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The bjt and cmos process

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chang830

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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
 

for impedance cmos is useful and for high speed switching BJT is useful
BJT is better than cmos in noise performance of the circuit but cmos is better than bjt in integaration
My advise is to use CMOS but pay attention to poles and zeros while you are designing the filter
 

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    chang830

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chang830 said:
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
Click to expand...

I perfer MOS, if you want a high liearity, you can use the Nauta cell as the gm to design a GM-C filter.

The linearity p1dB can be as large as 0dBm.
 

Hi, chang830

In addition to the comments already made I think the choice also should be based on the filter topology chosen (filter order, cascade design, direct design, voltage or current mode, gm-C, MOSFET-C, ...) .
Most probably the technology determines filter topology and vice versa.
It´s really not easy to find the best combination for a certain application (which always will be a compromize between conflicting parameters).
Good luck and regards to you.
 

go for combination of both as per the staged requirement.
 

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