JPH0249216U - - Google Patents
Info
- Publication number
- JPH0249216U JPH0249216U JP12826488U JP12826488U JPH0249216U JP H0249216 U JPH0249216 U JP H0249216U JP 12826488 U JP12826488 U JP 12826488U JP 12826488 U JP12826488 U JP 12826488U JP H0249216 U JPH0249216 U JP H0249216U
- Authority
- JP
- Japan
- Prior art keywords
- emitter
- transistor
- gain control
- collector
- current
- 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
- 230000003321 amplification Effects 0.000 claims 1
- 230000002238 attenuated effect Effects 0.000 claims 1
- 238000003199 nucleic acid amplification method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
Landscapes
- Television Receiver Circuits (AREA)
- Attenuators (AREA)
- Control Of Amplification And Gain Control (AREA)
Description
第１図はこの考案の一実施例の構成を示す回路
図、第２図はこの考案の他の実施例の構成を示す
回路図でａ，ｂは各々、リバースＡＧＣの場合お
よびトランジスタＰＮＰの場合、第３図はトラン
ジスタの特性図、第４図はＰＩＮダイオードを減
衰器として使用した従来例の構成を示す回路図、
第５図は電流制限回路を付加した従来例の構成を
示す回路図である。
１……入力端子、２……出力端子、３ａ〜ｃ…
…直流阻止コンデンサ、４……チヨークコイル、
５……ＰＩＮダイオード、６……トランジスタ、
７……エミツタ抵抗、８……ベース抵抗、１４…
…コレクタ抵抗。
Figure 1 is a circuit diagram showing the configuration of one embodiment of this invention, and Figure 2 is a circuit diagram showing the configuration of another embodiment of this invention, where a and b are for reverse AGC and transistor PNP, respectively. , Fig. 3 is a characteristic diagram of the transistor, Fig. 4 is a circuit diagram showing the configuration of a conventional example using a PIN diode as an attenuator,
FIG. 5 is a circuit diagram showing the configuration of a conventional example in which a current limiting circuit is added. 1...Input terminal, 2...Output terminal, 3a-c...
...DC blocking capacitor, 4...Chiyoke coil,
5...PIN diode, 6...transistor,
7... Emitter resistance, 8... Base resistance, 14...
...Collector resistance.
Claims (1)
用するとともに、利得制御信号がベースに供給さ
れるトランジスタのエミツタ電流を前記ＰＩＮダ
イオードに供給する自動利得制御回路において、
前記トランジスタのエミツタおよびコレクタに各
々接続されるエミツタ抵抗およびコレクタ抵抗を
具備するとともに、前記エミツタ電流が予め定め
られた設定値を越えると、前記トランジスタの電
流増幅率が減衰し、前記エミツタ電流が前記設定
値を保つように、前記エミツタ抵抗およびコレク
タ抵抗の各値を設定したことを特徴とする自動利
得制御回路。 In an automatic gain control circuit that uses a PIN diode as an attenuator between input and output and supplies the emitter current of a transistor to the base of which a gain control signal is supplied to the PIN diode,
An emitter resistor and a collector resistor are respectively connected to the emitter and collector of the transistor, and when the emitter current exceeds a predetermined setting value, the current amplification factor of the transistor is attenuated, and the emitter current An automatic gain control circuit characterized in that each value of the emitter resistance and the collector resistance is set so as to maintain a set value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988128264U JP2521517Y2 (en) | 1988-09-30 | 1988-09-30 | Automatic gain control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988128264U JP2521517Y2 (en) | 1988-09-30 | 1988-09-30 | Automatic gain control circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0249216U true JPH0249216U (en) | 1990-04-05 |
| JP2521517Y2 JP2521517Y2 (en) | 1996-12-25 |
Family
ID=31381439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988128264U Expired - Lifetime JP2521517Y2 (en) | 1988-09-30 | 1988-09-30 | Automatic gain control circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2521517Y2 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5510035A (en) * | 1978-07-07 | 1980-01-24 | Hitachi Ltd | Applying load in turbine power plant |
| JPS55140316A (en) * | 1979-04-19 | 1980-11-01 | Mitsubishi Electric Corp | Voltage control high frequency variable attenuation device |
| JPS5931053U (en) * | 1982-08-20 | 1984-02-27 | セイコーインスツルメンツ株式会社 | Thermal analyzer |
| JPH0292173A (en) * | 1988-09-29 | 1990-03-30 | Toshiba Corp | Antenna diversity type television receiver |
-
1988
- 1988-09-30 JP JP1988128264U patent/JP2521517Y2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5510035A (en) * | 1978-07-07 | 1980-01-24 | Hitachi Ltd | Applying load in turbine power plant |
| JPS55140316A (en) * | 1979-04-19 | 1980-11-01 | Mitsubishi Electric Corp | Voltage control high frequency variable attenuation device |
| JPS5931053U (en) * | 1982-08-20 | 1984-02-27 | セイコーインスツルメンツ株式会社 | Thermal analyzer |
| JPH0292173A (en) * | 1988-09-29 | 1990-03-30 | Toshiba Corp | Antenna diversity type television receiver |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2521517Y2 (en) | 1996-12-25 |
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