により振幅制限を受ける
ため、振幅制限増幅器として機能することができる。ま
た、制御入力端子Ｔおよび８に制御信号が入力すると、
ダイオード４および５が逆バイアスとなる。このため、
このダイオード４および５のインピーダンスが高くなシ
、オープンに近い状態になるため、振幅制限の機能が失
なわれ、線形増幅器として機能することができる。Next, the operation of the intermediate frequency amplifier with the above configuration will be explained. First, when no control signal is input to the control input terminals T and 8, the intermediate frequency input signal input to the signal input terminal 1 is amplitude limited by the diodes 4 and 5, so that K cannot function as an amplitude limiting amplifier. can. Also, when a control signal is input to control input terminals T and 8,
Diodes 4 and 5 are reverse biased. For this reason,
When the impedance of the diodes 4 and 5 is high, the diodes 4 and 5 become nearly open, so that the amplitude limiting function is lost and the diodes 4 and 5 can function as a linear amplifier.
以上詳細に説明したように、この発明に係る中間周波増
幅器によれば簡単な構成により、ＦＭ信号伝送時の振幅
制限機能とＰＣＭ信号伝送時の線形増幅としての機能を
同一増幅器により実現することができる効果がある。As explained in detail above, according to the intermediate frequency amplifier according to the present invention, with a simple configuration, the amplitude limiting function during FM signal transmission and the linear amplification function during PCM signal transmission can be realized by the same amplifier. There is an effect that can be achieved.
第１図はこの発明に係る中間周波増幅器の一実施例を示
す回路図、第２図は従来の中間周波増幅器を示す回路図
である。
１・・・・信号入力端子、２および３・・・・中間周波
増幅器、４および５・・・・ダイオード、６・・・・信
号出力端子、７および８・・・・制御入力端子、９およ
び１０・・・−コンデンサ、１１および１２−−・・チ
ョークコイル。FIG. 1 is a circuit diagram showing an embodiment of an intermediate frequency amplifier according to the present invention, and FIG. 2 is a circuit diagram showing a conventional intermediate frequency amplifier. 1... Signal input terminal, 2 and 3... Intermediate frequency amplifier, 4 and 5... Diode, 6... Signal output terminal, 7 and 8... Control input terminal, 9 and 10...-capacitor, 11 and 12-- choke coil.
Claims (1)
いて、線形増幅器としての機能と振幅制限器としての機
能とを制御信号により切替え可能にしたことを特徴とす
る中間周波増幅器。An intermediate frequency amplifier used in a heterodyne transmitter/receiver, characterized in that the function as a linear amplifier and the function as an amplitude limiter can be switched by a control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60124322A JPS61283230A (en) | 1985-06-10 | 1985-06-10 | Intermediate frequency amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60124322A JPS61283230A (en) | 1985-06-10 | 1985-06-10 | Intermediate frequency amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61283230A true JPS61283230A (en) | 1986-12-13 |
Family
ID=14882464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60124322A Pending JPS61283230A (en) | 1985-06-10 | 1985-06-10 | Intermediate frequency amplifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61283230A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0241533U (en) * | 1988-09-13 | 1990-03-22 |
-
1985
- 1985-06-10 JP JP60124322A patent/JPS61283230A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0241533U (en) * | 1988-09-13 | 1990-03-22 | ||
| JP2522432Y2 (en) * | 1988-09-13 | 1997-01-16 | 株式会社東芝 | FM receiver |
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