JPH0523645B2 - - Google Patents

Info

Publication number
JPH0523645B2
JPH0523645B2 JP60259324A JP25932485A JPH0523645B2 JP H0523645 B2 JPH0523645 B2 JP H0523645B2 JP 60259324 A JP60259324 A JP 60259324A JP 25932485 A JP25932485 A JP 25932485A JP H0523645 B2 JPH0523645 B2 JP H0523645B2
Authority
JP
Japan
Prior art keywords
output
level
voltage
modulated wave
wave
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
Application number
JP60259324A
Other languages
Japanese (ja)
Other versions
JPS62118614A (en
Inventor
Shiro Taniguchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
Nippon Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Electric Co Ltd filed Critical Nippon Electric Co Ltd
Priority to JP60259324A priority Critical patent/JPS62118614A/en
Publication of JPS62118614A publication Critical patent/JPS62118614A/en
Publication of JPH0523645B2 publication Critical patent/JPH0523645B2/ja
Granted legal-status Critical Current

Links

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Landscapes

  • Amplitude Modulation (AREA)

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は、変調周波数が高い場合に適するAM
変調回路に関する。[Detailed Description of the Invention] (Industrial Application Field) The present invention is an AM system suitable for high modulation frequencies.
Related to modulation circuits.

（従来の技術） 一般に、AM変調回路では、変調歪及び変調度
の安定度を向上するために負帰還検波方式を採用
している。(Prior Art) AM modulation circuits generally employ a negative feedback detection method to improve modulation distortion and modulation degree stability.

（発明が解決しようとする問題点） ところが、従来のAM変調回路では、変調周波
数が高い場合に負帰還量がないか又はあつてもわ
ずかであり、変調度の安定性に問題があつた。(Problems to be Solved by the Invention) However, in the conventional AM modulation circuit, when the modulation frequency is high, there is no negative feedback amount, or even if there is, there is only a small amount of negative feedback, and there is a problem with the stability of the modulation degree.

そこで、本発明の目的は変調度の安定性に優れ
たAM変調回路の提供にある。 Therefore, an object of the present invention is to provide an AM modulation circuit with excellent modulation degree stability.

（問題点を解決するための手段） 前述の問題点を解決するために本発明が提供す
るAM変調回路は、搬送波発振器の出力を変調波
によりAM変調するAM変調器と、このAM変調
器の出力の被変調波を増幅する利得可変の被変調
波増幅回路と、この被変調波増幅回路の出力の被
変調波をAM検波するAM検波器と、このAM検
波器の出力のうちの前記変調波の成分を除去し、
搬送波のレベルに相当する第１の直流電圧を取り
出す第１炉波器と、予め搬送波レベルに相当する
第２の直流電圧を設定する搬送波レベル設定器
と、前記第１の直流電圧と 前記第２の直流電圧との差の電圧を出力する第１
比較器と、前記AM検波器の出力のうちの前記変
調波の成分を取り出す第２炉波器と、この第２炉
波器の出力の前記変調波成分を整流し、変調波の
レベルに相当する第３の直流電圧を取り出す整流
器と、前記搬送波レベルにおける所定の変調度に
相当する第４の直流電圧を設定する変調レベル設
定器と、前記第３の直流電圧と前記第４の直流電
圧との差の電圧を出力する第２比較器と、この第
２比較器の出力電圧により前記変調波のレベルを
調整する可変減衰器とを備え、前記被変調波増幅
回路は前記第１比較器の出力電圧のレベルが最小
になるように前記第１比較器の出力電圧に応じて
利得を調整し、前記可変減衰器は第２比較器の出
力電圧のレベルが最小になるように前記第２比較
器の出力電圧に応じて減衰量を調整し、前記第１
及び第２の比較器の出力電圧の極性は前記被変調
波増幅回路の出力の被変調波における搬送波成分
のレベル及び変調度をそれぞれ安定化する方向で
あることを特徴とする。(Means for Solving the Problems) In order to solve the above-mentioned problems, the AM modulation circuit provided by the present invention includes an AM modulator that performs AM modulation on the output of a carrier wave oscillator using a modulated wave; a modulated wave amplification circuit with variable gain that amplifies the output modulated wave; an AM detector that performs AM detection on the output modulated wave of the modulated wave amplification circuit; and an AM detector that performs AM detection on the output modulated wave of the AM detector. Remove wave components,
a first reactor wave generator that extracts a first DC voltage corresponding to the carrier wave level; a carrier wave level setter that sets in advance a second DC voltage corresponding to the carrier wave level; The first output voltage is the difference between the DC voltage and the
a comparator, a second reactor waver for extracting the modulated wave component of the output of the AM detector, and a rectifier for rectifying the modulated wave component of the output of the second reactor waver, which corresponds to the level of the modulated wave. a modulation level setter that sets a fourth DC voltage corresponding to a predetermined degree of modulation at the carrier wave level; and a variable attenuator that adjusts the level of the modulated wave using the output voltage of the second comparator. The gain is adjusted according to the output voltage of the first comparator so that the level of the output voltage is minimized, and the variable attenuator adjusts the gain according to the output voltage of the second comparator so that the level of the output voltage of the second comparator is minimized. The amount of attenuation is adjusted according to the output voltage of the device, and the first
The polarity of the output voltage of the second comparator is characterized in that the polarity of the output voltage of the second comparator is in a direction that stabilizes the level and degree of modulation of the carrier wave component in the modulated wave output from the modulated wave amplification circuit.

（実施例） 次に、本発明について図面を参照して説明す
る。(Example) Next, the present invention will be described with reference to the drawings.

第１図は本発明の一実施例のブロツク図であ
る。AM変調器２は、搬送波発振器１の出力の搬
送波１０１を変調波１１０でAM変調し、被変調
波１０２を出力する。変調波発生器９の出力１０
９は、可変減衰器１０によりレベル調整され変調
波１１０となる。利得可変の被変調波増幅器３
は、被変調波１０２を所要の搬送波出力レベルま
で増幅し、被変調波１０３を出力する。この被変
調波増幅器３の利得は、周囲条件の変化に対して
搬送波出力が一定になるように、第１比較器１４
の出力１１４で自動調整される。この被変調波増
幅器３の出力１０３は結合器４を通して出力端子
１５に出力される。結合器４は、出力の一部を抽
出するものであり、この出力１０４ｂはAM検波
器５によりAM検波される。このAM検波器５の
出力１０５のうちの１つは第１波器６に供給さ
れる。第１波器６は、出力１０５から変調波を
除去し、搬送波レベルに相当する直流電圧１０６
を取り出し、比較器１４に加える。搬送波レベル
設定器１３は搬送波レベルの基準直流電圧発生源
であり、この出力１１３ａと前記第１波器６の
出力の直流電圧１０６とが第１比較器１４で比較
され、この出力が誤差電圧１１４として被変調波
増幅回路３の利得を調整し、搬送波出力レベルを
一定にするように動作する。そこで、搬送波出力
レベルは、搬送波レベル設定器１３により直流電
圧１１３ａを調整する事により所要のレベルの設
定する事ができる。 FIG. 1 is a block diagram of one embodiment of the present invention. The AM modulator 2 performs AM modulation on the carrier wave 101 output from the carrier wave oscillator 1 with a modulated wave 110, and outputs a modulated wave 102. Output 10 of modulated wave generator 9
9 is level-adjusted by a variable attenuator 10 and becomes a modulated wave 110. Variable gain modulated wave amplifier 3
amplifies the modulated wave 102 to a required carrier wave output level and outputs the modulated wave 103. The gain of the modulated wave amplifier 3 is determined by the first comparator 14 so that the carrier wave output is constant against changes in ambient conditions.
It is automatically adjusted by the output 114 of. The output 103 of the modulated wave amplifier 3 is outputted to the output terminal 15 through the coupler 4. The coupler 4 extracts a part of the output, and this output 104b is subjected to AM detection by the AM detector 5. One of the outputs 105 of this AM detector 5 is supplied to the first wave detector 6. The first wave generator 6 removes the modulated wave from the output 105 and outputs a DC voltage 106 corresponding to the carrier wave level.
is taken out and added to the comparator 14. The carrier wave level setter 13 is a reference DC voltage generation source of the carrier wave level, and this output 113a and the DC voltage 106 output from the first wave generator 6 are compared in the first comparator 14, and this output is used as the error voltage 114. It operates to adjust the gain of the modulated wave amplification circuit 3 and keep the carrier wave output level constant. Therefore, the carrier wave output level can be set to a required level by adjusting the DC voltage 113a using the carrier wave level setter 13.

AM検波器５の出力１０５は第２波器７にも
加えられる。この波器７は変調波成分１０７だ
けを取り出さす。整流器８は、変調波成分１０７
を整流し、変調度に比例する直流電圧１０８を取
り出し、第２比較器１２に加える。 The output 105 of the AM detector 5 is also applied to the second wave detector 7. This wave generator 7 extracts only the modulated wave component 107. The rectifier 8 has a modulated wave component 107.
is rectified, a DC voltage 108 proportional to the modulation degree is taken out, and applied to the second comparator 12.

搬送波レベル設定器１３は、直流電圧１１３ａ
と同じ大きさの直流電圧１１３ｂを出力し、この
直流電圧１１３ｂは変調レベル設定器１１に加え
られる。変調レベル設定器１１は、直流電圧１１
３ｂに応じて所要の変調度が得られるように設定
した直流電圧１１１を出力する。第２比較器１２
は、直流電圧１１１と整流器８の出力の直流電圧
１０８とを比較し、これら両直流電圧の差の電圧
を誤差電圧１１２として可変減衰器１０に加え
る。可変減衰器１０は、変調波発生器９の出力１
０９を受け、誤差電圧１１２に応じた減衰を出力
１０９に加えてレベルを調整し、調整した変調波
１１０をAM変調器２に加え、所要の変調度にな
るように動作する。なお、第１比較器１４及び第
２比較器１２の極性は、出力１０４ａが増大した
ときは、その出力１０４ａを減少させるように選
定してある。 The carrier wave level setter 13 uses a DC voltage 113a.
This DC voltage 113b is applied to the modulation level setter 11. The modulation level setter 11 controls the DC voltage 11
3b, a DC voltage 111 that is set so as to obtain a required degree of modulation is output. Second comparator 12
compares the DC voltage 111 and the DC voltage 108 output from the rectifier 8, and applies the difference between these two DC voltages to the variable attenuator 10 as an error voltage 112. The variable attenuator 10 outputs the output 1 of the modulated wave generator 9.
09, attenuation according to the error voltage 112 is applied to the output 109 to adjust the level, and the adjusted modulated wave 110 is applied to the AM modulator 2, which operates to obtain the required modulation degree. Note that the polarities of the first comparator 14 and the second comparator 12 are selected so that when the output 104a increases, the output 104a decreases.

（発明の効果） 本発明のAM変調回路では、以上に説明したよ
うに、変調周波数が高い場合にも、搬送波レベル
のみならず、変調波の振幅すなわち変調度も負帰
還する事が可能となり、搬送波レベル及び変調度
を安定化する事ができる。(Effects of the Invention) As explained above, in the AM modulation circuit of the present invention, even when the modulation frequency is high, not only the carrier wave level but also the amplitude of the modulated wave, that is, the modulation degree, can be negatively fed back. The carrier wave level and modulation degree can be stabilized.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の一実施例を示すブロツク図で
ある。 FIG. 1 is a block diagram showing one embodiment of the present invention.

Claims (1)

【特許請求の範囲】[Claims] １ 搬送波発振器の出力を変調波によりAM変調
するAM変調器と、このAM変調器の出力の被変
調波を増幅する利得可変の被変調波増幅回路と、
この被変調波増幅回路の出力の被変調波をAM検
波するAM検波器と、このAM検波器の出力のう
ちの前記変調波の成分を除去し、搬送波のレベル
に相当する第１の直流電圧を取り出す第１炉波器
と、予め搬送波レベルに相当する第２の直流電圧
を設定する搬送波レベル設定器と、前記第１の直
流電圧と前記第２の直流電圧との差の電圧を出力
する第１比較器と、前記AM検波器の出力のうち
の前記変調波の成分を取り出す第２炉波器と、こ
の第２炉波器の出力の前記変調波成分を整流し、
変調波のレベルに相当する第３の直流電圧を取り
出す整流器と、前記搬送波レベルにおける所定の
変調度に相当する第４の直流電圧を設定する変調
レベル設定器と、前記第３の直流電圧と前記第４
の直流電圧との差の電圧を出力する第２比較器
と、この第２比較器の出力電圧により前記変調波
のレベルを調整する可変減衰器とを備え、前記被
変調波増幅回路は前記第１比較器の出力電圧のレ
ベルが最小になるように前記第１比較器の出力電
圧に応じて利得を調整し、前記可変減衰器は第２
比較器の出力電圧のレベルが最小になるように前
記第２比較器の出力電圧に応じて減衰量を調整
し、前記第１及び第２の比較器の出力電圧の極性
は前記被変調波増幅回路の出力の被変調波におけ
る搬送波成分のレベル及び変調度をそれぞれ安定
化する方向であることを特徴とするAM変調回
路。1. An AM modulator that performs AM modulation on the output of a carrier wave oscillator using a modulated wave, and a variable gain modulated wave amplification circuit that amplifies the modulated wave output from the AM modulator.
An AM detector that performs AM detection on the modulated wave output from the modulated wave amplification circuit, and a first DC voltage that removes the modulated wave component from the output of the AM detector and that corresponds to the level of the carrier wave. a carrier wave level setter that presets a second DC voltage corresponding to the carrier wave level; and a carrier wave level setter that outputs a voltage that is the difference between the first DC voltage and the second DC voltage. a first comparator, a second reactor wave generator that extracts the modulated wave component of the output of the AM detector, and rectifies the modulated wave component of the output of the second reactor wave detector;
a rectifier that takes out a third DC voltage corresponding to the level of the modulated wave; a modulation level setter that sets a fourth DC voltage corresponding to a predetermined degree of modulation at the carrier wave level; Fourth
and a variable attenuator that adjusts the level of the modulated wave by the output voltage of the second comparator, and the modulated wave amplification circuit The gain is adjusted according to the output voltage of the first comparator so that the level of the output voltage of the first comparator is minimized, and the variable attenuator
The amount of attenuation is adjusted according to the output voltage of the second comparator so that the level of the output voltage of the comparator is minimized, and the polarity of the output voltage of the first and second comparators is adjusted according to the modulated wave amplification. An AM modulation circuit characterized in that the direction is to stabilize the level and modulation degree of a carrier wave component in a modulated wave output from the circuit.
JP60259324A 1985-11-19 1985-11-19 Am modulation circuit Granted JPS62118614A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60259324A JPS62118614A (en) 1985-11-19 1985-11-19 Am modulation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60259324A JPS62118614A (en) 1985-11-19 1985-11-19 Am modulation circuit

Publications (2)

Publication Number Publication Date
JPS62118614A JPS62118614A (en) 1987-05-30
JPH0523645B2 true JPH0523645B2 (en) 1993-04-05

Family

ID=17332503

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60259324A Granted JPS62118614A (en) 1985-11-19 1985-11-19 Am modulation circuit

Country Status (1)

Country Link
JP (1) JPS62118614A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0718697U (en) * 1992-12-22 1995-04-04 東和産業株式会社 Toilet corner box

Also Published As

Publication number Publication date
JPS62118614A (en) 1987-05-30

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