Nov 30, 2007 #1 F firsttimedesigning Full Member level 1 Joined Jul 4, 2007 Messages 97 Helped 1 Reputation 2 Reaction score 1 Trophy points 1,288 Activity points 2,241 why is the open loop gain of an opamp can be expressed as the following equation: Aol = Aol(0) / (1+j (f/f3db)) where, Aol = open loop gain Aol(0) = open loop gain of the opamp when the frequency is 0 f = frequency f3db = 3db cutoff frequency
why is the open loop gain of an opamp can be expressed as the following equation: Aol = Aol(0) / (1+j (f/f3db)) where, Aol = open loop gain Aol(0) = open loop gain of the opamp when the frequency is 0 f = frequency f3db = 3db cutoff frequency
Nov 30, 2007 #2 hr_rezaee Advanced Member level 3 Joined Oct 6, 2004 Messages 747 Helped 109 Reputation 218 Reaction score 24 Trophy points 1,298 Location Iran-Mashhad Activity points 4,025 Open Loop Gain Hi this is just one pole model. why not? for f<<f3db |Aol|=Aol(0) for f=f3db |Aol|=Aol(0)/√(2) for f=∞ |Aol|=0 why not? it is the simplest model. yes, you can use more complicated models depend your circuit and precision.
Open Loop Gain Hi this is just one pole model. why not? for f<<f3db |Aol|=Aol(0) for f=f3db |Aol|=Aol(0)/√(2) for f=∞ |Aol|=0 why not? it is the simplest model. yes, you can use more complicated models depend your circuit and precision.
Dec 2, 2007 #3 P phosphor_zhu Junior Member level 1 Joined Oct 29, 2007 Messages 19 Helped 1 Reputation 2 Reaction score 0 Trophy points 1,281 Activity points 1,393 Re: Open Loop Gain you may use small signal model to get the expresion of gain; and then you make sure the main pole of ur circuit. then , i think u get that.
Re: Open Loop Gain you may use small signal model to get the expresion of gain; and then you make sure the main pole of ur circuit. then , i think u get that.
Dec 2, 2007 #4 P peterwang Member level 1 Joined Oct 31, 2007 Messages 33 Helped 5 Reputation 10 Reaction score 2 Trophy points 1,288 Activity points 1,436 Re: Open Loop Gain I suggest you read Ch7 of : Op Amps for Everyone (pdf file) Author: Ron Manchini You can get it here: **broken link removed**
Re: Open Loop Gain I suggest you read Ch7 of : Op Amps for Everyone (pdf file) Author: Ron Manchini You can get it here: **broken link removed**
Dec 3, 2007 #5 Q qutang Full Member level 5 Joined Oct 25, 2004 Messages 305 Helped 9 Reputation 18 Reaction score 3 Trophy points 1,298 Activity points 1,581 Open Loop Gain this is a frequency dominant equation.
Dec 3, 2007 #6 S satyasiva Full Member level 1 Joined Nov 9, 2006 Messages 98 Helped 5 Reputation 10 Reaction score 2 Trophy points 1,288 Activity points 1,714 Open Loop Gain because the gain depends onfrequency