itmr
Member level 3
Hi ALL
I working on aplication that i need to sample 1.9Khz signal by 1Mhz , its mean 512 OSR - AFTER SIGMA DELTA MODULATION ( FOR SEPARATE the quantization noise from the signal) i need to decimate the signal by decimatin rate of 512.
i decided to use CIC filter to decimate by 128 and then cascade more 2 FIR - one as compensator and the other for the phase linearization.
the DC gain in the CIC is a function of the DECIMATION RATE AND THE STAGES so i getting about 100 db in the dc...
i need to create compensation filter to compensate the very large GAIN that i getting in DC ( about 100db).
to get flatness passband i need to use inverse sinc fir compensator that attenuate by 100 db in the DC...
does some one have another solution to this problem ?
does some one have expirience with the inverse sinc filter?
THANK U ALL
I working on aplication that i need to sample 1.9Khz signal by 1Mhz , its mean 512 OSR - AFTER SIGMA DELTA MODULATION ( FOR SEPARATE the quantization noise from the signal) i need to decimate the signal by decimatin rate of 512.
i decided to use CIC filter to decimate by 128 and then cascade more 2 FIR - one as compensator and the other for the phase linearization.
the DC gain in the CIC is a function of the DECIMATION RATE AND THE STAGES so i getting about 100 db in the dc...
i need to create compensation filter to compensate the very large GAIN that i getting in DC ( about 100db).
to get flatness passband i need to use inverse sinc fir compensator that attenuate by 100 db in the DC...
does some one have another solution to this problem ?
does some one have expirience with the inverse sinc filter?
THANK U ALL