JPH0273851U - - Google Patents
Info
- Publication number
- JPH0273851U JPH0273851U JP15330288U JP15330288U JPH0273851U JP H0273851 U JPH0273851 U JP H0273851U JP 15330288 U JP15330288 U JP 15330288U JP 15330288 U JP15330288 U JP 15330288U JP H0273851 U JPH0273851 U JP H0273851U
- Authority
- JP
- Japan
- Prior art keywords
- mixer
- voltage controlled
- intermediate frequency
- controlled oscillator
- fsk
- 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
- 239000013078 crystal Substances 0.000 claims description 3
- 230000010355 oscillation Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 1
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Description
第１図は本考案の一実施例を示すブロツク図、
第２図は従来例を示すブロツク図である。
１……入力端子、２……水晶発振器、３……中
間周波増幅器、４……デイスクリミネータ、５…
…電圧制御発振器（ＶＣＯ）、６……ミキサー、
７……低域ろ波器、８……中間周波狭帯域フイル
タ、９……波形整形回路、１０……第１の分周器
、１１……第２の分周器、１２……基準水晶発振
器、１３……位相比較器、１４……ローパスフイ
ルタ、１５……出力端子。
FIG. 1 is a block diagram showing an embodiment of the present invention.
FIG. 2 is a block diagram showing a conventional example. 1...Input terminal, 2...Crystal oscillator, 3...Intermediate frequency amplifier, 4...Discriminator, 5...
... Voltage controlled oscillator (VCO), 6... Mixer,
7...Low pass filter, 8...Intermediate frequency narrow band filter, 9...Waveform shaping circuit, 10...First frequency divider, 11...Second frequency divider, 12...Reference crystal Oscillator, 13... Phase comparator, 14... Low pass filter, 15... Output terminal.
Claims (1)
と、該ミキサーに局部発振信号を入力させる電圧
制御発振器と、前記変換された中間周波数と基準
水晶発振周波数の誤差出力を得て前記電圧制御発
振器を制御させる帰還ループとを有することを特
徴とするＦＳＫ復調回路。 A mixer that converts an FSK modulated wave into an intermediate frequency, a voltage controlled oscillator that inputs a local oscillation signal to the mixer, and an error output between the converted intermediate frequency and a reference crystal oscillation frequency that is obtained to control the voltage controlled oscillator. An FSK demodulation circuit comprising a feedback loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15330288U JPH0273851U (en) | 1988-11-25 | 1988-11-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15330288U JPH0273851U (en) | 1988-11-25 | 1988-11-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0273851U true JPH0273851U (en) | 1990-06-06 |
Family
ID=31429018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15330288U Pending JPH0273851U (en) | 1988-11-25 | 1988-11-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0273851U (en) |
-
1988
- 1988-11-25 JP JP15330288U patent/JPH0273851U/ja active Pending