ICdesignerbeginner
Member level 5
I can say that I understand simple current mirrors fairly well, but what i do not understant is the minimum output voltage requierd for the circuit to work properly...for the transistors to be in saturation.
NMOS cascode current mirror
Vout=V(D4). Vds_sat is the saturation voltage of the transistor M2 and M4. Vt is the treshold voltage.
Why is the minimum output voltage, on the drain of the M4, equal to the Vout_min=Vt+2*Vds_sat, why not only 2*Vds_sat?
What will be the voltage drop for self cascode current mirror. How is it equal to 2vdsat.
NMOS cascode current mirror
Vout=V(D4). Vds_sat is the saturation voltage of the transistor M2 and M4. Vt is the treshold voltage.
Why is the minimum output voltage, on the drain of the M4, equal to the Vout_min=Vt+2*Vds_sat, why not only 2*Vds_sat?
What will be the voltage drop for self cascode current mirror. How is it equal to 2vdsat.