JPH0542843B2 - - Google Patents
Info
- Publication number
- JPH0542843B2 JPH0542843B2 JP60257566A JP25756685A JPH0542843B2 JP H0542843 B2 JPH0542843 B2 JP H0542843B2 JP 60257566 A JP60257566 A JP 60257566A JP 25756685 A JP25756685 A JP 25756685A JP H0542843 B2 JPH0542843 B2 JP H0542843B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- amplifier
- band
- limited
- output
- 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.)
- Expired - Lifetime
Links
Landscapes
- Amplifiers (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、FM信号用増幅装置に関し、特に増
幅装置出力の飽和出力まで使用する増幅装置に関
する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an FM signal amplification device, and more particularly to an amplification device that is used up to the saturated output of the amplification device output.
［従来の技術］
従来、FM信号用増幅器は、出力レベルをで
きるだけ大きくするため、温度変動や、入力信
号レベル変動に対して出力レベルを安定させる等
のため飽和増幅器を用いてきた。[Prior Art] Conventionally, FM signal amplifiers have used saturation amplifiers in order to increase the output level as much as possible and to stabilize the output level against temperature fluctuations and input signal level fluctuations.
振幅成分を保持する増幅器としては、直線増幅
器があるが、バツクオフを大きくとる必要がある
ため、10倍程度の飽和出力が必要で大出力のもの
が必要となる、大型かつ効率が低い、消費電力が
大きい等の問題がある。 There is a linear amplifier as an amplifier that maintains the amplitude component, but since it is necessary to have a large back-off, a saturation output of about 10 times is required, which requires a large output, large size, low efficiency, and power consumption. There are problems such as large numbers.
［解決すべき問題点］
前述した従来の飽和増幅器は、単純なFM変調
信号波すなわち振幅信号のない信号波に対して
は、何ら問題なく動作する。しかしながら、FM
変調波に狭帯域帯域制限をかけた信号波、例え
ば、J0，J1（Joはベツセル函数を示す）しか残ら
ずJ2，J3〜Joの如く高次のベツセル函数成分をす
べて除去されたFM信号波の如き信号は元々FM
信号波のため、振幅成分をもつていないのである
が、帯域制限を受ける事により、切り捨てられた
高次のベツセル函数に相当する振幅成分を持つよ
うになる。この振幅成分を持つ信号を飽和増幅器
に加えると、飽和増幅器出力では、前述の帯域制
限による振幅成分が増幅器の特性により失われ
て、帯域制限を受ける前のスペクトルに戻つてし
まう。いわゆるFM変調波のリカバリー現象が起
る。この現象はFM信号（特に狭帯域帯域制限
FM信号）を復調するのには具合が良いが、送信
側では自局の帯域以外に不要波を発生し、不都合
を生じる。また、これを逃れるため直線増幅器を
使うと、大型低効率、大消費電力の欠点がある。[Problems to be Solved] The conventional saturation amplifier described above operates without any problem for a simple FM modulated signal wave, that is, a signal wave without an amplitude signal. However, F.M.
For example, only J 0 and J 1 (J o indicates the Betzel function) remain, and all higher-order Betzel function components such as J 2 , J 3 to Jo are left behind. Signals like the removed FM signal wave are originally FM
Since it is a signal wave, it does not have an amplitude component, but by being band-limited, it has an amplitude component corresponding to a truncated higher-order Betzel function. When a signal having this amplitude component is applied to a saturated amplifier, the amplitude component due to the above-mentioned band limitation is lost in the output of the saturated amplifier due to the characteristics of the amplifier, and the spectrum returns to the one before the band limitation. A so-called FM modulated wave recovery phenomenon occurs. This phenomenon is caused by FM signals (particularly narrow band-limited
Although it is suitable for demodulating FM signals, it generates unnecessary waves outside the own station's band, causing problems on the transmitting side. Furthermore, if a linear amplifier is used to avoid this problem, it has the drawbacks of large size, low efficiency, and large power consumption.
［問題点の解決手段］
上記従来の問題点を解決する本発明の狭帯域帯
域制限FM信号用増幅装置は、振幅制限された
FM信号が狭帯域帯域制限ろ波器により狭帯域帯
域制限を受けた振幅制限・帯域制限FM信号を増
幅する非直線増幅動作FM信号用増幅器におい
て、前記振幅制限・帯域制限FM信号の狭帯域帯
域制限による再発生AM信号成分を検出する検波
器と、該検波器の出力電圧を増幅する第一の増幅
器と、該増幅器出力信号により、FM信号用増幅
器のトランジスタのコレクタ又はドレイン電圧を
微小変化させる出力インピーダンスの低い第２の
増幅器を具備する構成である。[Means for Solving Problems] The narrowband band-limited FM signal amplification device of the present invention solves the above conventional problems.
In an FM signal amplifier with non-linear amplification operation that amplifies an amplitude-limited/band-limited FM signal whose FM signal has been narrow-band limited by a narrow-band band-limited filter, the narrow-band band of the amplitude-limited/band-limited FM signal is A detector for detecting re-occurring AM signal components due to the restriction, a first amplifier for amplifying the output voltage of the detector, and a collector or drain voltage of a transistor of the FM signal amplifier being slightly changed by the output signal of the amplifier. This configuration includes a second amplifier with low output impedance.
［実施例］
以下、本発明につき好適な一実施例を示す図面
を参照して詳細に説明する。[Embodiment] Hereinafter, the present invention will be described in detail with reference to the drawings showing a preferred embodiment.
第１図は、本発明のブロツクダイヤグラムを示
し、信号入力は検波器１とFM信号用増幅器４に
加えられる。入力信号の狭帯域帯域制限による振
幅成分は、検波器１で検波され、増幅器２で電圧
増幅される。この信号は電流増幅器３でさらに増
幅され、FM信号用増幅器４の電源電圧に重畳さ
れる。 FIG. 1 shows a block diagram of the invention, in which signal inputs are applied to a detector 1 and an amplifier 4 for the FM signal. The amplitude component of the input signal due to the narrow band limitation is detected by a detector 1 and voltage amplified by an amplifier 2. This signal is further amplified by the current amplifier 3 and superimposed on the power supply voltage of the FM signal amplifier 4.
第２図は、800MHz帯FM信号用増幅器の電源
電圧をパラメタとしたカーブである。これによ
り、電源電圧を変化すれば、信号に振幅変調をか
けられる事がわかる。 Figure 2 is a curve with the power supply voltage of the 800MHz band FM signal amplifier as a parameter. This shows that amplitude modulation can be applied to the signal by changing the power supply voltage.
第１図のように構成することにより、狭帯域帯
域制限による振幅成分が、FM信号用増幅器４の
飽和特性により、一時失われるが、電源電圧に加
えられた、失われた振幅成分に対応する、振幅信
号により、再生され、FM信号用増幅器４の出力
は、狭帯域帯域制限を受けた信号と同一とでき
る。 By configuring as shown in Fig. 1, the amplitude component due to narrow band limitation is temporarily lost due to the saturation characteristics of the FM signal amplifier 4, but the lost amplitude component added to the power supply voltage can be compensated for. , the output of the FM signal amplifier 4 can be the same as the narrow band limited signal.
上記説明を、800MHz帯MF変調信号によるテ
レビジヨン伝送に適用した場合の具体的数値を用
いて、補足説明する。 The above explanation will be supplemented by using specific numerical values when applied to television transmission using an 800 MHz band MF modulated signal.
FM変調波は、NTSC標準カラーバー信号を用
いて変調した。変調器入力信号は4MHzで帯域制
限したものを用い、CCIR Rec405−１カーブＡ
（525本方式）のプリエンフアシスを通して、変調
した。変調度を低域（50Hz）の入力信号により、
430KHz ｐ−ｐとしたとき、中心周波数から
7.16MHz離れた点（２次のベツセル函数J2に相当
する）におけるスペクトルレベルは、中心値キヤ
リアレベルに比して、−52dBであつた。この信号
を自己の占有帯域幅である±4.5MHzのバンドパ
スフイルターを通した所、7.16MHz信号は、観測
されなくなつた。 The FM modulated wave was modulated using an NTSC standard color bar signal. The modulator input signal uses a 4MHz band-limited signal, CCIR Rec405-1 curve A.
It was modulated through pre-emphasis (525 lines method). The modulation depth is determined by the low frequency (50Hz) input signal.
When 430KHz p-p, from the center frequency
The spectral level at a point 7.16 MHz apart (corresponding to the second-order Betzel function J2 ) was -52 dB compared to the center value carrier level. When this signal was passed through a bandpass filter with its own occupied bandwidth of ±4.5MHz, the 7.16MHz signal was no longer observed.
この後、この信号を出力増幅器である飽和増幅
器に加えた所、7.16MHz離調点におけるレベル
は、−53dBまで再成された。すなわちFM信号の
リカバリ現象である。この状態で、本発明の適用
を行うことにより、−70dB以下とすることがで
き、隣接チヤンネルへ与える妨害も20dB程度軽
減された。なお最良点への調整は検波器出力レベ
ルを調整することにより行つた。 After this, when this signal was applied to a saturation amplifier which is an output amplifier, the level at the 7.16MHz detuning point was regenerated to -53dB. In other words, this is a recovery phenomenon of the FM signal. By applying the present invention in this state, it was possible to reduce the level to -70 dB or less, and the interference to adjacent channels was also reduced by about 20 dB. Note that adjustment to the best point was performed by adjusting the detector output level.
［発明の効果］
以上説明したように本発明は、狭帯域帯域制限
を受けたFM信号波を、飽和増幅器の電源電圧を
狭帯域帯域制限による振幅成分で変化させること
により、直線増幅器を用いることなく又、自己の
占有帯域外に不要スペクトルを出すことなく、増
幅することができる効果がある。[Effects of the Invention] As explained above, the present invention uses a linear amplifier to convert an FM signal wave subjected to narrow band limitation by changing the power supply voltage of a saturated amplifier with an amplitude component due to narrow band limitation. Moreover, it has the effect of being able to amplify without producing unnecessary spectrum outside its own occupied band.
一般に直線増幅器は、飽和増幅器に比して効率
が低い、消費電力が大きい、大型となるという欠
点を有しているが、本発明によれば、高効率で、
消費電力が比較的少く、小型な増幅装置を得るこ
とができる。 In general, linear amplifiers have disadvantages such as lower efficiency, higher power consumption, and larger size than saturating amplifiers, but according to the present invention, linear amplifiers have high efficiency,
A compact amplifier device with relatively low power consumption can be obtained.
なお、以上の説明では、電圧増幅器と、電流増
幅器を分離して説明したが、一体でも何ら支障が
ない事は言うまでもない。 In the above explanation, the voltage amplifier and the current amplifier have been explained separately, but it goes without saying that there is no problem if they are integrated.
第１図は本発明の一実施例に係る増幅装置のブ
ロツクダイヤグラムを示す図、第２図は飽和増幅
器の電源電圧による、入力−出力の特性を示す図
である。
１……検波器、２……増幅器、３……増幅器、
４……信号増幅用飽和増幅器。
FIG. 1 is a diagram showing a block diagram of an amplifier device according to an embodiment of the present invention, and FIG. 2 is a diagram showing input-output characteristics depending on the power supply voltage of a saturated amplifier. 1...Detector, 2...Amplifier, 3...Amplifier,
4...Saturation amplifier for signal amplification.
Claims (1)
波器により狭帯域帯域制限を受けた振幅制限・帯
域制限FM信号を増幅する非直線増幅動作FM信
号用増幅器において、 前記振幅制限・帯域制限FM信号の狭帯域帯域
制限による再発生AM信号成分を検出する検波器
と、該検波器の出力電圧を増幅する第一の増幅器
と、該増幅器出力信号により、FM信号用増幅器
のトランジスタのコレクタ又はドレイン電圧を微
小変化させる出力インピーダンスの低い第２の増
幅器を具備することを特徴とする狭帯域帯域制限
FM信号用増幅装置。[Scope of Claims] 1. An FM signal amplifier with non-linear amplification operation that amplifies an amplitude-limited/band-limited FM signal whose amplitude has been limited by a narrow-band band-limiting filter, comprising: An amplitude-limited/band-limited detector for detecting re-generated AM signal components due to narrow band-limiting of the FM signal; a first amplifier for amplifying the output voltage of the detector; and an FM signal amplifier using the output signal of the amplifier. A narrowband band-limiting device characterized by comprising a second amplifier with low output impedance that slightly changes the collector or drain voltage of the transistor.
FM signal amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60257566A JPS62118617A (en) | 1985-11-19 | 1985-11-19 | Amplifier for narrow-band band-limit fm signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60257566A JPS62118617A (en) | 1985-11-19 | 1985-11-19 | Amplifier for narrow-band band-limit fm signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62118617A JPS62118617A (en) | 1987-05-30 |
| JPH0542843B2 true JPH0542843B2 (en) | 1993-06-29 |
Family
ID=17308048
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60257566A Granted JPS62118617A (en) | 1985-11-19 | 1985-11-19 | Amplifier for narrow-band band-limit fm signal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62118617A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112770269B (en) * | 2019-11-05 | 2022-05-17 | 海能达通信股份有限公司 | Voice communication method and system in broadband and narrowband intercommunication environment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5552619A (en) * | 1978-10-13 | 1980-04-17 | Rohm Co Ltd | Limiter circuit for fm receiver |
-
1985
- 1985-11-19 JP JP60257566A patent/JPS62118617A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62118617A (en) | 1987-05-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3229328B2 (en) | System and method for out-of-band compensation of nonlinear devices | |
| US6167241A (en) | Technique for performing amplitude modulation without cheating side-bands | |
| JPH0380364B2 (en) | ||
| US4007483A (en) | Circuit for processing a color television signal prior to magnetic recording and corresponding restoring circuit | |
| KR100574641B1 (en) | Frequency Division Multiplexing Apparatus and Method | |
| JPH0542843B2 (en) | ||
| JPS581581B2 (en) | Spread spectrum communication method | |
| CA1179736A (en) | Radio transmitter modulation control circuitry | |
| JPS6049987B2 (en) | FM demodulation circuit | |
| JPS622817Y2 (en) | ||
| JPS61234104A (en) | Intermodulation suppressing characteristic improving circuit | |
| JPS60122A (en) | S/n improving circuit | |
| JPH0139243B2 (en) | ||
| JPH06334626A (en) | Spread spectrum communication system | |
| ES2168210A1 (en) | Amplifier system for digitally modulated RF signals having adjacent sideband distortion reduction | |
| SU1448356A1 (en) | Magnetic recording apparatus with dynamic magnetizing | |
| JPS6128448Y2 (en) | ||
| JPS58143609A (en) | Multi-frequency common amplifier | |
| JPH10150327A (en) | Amplifier circuit | |
| JPS5772407A (en) | Amplifying circuit | |
| CA1203289A (en) | Differential detector for demodulating fm or pm signals | |
| JPS58205383A (en) | Nonlinear compensating circuit of phase in television video transmitter | |
| JPS62172825A (en) | Emphasis system | |
| JPS5940308A (en) | Modulating system of video disk recorder | |
| JPH01316010A (en) | Frequency modulator |