Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Opamp matching - which pairs have to be matched together?

Status
Not open for further replies.

hayaloo

Newbie level 5
Joined
Jul 1, 2009
Messages
9
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,338
opamp matching

hi all

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

thank you
 

dick_freebird

Advanced Member level 5
Joined
Mar 4, 2008
Messages
7,227
Helped
2,117
Reputation
4,238
Reaction score
1,967
Trophy points
1,393
Location
USA
Activity points
57,948
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

    Points: 2
    Helpful Answer Positive Rating
Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top