Hi Trexy, Nice to meet you. Thank you so much for the good questions. I have comments below in line. how much current should I apply to the diode-connected transistor? [CC] You can apply the amount of the current range in your design. should the current be small enough to observe the threshold voltage of the transistor? or just provide the transistor with a reasonable amount to operate in normal condition? [CC] You can provide the transistor with a reasonable amount to operate in normal condition, which fits the current range in your design at other analog blocks. Thanks, CC