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Ansoft Designer / Ansys Designer 在线帮助文档：

System Simulator >
System Component Models >
Digital Filters >
Finite Impulse Response Filter (FIR)

Finite Impulse Response Filter (FIR)

Property	Description	Units	Default	Range/Type
FILE	External filename	None	<Project>	String
TRAN	0 = Discard transient samples, 1 = Retain samples	None	0	[0, 1]/Integer
RIN1	Input 1 impedance	Ohm	Inf	(0, Inf]/Real
RIN2	Input 2 impedance	Ohm	Inf	(0, Inf]/Real
ROUT	Output impedance	Ohm	0	[0, Inf)/Real
Ports
Input1	Input1 signal (real)
Input2	Input2 clock signal (real, optional)
Output	The output signal (real)

Notes

1. This model implements FIR filter. The transfer function is of the form

2. The filter tap coefficients are provided in the data block in two-column XY DSP format. Each (X,Y) entry indicates the tap index and the corresponding tap coefficient (k, b_k).

3. The second input is optional. If it is connected, this model operates as an edge triggered device, with the trigger level 0.5V.

Netlist Form

FIR:NAME n1 n2 n3 FILE=”filename.dsp” [Rin1=val] [Rin2=val]

+ [Rout=val] [TRAN=val]

Netlist Example

FIR:1 1 2 3 FILE="firdata.dsp"

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