JPS6444729U - - Google Patents
Info
- Publication number
- JPS6444729U JPS6444729U JP13953987U JP13953987U JPS6444729U JP S6444729 U JPS6444729 U JP S6444729U JP 13953987 U JP13953987 U JP 13953987U JP 13953987 U JP13953987 U JP 13953987U JP S6444729 U JPS6444729 U JP S6444729U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- intermediate frequency
- local oscillation
- switching
- signal
- 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
- 230000010355 oscillation Effects 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
Description
第１図は、本考案の一実施例の回路図、第２図
は第１図の周波数関係を示す図、第３図は従来例
の回路図、第４図は従来例の周波数関係を示す図
である。
５……混合回路、７……局部発振回路、９……
中間周波数切り換え回路。
Fig. 1 is a circuit diagram of an embodiment of the present invention, Fig. 2 is a diagram showing the frequency relationship of Fig. 1, Fig. 3 is a circuit diagram of a conventional example, and Fig. 4 is a diagram showing the frequency relationship of the conventional example. It is a diagram. 5...Mixing circuit, 7...Local oscillation circuit, 9...
Intermediate frequency switching circuit.
Claims (1)
部発振回路と、入力信号および前記局部発振回路
からの局部発振信号を混合して中間周波信号に変
換する混合回路とを備えるチユーナ回路において
、 前記局部発振回路の発振周波数を可変して前記
中間周波信号の中間周波数を、所望の中間周波数
に切り換える中間周波数切り換え回路を設けたこ
とを特徴とするチユーナ回路。 (2) 前記中間周波数切り換え回路は、前記切り
換えのための切り換え電圧によつて容量が変化す
る可変容量ダイオードと、コンデンサとの直列回
路が、前記局部発振回路に接続されたものである
前記実用新案登録請求の範囲第１項記載のチユー
ナ回路。[Claims for Utility Model Registration] (1) A local oscillation circuit whose oscillation frequency is varied according to the tuning voltage, and a mixing circuit which mixes an input signal and the local oscillation signal from the local oscillation circuit and converts it into an intermediate frequency signal. A tuner circuit comprising: an intermediate frequency switching circuit that changes the oscillation frequency of the local oscillation circuit to switch the intermediate frequency of the intermediate frequency signal to a desired intermediate frequency. (2) In the utility model, the intermediate frequency switching circuit includes a series circuit of a capacitor and a variable capacitance diode whose capacitance changes depending on the switching voltage for switching, which is connected to the local oscillation circuit. A tuner circuit according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987139539U JP2515013Y2 (en) | 1987-09-11 | 1987-09-11 | Tuner circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987139539U JP2515013Y2 (en) | 1987-09-11 | 1987-09-11 | Tuner circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6444729U true JPS6444729U (en) | 1989-03-17 |
| JP2515013Y2 JP2515013Y2 (en) | 1996-10-23 |
Family
ID=31402890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987139539U Expired - Lifetime JP2515013Y2 (en) | 1987-09-11 | 1987-09-11 | Tuner circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2515013Y2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57138440U (en) * | 1981-02-20 | 1982-08-30 | ||
| JPS61151415U (en) * | 1985-03-12 | 1986-09-19 | ||
| JPS61189636U (en) * | 1985-05-15 | 1986-11-26 |
-
1987
- 1987-09-11 JP JP1987139539U patent/JP2515013Y2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57138440U (en) * | 1981-02-20 | 1982-08-30 | ||
| JPS61151415U (en) * | 1985-03-12 | 1986-09-19 | ||
| JPS61189636U (en) * | 1985-05-15 | 1986-11-26 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2515013Y2 (en) | 1996-10-23 |