JPH0292224U - - Google Patents
Info
- Publication number
- JPH0292224U JPH0292224U JP9789U JP9789U JPH0292224U JP H0292224 U JPH0292224 U JP H0292224U JP 9789 U JP9789 U JP 9789U JP 9789 U JP9789 U JP 9789U JP H0292224 U JPH0292224 U JP H0292224U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- variable capacitance
- capacitance diode
- frequency
- gain control
- 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 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims 3
- 230000005684 electric field Effects 0.000 claims 2
- 238000006243 chemical reaction Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
Landscapes
- Picture Signal Circuits (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図は第１図の一部の具体的構成の一例を
示す回路図、第３図及び第４図は第２図の動作を
説明するための特性図、第５図は従来のＡＧＣ回
路の構成を示す回路図、第６図は第５図に示すチ
ユーナの一例を示す回路図である。
４１…入力単同調回路、４２…高周波増幅回路
、４３…可変容量ダイオード回路、４４…段間複
同調回路、４５，４８…混合回路、４６…局部発
振回路、４７…ＵＩＦＢＰＦ、４９…ＶＩＦＢＰ
Ｆ、Ｄ１…可変容量ダイオード、Ｒ４，Ｒ５…抵
抗、Ｃ３…コンデンサ、Ｌ１…コイル。
Figure 1 is a circuit diagram showing the configuration of one embodiment of this invention, Figure 2 is a circuit diagram showing an example of a specific configuration of a part of Figure 1, and Figures 3 and 4 are the circuit diagrams of Figure 2. FIG. 5 is a circuit diagram showing the configuration of a conventional AGC circuit, and FIG. 6 is a circuit diagram showing an example of the tuner shown in FIG. 5. 41...Input single tuning circuit, 42...High frequency amplifier circuit, 43...Variable capacitance diode circuit, 44...Interstage double tuning circuit, 45, 48...Mixing circuit, 46...Local oscillation circuit, 47...UIFBPF, 49...VIFBP
F, D1 ...variable capacitance diode, R4 , R5 ...resistor, C3 ...capacitor, L1 ...coil.
Claims (1)
御可能な高周波増幅回路と、 この高周波増幅回路とこの高周波増幅回路から
出力される高周波信号を中間周波信号に変換する
中間周波変換回路との間に設けられ、上記利得制
御電圧により可変容量ダイオードの逆方向バイア
ス電圧を制御することにより、電界強度に応じて
利得を徐々に制御可能なる可変容量ダイオード回
路とを具備したことを特徴とする自動利得制御回
路。[Claims for Utility Model Registration] A high-frequency amplification circuit whose gain can be controlled by a gain control voltage according to electric field strength, this high-frequency amplification circuit, and an intermediate that converts the high-frequency signal output from the high-frequency amplification circuit into an intermediate frequency signal. A variable capacitance diode circuit is provided between the frequency conversion circuit and the variable capacitance diode circuit, and the gain can be gradually controlled according to the electric field strength by controlling the reverse bias voltage of the variable capacitance diode using the gain control voltage. An automatic gain control circuit featuring:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9789U JPH0292224U (en) | 1989-01-06 | 1989-01-06 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9789U JPH0292224U (en) | 1989-01-06 | 1989-01-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0292224U true JPH0292224U (en) | 1990-07-23 |
Family
ID=31198819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9789U Pending JPH0292224U (en) | 1989-01-06 | 1989-01-06 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0292224U (en) |
-
1989
- 1989-01-06 JP JP9789U patent/JPH0292224U/ja active Pending
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