JPS63181022U - - Google Patents
Info
- Publication number
- JPS63181022U JPS63181022U JP7344287U JP7344287U JPS63181022U JP S63181022 U JPS63181022 U JP S63181022U JP 7344287 U JP7344287 U JP 7344287U JP 7344287 U JP7344287 U JP 7344287U JP S63181022 U JPS63181022 U JP S63181022U
- Authority
- JP
- Japan
- Prior art keywords
- reference voltage
- output
- amplifier
- output means
- series
- 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
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Manipulation Of Pulses (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Description
第１図はこの考案の一実施例の構成を示す回路
図、第２図はモデムのキヤリヤ検出回路に要求さ
れるヒステリシス特性を説明するための説明図、
第３図は従来のモデムに適用されたキヤリア検出
回路の構成を示す回路図である。
６……比較増幅器、８……バツフアアンプ、１
０……キヤリア検出回路、１２，１３……トラン
ジスタ、１４……演算増幅器、１５……反転増幅
器、Ｒ１，Ｒ２，Ｒ３……抵抗、ＶＲ１……可変
抵抗、ＺＤ１，ＺＤ２……ツエナーダイオード。
FIG. 1 is a circuit diagram showing the configuration of an embodiment of this invention, and FIG. 2 is an explanatory diagram for explaining the hysteresis characteristics required for a carrier detection circuit of a modem.
FIG. 3 is a circuit diagram showing the configuration of a carrier detection circuit applied to a conventional modem. 6... Comparison amplifier, 8... Buffer amplifier, 1
0...Carrier detection circuit, 12, 13...Transistor, 14...Operation amplifier, 15...Inverting amplifier, R1 , R2 , R3 ...Resistor, VR1 ...Variable resistor, ZD1 , ZD2 ...Zener diode.
Claims (1)
段との間に介装され、互いに逆極性に直列接続さ
れて成る一対のツエナーダイオードと、 前記比較増幅器の基準電圧入力端と前記基準電
圧出力手段との間にエミツタおよびコレクタを介
して直列接続されたＰＮＰ型の第１のトランジス
タと、 エミツタおよびコレクタを前記第１のトランジ
スタと共通に接続されたＮＰＮ型の第２のトラン
ジスタと、 前記比較増幅器の基準電圧入力端と出力端との
間に直列接続された抵抗器と、 前記基準電圧出力手段の出力電圧に対応した電
圧を、前記第１および第２のトランジスタの制御
電圧として供給する制御手段と、 を具備することを特徴とする電圧比較回路。[Claims for Utility Model Registration] A comparator amplifier, a reference voltage output means with variable output voltage, and a comparator interposed between the output end of the comparator amplifier and the reference voltage output means, and connected in series with opposite polarities to each other. a pair of Zener diodes consisting of a pair of Zener diodes; a PNP type first transistor connected in series via an emitter and a collector between the reference voltage input terminal of the comparison amplifier and the reference voltage output means; a second NPN transistor commonly connected to the first transistor; a resistor connected in series between the reference voltage input terminal and the output terminal of the comparison amplifier; and an output voltage of the reference voltage output means. A voltage comparison circuit comprising: control means for supplying corresponding voltages as control voltages to the first and second transistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7344287U JPS63181022U (en) | 1987-05-15 | 1987-05-15 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7344287U JPS63181022U (en) | 1987-05-15 | 1987-05-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63181022U true JPS63181022U (en) | 1988-11-22 |
Family
ID=30917775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7344287U Pending JPS63181022U (en) | 1987-05-15 | 1987-05-15 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63181022U (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0496597A (en) * | 1990-08-14 | 1992-03-27 | Fujitsu Ltd | Two/four wire conversion circuit |
| USRE42738E1 (en) | 1997-10-28 | 2011-09-27 | Apple Inc. | Portable computers |
| US8866780B2 (en) | 2007-12-03 | 2014-10-21 | Apple Inc. | Multi-dimensional scroll wheel |
| US8872771B2 (en) | 2009-07-07 | 2014-10-28 | Apple Inc. | Touch sensing device having conductive nodes |
| US8933890B2 (en) | 2003-11-25 | 2015-01-13 | Apple Inc. | Techniques for interactive input to portable electronic devices |
| US8952886B2 (en) | 2001-10-22 | 2015-02-10 | Apple Inc. | Method and apparatus for accelerated scrolling |
| US9354751B2 (en) | 2009-05-15 | 2016-05-31 | Apple Inc. | Input device with optimized capacitive sensing |
| US9360967B2 (en) | 2006-07-06 | 2016-06-07 | Apple Inc. | Mutual capacitance touch sensing device |
| US9367151B2 (en) | 2005-12-30 | 2016-06-14 | Apple Inc. | Touch pad with symbols based on mode |
| US9405421B2 (en) | 2006-07-06 | 2016-08-02 | Apple Inc. | Mutual capacitance touch sensing device |
| US9454256B2 (en) | 2008-03-14 | 2016-09-27 | Apple Inc. | Sensor configurations of an input device that are switchable based on mode |
-
1987
- 1987-05-15 JP JP7344287U patent/JPS63181022U/ja active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0496597A (en) * | 1990-08-14 | 1992-03-27 | Fujitsu Ltd | Two/four wire conversion circuit |
| USRE45559E1 (en) | 1997-10-28 | 2015-06-09 | Apple Inc. | Portable computers |
| USRE42738E1 (en) | 1997-10-28 | 2011-09-27 | Apple Inc. | Portable computers |
| USRE44855E1 (en) | 1997-10-28 | 2014-04-22 | Apple Inc. | Multi-functional cellular telephone |
| USRE44103E1 (en) | 1997-10-28 | 2013-03-26 | Apple Inc. | Portable computers |
| US8952886B2 (en) | 2001-10-22 | 2015-02-10 | Apple Inc. | Method and apparatus for accelerated scrolling |
| US9009626B2 (en) | 2001-10-22 | 2015-04-14 | Apple Inc. | Method and apparatus for accelerated scrolling |
| US8933890B2 (en) | 2003-11-25 | 2015-01-13 | Apple Inc. | Techniques for interactive input to portable electronic devices |
| US9367151B2 (en) | 2005-12-30 | 2016-06-14 | Apple Inc. | Touch pad with symbols based on mode |
| US9360967B2 (en) | 2006-07-06 | 2016-06-07 | Apple Inc. | Mutual capacitance touch sensing device |
| US9405421B2 (en) | 2006-07-06 | 2016-08-02 | Apple Inc. | Mutual capacitance touch sensing device |
| US8866780B2 (en) | 2007-12-03 | 2014-10-21 | Apple Inc. | Multi-dimensional scroll wheel |
| US9454256B2 (en) | 2008-03-14 | 2016-09-27 | Apple Inc. | Sensor configurations of an input device that are switchable based on mode |
| US9354751B2 (en) | 2009-05-15 | 2016-05-31 | Apple Inc. | Input device with optimized capacitive sensing |
| US8872771B2 (en) | 2009-07-07 | 2014-10-28 | Apple Inc. | Touch sensing device having conductive nodes |