JPH02133034U - - Google Patents
Info
- Publication number
- JPH02133034U JPH02133034U JP1989040095U JP4009589U JPH02133034U JP H02133034 U JPH02133034 U JP H02133034U JP 1989040095 U JP1989040095 U JP 1989040095U JP 4009589 U JP4009589 U JP 4009589U JP H02133034 U JPH02133034 U JP H02133034U
- Authority
- JP
- Japan
- Prior art keywords
- receiving circuit
- dual gate
- gate
- uhf
- gain
- 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
- 230000009977 dual effect Effects 0.000 claims description 6
- 230000003321 amplification Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Control Of Amplification And Gain Control (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (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図は従来のＶＨＦとＵＨＦのテレビ放送
を受信するテレビチユーナの概略構成を示すブロ
ツク図、第３図は従来のＡＧＣ回路が設けられた
ＵＨＦ受信回路の高周波増幅段の構成を示す回路
図。
１……アンテナ入力端子、２……第１のダイオ
ード、３……ＶＨＦ受信回路、４……第２のダイ
オード、５……ＵＨＦ受信回路、２３……デユア
ル・ゲートＭＯＳ ＦＥＴ、３０……給電ライン
。
Figure 1 is a circuit diagram showing the configuration of an embodiment of this invention, Figure 2 is a block diagram showing the schematic configuration of a TV tuner that receives conventional VHF and UHF television broadcasts, and Figure 3 is a circuit diagram showing the configuration of a conventional AGC circuit. The circuit diagram which shows the structure of the high frequency amplification stage of the provided UHF receiving circuit. 1... Antenna input terminal, 2... First diode, 3... VHF receiving circuit, 4... Second diode, 5... UHF receiving circuit, 23... Dual gate MOS FET, 30... Power supply line.
Claims (1)
オードを各々介してＶＨＦ受信回路およびＵＨＦ
受信回路が接続され、前記第１および第２のダイ
オードのいずれか一方を導通状態、他方を非導通
状態にすることにより、前記アンテナ入力端を介
して供給された入力信号が前記ＶＨＦ受信回路ま
たはＵＨＦ受信回路へ択一的に供給され、さらに
前記ＵＨＦ受信回路は、その高周波増幅段の増幅
素子としてデユアル・ゲートＦＥＴが用いられ、
該デユアル・ゲートＦＥＴの第１のゲートに入力
信号が供給され、第２のゲート２に利得制御電圧
が供給されて、利得が制御されるテレビチユーナ
において、 前記ＵＨＦ受信回路のデユアル・ゲートＦＥＴ
のソースまたは第１のゲートの電位を前記第２の
ダイオードへ印加し、前記デユアル・ゲートＦＥ
Ｔの利得変化に応じて前記第２のダイオードの内
部抵抗を変化させることを特徴とするテレビチユ
ーナ。[Claims for Utility Model Registration] A VHF receiving circuit and a UHF receiving circuit are connected to a single antenna input terminal through first and second diodes, respectively.
A receiving circuit is connected, and by making one of the first and second diodes conductive and the other non-conducting, the input signal supplied via the antenna input terminal is connected to the VHF receiving circuit or is selectively supplied to a UHF receiving circuit, and further, the UHF receiving circuit uses a dual gate FET as an amplification element in its high frequency amplification stage,
In a television tuner in which the gain is controlled by supplying an input signal to a first gate of the dual gate FET and supplying a gain control voltage to a second gate 2, the dual gate FET of the UHF receiving circuit
The potential of the source or the first gate of the dual gate FE is applied to the second diode, and the dual gate FE
A television tuner characterized in that the internal resistance of the second diode is changed according to a change in the gain of T.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989040095U JPH0718192Y2 (en) | 1989-04-05 | 1989-04-05 | TV tuner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989040095U JPH0718192Y2 (en) | 1989-04-05 | 1989-04-05 | TV tuner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02133034U true JPH02133034U (en) | 1990-11-05 |
| JPH0718192Y2 JPH0718192Y2 (en) | 1995-04-26 |
Family
ID=31549584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1989040095U Expired - Lifetime JPH0718192Y2 (en) | 1989-04-05 | 1989-04-05 | TV tuner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0718192Y2 (en) |
-
1989
- 1989-04-05 JP JP1989040095U patent/JPH0718192Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0718192Y2 (en) | 1995-04-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |