020170
Full Member level 4
mosfet current mirror
when I use a Common source Amp, I usually use Current Mirror as active load instead of passive resistor.
it is desired that output impedance of Amp is low,
But Current Mirror equation tell me that
"if there is high output impedance, Currnet mirror has good output current
two story tell a truth. but if current mirror have good output current, that is, currnet mirror have high output impedance, what happen to amplifier? is it worse?
or I don't need to worry about that? tell me which is right.[/img]
when I use a Common source Amp, I usually use Current Mirror as active load instead of passive resistor.
it is desired that output impedance of Amp is low,
But Current Mirror equation tell me that
"if there is high output impedance, Currnet mirror has good output current
two story tell a truth. but if current mirror have good output current, that is, currnet mirror have high output impedance, what happen to amplifier? is it worse?
or I don't need to worry about that? tell me which is right.[/img]