Choosing smaller overdrive voltages to maintain high W/L ?

[cjupiter]

overdrive voltages

I am following the design example for a folded cascode amplifier in Razavi's book. The opamp design incorporates high drain currents (1.5mA). However in my design i would like to use a 200uA current reference. This decreases my W/L ratios to unreasonable values. Should I choose smaller overdrive voltages to maintain high W/L ratios? . Im using a 3.3V power supply.

 

[djalli]

overdrive voltages

Why you dont try that and see it. It may work I think.

 

[bastos4321]

Re: overdrive voltages

You should use similar overdrive voltages, so decreve the W/L. However typical values are between 100-200mV for normal linear operation.

Bastos