OPA2365 - Sallen-Key HP continous saturation

Rbrt

Other Parts Discussed in Thread: OPA2365

Hi,

I would like to implement a 4th order sallen-key hp filter with two gain stages to filter/amplify an ultrasonic signal at 200kHz. The filter-incoming signal level rises continously and I need high gain particulary on the first few incoming periods which means that at a high gain later (in time) incoming signal-periods, at a high signal level, will force the op amp to go into saturation. This from the signal processing point of view is not a problem but I wonder if it would harm the op amps (OP2365) if they are forced to saturation in continous operation over years?

Thanks.

Best,

Rob.

over 15 years ago

0 Miro Oljaca over 15 years ago

TI__Intellectual 2970 points

Saturation of the outptu stage will not have any negative consequences on the OpAmp (OPA2365) long term operation. Care needs to be taken to insure that out

0 Rbrt over 15 years ago in reply to Miro Oljaca

Prodigy 70 points

Dear Miro,

Thanks, very useful info! But is your post finished, seems like it is cutt off after the first line " Care needs to be taken to insure that out .... " Is there something that you wanted to point to in addition?

Best,

Rob.

0 Miro Oljaca over 15 years ago in reply to Rbrt

TI__Intellectual 2970 points

Sorry for that. It was supose to be:

Care needs to be taken to insure that output current doesnot excede nominal value. In other words the load resistance as well as feedback resistor needs to be account as efective load to the OpAmp output.

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OPA2365 - Sallen-Key HP continous saturation