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Cascaded Integrator Comb Filter

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. Outline. What is Cascaded Integrator Comb (CIC) Filter CIC filter transfer function CIC filter Implemented Register Growth Conclusions. What is Cascaded Integrator Comb (CIC) Filter.

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Cascaded Integrator Comb Filter

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  1. 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

  2. Outline • What is Cascaded Integrator Comb (CIC) Filter • CIC filter transfer function • CIC filter Implemented • Register Growth • Conclusions

  3. 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.

  4. What is Cascaded Integrator Comb (CIC) Filter • Well-suited for FPGA and ASIC implementation • Reduce the computational expense of the operation

  5. CIC filter transfer function

  6. CIC filter transfer function • 1 &2 stage CIC frequency response for M=8

  7. CIC filter transfer function • 4 stage CIC frequency response for M=8 &16

  8. CIC Implement of an Decimation Filter

  9. CIC Implement of an interpolation Filter

  10. Register Growth

  11. 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

  12. Conclusions Disadvantage • Register widths can become large with “M” • If system with a fixed decimation ratio, need a designed filter to compensate for the CIC passband droop. • Frequency response is fully determined by M & L • A new CIC decimation filter with using “sharpening”

  13. End • Thank you for your attention

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