JPS6198008A - Automatic gain controller - Google Patents
Automatic gain controllerInfo
- Publication number
- JPS6198008A JPS6198008A JP21960284A JP21960284A JPS6198008A JP S6198008 A JPS6198008 A JP S6198008A JP 21960284 A JP21960284 A JP 21960284A JP 21960284 A JP21960284 A JP 21960284A JP S6198008 A JPS6198008 A JP S6198008A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- peak value
- frequency drift
- component
- average value
- 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.)
- Pending
Links
- 230000003321 amplification Effects 0.000 claims description 31
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 31
- 238000001514 detection method Methods 0.000 claims description 20
- 238000010586 diagram Methods 0.000 description 7
- 230000010354 integration Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、被制御信号の直流レベルが低周波ドリフトを
もつ場合でも有効な利得制御を行う自動利得制御装置に
関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an automatic gain control device that performs effective gain control even when the DC level of a controlled signal has a low frequency drift.
従来例の構成とその問題点
第１図は従来の自動利得制御装置の構成を示すブロック
図であシ、以下第１図にしたがって従来例の説明を行う
。Structure of the conventional example and its problems FIG. 1 is a block diagram showing the structure of a conventional automatic gain control device.The conventional example will be explained below with reference to FIG.
第１図において、１は可変利得増幅手段である。In FIG. 1, numeral 1 represents variable gain amplification means.
２は増幅手段であり、尖頭値検出手段３が正常に動作す
るレベルまで被制御信号を増幅する。３は尖頭値検出手
段であり被制御信号の尖頭値を検出する。４は基準電圧
発生手段である。５は差動増幅手段であり被制御信号の
尖頭値と基準電圧との差を増幅し、出力は可変利得増幅
手段１の利得制御信号とする。Reference numeral 2 denotes an amplifying means, which amplifies the controlled signal to a level at which the peak value detecting means 3 operates normally. 3 is a peak value detection means that detects the peak value of the controlled signal. 4 is a reference voltage generating means. Reference numeral 5 denotes differential amplification means which amplifies the difference between the peak value of the controlled signal and the reference voltage, and outputs a gain control signal for the variable gain amplification means 1.
以上のように構成された従来の自動利得制御装置につい
て、以下その動作説明を行う。The operation of the conventional automatic gain control device configured as described above will be explained below.
第１図に示す従来例の自動利得制御装置に第２図ａの信
号を被制御信号として入力すれば、尖頭値検出手段の出
力（以下、尖頭値信号と記す。）は第２図すで示すよう
に直流成分だけの信号となる。また基準電圧発生手段４
の出力（以下、基準値信号と記す。）を第２図すへ併記
する。これら尖頭値信号と基準値信号との差信号は一定
であり差信号が可変利得増幅手段１の利得制御信号とな
るため第２図量に示すように希望レベルの信号を得るこ
とができる。If the signal shown in FIG. 2a is input as a controlled signal to the conventional automatic gain control device shown in FIG. As already shown, the signal consists only of DC components. Also, the reference voltage generating means 4
The output (hereinafter referred to as reference value signal) is also shown in Figure 2. The difference signal between the peak value signal and the reference value signal is constant, and the difference signal becomes the gain control signal of the variable gain amplification means 1, so that a signal of a desired level can be obtained as shown in the figure 2.
しかしながら従来の自動利得制御装置には次のような問
題がある。すなわち、被制御信号が第２図量に示すよう
に低周波ドリフト成分をもつ場合、尖頭値検出手段３の
出力は第２図量に示すように低周波ドリフト成分を含み
可変利得増幅手段１の出力は第２図量に示すように低周
波ドリフト成分で振幅変調されたものとなる。従って被
制御信号を一定レベルに保つ利得制御はできない。However, the conventional automatic gain control device has the following problems. That is, when the controlled signal has a low frequency drift component as shown in the second figure, the output of the peak value detection means 3 contains a low frequency drift component as shown in the second figure, and the variable gain amplification means 1 The output is amplitude modulated by a low frequency drift component as shown in the second figure. Therefore, gain control cannot be performed to maintain the controlled signal at a constant level.
発明の目的
本発明はこのような問題点を解消するものであり、被制
御信号の尖頭値と平均値との差成分を差動増幅手段で検
出し、この差成分信号を用いて可変利得制御手段の利得
を制御することにより、被制御信号に含１れる低周波ド
リフト成分の影響を受けず、しかも安価な自動利得制御
装置を提供することを目的とする。OBJECT OF THE INVENTION The present invention solves such problems by detecting the difference component between the peak value and the average value of the controlled signal using differential amplification means, and using this difference component signal to generate a variable gain amplifier. It is an object of the present invention to provide an automatic gain control device which is not affected by low frequency drift components contained in a controlled signal and is inexpensive by controlling the gain of a control means.
発明の構成
本発明は、被制御信号の尖頭値を検出する尖頭値検出手
段と、被制御信号の平均値を検出する平均値検出手段と
、反転入力と非反転入力とをもつ差動増幅手段と、利得
を可変できる可変利得増幅手段とを有するものであり、
被制御信号を上記尖頭値検出手段と平均値検出手段とへ
供給し、平均値検出手段の出力を差動増幅手段の反転入
力へ供給し、尖頭値検出手段の出力を差動増幅手段の非
反転入力へ供給し、被制御信号の尖頭値と平均値との差
成分を差動増幅手段で検出し、この差成分の信号を用い
て可変利得増幅手段の利得を制御するものである。Structure of the Invention The present invention provides a peak value detection means for detecting a peak value of a controlled signal, an average value detection means for detecting an average value of a controlled signal, and a differential signal having an inverting input and a non-inverting input. It has an amplification means and a variable gain amplification means that can vary the gain,
The controlled signal is supplied to the peak value detection means and the average value detection means, the output of the average value detection means is supplied to the inverting input of the differential amplification means, and the output of the peak value detection means is supplied to the differential amplification means. The difference component between the peak value and the average value of the controlled signal is detected by the differential amplification means, and this difference component signal is used to control the gain of the variable gain amplification means. be.
実施例の説明
第３図は本発明における一実施例の自動利得制御装置の
プロｙり図である。１１は可変利得増幅手段である。１
２は増幅手段である。１３は尖頭値検出手段であり被制
御信号の尖頭値を検出する。DESCRIPTION OF EMBODIMENTS FIG. 3 is a schematic diagram of an automatic gain control device according to an embodiment of the present invention. 11 is a variable gain amplification means. 1
2 is an amplification means. Reference numeral 13 denotes a peak value detection means that detects the peak value of the controlled signal.
１４は平均値検出手段であり被制御信号の平均値を検出
する。ただし低周波ドリフト成分はそのまま通過できる
よう積分時定数を設定する。１６は差動増幅手段であり
被制御信号の尖頭値と平均値との差成分を検出し増幅す
るものであり、差動増幅手段１６の出力は可変利得増幅
手段１１の利得制御信号として使用する。Reference numeral 14 denotes an average value detection means for detecting the average value of the controlled signal. However, the integration time constant is set so that the low frequency drift component can pass through as is. 16 is a differential amplification means that detects and amplifies the difference component between the peak value and the average value of the controlled signal, and the output of the differential amplification means 16 is used as a gain control signal for the variable gain amplification means 11. do.
以上のように構成された本実施例の自動利得制御装置に
ついて、その動作を説明する。The operation of the automatic gain control device of this embodiment configured as described above will be explained.
第３図に示す本実施例の自動利得制御装置へ第４図量に
示す低周波ドリフト成分を含んだ信号を被制御信号とし
て入力すれば、尖頭値検出手段１３の出力（尖頭値信号
）は第４図すで示すようになる。また平均値検出手段１
４の出力（平均値信号）は第４図すに示すように低周波
ドリフト成分と等価になる。つまシ尖頭値信号と平均値
信号との差をとれば低周波ドリフト成分を抑圧できる。If a signal containing a low frequency drift component shown in FIG. 4 is inputted as a controlled signal to the automatic gain control device of this embodiment shown in FIG. ) is already shown in Figure 4. Also, the average value detection means 1
The output of No. 4 (average value signal) is equivalent to the low frequency drift component as shown in FIG. By taking the difference between the peak value signal and the average value signal, the low frequency drift component can be suppressed.
差動増幅手段１５は尖頭値信号と平均値信号との差成分
を抽出するために使用するものであり、これにより低周
波ドリフト成分を含まない利得制御信号を得ることがで
きる。従って可変利得増幅手段１１の出力は、低周波ド
リフト成分による振幅変調を受けない希望レベルの信号
（第４図量に示す）を得ることができる。The differential amplification means 15 is used to extract the difference component between the peak value signal and the average value signal, thereby making it possible to obtain a gain control signal that does not include a low frequency drift component. Therefore, the output of the variable gain amplification means 11 can be a signal at a desired level (as shown in the figure in FIG. 4) which is not subjected to amplitude modulation due to low frequency drift components.
発明の効果
本発明は、被制御信号の尖頭値を検出する尖頭値検出手
段と、被制御信号の平均値を検出する平均値検出手段と
、反転入力と非反転入力とをもつ差動増幅手段と、利得
を可変できる可変利得増幅手段を有するものであり、被
制御信号を尖頭値検出手段と平均値検出手段とへ供給し
、尖頭値検出手段の出力を差動増幅手段の非反転入力へ
供給し、平均値検出手段の出力を差動増幅手段の反転入
力へ供給することによって被制御信号の尖頭値と平均値
との差成分を上記差動増幅手段で検出し、この差成分信
号を用いて可変利得制御手段の利得を制御することによ
り被制御信号に含まれる低周波ドリフト成分の影響を受
けず、しかも安価な自動利得制御装置を提供できる。Effects of the Invention The present invention provides a peak value detecting means for detecting the peak value of a controlled signal, an average value detecting means for detecting the average value of the controlled signal, and a differential signal having an inverting input and a non-inverting input. It has an amplifying means and a variable gain amplifying means that can vary the gain, supplies the controlled signal to the peak value detecting means and the average value detecting means, and outputs the output of the peak value detecting means to the differential amplifying means. and detecting the difference component between the peak value and the average value of the controlled signal by the differential amplifying means by supplying the output of the average value detecting means to the inverting input of the differential amplifying means; By controlling the gain of the variable gain control means using this difference component signal, it is possible to provide an automatic gain control device that is not affected by the low frequency drift component contained in the controlled signal and is inexpensive.
第１図は従来の自動利得制御装置を示すプロッり図、第
２図は従来の自動利得制御装置の各ブロックの信号波形
図、第３図は本発明の一実施例による自動利得制御装置
を示すブロック図、第４図は上記実施例による自動利得
制御装置の各ブロックの信号波形図である。
１・・・・・・可変利得増幅手段、２・・・・・・増幅
手段、３・・・・・・尖頭値検出手段、４・・・・・・
基準電圧発生手段、５・・・・・・差動増幅手段、１１
・・・・・・可変利得増幅手段、１２・・・・・増幅手
段、１３・・・・・・尖頭値検出手段、１４・・・・・
・平均値検出手段、１６・・・・・・差動増幅手段。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第１
図
第２図
第３図FIG. 1 is a plot diagram showing a conventional automatic gain control device, FIG. 2 is a signal waveform diagram of each block of the conventional automatic gain control device, and FIG. 3 is a diagram showing an automatic gain control device according to an embodiment of the present invention. The block diagram shown in FIG. 4 is a signal waveform diagram of each block of the automatic gain control device according to the above embodiment. 1... Variable gain amplification means, 2... Amplification means, 3... Peak value detection means, 4...
Reference voltage generation means, 5...Differential amplification means, 11
...Variable gain amplification means, 12...Amplification means, 13...Peak value detection means, 14...
- Average value detection means, 16...Differential amplification means. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3
Claims (1)
被制御信号の平均値を検出する平均値検出手段と、反転
入力と非反転入力とをもつ差動増幅手段と、利得を可変
できる可変利得増幅手段とを有し、上記被制御信号を上
記尖頭値検出手段と平均値検出手段とへ供給し、上記尖
頭値検出手段の出力を上記差動増幅手段の非反転入力へ
供給し、上記平均値検出手段の出力を上記差動増幅手段
の反転入力へ供給して上記被制御信号の尖頭値と平均値
の差成分を差動増幅手段で検出し、この差成分の信号を
用いて上記可変利得増幅手段の利得を制御することを特
徴とする自動利得制御装置。peak value detection means for detecting the peak value of the controlled signal; average value detection means for detecting the average value of the controlled signal; differential amplification means having an inverting input and a non-inverting input; variable gain amplification means, which supplies the controlled signal to the peak value detection means and the average value detection means, and supplies the output of the peak value detection means to the non-inverting input of the differential amplification means. The output of the average value detection means is supplied to the inverting input of the differential amplification means to detect the difference component between the peak value and the average value of the controlled signal by the differential amplification means. An automatic gain control device characterized in that the gain of the variable gain amplification means is controlled using the signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21960284A JPS6198008A (en) | 1984-10-19 | 1984-10-19 | Automatic gain controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21960284A JPS6198008A (en) | 1984-10-19 | 1984-10-19 | Automatic gain controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6198008A true JPS6198008A (en) | 1986-05-16 |
Family
ID=16738101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21960284A Pending JPS6198008A (en) | 1984-10-19 | 1984-10-19 | Automatic gain controller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6198008A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014176073A (en) * | 2013-03-13 | 2014-09-22 | Nippon Telegr & Teleph Corp <Ntt> | Receiving amplification circuit |
-
1984
- 1984-10-19 JP JP21960284A patent/JPS6198008A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014176073A (en) * | 2013-03-13 | 2014-09-22 | Nippon Telegr & Teleph Corp <Ntt> | Receiving amplification circuit |
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