dandelion wrote on Jul 22nd, 2008, 7:00pm:Hi,
I am desiging an active filter. I have the cmos and bjt process availble and they all have enough Ft to meet the bandwicth requirements.
I wonder which process you advised me to use? E.g, from the point of lineraity characteristics, which one is better?
Thanks
Linearity? Well, that would depend a lot on the design techniques you use, and the supply voltage you have available to you. I would say that it is possible to make highly linear filters using either MOS or BJT. The high input impedance of the MOS gate makes the design a lot easier though. Otherwise, there is not much to choose between the two if the 1/f noise and offset issues are not critical (you only mention linearity).
I would say the following: Go with the one you know much better. The chances are that you will make a better MOS design than a BJT one if you are used to MOS.
Regards
Vivek