JP2993266B2 - Amplitude modulator - Google Patents

Amplitude modulator

Info

Publication number
JP2993266B2
JP2993266B2 JP4065578A JP6557892A JP2993266B2 JP 2993266 B2 JP2993266 B2 JP 2993266B2 JP 4065578 A JP4065578 A JP 4065578A JP 6557892 A JP6557892 A JP 6557892A JP 2993266 B2 JP2993266 B2 JP 2993266B2
Authority
JP
Japan
Prior art keywords
signal
input terminal
amplitude
amplitude modulator
carrier 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 - Fee Related
Application number
JP4065578A
Other languages
Japanese (ja)
Other versions
JPH05275933A (en
Inventor
明洋 桐沢
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 JP4065578A priority Critical patent/JP2993266B2/en
Publication of JPH05275933A publication Critical patent/JPH05275933A/en
Application granted granted Critical
Publication of JP2993266B2 publication Critical patent/JP2993266B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【産業上の利用分野】本発明は振幅変調器に関し、特に
ディジタル化された変調信号を入力して、比較的に周波
数の低い搬送波を振幅変調する振幅変調器に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an amplitude modulator, and more particularly to an amplitude modulator which receives a digitized modulated signal and modulates the amplitude of a carrier having a relatively low frequency.

【0002】[0002]

【従来の技術】従来のこの種の振幅変調器は、図2に示
すように、まず、ディジタル化された変調信号SdをD
−A変換回路21によってアナログ変調信号Saに変換
する。その後、変調回路22において、搬送波発生回路
12からの搬送波信号Scとアナログ変調信号Saとを
混合することにより振幅変調搬送波信号Soを生成して
いる。
2. Description of the Related Art In a conventional amplitude modulator of this type, as shown in FIG.
The signal is converted into an analog modulation signal Sa by the -A conversion circuit 21. Thereafter, the modulation circuit 22 generates the amplitude-modulated carrier signal So by mixing the carrier signal Sc from the carrier generation circuit 12 and the analog modulation signal Sa.

【0003】[0003]

【発明が解決しようとする課題】上述したように従来
は、ディジタル化された変調信号をD−A変換回路によ
って一旦アナログ変調信号に変換している。このため、
回路構成が複雑化するという問題点を有している。
As described above, conventionally, a digitized modulated signal is once converted into an analog modulated signal by a DA converter. For this reason,
There is a problem that the circuit configuration is complicated.

【0004】本発明の目的は、ディジタル化された変調
信号をアナログ信号に変換することなく振幅変調搬送波
信号を生成でき、回路構成を簡素化できる振幅変調器を
提供することにある。
An object of the present invention is to provide an amplitude modulator that can generate an amplitude-modulated carrier signal without converting a digitized modulation signal into an analog signal and can simplify a circuit configuration.

【0005】[0005]

【課題を解決するための手段】本発明の振幅変調器は、
ディジタル化された変調信号を入力して搬送波信号を振
幅変調する振幅変調器において、前記ディジタル化され
た変調信号の入力端子およびアナログ出力信号の最大出
力値を設定するための基準電圧入力端子を有するD−A
変換回路を備え、前記基準電圧入力端子に前記搬送波信
号を供給して構成される。
An amplitude modulator according to the present invention comprises:
An amplitude modulator for inputting a digitized modulation signal and modulating the amplitude of a carrier signal has an input terminal for the digitized modulation signal and a reference voltage input terminal for setting a maximum output value of an analog output signal. DA
A conversion circuit configured to supply the carrier signal to the reference voltage input terminal.

【0006】[0006]

【実施例】次に本発明について図面を参照して説明す
る。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

【0007】図1は本発明の一実施例を示すブロック図
であり、ディジタル化された変調信号Sdおよび搬送波
信号Scを受けて振幅変調搬送波信号Soを出力するD
−A変換回路11を備えている。ここで、D−A変換回
路11は、ディジタル化された変調信号Sdの入力端子
101と、基準電圧入力端子102と、出力端子103
とを有している。
FIG. 1 is a block diagram showing an embodiment of the present invention, which receives a digitized modulated signal Sd and a carrier signal Sc and outputs an amplitude-modulated carrier signal So.
It has an -A conversion circuit 11. Here, the DA converter 11 includes an input terminal 101 for the digitized modulated signal Sd, a reference voltage input terminal 102, and an output terminal 103.
And

【0008】ところで、基準電圧入力端子102に印加
する電圧に応じて、出力端子103から出力されるアナ
ログ信号の最大出力値が設定される。従って、この基準
電圧入力端子102に、搬送波発生回路12からの搬送
波信号Scを供給することにより、出力端子103から
出力される搬送波信号の振幅は、変調信号Sdがアナロ
グ化される信号の大きさに応じて変化するので、結局、
振幅変調搬送波信号Soが得られる。
The maximum output value of the analog signal output from the output terminal 103 is set according to the voltage applied to the reference voltage input terminal 102. Accordingly, by supplying the carrier signal Sc from the carrier generation circuit 12 to the reference voltage input terminal 102, the amplitude of the carrier signal output from the output terminal 103 is equal to the magnitude of the signal from which the modulation signal Sd is converted into an analog signal. Changes depending on
An amplitude modulated carrier signal So is obtained.

【0009】[0009]

【発明の効果】以上説明したように本発明によれば、D
−A変換回路の入力端子にディジタル化された変調信号
を供給し、また、基準電圧入力端子に搬送波信号を供給
することにより、出力端子から振幅変調搬送波信号が得
られるので、非常に単純な回路構成となる。
As described above, according to the present invention, D
By supplying a digitized modulation signal to the input terminal of the -A conversion circuit and supplying a carrier signal to the reference voltage input terminal, an amplitude-modulated carrier signal can be obtained from the output terminal. Configuration.

【0010】特に、ディジタルフィルタ等のディジタル
処理された信号を変調する場合には、アナログ信号部分
の回路規模を小さくでき、回路構成簡素化の効果が大き
い。
In particular, when modulating a digitally processed signal such as a digital filter, the circuit scale of the analog signal portion can be reduced, and the effect of simplifying the circuit configuration is great.

【図面の簡単な説明】[Brief description of the 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 one embodiment of the present invention.

【図2】従来の振幅変調器の一例を示すブロック図であ
る。
FIG. 2 is a block diagram illustrating an example of a conventional amplitude modulator.

【符号の説明】[Explanation of symbols]

11 D−A変換回路 Sd ディジタル化された変調信号 Sc 搬送波信号 So 振幅変調搬送波信号 101 入力端子 102 基準電圧入力端子 11 DA converter circuit Sd Digitized modulation signal Sc Carrier signal So Amplitude modulation carrier signal 101 Input terminal 102 Reference voltage input terminal

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 ディジタル化された変調信号を入力して
搬送波信号を振幅変調する振幅変調器において、前記デ
ィジタル化された変調信号の入力端子およびアナログ出
力信号の最大出力値を設定するための基準電圧入力端子
を有するD−A変換回路を備え、前記基準電圧入力端子
に前記搬送波信号を供給することを特徴とする振幅変調
器。
1. A reference for setting an input terminal of the digitized modulation signal and a maximum output value of an analog output signal in an amplitude modulator that inputs a digitized modulation signal and amplitude-modulates a carrier signal. An amplitude modulator comprising: a DA converter having a voltage input terminal; and supplying the carrier signal to the reference voltage input terminal.
JP4065578A 1992-03-24 1992-03-24 Amplitude modulator Expired - Fee Related JP2993266B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4065578A JP2993266B2 (en) 1992-03-24 1992-03-24 Amplitude modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4065578A JP2993266B2 (en) 1992-03-24 1992-03-24 Amplitude modulator

Publications (2)

Publication Number Publication Date
JPH05275933A JPH05275933A (en) 1993-10-22
JP2993266B2 true JP2993266B2 (en) 1999-12-20

Family

ID=13291032

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4065578A Expired - Fee Related JP2993266B2 (en) 1992-03-24 1992-03-24 Amplitude modulator

Country Status (1)

Country Link
JP (1) JP2993266B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5714917A (en) * 1996-10-02 1998-02-03 Nokia Mobile Phones Limited Device incorporating a tunable thin film bulk acoustic resonator for performing amplitude and phase modulation

Also Published As

Publication number Publication date
JPH05275933A (en) 1993-10-22

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Effective date: 19990921

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