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Chapter 2:
Functional Description
This chapter provides a functional description of Lattice's CIC Filter IP core. Figure 2-1 shows a top-level inteface
diagram for the CIC Filter.
Figure 2-1. Top-level Interface Diagram for CIC Filter
clk
ce
rstn
clear
din
do u t
o u t v alid
inp v alid
i b start
CIC Filter
o b start
rfi
firdf
firdfset
rate
rateset
A CIC filter is constructed using two kinds of blocks: an integrator and a comb. An integrator is a single-pole IIR fil-
ter with a unity feedback coefficient operating at a higher sampling rate, f S . A comb is a FIR filter with M unity differ-
ential delays operating at a lower sampling rate, f S /R, where M and R are integers. The main features of the
integrator and the comb are summarized in Table 2-1 .
Table 2-1. Main Features of Integrator and Comb
Feature
Integrator
Comb
Z
-1
Z
-M
Structure
x(n)
+
+
+
y(n)
x(n)
+
-
+
y(n)
Sampling Rate
y[n]
H I (z)
|H(e jw )| 2
IPUG42_02.6, August 2010
f s
y[n-1] + x[n]
1
1 - z -1
1
2(1 - cos ω )
9
f s /R
x[n] -x[n-RM]
1 - z -RM
2(1 - cos RM ? )
Cascaded Integrator-Comb (CIC) Filter User’s Guide
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CIC-FILT-XM-UT2 制造商:Lattice Semiconductor Corporation 功能描述:
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