JPS6316923B2 - - Google Patents
Info
- Publication number
- JPS6316923B2 JPS6316923B2 JP54064916A JP6491679A JPS6316923B2 JP S6316923 B2 JPS6316923 B2 JP S6316923B2 JP 54064916 A JP54064916 A JP 54064916A JP 6491679 A JP6491679 A JP 6491679A JP S6316923 B2 JPS6316923 B2 JP S6316923B2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- amplifier
- amplitude
- limiter
- signal
- 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
Links
- 239000000284 extract Substances 0.000 claims description 2
- 230000000087 stabilizing effect Effects 0.000 claims 1
- 230000000670 limiting effect Effects 0.000 description 13
- 230000010355 oscillation Effects 0.000 description 12
- 230000003321 amplification Effects 0.000 description 10
- 238000003199 nucleic acid amplification method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 230000003071 parasitic effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
- H03G11/002—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general without controlling loop
Landscapes
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Description
【発明の詳細な説明】
本発明は、周波数変調受信機等に用いる高周波
信号用のFM振幅制限器に関し、特に、可能な限
り使用トランジスタの個数を減らして構成を簡単
化したものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an FM amplitude limiter for high-frequency signals used in frequency modulation receivers and the like, and in particular, the number of transistors used is reduced as much as possible to simplify the configuration.
一般に高周波信号用の振幅制限器を必須の構成
要素として多用する周波数変調受信機中、特に微
弱な電波を受信するに使用する代表的な周波数変
調受信機として、衛星放送波に対する受信システ
ムの概略構成は、例えば、第１図に示すように、
放送衛星からの周波数変調マイクロ波をパラボラ
アンテナＡにより受信して第１周波数変換器Cu1
に供給し、第１局部発振器LO1の発振出力を印加
して例えばUHF帯の第１中間周波信号に変換し、
その第１中間周波信号を、第１中間周波増幅器
Ai1を介して第２周波数変換器Cu2に供給し、第２
局部発振器LO2の発振出力を印加して例えば
VHF帯の第２中間周波信号に変換し、その第２
中間周波信号を、第２中間周波増幅器Ai2、第２
中間周波通過波器Fiおよび自動利得制御器
AGCを順次に介して発振制限器LIMに供給し、
周波数変調中間周波信号における不所望の振幅変
化を除去したのち、信号処理回路Ｔに供給して、
例えば周波数変調−振幅変調変換等の適切な信号
処理を施し、例えば通常の放送受信用テレビジヨ
ン受信機に供給する。 Schematic configuration of a reception system for satellite broadcast waves, which is a typical frequency modulation receiver used to receive particularly weak radio waves among frequency modulation receivers that generally use an amplitude limiter for high frequency signals as an essential component. For example, as shown in Figure 1,
The frequency modulated microwave from the broadcasting satellite is received by the parabolic antenna A, and the first frequency converter C u1
and apply the oscillation output of the first local oscillator LO 1 to convert it into a first intermediate frequency signal in the UHF band, for example,
The first intermediate frequency signal is transmitted to a first intermediate frequency amplifier.
A i1 to the second frequency converter C u2 ;
For example, by applying the oscillation output of local oscillator LO 2 ,
Convert it to a second intermediate frequency signal in the VHF band, and
The intermediate frequency signal is transmitted to a second intermediate frequency amplifier A i2 , a second
Intermediate frequency pass filter F i and automatic gain controller
It is supplied to the oscillation limiter LIM via AGC sequentially,
After removing undesired amplitude changes in the frequency modulated intermediate frequency signal, it is supplied to a signal processing circuit T,
For example, the signal is subjected to appropriate signal processing such as frequency modulation/amplitude modulation conversion, and then supplied to, for example, a television receiver for ordinary broadcast reception.
上述のような構成による従来の周波数変調受信
機、特に、放送衛星からのマイクロ波を受信する
周波数変調受信機においては、降雨やフエーデイ
ング等の影響により受信マイクロ波のレベルが変
化したときに、少なくとも周波数弁別あるいは上
述した周波数変調−振幅変調変換等の信号処理を
施す前における周波数変調受信波のレベルを一定
に保つために、慣用の自動利得制御を施し、ある
いは、周波数変調受信波に生じた振幅変化や混入
した振幅変化の雑音成分を抑圧乃至除去して受信
出力の信号対雑音比を向上させるための振幅制限
器、すなわち、いわゆるリミタを用いることは周
知のとおりである。しかし、従来の周波数変調受
信機においては、第１図に示したように、上述し
た自動利得制御と振幅制限とを別個の回路装置に
よつて行なつており、また、かかる自動利得制御
および振幅制限の作用を十分に行なわせて満足な
結果を得るためには、多数のトランジスタ、真空
管等の能動回路素子を必要とするのが一般であつ
た。 Conventional frequency modulation receivers configured as described above, especially frequency modulation receivers that receive microwaves from broadcasting satellites, have at least a In order to keep the level of the frequency modulated received wave constant before frequency discrimination or signal processing such as the above-mentioned frequency modulation/amplitude modulation conversion, conventional automatic gain control is applied or the amplitude generated in the frequency modulated received wave is It is well known that an amplitude limiter, ie, a so-called limiter, is used to improve the signal-to-noise ratio of the received output by suppressing or removing the noise component of the change or mixed amplitude change. However, in conventional frequency modulation receivers, as shown in FIG. 1, the above-mentioned automatic gain control and amplitude limitation are performed by separate circuit devices; In order to fully perform the limiting action and obtain satisfactory results, a large number of active circuit elements such as transistors, vacuum tubes, etc. have generally been required.
すなわち、従来の自動利得制御器、すなわち、
いわゆるAGC回路は、例えば第２図に示すよう
に構成されており、多段高周波増幅器１の増幅出
力信号を検波回路２に供給してその増幅出力信号
の振幅に比例した検波出力直流電圧を取出し、そ
の検波出力直流電圧を、十分な増幅利得を有する
直流増幅器３を介して多段高周波増幅器１におけ
る適切な増幅段の利得制御入力端子に印加して、
増幅出力信号の振幅すなわちレベルができるだけ
所望の一定値となるように増幅利得の帰還制御を
行なわせていた。しかして、かかる構成の自動利
得制御器においては、多段高周波増幅器１に印加
する利得制御電圧を十分に大きくして十分な自動
利得制御作用を行なわせるためには、直流増幅器
３に供給する検波出力直流電圧を十分に大きくし
なければならず、その検波出力直流電圧を十分に
大きくするためには検波回路２に供給する増幅出
力信号を十分に大きくしなければならず、そのた
めには、多段高周波増幅器１に３〜４石以上の高
周波用トランジスタが必要であり、また、直流増
幅器３には１〜２石以上のトランジスタが必要で
あり、自動利得制御付き多段高周波増幅装置の構
成が複雑かつ高価となる欠点があるほか、高周波
増幅利得の閉ループ帰還制御により自動利得制御
を行なつているので、高利得の高周波増幅を行な
う必要がある場合には、寄生発振等の障害が発生
しやすいという欠点も併わせもつている。 That is, a conventional automatic gain controller, i.e.
The so-called AGC circuit is configured as shown in FIG. 2, for example, and supplies the amplified output signal of the multi-stage high-frequency amplifier 1 to the detection circuit 2, extracts a detected output DC voltage proportional to the amplitude of the amplified output signal, and Applying the detected output DC voltage to the gain control input terminal of an appropriate amplification stage in the multistage high frequency amplifier 1 via a DC amplifier 3 having sufficient amplification gain,
Feedback control of the amplification gain is performed so that the amplitude, or level, of the amplified output signal becomes as constant as possible. Therefore, in the automatic gain controller having such a configuration, in order to sufficiently increase the gain control voltage applied to the multistage high frequency amplifier 1 to perform a sufficient automatic gain control action, it is necessary to output the detected output to be supplied to the DC amplifier 3. The DC voltage must be made sufficiently large, and in order to make the detected output DC voltage sufficiently large, the amplified output signal supplied to the detection circuit 2 must be made sufficiently large. The amplifier 1 requires three to four or more high-frequency transistors, and the DC amplifier 3 requires one to two or more transistors, making the configuration of a multistage high-frequency amplifier with automatic gain control complex and expensive. In addition, automatic gain control is performed by closed-loop feedback control of the high-frequency amplification gain, so when it is necessary to perform high-gain high-frequency amplification, problems such as parasitic oscillation are likely to occur. Also included.
一方、従来の振幅制限器、特に代表的ないわゆ
るダイオードリミタは、例えば第３図に示すよう
に構成されており、縦続配置した多段の高周波増
幅器４，５，６における各段間に、互いに逆極性
に縦続接続したダイオードD1，D2をそれぞれ直
列に挿入し、各段増幅出力高周波信号が正極性の
ときには順方向ダイオードD1が導通して中間接
続点Ｐの電位が高くなるために逆方向ダイオード
D2が非導通となり、各段増幅出力高周波信号が
負極性のときには中間接続点Ｐの電位より低くな
るために順方向ダイオードD1が非導通となり、
結局、中間接続点Ｐの電位を中心にした正負両方
向のわずかなレベル範囲の高周波信号のみが次段
に供給されて振幅制限作用が行なわれる。したが
つて、かかる構成のダイオードリミタにおいて
は、一段当りの高周波信号の減衰が15〜20dBに
も及ぶために、図示のように多段に構成して十分
なリミタ効果が得られるようにした場合には、各
ダイオード群の段間に配置する高周波増幅器４，
５，６には十分な高周波増幅利得が必要となり、
例えば、20dB程度のリミタ効果を得るためには、
図示のとおりに、リミタ用ダイオード群２段と高
周波増幅用トランジスタ３石とが必要となり、こ
れまた、振幅制限器の構成が複雑高価となる欠点
を生じた。 On the other hand, a conventional amplitude limiter, particularly a typical so-called diode limiter, is configured as shown in FIG. Diodes D 1 and D 2 connected in cascade are inserted in series, respectively, and when the amplified output high-frequency signal of each stage has positive polarity, the forward direction diode D 1 conducts and the potential at the intermediate connection point P becomes high, so that the reverse polarity occurs. directional diode
D 2 becomes non-conductive, and when the high-frequency signal output from each stage is of negative polarity, the potential becomes lower than the potential of the intermediate connection point P, so the forward diode D 1 becomes non-conductive.
As a result, only high frequency signals within a small level range in both positive and negative directions centered on the potential at the intermediate connection point P are supplied to the next stage, and the amplitude limiting effect is performed. Therefore, in a diode limiter with such a configuration, the attenuation of high-frequency signals per stage is as much as 15 to 20 dB, so when configured in multiple stages as shown in the figure to obtain a sufficient limiter effect, is a high frequency amplifier 4 placed between stages of each diode group,
5 and 6 require sufficient high frequency amplification gain,
For example, to obtain a limiter effect of about 20dB,
As shown in the figure, two stages of limiter diode groups and three high-frequency amplification transistors are required, which also has the disadvantage that the amplitude limiter has a complicated and expensive configuration.
なお、高周波信号用の振幅制限器としては、ト
ランジスタの遮断特性を利用したトランジスタリ
ミタも従来用いられているが、振幅制限を施すべ
き高周波信号の周波数が高くなると、トランジス
タの内部容量を介して高周波信号電流が流れるた
めに、十分なリミタ効果を期待し得ない、という
本質的な欠点を有しているとともに、トランジス
タの入力インピーダンスがトランジスタに加わる
高周波電力の大きさにより変化するので、振幅制
限作用を行なわせると位相変化が生ずる、という
欠点も有している。 Transistor limiters that utilize the cut-off characteristics of transistors have also been conventionally used as amplitude limiters for high-frequency signals, but as the frequency of the high-frequency signal to which the amplitude should be limited increases, It has the essential drawback that a sufficient limiter effect cannot be expected because the signal current flows, and the input impedance of the transistor changes depending on the amount of high-frequency power applied to the transistor, so it has an amplitude limiting effect. It also has the disadvantage that a phase change occurs when this is performed.
上述したところから明らかなように、従来の周
波数変調受信機において、例えば、50dB以上の
自動利得制御作用と25dB以上の振幅制限作用と
を行なわせるには、例えば８〜９石以上の多数の
トランジスタを用いてそれらの作用を行なわせる
必要があり、それら多数のトランジスタを縦続接
続した回路構成においては、混変調や高周波信号
の浮遊結合による寄生発振が生ずる可能性が増大
するので、それらの障害発生を抑圧防止するため
に、例えば段間に適切な低域通過波器を挿入す
るなど、回路構成上若干の処置を施す必要がある
ために、回路構成が一層複雑化する欠点があつ
た。 As is clear from the above, in a conventional frequency modulation receiver, in order to perform an automatic gain control function of 50 dB or more and an amplitude limiting function of 25 dB or more, a large number of transistors, for example 8 to 9 transistors or more, are required. In a circuit configuration in which a large number of transistors are connected in cascade, there is an increased possibility that parasitic oscillations will occur due to cross-modulation and stray coupling of high-frequency signals. In order to prevent this from being suppressed, it is necessary to take some measures in terms of the circuit configuration, such as inserting an appropriate low-pass waveform between the stages, which has the disadvantage of making the circuit configuration even more complicated.
本発明の目的は、上述した従来の欠点を除去
し、自動利得制御機能と振幅制限機能とを併わせ
て保有し、可能な限り使用トランジスタの個数を
低減し、しかも、良好な特性が得られるようにし
た、構成が簡単で低価格の振幅制限器を提供する
ことにある。 It is an object of the present invention to eliminate the above-mentioned conventional drawbacks, to have both an automatic gain control function and an amplitude limiting function, to reduce the number of transistors used as much as possible, and to obtain good characteristics. The object of the present invention is to provide an amplitude limiter having a simple configuration and low cost.
すなわち、本発明FM振幅制限器は、ダイオー
ドリミタと、入出力電極間に互いに逆極性にして
並列に接続したダイオード対を接続して前記ダイ
オードリミタのFM出力信号を増幅するトランジ
スタ増幅器よりなる非線形帰還増幅器と、その非
線形帰還増幅器のFM出力信号により抵抗減衰器
を介して駆動するとともにFM出力信号を抵抗減
衰器を介して取出すロツキング増幅器とを順次に
備えて、広いレベル範囲のFM入力信号にレベル
範囲に応じた振幅制限をそれぞれ安定に施すよう
にしたことを特徴とするものである。 That is, the FM amplitude limiter of the present invention has a nonlinear feedback system that includes a diode limiter and a transistor amplifier that amplifies the FM output signal of the diode limiter by connecting a pair of diodes connected in parallel with opposite polarities between input and output electrodes. An amplifier and a locking amplifier that is driven through a resistive attenuator by the FM output signal of the nonlinear feedback amplifier and takes out the FM output signal through the resistive attenuator are sequentially provided to adjust the level of the FM input signal over a wide level range. The present invention is characterized in that amplitude limits are stably applied depending on the range.
かかる特徴を有する本発明FM振幅制限器の構
成例を第４図に示す。第４図に示す構成の振幅制
限器においては、入力高周波信号を、高周波増幅
器７を介して、従来と同様に構成した１段のダイ
オードリミタ８に供給し、約10dBの振幅制限を
施した出力高周波信号を第５図に示すような構成
の非線形帰還増幅部９に供給し、その増幅出力高
周波信号を、抵抗減衰器１０を介して適切なレベ
ルに調整したうえで、ロツキング増幅器１１に印
加し、入力高周波信号に周波数ロツクした一定振
幅の発振出力高周波信号を発生させ、その周波数
ロツク発振出力高周波信号を、抵抗減衰器１２お
よび高周波増幅器１３を順次に介して、安定に適
切な所望レベルに増幅したうえで取出し、周波数
変調された入力高周波信号のとおりに周波数変調
され、しかも、振幅がほぼ完全に一定の振幅制限
出力高周波信号が得られるようにする。 An example of the configuration of the FM amplitude limiter of the present invention having such characteristics is shown in FIG. In the amplitude limiter having the configuration shown in FIG. 4, an input high-frequency signal is supplied via a high-frequency amplifier 7 to a one-stage diode limiter 8 configured in the same manner as before, and an output with an amplitude limit of about 10 dB is applied. A high frequency signal is supplied to a nonlinear feedback amplifier 9 having a configuration as shown in FIG. , generates an oscillation output high-frequency signal with a constant amplitude whose frequency is locked to the input high-frequency signal, and stably amplifies the frequency-locked oscillation output high-frequency signal to an appropriate desired level through the resistor attenuator 12 and the high-frequency amplifier 13 in sequence. Then, it is taken out, and an amplitude-limited output high-frequency signal is obtained which is frequency-modulated in accordance with the frequency-modulated input high-frequency signal and whose amplitude is almost completely constant.
かかる構成の振幅制限器においては、ダイオー
ドリミタ８は比較的高レベルの入力高周波信号に
対する振幅制限作用を行なわせるとともに、入力
高周波信号の信号レベルの大小に拘らずつねに一
定レベルの出力信号を形成する作用を併わせて行
ない、また、特に非線形素子を用いて帰還増幅を
行なうようにした次段の非線形帰還増幅部９は、
高レベルの入力高周波信号に対しては高利得の負
帰還を施して増幅出力高周波信号のレベルを一定
に保持し得る高効率かつ高速の自動利得制御作用
と増幅素子の飽和現象による振幅制限作用とを併
わせて行なつている。 In the amplitude limiter having such a configuration, the diode limiter 8 performs an amplitude limiting action on a relatively high level input high frequency signal, and always forms an output signal of a constant level regardless of the signal level of the input high frequency signal. The next stage nonlinear feedback amplification section 9 performs the following functions and also performs feedback amplification using nonlinear elements.
A high-efficiency and high-speed automatic gain control function that can maintain a constant level of the amplified output high-frequency signal by applying high-gain negative feedback to high-level input high-frequency signals, and an amplitude limiting function due to the saturation phenomenon of the amplification element. We are also doing this together.
一方、比較的低レベルの入力高周波信号に対す
る振幅制限作用と自動利得制御作用とは、さらに
次段のロツキング増幅器１１によつて行ない、そ
のロツキング増幅器１１の前後に挿入した抵抗減
衰器１０および１２は、ロツキング増幅器１１の
入出力負荷インピーダンスをつねに安定させ、入
力高周波信号に周波数ロツクした発振を安定に行
なわせて、広い周波数範囲にわたつて周波数ロツ
クした安定な一定振幅の増幅出力高周波信号が得
られるようにしたものである。 On the other hand, the amplitude limiting action and automatic gain control action for a relatively low-level input high-frequency signal are carried out by the locking amplifier 11 in the next stage, and the resistive attenuators 10 and 12 inserted before and after the locking amplifier 11 are , the input/output load impedance of the locking amplifier 11 is always stabilized, and oscillation with the frequency locked to the input high frequency signal is performed stably, thereby obtaining an amplified output high frequency signal with a stable constant amplitude and frequency locked over a wide frequency range. This is how it was done.
つぎに、非線形帰還増幅部９およびロツキング
増幅器１１の具体的回路構成の例を第５図および
第６図にそれぞれ示す。 Next, examples of specific circuit configurations of the nonlinear feedback amplifier section 9 and the locking amplifier 11 are shown in FIGS. 5 and 6, respectively.
第５図に示す非線形帰還増幅器の回路構成にお
いては、互いに逆極性にして並列に接続し、プツ
シユプル接続の状態にした２個の例えばシヨツト
キーダイオートDSをコンデンサCFを介して通常
の構成のトランジスタ増幅器におけるコレクタ・
ベース間に帰還接続してあり、ここでプツシユプ
ル接続にした２個のダイオードDSをコンデンサ
CFに直列に接続したのは、高周波帰還用コンデ
ンサに非線形帰還特性を付与する一方のダイオー
ドDSの整流電流によりその帰還用コンデンサCF
が充電されてトランジスタ増幅器の動作電位が偏
移するのを防止するためである。 In the circuit configuration of the nonlinear feedback amplifier shown in Fig. 5, two Schottky diodes, for example, which are connected in parallel with opposite polarities and are in a push-pull connection state, are connected via a capacitor C F to a normal The collector in a transistor amplifier with
A feedback connection is made between the bases, and the two diodes D S connected in a push-pull manner are connected to the capacitor.
What is connected in series with C F is the feedback capacitor C F
This is to prevent the operating potential of the transistor amplifier from shifting due to charging.
また、第６図に示すロツキング増幅器の回路構
成においては、トランジスタ増幅器Ｔにインダク
タンスLCおよびコンデンサCC，C1，C2を図示の
ように接続してコルピツツ型発振回路を構成して
自由発振を行なわせ、そのトランジスタ増幅器の
ベース端子に前段からの高周波信号を注入して、
発振出力高周波信号の周波数を、周波数変調され
た入力高周波信号の刻々の周波数に忠実にロツク
させる。 In addition, in the circuit configuration of the locking amplifier shown in Fig. 6, an inductance L C and capacitors C C , C 1 , C 2 are connected to the transistor amplifier T as shown in the figure to form a Colpitts type oscillation circuit, allowing free oscillation. The high frequency signal from the previous stage is injected into the base terminal of the transistor amplifier.
To faithfully lock the frequency of an oscillation output high-frequency signal to the instantaneous frequency of a frequency-modulated input high-frequency signal.
なお、かかる回路構成の非線形帰還増幅部９お
よびロツク増幅器１１を用いた第４図示の本発明
FM振幅制限器において、50dB以上の自動利得制
御作用および25dB以上の振幅制限作用を行なわ
せたときには、中心周波数130MHz、帯域幅25M
Hzの周波数範囲にわたつて十分に満足し得る性能
が得られた。 Note that the present invention shown in FIG. 4 uses the nonlinear feedback amplifier section 9 and the lock amplifier 11 having such a circuit configuration.
In the FM amplitude limiter, when automatic gain control action of 50 dB or more and amplitude limiting action of 25 dB or more are performed, the center frequency is 130 MHz and the bandwidth is 25 M.
Fully satisfactory performance was obtained over the Hz frequency range.
すなわち、本発明FM振幅制限器における作用
効果の特徴とするところは、従来は自動利得制御
回路と振幅制限回路との双方を別個にそれぞれ備
えて達成していた作用効果を同一回路装置により
達成しており、しかも、かかる二様の作用効果
を、入力高周波信号の信号レベルが高いときと低
いときとに対して、ダイオードリミタ、非線形帰
還増幅部およびロツキング増幅器を効率よく適切
に使い分けてそれぞれ適切な機能を分担させ、効
果的に達成していることであり、その結果とし
て、従来の自動利得制御回路に必要であつた高利
得の直流増幅器を全く必要とせず、省略すること
ができ、しかも、従来のダイオードリミタにおい
て各段間に必要としていた高周波増幅器の使用個
数を格段に低減することができた。これを具体的
に説明すれば、第２図および第３図にそれぞれ示
した従来装置に必要とした10〜15石のトランジス
タが、第４図に示した構成の本発明FM振幅制限
器では５石のみ必要とするに留まる。 In other words, the FM amplitude limiter of the present invention is characterized in that the same circuit device achieves the functions and effects that conventionally were achieved by separately providing both an automatic gain control circuit and an amplitude limiting circuit. Moreover, these two types of effects can be achieved by efficiently and appropriately using the diode limiter, nonlinear feedback amplifier, and locking amplifier for when the signal level of the input high-frequency signal is high and when the signal level is low. This is achieved effectively by sharing the functions, and as a result, there is no need for a high-gain DC amplifier, which is required in conventional automatic gain control circuits, and it is possible to omit it. The number of high-frequency amplifiers required between each stage in conventional diode limiters can be significantly reduced. To explain this specifically, the FM amplitude limiter of the present invention with the configuration shown in FIG. Only stones are needed.
以上の説明から明らかなように、本発明によれ
ば、従来は自動利得制御回路とダイオードリミタ
等のいわゆる振幅制限回路とを別個に備えて達成
していた作用効果を単一の回路装置により達成し
得るので使用するトランジスタの個数を格段に低
減させることができ、回路構成が著しく簡単化さ
れるとともに低価格となり、しかも、高周波浮遊
結合による不所望の寄生発振や混変調等の障害の
発生も格段に少なくなり、自動利得制御および振
幅制限の性能を従来に比し格段に向上させ、か
つ、安定化することができる。また、従来の自動
利得制御に必要であつた帰還ループが不要となる
ので、一層安定化することができる。 As is clear from the above description, according to the present invention, the effects that were conventionally achieved by separately providing an automatic gain control circuit and a so-called amplitude limiting circuit such as a diode limiter can be achieved with a single circuit device. This makes it possible to significantly reduce the number of transistors used, significantly simplifying the circuit configuration and lowering the cost.Furthermore, it eliminates the occurrence of problems such as undesired parasitic oscillation and cross-modulation due to high-frequency stray coupling. The performance of automatic gain control and amplitude limiting can be significantly improved and stabilized compared to conventional methods. Further, since the feedback loop required in conventional automatic gain control is not required, further stability can be achieved.
第１図は周波数変調受信機の概略構成を示すブ
ロツク線図、第２図は従来の自動利得制御回路の
概略構成を示すブロツク線図、第３図は従来の振
幅制限回路の構成を示すブロツク線図、第４図は
本発明FM振幅制限器の構成例を示すブロツク線
図、第５図は同じくその非線形帰還増幅器の具体
的構成の例を示す回路図、第６図は同じくそのロ
ツキング増幅器の具体的構成の例を示す回路図で
ある。
１……多段高周波増幅器、２……検波回路、３
……直流増幅器、４，５，６，７，１３……高周
波増幅器、８……ダイオードリミタ、９……非線
形帰還増幅器、１０，１２……抵抗減衰器、１１
……ロツキング増幅器、Cu1，Cu2……周波数変換
器、Ai1，Ai2……中間周波増幅器、LO1，LO2…
…局部発振器、Fi……中間周波波器、AGC…
…自動利得制御器、LIM……振幅制限器、Ｔ…
…信号処理装置、D1，D2，DS……ダイオード、
CF，CC，C1，C2……コンデンサ、LC……インダ
クタンス、Ｔ……トランジスタ。
Fig. 1 is a block diagram showing the schematic configuration of a frequency modulation receiver, Fig. 2 is a block diagram showing the schematic configuration of a conventional automatic gain control circuit, and Fig. 3 is a block diagram showing the configuration of a conventional amplitude limiting circuit. 4 is a block diagram showing an example of the configuration of the FM amplitude limiter of the present invention, FIG. 5 is a circuit diagram showing an example of a specific configuration of the nonlinear feedback amplifier, and FIG. 6 is a block diagram of the locking amplifier. FIG. 2 is a circuit diagram showing an example of a specific configuration. 1... Multi-stage high frequency amplifier, 2... Detection circuit, 3
...DC amplifier, 4, 5, 6, 7, 13 ... High frequency amplifier, 8 ... Diode limiter, 9 ... Nonlinear feedback amplifier, 10, 12 ... Resistance attenuator, 11
... Locking amplifier, C u1 , C u2 ... Frequency converter, A i1 , A i2 ... Intermediate frequency amplifier, LO 1 , LO 2 ...
...Local oscillator, F i ...Intermediate frequency generator, AGC...
...Automatic gain controller, LIM...Amplitude limiter, T...
...signal processing device, D 1 , D 2 , D S ... diode,
C F , C C , C 1 , C 2 ... Capacitor, L C ... Inductance, T ... Transistor.
Claims (1)
逆極性にして並列に接続したダイオード対を接続
して前記ダイオードリミタのFM出力信号を増幅
するトランジスタ増幅器よりなる非線形帰還増幅
器と、その非線形帰還増幅器のFM出力信号によ
り抵抗減衰器を介して駆動するとともにFM出力
信号を抵抗減衰器を介して取出すロツキング増幅
器とを順次に備えて、広いレベル範囲のFM入力
信号にレベル範囲に応じた振幅制限をそれぞれ安
定に施すようにしたことを特徴とするFM振幅制
限器。1. A nonlinear feedback amplifier consisting of a diode limiter and a transistor amplifier that amplifies the FM output signal of the diode limiter by connecting a pair of diodes connected in parallel with opposite polarities between the input and output electrodes, and the FM of the nonlinear feedback amplifier. It is equipped with a locking amplifier that is driven by the output signal through a resistive attenuator and also extracts the FM output signal through the resistive attenuator, stabilizing the amplitude limit according to the level range for the FM input signal over a wide level range. An FM amplitude limiter characterized in that the FM amplitude limiter is applied to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6491679A JPS55158716A (en) | 1979-05-28 | 1979-05-28 | Amplitude limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6491679A JPS55158716A (en) | 1979-05-28 | 1979-05-28 | Amplitude limiter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55158716A JPS55158716A (en) | 1980-12-10 |
| JPS6316923B2 true JPS6316923B2 (en) | 1988-04-12 |
Family
ID=13271841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6491679A Granted JPS55158716A (en) | 1979-05-28 | 1979-05-28 | Amplitude limiter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55158716A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6199404A (en) * | 1984-10-19 | 1986-05-17 | Dx Antenna Co Ltd | Amplitude limiter |
| JPH0614605B2 (en) * | 1984-10-19 | 1994-02-23 | デイエツクスアンテナ株式会社 | Amplitude limiter |
| JPH0196868A (en) * | 1987-10-08 | 1989-04-14 | Pioneer Electron Corp | Recording information reproducing device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5044027U (en) * | 1973-08-17 | 1975-05-02 |
-
1979
- 1979-05-28 JP JP6491679A patent/JPS55158716A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5044027U (en) * | 1973-08-17 | 1975-05-02 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55158716A (en) | 1980-12-10 |
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