OPAy211 spice model floating node M55 substrate?

JohnP

Dear Sir

I think there may be a floating node in the spice model for the OPAy211. In particular the substrate node for M55 labelled as node 4 does not seem to be connected to anything else. Please can you suggest where it should be connected?

Thanks

over 10 years ago

0 Arash Loloee over 10 years ago

TI__Mastermind 36461 points

Hi John,

Since M55 is an NMOS, the substrate should be connected to Vee, the most negative voltage. For M55, the source is already tied to Vee (negative supply).

so you can short the source and back gate together to Vee.

Regards,

Arash

0 JohnP over 10 years ago in reply to Arash Loloee

Intellectual 470 points

Thanks very much.

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OPAy211 spice model floating node M55 substrate?