Jun 12, 2010 #1 J jszair Junior Member level 3 Joined Sep 25, 2009 Messages 25 Helped 1 Reputation 2 Reaction score 1 Trophy points 1,283 Activity points 1,479 Could anyone explain where's the positive and negative feedback in the attached PTAT current ref? Thanks a bunch!
Could anyone explain where's the positive and negative feedback in the attached PTAT current ref? Thanks a bunch!
Jun 12, 2010 #2 A afujian Member level 4 Joined Mar 26, 2010 Messages 70 Helped 2 Reputation 4 Reaction score 1 Trophy points 1,288 Location china Activity points 1,715 In my opinion: 1.if x increases→ current through M1 decreases→current through M2 decreases→Y decreases。so x is negative feedback. 2.if Y increases,but I2 must equal I1 →gage of M2 increases→I1 increases→I2 increases,then positive feedback.
In my opinion: 1.if x increases→ current through M1 decreases→current through M2 decreases→Y decreases。so x is negative feedback. 2.if Y increases,but I2 must equal I1 →gage of M2 increases→I1 increases→I2 increases,then positive feedback.