CIC fixed point representation

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Amr Elhosiny
Amr Elhosiny 2015-3-16
回答： Ganesh Gaonkar 2015-3-16
Guys,
I'm somehow new to simulink. I'm trying to design a programable CIC From reading, you should design @ the highest decimation ratio then you choose output according to programable decimation ratio.
My problem is that I do not understand the fixed point notation. For example my CIC output WL=14/FL=5 and I need to divider by :
  • 2^3 for decimation ratio = 4
  • 2^5 for decimation ratio = 8
  • 2^7 for decimation ratio = 16
I need the output width to be 11 bits as I'm going to implement this as VHDL later. I knew that I should add a convert block after CIC to have my new data widths. Now I can not calculate the WL/FL for the three cases above.

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回答（1 个）

Ganesh Gaonkar
Ganesh Gaonkar 2015-3-16
Did you check if this block can help ? : cicdecimation
To know more about it's usage, you can try to go to the demo 'dspddc' which is about 'GSM Digital Down Converter'

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