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Old 16th January 2012, 04:03 PM   #1
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Default opamp input protection

Hi
Anyone have a paper discussing the various methods of protecting opamp inputs?? I know there are a couple of ways, but uncertain as to which works best where.
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Old 16th January 2012, 04:19 PM   #2
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To protect against DC, coupling cap. What other kind of protection would you wish?
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Old 16th January 2012, 04:30 PM   #3
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Quote:
Originally Posted by diy didi View Post
Hi
Anyone have a paper discussing the various methods of protecting opamp inputs?? I know there are a couple of ways, but uncertain as to which works best where.
Opamp often broken because signal input have large voltage(AC/DC larger supply voltage).
The ways simply to protect it is:
1. Connect input opam with resistor to current limit input.This way is not very good results but may be acceptable.

2. Use two diodes connected reverse with B+/B-.This way is very good results but diode may be cause noise,rarely used in hi-end circuit.

What do you ways to protect opamp?

Regrads,
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Last edited by hien.t.nguyen; 16th January 2012 at 04:34 PM.
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Old 16th January 2012, 04:35 PM   #4
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See section 7.4:

http://www.analog.com/library/analog...h7_final_J.pdf
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Old 17th January 2012, 03:47 AM   #5
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Thanx Discrete!!!
That will do just fine.
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Old 18th March 2013, 06:30 PM   #6
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Default Also consider...

...my "Application" Note, including capacitive problems on Z-Diodes
http://www.ac-vogel.de/amp/APN004_Tu...Protection.pdf
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