JPS60136562U

JPS60136562U - signal transmission circuit

Info

Publication number: JPS60136562U
Application number: JP2541784U
Authority: JP
Inventors: 勇奥田
Original assignee: 松下電器産業株式会社
Priority date: 1984-02-23
Filing date: 1984-02-23
Publication date: 1985-09-10

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は従来の信号伝送回路の構成図、第２図は第１図
の特性図、第３図は本考案に基づく信号伝送回路の一実
施例を示す構成図、第４図と第５図は第３図の特性図、
第６図は第３図の送信回路の他の実施例を示す構成図、
第７図は第６図の特性図、第８図は第２図の送信回路の
更に他の実施例の構成図である。１・・・送信回路、２・・・送信回路、３・・・信号線
、４・・・電源共通線、１０〜１２・・・スイッチ、１
８・・・可変抵抗要素、１９・・・演算増幅器、２２・
・・帰還抵抗、Ｖｒｅｆ・・・基準電圧、Ｖｃｃ・・・
電源電圧、Ｖｏ・・・出力電圧。Fig. 1 is a block diagram of a conventional signal transmission circuit, Fig. 2 is a characteristic diagram of Fig. 1, Fig. 3 is a block diagram showing an embodiment of a signal transmission circuit based on the present invention, and Figs. The figure is the characteristic diagram of Figure 3,
FIG. 6 is a configuration diagram showing another embodiment of the transmitting circuit shown in FIG. 3;
7 is a characteristic diagram of FIG. 6, and FIG. 8 is a configuration diagram of still another embodiment of the transmitting circuit of FIG. 2. DESCRIPTION OF SYMBOLS 1... Transmission circuit, 2... Transmission circuit, 3... Signal line, 4... Power supply common line, 10-12... Switch, 1
8... Variable resistance element, 19... Operational amplifier, 22...
...Feedback resistance, Vref...Reference voltage, Vcc...
Power supply voltage, Vo...output voltage.

Claims

[Claims for Utility Model Registration] 1. A transmitting circuit and a receiving circuit housed in different casings are connected to each other by a pair of transmission lines consisting of a signal line and a power supply common line, and the transmitting circuit is connected to the signal line and the power supply common line. The receiving circuit is constructed of a variable resistance element that can change the resistance value between the common lines, and the receiving circuit is configured such that a predetermined reference voltage is applied to one input terminal of a differential amplifier, and the other input terminal is connected to the differential amplifier through a feedback resistor. is connected to the output terminal of the differential amplifier, and is also connected to one end of the power supply and the signal line through a resistor to apply a voltage corresponding to a change in the resistance value of the variable resistance element in the transmission circuit to the differential amplifier. A signal transmission circuit configured to extract from the output. 2. The signal transmission circuit according to claim 1, wherein the variable resistance element of the transmission circuit is constituted by a plurality of resistors and a plurality of switches. 3. The variable resistance element of the transmitting circuit is connected in parallel with multiple series-connected resistors and switches, and one or more resistors, and the resistor connected in series with the switch has the smallest resistance value among them. When R is set, the respective resistance values are R, 2R, and 4R. The signal transmission circuit according to claim 2 of the utility model registration claim, characterized in that the decoy is determined almost exponentially. 4. The signal transmission circuit according to claim 2, wherein each switch in the variable resistance element of the transmission circuit is constituted by a semiconductor switch such as a transistor or an analog switch.