Junus2012
Advanced Member level 5
Dear friends,
In all of the op-amp design procedure given by any text, the maximum output voltage is designed and defined as the output range where the output transistor are at the boundary of saturation region, therefore for example if we take a simple two stage miller opamp, the maximum VOmax= VDD-VDS(sat)7 and VOmin = VSS+VDS(sat)6.
One can see the output range from the open loop DC transfer (Vin vs Vo), where the output range is the linear range and agrres to the last calculation.
However, These calculation ignores the load current, why ?
What is the simulation setup to run the output voltage range including load affect, I am thinking to connect the op amp in open loop configuration, and make Vo=Vomax by connecting Vin+> Vin-, then I sweep load (current source load) and record the drop of the output voltage, similarly I do Vin-> Vin+ to find the VOmin
Thank you in advance
In all of the op-amp design procedure given by any text, the maximum output voltage is designed and defined as the output range where the output transistor are at the boundary of saturation region, therefore for example if we take a simple two stage miller opamp, the maximum VOmax= VDD-VDS(sat)7 and VOmin = VSS+VDS(sat)6.
One can see the output range from the open loop DC transfer (Vin vs Vo), where the output range is the linear range and agrres to the last calculation.
However, These calculation ignores the load current, why ?
What is the simulation setup to run the output voltage range including load affect, I am thinking to connect the op amp in open loop configuration, and make Vo=Vomax by connecting Vin+> Vin-, then I sweep load (current source load) and record the drop of the output voltage, similarly I do Vin-> Vin+ to find the VOmin
Thank you in advance