opamp input protection

[diy didi]

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.

[vacuphile]

To protect against DC, coupling cap. What other kind of protection would you wish?

[hien.t.nguyen]

Originally Posted by diy didi

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,

[discrete]

See section 7.4:

http://www.analog.com/library/analog...h7_final_J.pdf

[diy didi]

Thanx Discrete!!!
That will do just fine.