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How to define the op-amp parameter in this low-pass filter?

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cqmyg5

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Hi,

I want to design a op-amp on 0.18u CMOS process, which could be suitable for this low-pass filter.

For simulating the op-amp, I have to define the load cap and load resistor, what's the value? it's 2.653pF and 70.71k/100k as showed in the figure? OR, it's not neseccery to care about these cap/res
 

cqmyg5

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please give me a hand, thanks!
 

willyboy19

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Re: How to define the op-amp parameter in this low-pass filt

Your opamp needs to drive 100kohm resistive load and 2.6pF capacitive load, with certain amount of gain-bandwidth-product. This GBW should be 5~10 time higher than your LPF corner frequency.
 

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