JPH0563478A - Amplifier circuit - Google Patents
Amplifier circuitInfo
- Publication number
- JPH0563478A JPH0563478A JP3223797A JP22379791A JPH0563478A JP H0563478 A JPH0563478 A JP H0563478A JP 3223797 A JP3223797 A JP 3223797A JP 22379791 A JP22379791 A JP 22379791A JP H0563478 A JPH0563478 A JP H0563478A
- Authority
- JP
- Japan
- Prior art keywords
- variable attenuator
- amplifier
- control voltage
- attenuation
- input
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は増幅回路に関し、特に利
得制御を行う増幅回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an amplifier circuit, and more particularly to an amplifier circuit for gain control.
【０００２】[0002]
【従来の技術】従来の増幅回路は、図２に示すように、
入力信号を増幅する前置増幅器２と、この増幅器の出力
を入力とし制御電圧によってその減衰量を可変する第１
可変減衰器３と、この可変減衰器の減衰量を制御するレ
ベル設定回路６と、第１可変減衰器３の出力信号を増幅
する後置増幅器５とから構成されている。2. Description of the Related Art A conventional amplifier circuit, as shown in FIG.
A preamplifier 2 that amplifies an input signal, and a first that receives the output of this amplifier and changes its attenuation amount by a control voltage
It comprises a variable attenuator 3, a level setting circuit 6 for controlling the amount of attenuation of the variable attenuator, and a post-amplifier 5 for amplifying the output signal of the first variable attenuator 3.
【０００３】入力端子１より入力された高周波信号は、
前置増幅器２で増幅され、第１可変減衰器３に入力され
る。第１可変減衰器３は、レベル設定回路６からの制御
電圧によってその減衰量を可変し、増幅器全体の利得を
決めている。第１可変減衰器３からの信号は、後置増幅
器５で増幅され、出力端子８より出力される。The high frequency signal input from the input terminal 1 is
It is amplified by the preamplifier 2 and input to the first variable attenuator 3. The first variable attenuator 3 changes the amount of attenuation according to the control voltage from the level setting circuit 6 to determine the gain of the entire amplifier. The signal from the first variable attenuator 3 is amplified by the post amplifier 5 and output from the output terminal 8.
【０００４】[0004]
【発明が解決しようとする課題】この従来の高周波信号
を増幅する増幅回路では、可変減衰器はピンダイオード
で構成されることが多い。この場合、レベル設定回路か
らの制御電圧によって可変減衰器の減衰量を設定してい
るが、図３に示すように、制御電圧に対する減衰量の変
化はその可変範囲の上限または下限に近づくにつれて直
線性が失われ、傾きが一定でなくなる。これにより増幅
器の利得を可変範囲内で設定したとき、レベル設定回路
からの制御電圧が大きいところでは利得の変化幅が小さ
く、制御電圧が小さいところでは利得の変化幅が大きく
なってしまう。In this conventional amplifier circuit for amplifying a high frequency signal, the variable attenuator is often composed of a pin diode. In this case, the amount of attenuation of the variable attenuator is set by the control voltage from the level setting circuit, but as shown in FIG. 3, the change in the amount of attenuation with respect to the control voltage is linear as the upper limit or the lower limit of the variable range is approached. Loss of sex, the slope is not constant. As a result, when the gain of the amplifier is set within the variable range, the change width of the gain is small when the control voltage from the level setting circuit is large, and the change width of the gain is large when the control voltage is small.
【０００５】従って、レベル設定回路の制御電圧に温度
補償回路を設けて制御電圧に一定の温度補償を行って
も、増幅器の利得の大きいところと小さいところでは、
温度補償による補償値が異なり温度変化に対する出力レ
ベルの安定化を図れないという欠点があった。Therefore, even if a temperature compensating circuit is provided for the control voltage of the level setting circuit to perform constant temperature compensation on the control voltage, the gain of the amplifier is large and the gain is small.
There is a drawback in that the compensation value by temperature compensation is different and the output level cannot be stabilized against temperature changes.
【０００６】[0006]
【課題を解決するための手段】本発明の増幅回路は、複
数の増幅器から成る増幅回路において、入力信号を増幅
する前置増幅器と、前記前置増幅器で増幅された信号を
入力として制御電圧によってその減衰量を可変する第１
の可変減衰器と、前記第１の可変減衰器の減衰量を制御
するレベル設定回路と、前記第１の可変減衰器の出力信
号を入力とし制御電圧によってその減衰量を可変する第
２の可変減衰器と、前記第２の可変減衰器の制御電圧を
温度によって可変して増幅回路の利得を一定に補償する
温度補償用レベル設定回路と、前記第２の可変減衰器の
出力信号を増幅する後置増幅器とを備える構成である。The amplification circuit of the present invention is an amplification circuit comprising a plurality of amplifiers, and a preamplifier for amplifying an input signal, and a signal amplified by the preamplifier as an input are controlled by a control voltage. First to change the amount of attenuation
Variable attenuator, a level setting circuit for controlling the amount of attenuation of the first variable attenuator, and a second variable for varying the amount of attenuation with a control voltage using the output signal of the first variable attenuator as an input. An attenuator, a temperature compensation level setting circuit for varying the control voltage of the second variable attenuator depending on the temperature to compensate the gain of the amplifier circuit constantly, and amplifying an output signal of the second variable attenuator. This is a configuration including a post-amplifier.
【０００７】[0007]
【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.
【０００８】図１は本発明の一実施例を示す構成図であ
る。FIG. 1 is a block diagram showing an embodiment of the present invention.
【０００９】本発明の増幅回路は、入力信号を増幅する
前置増幅器２と、前置増幅器２で増幅された信号を入力
として制御電圧によってその減衰量を可変する第１可変
減衰器３と、第１可変減衰器３の減衰量を制御するレベ
ル設定回路６と、第１可変減衰器３の出力信号を入力と
し制御電圧によってその減衰量を可変する第２可変減衰
器４と、第２可変減衰器４の制御電圧を温度によって可
変して増幅回路の利得を一定に補償する温度補償用レベ
ル設定回路７と、第２可変減衰器４の出力信号を増幅す
る後置増幅器５とを備える。The amplifier circuit according to the present invention includes a preamplifier 2 for amplifying an input signal, a first variable attenuator 3 for varying the attenuation amount by a control voltage with the signal amplified by the preamplifier 2 as an input. A level setting circuit 6 for controlling the amount of attenuation of the first variable attenuator 3, a second variable attenuator 4 for inputting an output signal of the first variable attenuator 3 and varying the amount of attenuation with a control voltage, and a second variable attenuator. A temperature compensating level setting circuit 7 for varying the control voltage of the attenuator 4 according to the temperature and compensating the gain of the amplifier circuit constantly, and a post-amplifier 5 for amplifying the output signal of the second variable attenuator 4 are provided.
【００１０】以下に動作を説明する。The operation will be described below.
【００１１】入力端子１より入力した信号は、前置増幅
器２により増幅され、第１可変減衰器３へ入力される。
ここで第１可変減衰器３はレベル設定回路６の制御電圧
により増幅器の利得を決めている。The signal input from the input terminal 1 is amplified by the preamplifier 2 and input to the first variable attenuator 3.
Here, the first variable attenuator 3 determines the gain of the amplifier by the control voltage of the level setting circuit 6.
【００１２】次に第１可変減衰器３からの出力信号は第
２可変減衰器４に入力される。第２可変減衰器４は、温
度補償用の減衰器で、温度補償用レベル設定回路７の制
御電圧により、減衰量を設定している。Next, the output signal from the first variable attenuator 3 is input to the second variable attenuator 4. The second variable attenuator 4 is an attenuator for temperature compensation, and the attenuation amount is set by the control voltage of the temperature compensation level setting circuit 7.
【００１３】この温度補償用レベル設定回路７は周囲の
温度変化によりその制御電圧を可変するものであり、図
３に示すように、この制御電圧に対する減衰量の変化が
直線性を有する部分において温度補償を行えば、第１可
変減衰器３の減衰量の設定値に無関係に、温度変化に対
して補正量の一定な温度補償ができるこのように可変減
衰器を増幅器の利得と温度補償用とに分けて構成するこ
とで、温度変化に対する増幅器の出力レベルの安定化を
図ることができる。The temperature compensating level setting circuit 7 varies the control voltage according to a change in ambient temperature. As shown in FIG. 3, the temperature is changed in a portion where the change in the attenuation amount with respect to the control voltage is linear. If the compensation is performed, the variable attenuator can be used for the gain of the amplifier and the temperature compensation regardless of the set value of the attenuation amount of the first variable attenuator 3 so that the temperature compensation can be performed with a constant correction amount with respect to the temperature change. By dividing the configuration into two, it is possible to stabilize the output level of the amplifier against temperature changes.
【００１４】[0014]
【発明の効果】以上説明したように本発明は第１の可変
減衰器の後に温度変化によってその制御電圧を可変する
温度補償用レベル設定回路と、この温度補償用レベル設
定回路からの制御電圧によってその減衰量を可変する第
２の可変減衰器とを設けて構成したので、温度補償用レ
ベル設定回路からの制御電圧に対する第２の可変減衰器
の減衰量の変化が直線性を有する部分において一定な温
度補償を行うことができる。これにより、増幅器全体の
利得を温度補償することができ、出力レベルの安定化が
図れるという効果を有する。As described above, according to the present invention, the temperature compensation level setting circuit for varying the control voltage according to the temperature change after the first variable attenuator and the control voltage from the temperature compensation level setting circuit are used. Since the second variable attenuator that varies the amount of attenuation is provided, the change of the amount of attenuation of the second variable attenuator with respect to the control voltage from the temperature compensation level setting circuit is constant in the linear portion. Temperature compensation can be performed. As a result, the gain of the entire amplifier can be temperature-compensated, and the output level can be stabilized.
【図１】本発明の一実施例を示す構成図である。FIG. 1 is a configuration diagram showing an embodiment of the present invention.
【図２】従来の増幅回路を示す構成図である。FIG. 2 is a configuration diagram showing a conventional amplifier circuit.
【図３】レベル設定回路の制御電圧に対する可変減衰器
の減衰量を表した図である。FIG. 3 is a diagram showing an attenuation amount of a variable attenuator with respect to a control voltage of a level setting circuit.
【符号の説明】 １ 入力端子 ２ 前置増幅器 ３ 第１可変減衰器 ４ 第２可変減衰器 ５ 後置増幅器 ６ レベル設定回路 ７ 温度補償用レベル設定回路 ８ 出力端子[Description of symbols] 1 input terminal 2 preamplifier 3 first variable attenuator 4 second variable attenuator 5 postamplifier 6 level setting circuit 7 temperature compensation level setting circuit 8 output terminal
Claims (1)
て、入力信号を増幅する前置増幅器と、前記前置増幅器
で増幅された信号を入力として制御電圧によってその減
衰量を可変する第１の可変減衰器と、前記第１の可変減
衰器の減衰量を制御するレベル設定回路と、前記第１の
可変減衰器の出力信号を入力とし制御電圧によってその
減衰量を可変する第２の可変減衰器と、前記第２の可変
減衰器の制御電圧を温度によって可変して増幅回路の利
得を一定に補償する温度補償用レベル設定回路と、前記
第２の可変減衰器の出力信号を増幅する後置増幅器とか
ら構成されることを特徴とする増幅回路。1. An amplifier circuit comprising a plurality of amplifiers, and a preamplifier for amplifying an input signal, and a first variable attenuation for varying the attenuation amount by a control voltage with the signal amplified by the preamplifier as an input. And a level setting circuit that controls the amount of attenuation of the first variable attenuator, and a second variable attenuator that receives the output signal of the first variable attenuator as an input and changes the amount of attenuation by a control voltage. A temperature compensating level setting circuit for varying the control voltage of the second variable attenuator according to the temperature and compensating the gain of the amplifier circuit constant, and a post-amplifier for amplifying the output signal of the second variable attenuator. An amplifier circuit comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3223797A JPH0563478A (en) | 1991-09-04 | 1991-09-04 | Amplifier circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3223797A JPH0563478A (en) | 1991-09-04 | 1991-09-04 | Amplifier circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0563478A true JPH0563478A (en) | 1993-03-12 |
Family
ID=16803873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3223797A Pending JPH0563478A (en) | 1991-09-04 | 1991-09-04 | Amplifier circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0563478A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6351911B1 (en) * | 2016-11-25 | 2018-07-04 | 三菱電機株式会社 | Output power stabilization circuit and high output amplifier using the same |
-
1991
- 1991-09-04 JP JP3223797A patent/JPH0563478A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6351911B1 (en) * | 2016-11-25 | 2018-07-04 | 三菱電機株式会社 | Output power stabilization circuit and high output amplifier using the same |
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