JPS55677A - Analog input device - Google Patents
Analog input deviceInfo
- Publication number
- JPS55677A JPS55677A JP715379A JP715379A JPS55677A JP S55677 A JPS55677 A JP S55677A JP 715379 A JP715379 A JP 715379A JP 715379 A JP715379 A JP 715379A JP S55677 A JPS55677 A JP S55677A
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- resistance
- input
- capacitor
- filter
- 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
Landscapes
- Electronic Switches (AREA)
Abstract
PURPOSE: To reduce the effect of the transformer sag and thus to increase the accuracy of the compensation circuit by increasing the input impedance regardless of On or OFF of the power supply of the device.
CONSTITUTION: Resistance 2 of the input filter and capacitor 3 or resistance 1 of the input filter are connected in series via the source and the drain of FET 12 by making use of the fact that the enhancement type of MOSFET12 is turned off at the non-bias time. The power supply of the device is connected to gate terminal 2, and FET12 is switched on when the power supply is ON to transmit the input signal voltage to filter capacitor 3. While FET12 is switched off when the power supply is OFF, with the input signal voltage cut off. Thus, the input resistance is increased greatly when viewed from the signal source, and at the same time junction type FET19 featuring a comparatively low ON-resistance is provided between capacitor 3 and transformer 5 to perform switching. Then the waveform featuring the reduced amount of sag is transmitted to the secondary side to ensure the high- accuracy insulated transmission.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP715379A JPS55677A (en) | 1979-01-26 | 1979-01-26 | Analog input device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP715379A JPS55677A (en) | 1979-01-26 | 1979-01-26 | Analog input device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55677A true JPS55677A (en) | 1980-01-07 |
Family
ID=11658115
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP715379A Pending JPS55677A (en) | 1979-01-26 | 1979-01-26 | Analog input device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55677A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4931707A (en) * | 1989-08-14 | 1990-06-05 | General Motors Corporation | Impedance matching circuit |
-
1979
- 1979-01-26 JP JP715379A patent/JPS55677A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4931707A (en) * | 1989-08-14 | 1990-06-05 | General Motors Corporation | Impedance matching circuit |
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