JPS63159935U - - Google Patents
Info
- Publication number
- JPS63159935U JPS63159935U JP1987053121U JP5312187U JPS63159935U JP S63159935 U JPS63159935 U JP S63159935U JP 1987053121 U JP1987053121 U JP 1987053121U JP 5312187 U JP5312187 U JP 5312187U JP S63159935 U JPS63159935 U JP S63159935U
- Authority
- JP
- Japan
- Prior art keywords
- uhf
- circuit
- vhf
- switching diode
- tuning
- 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
Landscapes
- Noise Elimination (AREA)
- Superheterodyne Receivers (AREA)
Description
第１図は本考案に係る電子チユーナの実施例を
示すＵＨＦ―ＩＦ用帯域同調回路の回路図、第２
図は従来の電子チユーナの一具体例を示すＵＨＦ
―ＩＦ用帯域同調回路の回路図である。
ＵＨＦ―ＭＩＸ……ＵＨＦ混合回路、ＶＨＦ―
ＭＩＸ……ＶＨＦ混合回路、ＵＨＦ―ＩＦ増幅回
路、ＶＤ……逆バイアス状態のダイオード。
FIG. 1 is a circuit diagram of a UHF-IF band tuning circuit showing an embodiment of an electronic tuner according to the present invention, and FIG.
The figure shows a specific example of a conventional electronic tuner.
- It is a circuit diagram of an IF band tuning circuit. UHF-MIX...UHF mixing circuit, VHF-
MIX...VHF mixing circuit, UHF-IF amplifier circuit, VD...diode in reverse bias state.
Claims (1)
調回路、上記同調回路を通して供給される制御電
流により選択的にオン・オフするスイツチングダ
イオードを介してＵＨＦ―ＩＦ増幅回路を接続す
ると共に上記スイツチングダイオードとＵＨＦ―
ＩＦ増幅回路との間をＶＨＦ信号入力に接続し、
ＶＨＦ受信時にはＵＨＦ―ＩＦ増幅回路がＶＨＦ
混合回路として作用する電子チユーナにおいて、
上記帯域同調回路のスイツチングダイオード側の
同調容量を逆バイアス接続したダイオードにて構
成したことを特徴とする電子チユーナ。 A UHF-IF amplifier circuit is connected to the output of the UHF mixing circuit via a UHF-IF band tuning circuit, a switching diode that is selectively turned on and off by a control current supplied through the tuning circuit, and the switching diode is connected to the output of the UHF mixing circuit. and UHF-
Connect the IF amplifier circuit to the VHF signal input,
When receiving VHF, the UHF-IF amplifier circuit converts to VHF.
In an electronic tuner that acts as a mixing circuit,
An electronic tuner characterized in that the tuning capacitance on the switching diode side of the band tuning circuit is constituted by a diode connected with a reverse bias.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987053121U JPH0339954Y2 (en) | 1987-04-07 | 1987-04-07 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987053121U JPH0339954Y2 (en) | 1987-04-07 | 1987-04-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63159935U true JPS63159935U (en) | 1988-10-19 |
| JPH0339954Y2 JPH0339954Y2 (en) | 1991-08-22 |
Family
ID=30878898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987053121U Expired JPH0339954Y2 (en) | 1987-04-07 | 1987-04-07 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0339954Y2 (en) |
-
1987
- 1987-04-07 JP JP1987053121U patent/JPH0339954Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0339954Y2 (en) | 1991-08-22 |