JPH0472728U - - Google Patents
Info
- Publication number
- JPH0472728U JPH0472728U JP11630590U JP11630590U JPH0472728U JP H0472728 U JPH0472728 U JP H0472728U JP 11630590 U JP11630590 U JP 11630590U JP 11630590 U JP11630590 U JP 11630590U JP H0472728 U JPH0472728 U JP H0472728U
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- conversion circuit
- frequency conversion
- receiving device
- radio receiving
- 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 description 5
- 230000010355 oscillation Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
Landscapes
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Description
第１図は本考案の一実施例を示すブロツク図、
第２図は第１図に示す可変バンドパスフイルタの
詳細を示す回路図、第３図は従来のＡＭラジオ受
信装置の一例を示すブロツク図である。
１，４……入力回路、２……受信回路、３……
アンテナ、１１……高周波増幅回路、１２……可
変バンドパスフイルタ、１３……第１周波数変換
回路、１４……第１局部発振回路、１５……選局
回路、２１……第１中間周波バンドパスフイルタ
、２２……第２周波数変換回路、２３……第２中
間周波増幅回路、２４……検波回路、２５……ス
ピーカ、２６……第２局部発振回路、２７……ス
テーシヨンデテクタ回路。
FIG. 1 is a block diagram showing an embodiment of the present invention.
FIG. 2 is a circuit diagram showing details of the variable bandpass filter shown in FIG. 1, and FIG. 3 is a block diagram showing an example of a conventional AM radio receiving apparatus. 1, 4...Input circuit, 2...Receiving circuit, 3...
Antenna, 11... High frequency amplification circuit, 12... Variable band pass filter, 13... First frequency conversion circuit, 14... First local oscillation circuit, 15... Tuning circuit, 21... First intermediate frequency band Pass filter, 22... second frequency conversion circuit, 23... second intermediate frequency amplification circuit, 24... detection circuit, 25... speaker, 26... second local oscillation circuit, 27... station detector circuit.
Claims (1)
変換回路を有するスーパヘテロダイン方式のＡＭ
ラジオ受信装置において、 前記周波数変換回路に前置され、前記周波数変
換回路の局部発振周波数を制御する周波数制御電
圧により制御される電圧制御可変容量ダイオード
を備える中心周波数可変バンドパスフイルタを有
することを特徴とするＡＭラジオ受信装置。[Claims for Utility Model Registration] A superheterodyne AM having a frequency conversion circuit that converts a high-frequency input signal to an intermediate frequency.
The radio receiving device is characterized in that it has a variable center frequency bandpass filter that is placed in front of the frequency conversion circuit and includes a voltage-controlled variable capacitance diode that is controlled by a frequency control voltage that controls the local oscillation frequency of the frequency conversion circuit. AM radio receiving device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11630590U JPH0472728U (en) | 1990-11-06 | 1990-11-06 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11630590U JPH0472728U (en) | 1990-11-06 | 1990-11-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0472728U true JPH0472728U (en) | 1992-06-26 |
Family
ID=31864120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11630590U Pending JPH0472728U (en) | 1990-11-06 | 1990-11-06 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0472728U (en) |
-
1990
- 1990-11-06 JP JP11630590U patent/JPH0472728U/ja active Pending
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