JPS6243907A - Amplitude modulation circuit - Google Patents
Amplitude modulation circuitInfo
- Publication number
- JPS6243907A JPS6243907A JP60184716A JP18471685A JPS6243907A JP S6243907 A JPS6243907 A JP S6243907A JP 60184716 A JP60184716 A JP 60184716A JP 18471685 A JP18471685 A JP 18471685A JP S6243907 A JPS6243907 A JP S6243907A
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- pulse
- modulation
- feedback
- amplitude
- 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.)
- Granted
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)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は中波及び短波放送機などに用いられパルス幅変
調による直列変調を行って音声増幅する振幅変調回路に
関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an amplitude modulation circuit that is used in medium wave and short wave broadcasting equipment and performs serial modulation using pulse width modulation to amplify audio.
従来、パルス幅変調を用いた中波放送機は、ノ(シス電
力増幅器用終段電源としてhc*圧を整流したままの非
安定化電源全使用している。従来の放送機の系統図とし
て、第4図に示すものがある。Traditionally, medium-wave broadcasting equipment using pulse width modulation uses an unregulated power supply with rectified hc* voltage as the final stage power supply for the sys power amplifier.As a system diagram of a conventional broadcasting equipment, , as shown in Figure 4.
図中%1は音声入力端子、2,3.6は音声増幅器、4
は比較器、5はパルス増幅器、7は100K[(zの副
搬送波発振器、8tjDC電源入力端子、9ilパルス
電力電力器、IOH低域通過フィルタ、11は高周波増
幅器、12ij振幅変調出力端子でおる。In the figure, %1 is an audio input terminal, 2, 3.6 is an audio amplifier, 4
is a comparator, 5 is a pulse amplifier, 7 is a 100K [(z subcarrier oscillator, 8tj DC power input terminal, 9il pulse power generator, IOH low pass filter, 11 is a high frequency amplifier, and 12ij is an amplitude modulation output terminal.
この放送機としては、直列変調方式でおるため、パルス
電力増幅器9がチi*yパ一方式のDCニーDCコンバ
ータと同等の働itするため、低域通過フィルタlOか
らの鷹派帰還により電源変動を抑さえ、高周波増幅器1
1に印加さnるDC電圧’t −だに保つ制御が可能と
なり、パルス電力増幅器9が高周波出力電力の安定化を
しているため、DC電源が非安定化でも出力の安定化が
可能でおる。Since this broadcasting machine uses a series modulation method, the pulse power amplifier 9 works equivalent to a one-way DC-knee DC converter, so the power supply fluctuates due to the hawk feedback from the low-pass filter IO. High frequency amplifier 1
Since the pulse power amplifier 9 stabilizes the high frequency output power, the output can be stabilized even if the DC power source is unstable. is.
一方、この放送機は振幅変調を行なう必要がめるため、
パルス電力増幅器9のONとOFF の周期を音声信号
で変化させるパルス幅変調を行なっている。On the other hand, since this broadcaster requires amplitude modulation,
Pulse width modulation is performed in which the ON and OFF cycles of the pulse power amplifier 9 are changed by the audio signal.
第5図(al 、 (blはこのパルス幅変調の動作を
示す波形図である。例えば、無変調時のパルス電力増幅
器9のONとoppO比をl)C電源人力V、の時、第
5図1a)VC示すようにA対Bとした場合、100チ
^調時は音声信号の振幅により幅Aを0から2人まで堂
化させる。次KDC電源人力■・が+αチ変化した場合
、第5図fblのように、パルスのONと0Fl−の比
を変化させ高周波増幅器11のDC電圧を一定にするよ
うに動作させる。この場合、パルス電力増幅器9 Q)
(J N幅は1/(l+α)になる。FIG. 5 (al and bl are waveform diagrams showing the operation of this pulse width modulation. For example, when the ON and oppO ratios of the pulse power amplifier 9 in the non-modulated state are In the case of A versus B as shown in FIG. 1a) VC, when adjusting to 100 degrees, the width A varies from 0 to 2 people depending on the amplitude of the audio signal. Next, when the KDC power supply voltage changes by +α, as shown in FIG. In this case, the pulse power amplifier 9 Q)
(JN width is 1/(l+α).
この状態で100係変調するためVCは0〜2A/1禮
変化させ彦ければならないので、変調感度がα饅変動す
ることになり、またこの電源電圧変動が振幅変調波の歪
として現扛ることとなる。In order to perform 100 modulation in this state, the VC must be changed by 0 to 2 A/1, so the modulation sensitivity will fluctuate by α, and this power supply voltage fluctuation will appear as distortion of the amplitude modulated wave. It happens.
本発明の目的は、このような問題r1イ決し、音声増幅
器の増+19Jtk直流帰還で制御することりこより、
電f@電圧の′&動に対するφを少くした損暢変調器を
提供することKある。The purpose of the present invention is to eliminate such problems, and to control the audio amplifier by increasing the audio amplifier + 19Jtk DC feedback.
It is an object of the present invention to provide a discontinuous modulator in which φ with respect to the '&' movement of the electric f@voltage is reduced.
小発明の構成は、入力信号を増幅17て所定副搬送波V
Cよりパルス幅変調を行いこのパルスを増幅しこの増幅
パルスを復A1〜で前記入力信号を増幅する振幅変調回
路において、前Me増幅ノ(ルスの振幅を一定に制御す
るように前記人力信号の増幅部に乗算増幅器を挿入した
ことを特徴とする。The configuration of the small invention is to amplify the input signal 17 and generate a predetermined subcarrier V.
In the amplitude modulation circuit that performs pulse width modulation from C, amplifies this pulse, and amplifies the input signal by using the amplified pulse A1~, the input signal is adjusted so that the amplitude of the pre-Me amplification pulse is controlled to be constant. The feature is that a multiplication amplifier is inserted in the amplification section.
本発明においては、第5図(blの実線の動作をパルス
電力増幅器9が行なっている場合は、振幅変調度O1(
無変調)を示すが、音声入力振幅Yの時に100−変調
するとした場合、Aの期間は破線の0〜2人まで変化す
る。In the present invention, when the pulse power amplifier 9 performs the operation shown by the solid line in FIG. 5 (bl), the amplitude modulation degree O1 (
However, if 100-modulation is performed when the audio input amplitude is Y, the period A changes from 0 to 2 people as indicated by the broken line.
この状態でDC電源人力が(l+α)に変動した場合、
DC帰還のため第5図fblのように無変調時ON周期
となるAがA/(1+α)となる必要があり、このよう
にすることrCより1)(I”出力はX一定となる。こ
のDCil源入力の変動があったr(もかかわらず音声
入力振幅Yを変化させないようにするため、パルス幅を
十A変化させることとなるため100%以上の変調とな
ってしまう。こtlを100チない。本発明では、この
振幅制御を乗算増幅器を用いて行ない、その出力を一百
1−倍にすむばよい。If the DC power source power fluctuates to (l+α) in this state,
For DC feedback, A, which is the ON period when no modulation is performed, must be A/(1+α) as shown in FIG. There is a fluctuation in this DCil source input (Nevertheless, in order to prevent the audio input amplitude Y from changing, the pulse width has to be changed by 10 A, resulting in a modulation of more than 100%. In the present invention, this amplitude control is performed using a multiplication amplifier, and the output can be increased by a factor of 101.
(実際は割算として使用、音声増幅器2の出力分母入力
として、音声増幅器6の出力は分子人力に人fることと
なる)。(Actually, it is used as a division, and as the output denominator input of the audio amplifier 2, the output of the audio amplifier 6 becomes the numerator power).
次に図面により本発明の詳細な説明する。 Next, the present invention will be explained in detail with reference to the drawings.
第1図は本発明の第一の実施例を含む送信機のブロック
図でおる。本実施例は、音声入力端子lからの音声入力
を増幅する音声増幅器2と、乗算増幅器13と、音響入
力と帰還入力を増幅する音声増幅器3と、パルス幅変調
のための副搬送波発掘器7と、パルス幅変調にする比較
器4と、この出力全増幅するパルス増幅器5と、DC電
源を入力端子8から供給されるパルス電力増幅器9と、
ノ(ルス幅変調波を復調する低域通過フィルタlOと、
振幅変調出力を出力端子12から出力する高周波増幅器
11と、振幅変調出力端子12と、低減速過フィルタ1
0より取出した帰還1g号を増幅する音声増幅′a6と
を含んで構成さむる。FIG. 1 is a block diagram of a transmitter including a first embodiment of the present invention. This embodiment includes an audio amplifier 2 for amplifying the audio input from the audio input terminal l, a multiplier amplifier 13, an audio amplifier 3 for amplifying the audio input and feedback input, and a subcarrier excavator 7 for pulse width modulation. , a comparator 4 that performs pulse width modulation, a pulse amplifier 5 that fully amplifies this output, and a pulse power amplifier 9 that receives DC power from an input terminal 8.
(a low-pass filter lO that demodulates the pulse width modulated wave;
A high frequency amplifier 11 that outputs an amplitude modulated output from an output terminal 12, an amplitude modulated output terminal 12, and a low deceleration filter 1.
It includes an audio amplifier 'a6 which amplifies the feedback number 1g taken out from 0.
DC電源入力端子8のD C変動は、低域通過フィルタ
10からのDC帰還により、音声増幅器6會通り音声増
幅器3により補償さ扛、パルス幅増幅器9のDC出力を
一定に保つ。また、このDC帰還は、乗算増幅器13に
供給され、このDC@還量で音声増幅度ヶ可変し、この
変化分の増幅度を補償するため、絶えず変調感度が一定
に保た扛、歪の少ない振@変調が可能となる。DC fluctuations at the DC power input terminal 8 are compensated for by the audio amplifier 3 through the audio amplifier 6 through DC feedback from the low-pass filter 10, keeping the DC output of the pulse width amplifier 9 constant. In addition, this DC feedback is supplied to the multiplier amplifier 13, and the audio amplification degree is varied by this DC@feedback amount, and in order to compensate for this change in amplification degree, the modulation sensitivity is constantly kept constant. Less vibration@modulation is possible.
第2図は本発明の第二の実施例のブロック図である。こ
の実施例は、第1の実施例と構成が同じであるが、音声
増幅器6からの帰還出力としてI)C帰還と音声帰還と
に分けてそrtぞ扛に制御信号を出力している。こ扛は
、DC出力変動ケより補償するためにDC帰還:lを多
量に掛ける必要があるような場合に適している。FIG. 2 is a block diagram of a second embodiment of the invention. This embodiment has the same configuration as the first embodiment, but the feedback output from the audio amplifier 6 is divided into I)C feedback and audio feedback, and control signals are output to each of them. This method is suitable for cases where it is necessary to multiply the DC feedback by a large amount to compensate for DC output fluctuations.
第3図は本発明の第3の実施例のブロック図である。こ
の実施例は、第2の実施例の帰還の取り出しを最終出力
となる高周波増幅器11の出力か6一
ら取り出し、復調器14を介して音声に復調し帰還用音
声増幅器6 VC供給している。この実施例の場合、高
周波増幅器11の歪めるいF′i温度特性をも補償出来
るようになる。FIG. 3 is a block diagram of a third embodiment of the present invention. In this embodiment, the feedback of the second embodiment is extracted from the output of the high frequency amplifier 11 which is the final output, demodulated to audio via the demodulator 14, and the VC is supplied to the feedback audio amplifier 6. . In the case of this embodiment, it becomes possible to compensate for the distorted F'i temperature characteristics of the high frequency amplifier 11.
本発明は、以上説明したように、音声増幅器に乗算増幅
器を用いることにより、DC電圧賀勤に対し出力1u力
全安定にすると共に、変調出力の歪を低域させる効果が
おる。As explained above, the present invention has the effect of making the output fully stable at 1 u with respect to DC voltage fluctuations and lowering the distortion of the modulated output by using a multiplier for the audio amplifier.
第1図、第2図、第3図は本発明の第1.第2および第
3の実施例含金む送信機のブロック図、纂4図は従来の
パルス変調を用いた中波送信機の一例のブロック図、第
5図ial 、 (blU第4図の動作を説明する波形
図である。
l・・・・・・音声入力端子、2,3,6・・・・・・
音声増幅器、4・・・・・・比較器、5・・・・・・パ
ルス幅増幅器、7・・・・・・副搬送波発振器、8・・
・・・・DC電源入力端子、9・・・・・・パルス電力
増幅器、10・・・・・・低域通過フィルタ(T、PF
)、11・・・・・・高周波増幅器、12・山・・振幅
変調出力端子、13・・・・・・乗算増幅器、14・山
・・復調器。FIGS. 1, 2, and 3 illustrate the first embodiment of the present invention. A block diagram of a transmitter including the second and third embodiments; Figure 4 is a block diagram of an example of a medium wave transmitter using conventional pulse modulation; Figure 5 is a block diagram of an example of a medium wave transmitter using conventional pulse modulation; It is a waveform diagram explaining 1...Audio input terminal, 2, 3, 6...
Audio amplifier, 4...Comparator, 5...Pulse width amplifier, 7...Subcarrier oscillator, 8...
...DC power input terminal, 9...Pulse power amplifier, 10...Low pass filter (T, PF
), 11... High frequency amplifier, 12... Amplitude modulation output terminal, 13... Multiplication amplifier, 14... Peak... Demodulator.
Claims (1)
行いこのパルスを増幅しこの増幅パルスを復調して前記
入力信号を増幅する振幅変調回路において、前記増幅パ
ルスの振幅を一定に制御するように前記入力信号の増幅
部に乗算増幅器を挿入したことを特徴とする振幅変調回
路。In an amplitude modulation circuit that amplifies an input signal, performs pulse width modulation using a predetermined subcarrier, amplifies this pulse, and demodulates this amplified pulse to amplify the input signal, the amplitude of the amplified pulse is controlled to be constant. An amplitude modulation circuit characterized in that a multiplication amplifier is inserted in the input signal amplification section.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60184716A JPS6243907A (en) | 1985-08-21 | 1985-08-21 | Amplitude modulation circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60184716A JPS6243907A (en) | 1985-08-21 | 1985-08-21 | Amplitude modulation circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6243907A true JPS6243907A (en) | 1987-02-25 |
JPH0548963B2 JPH0548963B2 (en) | 1993-07-23 |
Family
ID=16158112
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP60184716A Granted JPS6243907A (en) | 1985-08-21 | 1985-08-21 | Amplitude modulation circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6243907A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006174418A (en) * | 2004-12-17 | 2006-06-29 | Andrew Corp | Transmitter with envelope tracking power amplifier utilizing digital predistortion of signal envelope |
-
1985
- 1985-08-21 JP JP60184716A patent/JPS6243907A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006174418A (en) * | 2004-12-17 | 2006-06-29 | Andrew Corp | Transmitter with envelope tracking power amplifier utilizing digital predistortion of signal envelope |
Also Published As
Publication number | Publication date |
---|---|
JPH0548963B2 (en) | 1993-07-23 |
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