Cascaded Integrator-Comb (CIC) Filter

Overview

Cascaded Integrator-Comb (CIC) filters, also known as Hogenauer filters, are used to achieve arbitrary and large sample rate changes in digital systems. These filters are used as decimation or interpolation filters and can be efficiently implemented without multipliers, utilizing only adders and subtractors.

A CIC filter is typically used in applications where the system sample rate is much larger than the bandwidth occupied by the signal. They are commonly used to build Digital Down Converters (DDCs) and Digital Up Converters (DUCs). Some applications that use the CIC filter include software designed radios, cable modems, satellite receivers, 3G base stations, and radar systems.

Lattice provides a widely parameterizable CIC filter that supports multiple channels with run-time programmable rates and differential delay parameters.

Features

• 1-32-bit Input Data Width
• 1-8 Cascaded Stages
• 1-4 Cycles Differential Delay, Run-time Programmable for Both Decimation and Interpolation
• 2-16,384 Decimation and Interpolation Sampling Rate Factor, Run-time Programmable Rates for Both Decimationand Interpolation
• Multi-channel (up to 4 Channels) Support for Both Decimation and Interpolation
• Fully Synchronous, Single-clock Design

Performance and Resource Utilization

1. Performance and utilization data are generated using an LFE3-95E-8FN672CES device, with Lattice Diamond 1.0 and Synplify Pro D-2009.12L-1 software. Performance may vary when using a different software version or targeting a different device density or speed grade within the LatticeECP2M family.

1. Performance and utilization data are generated using an LFE2M-35E-7F672C device, with Lattice Diamond 1.0 and Synplify Pro D-2009.12L-1 software. Performance may vary when using a different software version or targeting a different device density or speed grade within the LatticeECP2M family.

1. Performance and utilization data are generated using an LFE2-50E-7F672C device, with Lattice Diamond 1.0 and Synplify Pro D-2009.12L-1 software. Performance may vary when using a different software version or targeting a different device density or speed grade within the LatticeECP2 family.

1. Performance and utilization data are generated using an LFECP33E-5F672C device, with Lattice Diamond 1.0 and Synplify Pro D-2009.12L-1 software. Performance may vary when using a different software version or targeting a different device density or speed grade within the LatticeECP/EC family.

1. Performance and utilization data are generated using an LFSC3GA25E-7F900C device, with Lattice Diamond 1.0 and Synplify Pro D-2009.12L-1 software. Performance may vary when using a different software version or targeting a different device density or speed grade within the LatticeSC family.

1. Performance and utilization data are generated using an LFXP2-17E-7F484C device, with Lattice Diamond 1.0 and Synplify Pro D-2009.12L-1 software. Performance may vary when using a different software version or targeting a different device density or speed grade within the LatticeXP2 family.

1. Performance and utilization data are generated using an LFXP20E-5F484C device, with Lattice Diamond 1.0 and Synplify Pro D-2009.12L-1 software. When using this IP core in a different density, speed, or grade within the LatticeXP family, performance and utilization may vary.

Ordering Information

IP Version: 3.1
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