bamboo
Junior Member level 2
I am a newer designer in SCF.
I design a second-order post filter in delta-sigm DAC.
I can get the ratio of Cin and Cfb in each stage SCF to meet the transfer function.
But I am confused about how to determine the real size of Cin
As I know, the thermal noise of first op amp input pair and (KT/C) dominate the
nosie power, especially the input cap Cin. So
1. If anyone can give me any comment about how to determine the real size of
cap according to the spec (kT/C, resolution ,OSC, Vp-p, etc)?
2. Where can I get more detailed information about this topic ?
Thanks for your help !
I design a second-order post filter in delta-sigm DAC.
I can get the ratio of Cin and Cfb in each stage SCF to meet the transfer function.
But I am confused about how to determine the real size of Cin
As I know, the thermal noise of first op amp input pair and (KT/C) dominate the
nosie power, especially the input cap Cin. So
1. If anyone can give me any comment about how to determine the real size of
cap according to the spec (kT/C, resolution ,OSC, Vp-p, etc)?
2. Where can I get more detailed information about this topic ?
Thanks for your help !
