BQ2000: May we know how to reduce input noise?

Is it the noise frequency same as the switching frequency? Please add more input capacitors to reduce the switching frequency noise.
Also, you can increase the inductor value to reduce the ripple current.
If the noise still cannot pass the test after adding more capacitors and increasing the inductor value, please add LC filter or "Pie" filter at input.

Hi Sir
we have add pie circuit in input side. the CLC(100nH 100uH 100nH) value is reference as below link page 6(figure 7).
there have reduce Vp-p ripple. we are not clear know how to calculate CLC value and what we need to notice. may you pls help for example to us?
www.designers-guide.org/.../bypassing.pdf
Bogey