I want to design a Bandgap, and how determine my bandgap is good? I must do what simulation. And if I want to simulate frequency response for my bandgap, I must compose my netlist? Please help me?
Thanks.
Bandgap reference circuit: the function of this circuit is to generate a Reference Volatage or Current which is independent of PTV and supply.
Thus, what you need is to check whether Voltage or current reference is independent of of PTV and supply?
Another important bandgap analysis is to ramp-up the power supply for at least 1us in Transient analysis and check if the Bandgap settles to its desired value. You will have to include a start-up circuit for your bandgap to ensure this.
For DC analysis, sweep temperature and view the bandgap output versus temperature graph. You should see a parabolic curve to indicate that your bandgap is functioning.
As for stability check, do u have any negative feedbacks in your circuit? (Eg: error amplifier to maintain equal voltages at the PTAT branch) If you do then you will need to run AC analysis to check for the phase margin and loop gain of the feedback.
A high psrr is definitly good... to reject noise on the BGR output.
b'coz this noise will directly effect the performance of the circuit which uses the reference voltage( ADC DAC Voltage regulators).
For AC analysis( stability purpose) refer to the figure attached.