JPH0476738U - - Google Patents
Info
- Publication number
- JPH0476738U JPH0476738U JP12110590U JP12110590U JPH0476738U JP H0476738 U JPH0476738 U JP H0476738U JP 12110590 U JP12110590 U JP 12110590U JP 12110590 U JP12110590 U JP 12110590U JP H0476738 U JPH0476738 U JP H0476738U
- Authority
- JP
- Japan
- Prior art keywords
- conversion means
- variable attenuator
- transistor
- variable
- resistor
- 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
- 238000006243 chemical reaction Methods 0.000 claims 4
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Attenuators (AREA)
- Superheterodyne Receivers (AREA)
Description
第１図はこの考案の一実施例の構成を示すブロ
ツク図、第２図は同実施例による可変減衰器２０
の減衰特性と制御回路３０から供給される制御電
圧ＶＳとの関係構成を示すグラフ、第３図は同実
施例によるアツプコンバータの各部の温度変化に
応じた減衰特性を示すグラフ、第４図は同実施例
による制御回路３０の各部の温度変化に応じた減
衰特性を示すグラフ、第５図はＣＡＴＶ放送装置
の概略構成を示すブロツク図、第６図は従来のア
ツプコンバータの構成を示すブロツク図である。
５……サーミスタ、７……第１ミキサ、１３…
…第２ミキサ、２０……可変減衰器、２１，２２
，２３……ＰＩＮダイドード、３０……制御回路
、３１……可変抵抗器、３２……トランジスタ、
３４……ダイオード。
FIG. 1 is a block diagram showing the configuration of an embodiment of this invention, and FIG. 2 is a variable attenuator 20 according to the same embodiment.
FIG. 3 is a graph showing the relationship between the attenuation characteristic and the control voltage VS supplied from the control circuit 30. FIG. A graph showing attenuation characteristics according to temperature changes of each part of the control circuit 30 according to the same embodiment, FIG. 5 is a block diagram showing a schematic configuration of a CATV broadcasting device, and FIG. 6 is a block diagram showing the configuration of a conventional up converter. It is. 5... Thermistor, 7... First mixer, 13...
...Second mixer, 20...Variable attenuator, 21, 22
, 23... PIN diode, 30... control circuit, 31... variable resistor, 32... transistor,
34...Diode.
Claims (1)
定周波数に変換した後、第２の変換手段で各放送
チヤンネルに対応した周波数の高周波信号に変換
して出力するＣＡＴＶ放送装置におけるアツプコ
ンバータにおいて、 前記第１の変換手段の前段に直列に挿入された
サーミスタと、 前記第２の変換手段の後段に挿入された可変減
衰器と、 前記可変減衰器の減衰量を制御する制御回路と
を具備し、 前記可変減衰器はＰＩＮダイオードによつて構
成され、 前記制御回路は、電源と接地間に可変抵抗器の
抵抗体と所定の温度特性を有するダイオードとを
直列に介装し、前記可変抵抗器の摺動端子に所定
の温度特性を有するトランジスタのベースを接続
し、該トランジスタのコレクタを電源に接続し、
該トランジスタのエミツタ電圧を制御電圧として
前記可変減衰器に供給することを特徴とするＣＡ
ＴＶ放送装置におけるアツプコンバータ。[Claims for Utility Model Registration] After the input intermediate frequency signal is converted to a specific frequency by the first conversion means, it is converted to a high frequency signal of a frequency corresponding to each broadcast channel by the second conversion means and output. An up converter in a CATV broadcasting device includes: a thermistor inserted in series before the first conversion means; a variable attenuator inserted after the second conversion means; and an attenuation amount of the variable attenuator. The variable attenuator is configured with a PIN diode, and the control circuit connects a resistor of the variable resistor and a diode having predetermined temperature characteristics in series between the power supply and ground. a base of a transistor having predetermined temperature characteristics is connected to the sliding terminal of the variable resistor, and a collector of the transistor is connected to a power source;
A CA characterized in that the emitter voltage of the transistor is supplied to the variable attenuator as a control voltage.
Up converter in TV broadcast equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12110590U JPH0476738U (en) | 1990-11-19 | 1990-11-19 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12110590U JPH0476738U (en) | 1990-11-19 | 1990-11-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0476738U true JPH0476738U (en) | 1992-07-03 |
Family
ID=31868981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12110590U Pending JPH0476738U (en) | 1990-11-19 | 1990-11-19 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0476738U (en) |
-
1990
- 1990-11-19 JP JP12110590U patent/JPH0476738U/ja active Pending
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