JPS6160530U - - Google Patents
Info
- Publication number
- JPS6160530U JPS6160530U JP14555384U JP14555384U JPS6160530U JP S6160530 U JPS6160530 U JP S6160530U JP 14555384 U JP14555384 U JP 14555384U JP 14555384 U JP14555384 U JP 14555384U JP S6160530 U JPS6160530 U JP S6160530U
- Authority
- JP
- Japan
- Prior art keywords
- broadcast signal
- circuit
- switching transistor
- impedance
- switching
- 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
- 239000003990 capacitor Substances 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 description 1
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Superheterodyne Receivers (AREA)
Description
図は本考案の受信機のバンド切換回路である。
２…第１フロントエンド、３…第２フロントエ
ンド、９…第１切換スイツチ、１０…選局用可変
コンデンサー、１１…アンテナ同調回路、１３…
第２切換スイツチ、１４…選局用可変コンデンサ
ー、２０…インピーダンス回路、２１…第３フロ
ントエンド、２３…周波数変換回路。
The figure shows the band switching circuit of the receiver of the present invention. 2... First front end, 3... Second front end, 9... First changeover switch, 10... Variable capacitor for tuning, 11... Antenna tuning circuit, 13...
2nd changeover switch, 14... variable capacitor for channel selection, 20... impedance circuit, 21... third front end, 23... frequency conversion circuit.
Claims (1)
フロントエンドと、テレビローチヤンネル放送信
号及びＦＭ放送信号を受信する第２フロントエン
ドと、ＡＭ放送信号を受信する第３フロントエン
ドと、前記第１、第２及び第３フロントエンドの
各電源回路に接続したスイツチングトランジスタ
と、前記フロントエンドに共用される選局用可変
コンデンサーに並列接続され直流的には低インピ
ーダンスを呈するも交流的には高インピーダンス
を呈するインピーダンス回路と、前記選局用可変
コンデンサーを切換える切換スイツチとよりなり
、切換スイツチの切換えにより前記インピーダン
ス回路を経てスイツチングトランジスタにバイア
ス電圧を供給し、該スイツチングトランジスタを
オンし所定のフロントエンドに電源電圧を供給す
ることを特徴とする受信機のバンド切換回路。 The first place to receive the TV Haiti Channel broadcast signal
a front end, a second front end that receives the TV channel broadcast signal and the FM broadcast signal, a third front end that receives the AM broadcast signal, and each power supply circuit of the first, second, and third front ends; an impedance circuit which is connected in parallel to the connected switching transistor and the variable channel selection capacitor shared by the front end and exhibits low impedance in direct current but high impedance in alternating current; and the variable channel selection capacitor. The present invention is characterized in that, by switching the changeover switch, a bias voltage is supplied to the switching transistor via the impedance circuit, and the switching transistor is turned on to supply a power supply voltage to a predetermined front end. Receiver band switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14555384U JPH021961Y2 (en) | 1984-09-26 | 1984-09-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14555384U JPH021961Y2 (en) | 1984-09-26 | 1984-09-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6160530U true JPS6160530U (en) | 1986-04-23 |
| JPH021961Y2 JPH021961Y2 (en) | 1990-01-18 |
Family
ID=30703806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14555384U Expired JPH021961Y2 (en) | 1984-09-26 | 1984-09-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH021961Y2 (en) |
-
1984
- 1984-09-26 JP JP14555384U patent/JPH021961Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH021961Y2 (en) | 1990-01-18 |