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System Component Models >
Fixed-Point >
Fixed-Point IIR Filter (FXTIIR)

Fixed-Point IIR Filter (FXTIIR)

Property	Description	Units	Default	Range/type
useInAsOut	Use the input precision as the output precision: 1 for used, 0 for not used	None	1	[0, 1]/Integer
coefW	Word length of fixed point coefficient	None	32	[1, 32]/Integer
coefD	Precision of the fixed-point coefficient	None	0	[0, 32]/Integer
outW	Word length of the output fixed-point number	None	32	[0, 32]/Integer
outD	Precision of the output fixed-point number	None	0	[0, 32]/Integer
ovf	Overflow characteristic: 0 for wrapped, 1 for saturate, 2 for zero saturate	None	0	[0, 2]/Integer
quant	Quantization characteristic: 0 for truncated, 1 for rounded, 2 for truncated 0	None	0	[0, 2]/Integer
file	Name of the external file	None	Required	String
ArithType	Arithmetic type: 0 for signed, 1 for unsigned	None	0	[0, 1]/Integer
Rin	Input impedance	Ohm	Inf	(0, Inf]/Real
Rout	Output impedance	Ohm	0	[0, Inf)/Real
Ports
Input	Input signal (fixed point real number)
Output	Output signal (fixed point real number)

Limits

1. outW > outD, coefW > coefD for signed arithmetic

Notes

1. This model implements IIR filter based on the following system function:
or equivalently, the difference equation:
The system parameters (a_k) and (b_k) and are provided by a two-column XY format data block in an external file. The first column is the (a_k) value. The second column is the (b_k) value. The coefficients are floating point numbers. They are converted to fixed point number according to the parameters: coefW, coefD, ovf, quant, arithtype. The format of the output is specified by the parameters: outW, outD, ovf, quant, arithtype. Note that if useInAsOut is set to 1, the format of the fixed output number is set to be the format of the input fixed point number. That is to say, the values outW, outD, ovf, quant, arithtype are ignored in this case.

2. The following plot shows the relationship between word length and precision.

Netlist Form

FXTIIR:NAME n1 n2 [useInAsOut=val] [coefW=val] [coefD=val] [outW=val] [outD=val] [ovf=val] [quant=val] [file=val] [arithtype=val] [Rin=val] [Rout=val]

Netlist Example

FXTIIR:1 1 2 useInAsOut=0 coefW=16 coefD=4 outW=24 outD=8 ovf=1 quant=1 file=”filename”

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