JPH03432U - - Google Patents
Info
- Publication number
- JPH03432U JPH03432U JP5994489U JP5994489U JPH03432U JP H03432 U JPH03432 U JP H03432U JP 5994489 U JP5994489 U JP 5994489U JP 5994489 U JP5994489 U JP 5994489U JP H03432 U JPH03432 U JP H03432U
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- diode
- comparator
- circuit
- output terminal
- 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
- 238000010586 diagram Methods 0.000 description 10
Description
第１図は衛星放送受信機のＡＦＴ回路を示す要
部ブロツク図、第２図は本考案の実施例を示す回
路構成図、第３図は本考案の実施例を示すコンパ
レータ回路図および動作説明図、第４図は本考案
の実施例を示す他のコンパレータ回路図および動
作説明図、第５図は本考案のＡＦＴ回路の動作説
明図、第６図は従来例を示すＡＦＴ回路の概略図
、第７図は第６図のＡＦＴ回路に使用している従
来例を示すコンパレータ回路図および動作説明図
、第８図は従来例のＡＦＴ回路の動作説明図であ
る。
１，１０……入力端子、２……高周波増幅器、
３……混合器、４……第２中間周波増幅器、５…
…バンドパスフイルタ、６……ＦＭ復調器、７…
…ＡＦＴ回路、８……マイコン、９……局部発振
器、１１，１７，１９，２５，２７，２８……抵
抗器、１４……可変抵抗器、１２……オペアンプ
、１３，２１，２６……電源、１５，２２……コ
ンパレータ、１８，２０，２３，２４……ダイオ
ード、２９……マイコン。
Fig. 1 is a main block diagram showing the AFT circuit of a satellite broadcasting receiver, Fig. 2 is a circuit configuration diagram showing an embodiment of the present invention, and Fig. 3 is a comparator circuit diagram and operation explanation showing an embodiment of the present invention. Fig. 4 is another comparator circuit diagram and operation explanatory diagram showing an embodiment of the present invention, Fig. 5 is an operation explanatory diagram of the AFT circuit of the present invention, and Fig. 6 is a schematic diagram of an AFT circuit showing a conventional example. , FIG. 7 is a comparator circuit diagram and operation explanation diagram showing a conventional example used in the AFT circuit of FIG. 6, and FIG. 8 is an operation explanation diagram of the conventional example AFT circuit. 1, 10...Input terminal, 2...High frequency amplifier,
3...Mixer, 4...Second intermediate frequency amplifier, 5...
...Bandpass filter, 6...FM demodulator, 7...
...AFT circuit, 8 ... Microcomputer, 9 ... Local oscillator, 11, 17, 19, 25, 27, 28 ... Resistor, 14 ... Variable resistor, 12 ... Operational amplifier, 13, 21, 26 ... Power supply, 15, 22... Comparator, 18, 20, 23, 24... Diode, 29... Microcomputer.
Claims (1)
ースとを第１の抵抗で接続し、同入力ピンと比較
基準電圧源とを第２の抵抗および第３の抵抗で直
列に接続した回路において、同コンパレータの出
力端子にダイオードの一端を接続し、同ダイオー
ドの他端を前記第２の抵抗と第３の抵抗の中間に
接続して、２レベルの比較基準電圧をコンパレー
タ回路に設定する手段としたことを特徴とする衛
星放送受信機のＡＦＴ回路。 (2) 前記ダイオードのアノード側を前記コンパ
レータの出力端子に接続し、同ダイオードのカソ
ード側を前記第２の抵抗と第３の抵抗の中間に接
続したことを特徴とする請求項(1)記載の衛星放
送受信機のＡＦＴ回路。 (3) 前記ダイオードのカソード側を前記コンパ
レータの出力端子に接続し、同ダイオードのアノ
ード側を前記第２の抵抗と第３の抵抗の中間に接
続したことを特徴とする請求項(1)記載の衛星放
送受信機のＡＦＴ回路。[Claims for Utility Model Registration] (1) The comparison reference voltage input pin of the comparator and the ground are connected through a first resistor, and the input pin and the comparison reference voltage source are connected in series through a second resistor and a third resistor. In the connected circuit, one end of a diode is connected to the output terminal of the comparator, and the other end of the diode is connected between the second resistor and the third resistor, and the two-level comparison reference voltage is connected to the comparator circuit. An AFT circuit for a satellite broadcasting receiver, characterized in that the AFT circuit has a means for setting. (2) The anode side of the diode is connected to the output terminal of the comparator, and the cathode side of the diode is connected between the second resistor and the third resistor. AFT circuit of a satellite broadcast receiver. (3) A cathode side of the diode is connected to an output terminal of the comparator, and an anode side of the diode is connected between the second resistor and the third resistor. AFT circuit of a satellite broadcast receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5994489U JPH03432U (en) | 1989-05-24 | 1989-05-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5994489U JPH03432U (en) | 1989-05-24 | 1989-05-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03432U true JPH03432U (en) | 1991-01-07 |
Family
ID=31586891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5994489U Pending JPH03432U (en) | 1989-05-24 | 1989-05-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03432U (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS539448A (en) * | 1976-07-15 | 1978-01-27 | Yamaki Electric | Comparator circuit |
| JPS5842668B2 (en) * | 1974-12-04 | 1983-09-21 | 株式会社日立製作所 | Pulse Densou Houshiki |
| JPS61252708A (en) * | 1985-05-01 | 1986-11-10 | Toshiba Corp | Power-on reset circuit |
| JPS6244533B2 (en) * | 1975-12-03 | 1987-09-21 | Allen & Hanburys Ltd |
-
1989
- 1989-05-24 JP JP5994489U patent/JPH03432U/ja active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5842668B2 (en) * | 1974-12-04 | 1983-09-21 | 株式会社日立製作所 | Pulse Densou Houshiki |
| JPS6244533B2 (en) * | 1975-12-03 | 1987-09-21 | Allen & Hanburys Ltd | |
| JPS539448A (en) * | 1976-07-15 | 1978-01-27 | Yamaki Electric | Comparator circuit |
| JPS61252708A (en) * | 1985-05-01 | 1986-11-10 | Toshiba Corp | Power-on reset circuit |
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