Wide swing folded cascode

[rvidya]

hi...

I'm trying to design a wide swing folded cascode amplifier..I'm following the design procedure in Allen Holdberg...But I'm getting devices sizes with w/l <1 for some of the transistors..Is it valid? Or should I readjust the sizes by changing gm/id?

Thanks in advance

 

[ZekeR]

If w/l < 1, then that means you want a long device (i.e., "w" will have a minimum dimension, say, 1um, so you will want to make "l" have a larger dimension, say, 2um). w/l < 1 means low gm, which is desirable for current mirrors and active loads (to minimize the effects of Vth mismatches).

 

[rvidya]

Thanks...,There was a mistake in my calculations... forgot to convert frequency into radians...problem solved now...