Biquad IIR Filter Core :: Overview

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Specifications

- IIR filter with two poles and two zeros
- Data width set by user
- Coefficient width set by user up to 16 bits
- Wishbone interface for read and write of filter coefficient registers
- Multiple filters can be combined to form filters with more than two poles and zeros

Description

The difference equation for the biquad filter is:

y[n] = b10*x[n] + b11*x[n-1] + b12*x[n-2] + a11*y[n-1] + a12*y[n-2]

This equation is implemented as shown below:

IMAGE: bquad_blk.gif

FILE: bquad_blk.gif
DESCRIPTION:

Synthesis

Synthesized with Synopsys FPGA Express version 2000.11-FE3.5.

If you use this core please let me know.