Dear friends,
I have simulated all the possible configuration
I am getting almost the same current even after performing the Montecarlo simulation, Worst case corners and under wide temperature range from -55 to 155.
Until now this simulation prove that the simpler one in circuit C can provide same biasing voltage with less design complexity and area.
I am testing the biasing voltage for biasing wide swing current mirror and monitoring the current.
The only remaining thing from your suggestion is to simulate the PSRR. your arguments was that the cascoded transistor should give better PSRR. However, an important fact is that those are not cascoded transistors, because only the down dioide connected transistor is in saturation and other works in series. So they are Series transistors not cascoded.
By any way I would like to follow your suggestion to simulate the PSRR, but I don't know the setup. I usually do the PSRR for the opamp by connecting it as a unity gain buffer and put an AC source in series with the supply voltage then I run the AC simulation to find the transfer function from the output to the AC source.
Basically this should also work with the biasing voltage by running the AC simulation to find the transfer function from Vbias to the AC sourcem but I am getting Zero. Could you please correct me my setup ?
Attached you see please the circuit setup
Thank you in advance