JPH0298524U - - Google Patents
Info
- Publication number
- JPH0298524U JPH0298524U JP677589U JP677589U JPH0298524U JP H0298524 U JPH0298524 U JP H0298524U JP 677589 U JP677589 U JP 677589U JP 677589 U JP677589 U JP 677589U JP H0298524 U JPH0298524 U JP H0298524U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- input
- variable capacitance
- tuning
- coupling
- 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
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000010355 oscillation Effects 0.000 claims description 3
- 230000003321 amplification Effects 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Description
第１図と第２図は本考案に係るＶＨＦチユーナ
の実施例を示すブロツク図と回路図、第３図と第
４図は従来のＶＨＦチユーナの具体例を示すブロ
ツク図と回路図である。
２２……入力回路、２３……高周波増幅回路、
２４……周波数変換段、２６，２８，３１，３４
……同調部、２９……混合回路、３０……局部発
振回路、ＶＤ５，ＶＤ７，ＶＤ８，ＶＤ９……同
調用可変容量ダイオード、ＶＤ６，ＶＤ１０……
結合用可変容量ダイオード、３５……ピーキング
回路、Ｑ６……発振素子。
1 and 2 are a block diagram and a circuit diagram showing an embodiment of a VHF tuner according to the present invention, and FIGS. 3 and 4 are a block diagram and a circuit diagram showing a specific example of a conventional VHF tuner. 22...Input circuit, 23...High frequency amplification circuit,
24...Frequency conversion stage, 26, 28, 31, 34
... Tuning section, 29 ... Mixing circuit, 30 ... Local oscillation circuit, VD 5 , VD 7 , VD 8 , VD 9 ... Tuning variable capacitance diode, VD 6 , VD 10 ...
Coupling variable capacitance diode, 35...peaking circuit, Q6 ...oscillation element.
Claims (1)
、混合回路と局部発振回路を含む周波数変換段か
ら成り、各回路の同調部に容量上に１１以上の同
調用可変容量ダイオードと各回路間に結合する結
合用可変容量ダイオードとを使用すると共に上記
混合回路の入力側にピーキング回路を具備し、上
記各同調部をＶＨＦ全帯域に亘る単一バンドで形
成したことを特徴とするＶＨＦチユーナ。 It consists of an RF input stage that includes an input circuit and a high-frequency amplification circuit, and a frequency conversion stage that includes a mixing circuit and a local oscillation circuit, and the tuning section of each circuit has 11 or more variable capacitance diodes for tuning on the capacitor and coupling between each circuit. 1. A VHF tuner characterized in that a coupling variable capacitance diode is used, a peaking circuit is provided on the input side of the mixing circuit, and each tuning section is formed in a single band covering the entire VHF band.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP677589U JPH0543543Y2 (en) | 1989-01-23 | 1989-01-23 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP677589U JPH0543543Y2 (en) | 1989-01-23 | 1989-01-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0298524U true JPH0298524U (en) | 1990-08-06 |
| JPH0543543Y2 JPH0543543Y2 (en) | 1993-11-02 |
Family
ID=31211229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP677589U Expired - Lifetime JPH0543543Y2 (en) | 1989-01-23 | 1989-01-23 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0543543Y2 (en) |
-
1989
- 1989-01-23 JP JP677589U patent/JPH0543543Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0543543Y2 (en) | 1993-11-02 |