I want to know is there any specific methodology for making or driving the reference voltage of a "Switched Capacitor Common Mode Feedback" circuit in designing an operational amplifier on not?
My problem is that, by using a simple "MOS Diode" configuration for making this voltage, the output common mode voltage will set very slowly at the beginning of the work and to prevent it, I have to use a large current for driving the configuration and so a large power.
Also there is a same problem for making the input common-mode voltage.
for the reference voltage of sc cmfb, just use a dioded mos biased properly. maybe the setup time is long if supply the dioded mos by small current, but in most time, this time is tolerant, i think
the input common-mode voltage of a sc integrator is determined by input cm voltage, output cm voltage and feedback cm voltage if have of the integrator, so we don't need to set it in particular