cascaded integrator comb filter 長庚電機通訊組 碩一 張晉銓 指導教授 :...
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Cascaded Integrator Comb Filter
長庚電機通訊組 碩一 張晉銓
指導教授 : 黃文傑博士
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Outline
What is Cascaded Integrator Comb (CIC) Filter
CIC filter transfer function CIC filter Implemented Register Growth Conclusions
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What is Cascaded Integrator Comb (CIC) Filter
In SDR system, samples rate changes very large. A digital linear phase finite impulse (FIR) filters for
decimation and interpolation. No multipliers and use limited storage. Cascaded ideal integrator stages operating at a high
sampling rate and an equal number of comb stages operating at a low sampling rate.
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What is Cascaded Integrator Comb (CIC) Filter
Well-suited for FPGA and ASIC implementation Reduce the computational expense of the
operation
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CIC filter transfer function
LI zMzH )
1
11()(
1 L
c zzH )1()( 1
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CIC filter transfer function
1 &2 stage CIC frequency response for M=8
L
Mjjw
LM
k
kM
eM
M
eH
zMz
z
MzH
]2/)1[(
1
01
2sin
2sin
)(
)1
()1
11()(
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CIC filter transfer function 4 stage CIC frequency response for M=8 &16
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CIC Implement of an Decimation Filter
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CIC Implement of an interpolation Filter
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Register GrowthMLBB in 2max log
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Conclusions
Advantage No multipliers ,no storage is required for filter
coefficients The structure of CIC filters is very “regular” Little external control or complicated local timing
is required Easily design for wide range of rate change
factors “M”, with addition of scaling circuit and minimal changes filter timing
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Conclusions
Disadvantage Register widths can become large with “M” If system with a fixed decimation ratio, need a des
igned filter to compensate for the CIC passband droop.
Frequency response is fully determined by M & L A new CIC decimation filter with using
“sharpening”
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End
Thank you for your attention