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Opamp matching - which pairs have to be matched together?

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hayaloo

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opamp matching

hi all

could anyone tell me in the 2 stage opamp which pairs have to be matched together.

thank you
 

Re: opamp matching

Marked up; the diff pair and mirror naturally must match; the common-source
gain stage has a matching requirement but not 1:1, its load current needs to
be 1/2 the diff pair tail current (assuming unit devices) for equal current density
/ VT. In the PTAT reference matching may not be strictly necessary but hygeine
never hurts. The output Class A buffer is a don't-care.
 

    hayaloo

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