Feb 24, 2007 #1 A asnprabhu Newbie level 4 Joined Feb 23, 2007 Messages 7 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,281 Activity points 1,338 Can you explain me the poles and zeros that exists
Feb 25, 2007 #2 gingerjiang Full Member level 3 Joined Mar 1, 2006 Messages 171 Helped 17 Reputation 34 Reaction score 6 Trophy points 1,298 Activity points 2,181 do you mean a 2-stage fully differential op-amp? what is your amplifier architecture? which type compensation?
do you mean a 2-stage fully differential op-amp? what is your amplifier architecture? which type compensation?
Feb 25, 2007 #3 A asnprabhu Newbie level 4 Joined Feb 23, 2007 Messages 7 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,281 Activity points 1,338 I'm talking abt 2-state fully differential op-amp with Resistor and capacitor compensation. these R and C are used between stage 1 and stage 2 where in capacitor is used for pole compensation, and resistor for pushing the zero to infinity. I remember this but if u know more details abt his can you explain?
I'm talking abt 2-state fully differential op-amp with Resistor and capacitor compensation. these R and C are used between stage 1 and stage 2 where in capacitor is used for pole compensation, and resistor for pushing the zero to infinity. I remember this but if u know more details abt his can you explain?
Feb 25, 2007 #4 gingerjiang Full Member level 3 Joined Mar 1, 2006 Messages 171 Helped 17 Reputation 34 Reaction score 6 Trophy points 1,298 Activity points 2,181 dominant pole is -1/(gm2*r2*r1*cc); secondary pole is -gm2*cc/(c1*c2+cc*c1+cc*c2); another pole is -1/(rz*c1); zero is 1/(cc*(1/gm2-rz)). in general, make secondary pole and zero equal, so we get good phase margin (cc compensation capacitor, rz nulling resistor)
dominant pole is -1/(gm2*r2*r1*cc); secondary pole is -gm2*cc/(c1*c2+cc*c1+cc*c2); another pole is -1/(rz*c1); zero is 1/(cc*(1/gm2-rz)). in general, make secondary pole and zero equal, so we get good phase margin (cc compensation capacitor, rz nulling resistor)