JPH05121945A - Amplitude modulation transmitter - Google Patents

Amplitude modulation transmitter

Info

Publication number
JPH05121945A
JPH05121945A JP3279509A JP27950991A JPH05121945A JP H05121945 A JPH05121945 A JP H05121945A JP 3279509 A JP3279509 A JP 3279509A JP 27950991 A JP27950991 A JP 27950991A JP H05121945 A JPH05121945 A JP H05121945A
Authority
JP
Japan
Prior art keywords
signal
high frequency
timing pulse
carrier
control signals
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
Application number
JP3279509A
Other languages
Japanese (ja)
Other versions
JP2884853B2 (en
Inventor
Hideo Sato
秀夫 佐藤
Masato Sagawa
正人 佐川
Naoki Kobayashi
小林  直樹
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
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP3279509A priority Critical patent/JP2884853B2/en
Publication of JPH05121945A publication Critical patent/JPH05121945A/en
Application granted granted Critical
Publication of JP2884853B2 publication Critical patent/JP2884853B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Amplitude Modulation (AREA)
  • Amplifiers (AREA)
  • Transmitters (AREA)

Abstract

PURPOSE:To prevent discontinuity from being caused in a synthesis output signal of plural high frequency amplifiers. CONSTITUTION:Plural high frequency amplifiers 21-25 are respectively on/off- controlled by control signals C1-C5 to amplify a carrier signal S from a carrier oscillator 14 and to send the amplified signal to an output synthesizer 16. The output synthesizer 16 synthesizes outputs from each high frequency amplifier to generate an amplitude modulation signal. A synchronizing signal generator 15 receives the carrier signal S to generate a timing pulse P synchronously with a zero cross point of the carrier signal S. An A/D converter 11 converts an analog input signal into a multi-bit digital signal synchronously with the timing pulse P. An encoder 12 generates the control signals C1-C5 from the multi-bit digital signal. A control signal transmitter 13 latches the control signals C1-C5 upon the receipt of the timing pulse P and holds the control signals C1-C5 till a succeeding timing pulse P is inputted and sends them to the high frequency amplifiers 21-25.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は長波,中波,短波帯の振
幅変調送信機に関し、特に搬送波信号を増幅する複数の
高周波増幅器の出力を合成することにより振幅変調信号
を生成する振幅変調送信機に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a long-wave, medium-wave, and short-wave band amplitude modulation transmitter, and more particularly to an amplitude modulation transmission for generating an amplitude modulation signal by synthesizing outputs of a plurality of high frequency amplifiers for amplifying a carrier signal. Regarding the machine.

【0002】[0002]

【従来の技術】従来のこの種の振幅変調送信機は、図3
に示すように、搬送波発振器14からの搬送波信号Sを
増幅する複数の高周波増幅器21〜25を、制御信号C
1〜C5によってそれぞれオン・オフ制御し、各高周波
増幅器からの出力を出力合成器16によって合成するこ
とにより振幅変調信号を生成し送出している。なお、高
周波増幅器の台数は、生成する振幅変調信号に応じて複
数設定する。
2. Description of the Related Art A conventional amplitude modulation transmitter of this type is shown in FIG.
, A plurality of high frequency amplifiers 21 to 25 for amplifying the carrier signal S from the carrier oscillator 14 are connected to the control signal C.
On-off control is performed by each of 1 to C5, and the output from each high frequency amplifier is combined by the output combiner 16 to generate and send an amplitude modulation signal. A plurality of high frequency amplifiers are set according to the amplitude modulation signal to be generated.

【0003】ところで、制御信号C1〜C5を生成する
ために、A−D変換器11,エンコーダ12,制御信号
送出器13およびクロック発生器17を設けている。A
−D変換器11は、クロック発生器17からのクロック
Kに同期して、アナログ入力信号を多ビットディジタル
信号に変換する。エンコーダ12は、多ビットディジタ
ル信号から高周波増幅器21〜25をそれぞれオン・オ
フ制御するための制御信号C1〜C5を生成する。制御
信号送出器13は、クロック発生器17からのクロック
Kを受けたときに制御信号C1〜C5をラッチし、次の
クロックが入力するまで制御信号C1〜C5を保持して
高周波増幅器21〜25へ送出する。
By the way, in order to generate the control signals C1 to C5, an AD converter 11, an encoder 12, a control signal transmitter 13 and a clock generator 17 are provided. A
The -D converter 11 converts the analog input signal into a multi-bit digital signal in synchronization with the clock K from the clock generator 17. The encoder 12 generates control signals C1 to C5 for turning on and off the high frequency amplifiers 21 to 25, respectively, from the multi-bit digital signal. The control signal transmitter 13 latches the control signals C1 to C5 when receiving the clock K from the clock generator 17, holds the control signals C1 to C5 until the next clock is input, and holds the high frequency amplifiers 21 to 25. Send to.

【0004】[0004]

【発明が解決しようとする課題】上述した従来の振幅変
調送信機では、搬送波発振器とクロック発生器とが互い
に独立して動作している。従って、各高周波増幅器をそ
れぞれオン・オフ制御する制御信号のタイミングと搬送
波信号Sのゼロクロス点のタイミングとが一致しない。
このため、図4に示すように、各高周波増幅器の合成出
力信号が不連続に変化するので、不要な高調波成分が発
生するばかりでなく、トランジェント電圧等が発生して
高周波増幅器の動作を不安定にするといった問題点があ
る。
In the above-described conventional amplitude modulation transmitter, the carrier wave oscillator and the clock generator operate independently of each other. Therefore, the timing of the control signal for ON / OFF controlling each high-frequency amplifier does not match the timing of the zero-cross point of the carrier signal S.
Therefore, as shown in FIG. 4, the combined output signals of the respective high-frequency amplifiers change discontinuously, so that not only unnecessary harmonic components are generated, but also transient voltage or the like is generated and the operation of the high-frequency amplifiers is disturbed. There is a problem of making it stable.

【0005】ここで、図4(a)はアナログ入力信号の
一例を示しており、この信号レベルに応じて高周波増幅
器の動作台数が変化する。例えば、信号レベルA1のと
きは高周波増幅器を1台動作させるとすれば、信号レベ
ルA2では2台の高周波増幅器を動作させる。また、図
4(b)はクロック発生器17が発生するクロックKを
示し、図4(c)は搬送波発振器14が発生する搬送波
信号Sを示している。クロックKのタイミングと搬送波
信号Sのゼロクロス点とは一致していない。図4(d)
は合成出力信号を示しており、時刻t1から時刻t2ま
では、時刻t1で設定された制御信号(1台の高周波増
幅器を動作させる制御信号)が保持送出され、時刻t2
では、2台の高周波増幅器を動作させる制御信号が送出
されるので、合成出力信号に不連続が生じる。同様に時
刻t5においても合成出力信号に不連続が生じる。
Here, FIG. 4A shows an example of an analog input signal, and the number of operating high frequency amplifiers changes according to the signal level. For example, if one high-frequency amplifier is operated at the signal level A1, two high-frequency amplifiers are operated at the signal level A2. 4B shows the clock K generated by the clock generator 17, and FIG. 4C shows the carrier signal S generated by the carrier oscillator 14. The timing of the clock K does not coincide with the zero cross point of the carrier signal S. Figure 4 (d)
Indicates a combined output signal, and from time t1 to time t2, the control signal set at time t1 (control signal for operating one high-frequency amplifier) is held and transmitted, and time t2
In this case, since the control signal for operating the two high frequency amplifiers is sent, discontinuity occurs in the combined output signal. Similarly, discontinuity occurs in the combined output signal at time t5.

【0006】本発明の目的は、複数の高周波増幅器の合
成出力信号に不連続が生じない振幅変調送信機を提供す
ることにある。
An object of the present invention is to provide an amplitude modulation transmitter in which discontinuity does not occur in a combined output signal of a plurality of high frequency amplifiers.

【0007】[0007]

【課題を解決するための手段】本発明の振幅変調送信機
は、それぞれが制御信号によりオン・オフ制御されて搬
送波信号を増幅する複数の高周波増幅器を有し、この複
数の高周波増幅器の出力を合成することにより振幅変調
信号を生成する振幅変調送信機において、前記搬送波信
号のゼロクロス点に同期するタイミングパルスを生成す
る手段と、前記タイミングパルスに同期して前記制御信
号を前記高周波増幅器へ送出する手段とを備えて構成さ
れている。
SUMMARY OF THE INVENTION An amplitude modulation transmitter according to the present invention has a plurality of high frequency amplifiers, each of which is on / off controlled by a control signal to amplify a carrier signal. In an amplitude modulation transmitter that generates an amplitude modulation signal by synthesizing, means for generating a timing pulse synchronized with a zero cross point of the carrier wave signal, and sending the control signal to the high frequency amplifier in synchronization with the timing pulse And means.

【0008】[0008]

【実施例】次に本発明について図面を参照して説明す
る。
The present invention will be described below with reference to the drawings.

【0009】図1は本発明の一実施例を示すブロック図
である。ここで、複数の高周波増幅器21〜25は、制
御信号C1〜C5によってそれぞれオン・オフ制御さ
れ、オン状態のときは搬送波発振器14からの搬送波信
号Sを増幅して出力合成器16へ送出する。出力合成器
16は、各高周波増幅器からの出力を合成して振幅変調
信号を生成する。
FIG. 1 is a block diagram showing an embodiment of the present invention. Here, the plurality of high-frequency amplifiers 21 to 25 are on / off controlled by the control signals C1 to C5, respectively, and when in the on state, amplify the carrier signal S from the carrier oscillator 14 and send it to the output synthesizer 16. The output combiner 16 combines the outputs from the high frequency amplifiers to generate an amplitude modulation signal.

【0010】ところで、同期信号発生器15は、搬送波
発振器14からの搬送波信号Sを受けて搬送波信号Sの
ゼロクロス点を検出し、このゼロクロス点に同期するタ
イミングパルスPを発生する。
By the way, the synchronizing signal generator 15 receives the carrier signal S from the carrier oscillator 14, detects a zero-cross point of the carrier signal S, and generates a timing pulse P synchronized with the zero-cross point.

【0011】A−D変換器11は、タイミングパルスP
に同期して、アナログ入力信号を多ビットディジタル信
号に変換する。エンコーダ12は、多ビットディジタル
信号から高周波増幅器21〜25をそれぞれオン・オフ
制御するための制御信号C1〜C5を生成する。制御信
号送出器13は、タイミングパルスPを受けたときに制
御信号C1〜C5をラッチし、次のタイミングパルスP
が入力するまで制御信号C1〜C5を保持して高周波増
幅器21〜25へ送出する。
The A-D converter 11 has a timing pulse P.
The analog input signal is converted into a multi-bit digital signal in synchronization with. The encoder 12 generates control signals C1 to C5 for turning on and off the high frequency amplifiers 21 to 25, respectively, from the multi-bit digital signal. When the control signal transmitter 13 receives the timing pulse P, it latches the control signals C1 to C5, and the next timing pulse P
Control signals C1 to C5 are held until they are input to the high frequency amplifiers 21 to 25.

【0012】次に、図2によって動作を説明する。Next, the operation will be described with reference to FIG.

【0013】図2(a)はアナログ入力信号の一例を示
し、信号レベルに応じて動作する高周波増幅器の台数が
変化する。図2(b)は同期信号発生器15が発生する
タイミングパルスPを示し、図2(c)は搬送波発振器
14が発生する搬送波信号Sを示しており、搬送波信号
のゼロクロス点とタイミングパルスPとが一致してい
る。図2(d)は合成出力信号を示しており、時刻t1
から時刻t2までは1台の高周波増幅器が動作し、時刻
t2から2台の高周波増幅器が動作する。この場合、時
刻t2は搬送波信号のゼロクロス点と一致しているの
で、合成出力信号は連続的に変化し、不連続は発生しな
い。
FIG. 2 (a) shows an example of an analog input signal, and the number of high frequency amplifiers operating varies depending on the signal level. FIG. 2B shows the timing pulse P generated by the synchronization signal generator 15, and FIG. 2C shows the carrier signal S generated by the carrier oscillator 14, which shows the zero cross point of the carrier signal and the timing pulse P. Are matched. FIG. 2D shows the combined output signal at time t1.
From time t2 to time t2, one high-frequency amplifier operates, and from time t2, two high-frequency amplifiers operate. In this case, since the time t2 coincides with the zero-cross point of the carrier wave signal, the combined output signal continuously changes and discontinuity does not occur.

【0014】[0014]

【発明の効果】以上説明したように本発明によれば、搬
送波信号のゼロクロス点と同期するタイミングパルスを
発生し、複数の高周波増幅器をそれぞれオン・オフ制御
する制御信号を、このタイミングパルスと同期させて送
出することにより、各高周波増幅器の合成出力信号は連
続的に変化するので、不連続による不要な高調波成分の
発生、およびトランジェント電圧等の発生を低減でき、
高周波増幅器を安定に動作させることができる。
As described above, according to the present invention, a timing pulse synchronized with a zero cross point of a carrier signal is generated, and a control signal for turning on / off each of a plurality of high frequency amplifiers is synchronized with this timing pulse. Since the combined output signal of each high-frequency amplifier changes continuously by sending it, it is possible to reduce the generation of unnecessary harmonic components due to discontinuity, the generation of transient voltage, etc.
The high frequency amplifier can be operated stably.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of the present invention.

【図2】本発明の動作を説明するための波形図である。FIG. 2 is a waveform diagram for explaining the operation of the present invention.

【図3】従来の振幅変調送信機の一例を示すブロック図
である。
FIG. 3 is a block diagram showing an example of a conventional amplitude modulation transmitter.

【図4】従来の振幅変調送信機の動作を説明するための
波形図である。
FIG. 4 is a waveform diagram for explaining the operation of a conventional amplitude modulation transmitter.

【符号の説明】[Explanation of symbols]

13 制御信号送出器 14 搬送波発振器 15 同期信号発生器 16 出力合成器 21〜25 高周波増幅器 C1〜C5 制御信号 S 搬送波信号 P タイミングパルス 13 Control signal transmitter 14 Carrier wave oscillator 15 Synchronous signal generator 16 Output synthesizer 21-25 High frequency amplifier C1-C5 Control signal S Carrier wave signal P Timing pulse

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 それぞれが制御信号によりオン・オフ制
御されて搬送波信号を増幅する複数の高周波増幅器を有
し、この複数の高周波増幅器の出力を合成することによ
り振幅変調信号を生成する振幅変調送信機において、 前記搬送波信号のゼロクロス点に同期するタイミングパ
ルスを生成する手段と、前記タイミングパルスに同期し
て前記制御信号を前記高周波増幅器へ送出する手段とを
備えることを特徴とする振幅変調送信機。
1. An amplitude-modulated transmission, which has a plurality of high-frequency amplifiers each of which is on / off controlled by a control signal and amplifies a carrier signal, and which outputs an amplitude-modulated signal by combining the outputs of the plurality of high-frequency amplifiers. And a means for generating a timing pulse synchronized with a zero-cross point of the carrier wave signal, and a means for transmitting the control signal to the high frequency amplifier in synchronization with the timing pulse. ..
JP3279509A 1991-10-25 1991-10-25 Amplitude modulation transmitter Expired - Fee Related JP2884853B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3279509A JP2884853B2 (en) 1991-10-25 1991-10-25 Amplitude modulation transmitter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3279509A JP2884853B2 (en) 1991-10-25 1991-10-25 Amplitude modulation transmitter

Publications (2)

Publication Number Publication Date
JPH05121945A true JPH05121945A (en) 1993-05-18
JP2884853B2 JP2884853B2 (en) 1999-04-19

Family

ID=17612030

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3279509A Expired - Fee Related JP2884853B2 (en) 1991-10-25 1991-10-25 Amplitude modulation transmitter

Country Status (1)

Country Link
JP (1) JP2884853B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5166494A (en) * 1990-04-24 1992-11-24 Hypertherm, Inc. Process and apparatus for reducing electrode wear in a plasma arc torch
US5396043A (en) * 1988-06-07 1995-03-07 Hypertherm, Inc. Plasma arc cutting process and apparatus using an oxygen-rich gas shield
JP2001267856A (en) * 2000-01-21 2001-09-28 Harris Corp Rf power amplifier and its improvement

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5396043A (en) * 1988-06-07 1995-03-07 Hypertherm, Inc. Plasma arc cutting process and apparatus using an oxygen-rich gas shield
US5166494A (en) * 1990-04-24 1992-11-24 Hypertherm, Inc. Process and apparatus for reducing electrode wear in a plasma arc torch
JP2001267856A (en) * 2000-01-21 2001-09-28 Harris Corp Rf power amplifier and its improvement

Also Published As

Publication number Publication date
JP2884853B2 (en) 1999-04-19

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