JPS63153634U - - Google Patents
Info
- Publication number
- JPS63153634U JPS63153634U JP4643287U JP4643287U JPS63153634U JP S63153634 U JPS63153634 U JP S63153634U JP 4643287 U JP4643287 U JP 4643287U JP 4643287 U JP4643287 U JP 4643287U JP S63153634 U JPS63153634 U JP S63153634U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- amplification circuit
- frequency signal
- circuit
- output
- 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
- 230000003321 amplification Effects 0.000 claims description 8
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims 2
- 238000001514 detection method Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 1
Landscapes
- Noise Elimination (AREA)
- Circuits Of Receivers In General (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Description
第１図は、本考案の一実施例によるＦＭ受信装
置の回路構成を示すブロツク図、および第２図は
、従来のＦＭ受信装置の回路構成を示すブロツク
図である。
１０……アンテナ、１２……高周波増幅回路、
１４……混合回路、１６……局部発振回路、１８
……中間周波増幅回路、３０……アナログスイツ
チ、３２……比較回路。
FIG. 1 is a block diagram showing the circuit configuration of an FM receiver according to an embodiment of the present invention, and FIG. 2 is a block diagram showing the circuit configuration of a conventional FM receiver. 10...Antenna, 12...High frequency amplification circuit,
14...Mixing circuit, 16...Local oscillation circuit, 18
. . . intermediate frequency amplification circuit, 30 . . . analog switch, 32 . . . comparison circuit.
Claims (1)
と、前記高周波増幅回路より出力された高周波信
号を中間周波信号に変換する周波数変換回路と、
前記中間周波信号を増幅する中間周波増幅回路と
、前記中間周波増幅回路より出力された中間周波
信号をＦＭ検波するＦＭ検波回路とを備えたＦＭ
受信装置において、 前記中間周波増幅回路より得られる受信電波の
強さに対応したレベルをもつ信号を基準値と比較
し、前者が後者よりも低いときは第１の論理値を
もち前者が後者よりも高いときは第２の論理値を
もつような比較出力信号を発生する比較回路と、 アンテナより供給される高周波信号を入力する
入力端子と、前記高周波信号を前記高周波増幅回
路に出力する第１の出力端子と、前記高周波信号
を前記周波数変換回路に出力する第２の出力端子
とを有し、前記比較出力信号に応答し、それが前
記第１の論理値のときは前記第１の出力端子に切
り替わり、それが前記第２の論理値のときは前記
第２の出力端子に切り替わる電子スイツチと、 を具備することを特徴とするＦＭ入力切替回路。[Claims for Utility Model Registration] A high-frequency amplification circuit that amplifies a received high-frequency signal, a frequency conversion circuit that converts the high-frequency signal output from the high-frequency amplification circuit into an intermediate frequency signal,
FM comprising: an intermediate frequency amplification circuit that amplifies the intermediate frequency signal; and an FM detection circuit that performs FM detection of the intermediate frequency signal output from the intermediate frequency amplification circuit.
In the receiving device, a signal having a level corresponding to the strength of the received radio wave obtained from the intermediate frequency amplification circuit is compared with a reference value, and when the former is lower than the latter, it has a first logical value and the former is higher than the latter. a comparison circuit that generates a comparison output signal that has a second logic value when the signal is high; an input terminal that receives a high frequency signal supplied from the antenna; and a first output terminal that outputs the high frequency signal to the high frequency amplification circuit. and a second output terminal for outputting the high frequency signal to the frequency conversion circuit, the first output terminal being responsive to the comparison output signal and when the comparison output signal is the first logic value. an electronic switch that switches to the terminal and switches to the second output terminal when it is the second logical value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4643287U JPS63153634U (en) | 1987-03-28 | 1987-03-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4643287U JPS63153634U (en) | 1987-03-28 | 1987-03-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63153634U true JPS63153634U (en) | 1988-10-07 |
Family
ID=30866090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4643287U Pending JPS63153634U (en) | 1987-03-28 | 1987-03-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63153634U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1013333A (en) * | 1996-06-26 | 1998-01-16 | Nec Corp | Mobile communication equipment |
| JP2010068529A (en) * | 1994-12-16 | 2010-03-25 | Qualcomm Inc | Method and apparatus for increasing receiver immunity to interference |
-
1987
- 1987-03-28 JP JP4643287U patent/JPS63153634U/ja active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010068529A (en) * | 1994-12-16 | 2010-03-25 | Qualcomm Inc | Method and apparatus for increasing receiver immunity to interference |
| JPH1013333A (en) * | 1996-06-26 | 1998-01-16 | Nec Corp | Mobile communication equipment |