Jun 30, 2011 #1 farshadr Newbie level 6 Joined Mar 1, 2011 Messages 12 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,281 Activity points 1,357 hi what name is this opamp ? i need to calculate Gain and Rout and Rin of circuit. please help me, this is emergency. so thanx **broken link removed**
hi what name is this opamp ? i need to calculate Gain and Rout and Rin of circuit. please help me, this is emergency. so thanx **broken link removed**
Jul 1, 2011 #2 jardila Junior Member level 2 Joined Sep 17, 2009 Messages 23 Helped 3 Reputation 6 Reaction score 2 Trophy points 1,283 Location Colombia Activity points 1,416 Hi, I don't know its name, but is a basic topology with two stages of gain. Gain = (gm1gm6/gm3)(ro6||ro8) Rin = inf. Rout = ro6||ro8 If you need a more extended explanation about how I obtained these results, you can ask me again. PD: I assume gm1=gm2 and gm5~8 are equal. Best Regards. Last edited: Jul 1, 2011
Hi, I don't know its name, but is a basic topology with two stages of gain. Gain = (gm1gm6/gm3)(ro6||ro8) Rin = inf. Rout = ro6||ro8 If you need a more extended explanation about how I obtained these results, you can ask me again. PD: I assume gm1=gm2 and gm5~8 are equal. Best Regards.
Jul 1, 2011 #3 leo_o2 Advanced Member level 4 Joined Sep 3, 2004 Messages 1,322 Helped 278 Reputation 558 Reaction score 241 Trophy points 1,343 Location China Activity points 5,761 I would like to correct the gain equation: Gain=gm1.(ro6||ro8)
Jul 1, 2011 #4 P permute Advanced Member level 3 Joined Jul 16, 2010 Messages 918 Helped 295 Reputation 590 Reaction score 266 Trophy points 1,343 Activity points 8,543 That is a "miller ota".
Jul 1, 2011 #5 D dgnani Advanced Member level 1 Joined Jul 25, 2009 Messages 424 Helped 160 Reputation 322 Reaction score 152 Trophy points 1,323 Location USA Activity points 4,007 The correct DC gain of this OTA is: (gm5/gm3)gm1(ro6||ro8) I guess leo_o2 assumed gm5=gm3 but this does not have to be
The correct DC gain of this OTA is: (gm5/gm3)gm1(ro6||ro8) I guess leo_o2 assumed gm5=gm3 but this does not have to be
Jul 1, 2011 #6 leo_o2 Advanced Member level 4 Joined Sep 3, 2004 Messages 1,322 Helped 278 Reputation 558 Reaction score 241 Trophy points 1,343 Location China Activity points 5,761 Yes. I supposed gm5=gm3. dgnani is correct. And it is one gain stage OTA.
Jul 1, 2011 #7 jardila Junior Member level 2 Joined Sep 17, 2009 Messages 23 Helped 3 Reputation 6 Reaction score 2 Trophy points 1,283 Location Colombia Activity points 1,416 Yes I made a mistake, sorry!, but I edited the post and fixed the error. Thanks for the observation.