JPS6451705A - Isolation amplifier - Google Patents
Isolation amplifierInfo
- Publication number
- JPS6451705A JPS6451705A JP62208775A JP20877587A JPS6451705A JP S6451705 A JPS6451705 A JP S6451705A JP 62208775 A JP62208775 A JP 62208775A JP 20877587 A JP20877587 A JP 20877587A JP S6451705 A JPS6451705 A JP S6451705A
- Authority
- JP
- Japan
- Prior art keywords
- operational amplifier
- noninverting input
- input
- resistor
- mode noise
- 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.)
- Granted
Links
Landscapes
- Amplifiers (AREA)
Abstract
PURPOSE:To prevent deterioration in the isolation characteristic by using part of a bias circuit impressing a bias voltage to a noninverting input of an operational amplifier and a detection circuit detecting the common mode noise in common. CONSTITUTION:Part of the bias circuit impressing a bias voltage to a noninverting input of an operational amplifier OP and the detection circuit detecting the common mode noise are used in common. That is, A resistor R3 and a capacitor C1 connected in series between the noninverting input of the operational amplifier OP and the input ground system A and a resistor R7 and a capacitor C3 connected in series between the noninverting input of the operational amplifier OP and the output grounding system B detect the common mode noise generated because of different grounding systems A, B between the devices. Since only the resistor R3 exists in terms of AC when viewing the noninverting input of the operational amplifier OP and the input grounding system A, the deterioration in the isolation characteristic is prevented.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62208775A JPH0687528B2 (en) | 1987-08-22 | 1987-08-22 | Isolation amplifier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62208775A JPH0687528B2 (en) | 1987-08-22 | 1987-08-22 | Isolation amplifier |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6451705A true JPS6451705A (en) | 1989-02-28 |
JPH0687528B2 JPH0687528B2 (en) | 1994-11-02 |
Family
ID=16561889
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62208775A Expired - Lifetime JPH0687528B2 (en) | 1987-08-22 | 1987-08-22 | Isolation amplifier |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0687528B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5347572A (en) * | 1990-09-06 | 1994-09-13 | Teletron Ltd. | Telephone line monitoring apparatus and method |
-
1987
- 1987-08-22 JP JP62208775A patent/JPH0687528B2/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5347572A (en) * | 1990-09-06 | 1994-09-13 | Teletron Ltd. | Telephone line monitoring apparatus and method |
US5553116A (en) * | 1990-09-06 | 1996-09-03 | Teletron Ltd. | Telephone line monitoring apparatus and method |
Also Published As
Publication number | Publication date |
---|---|
JPH0687528B2 (en) | 1994-11-02 |
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