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Nexxim Simulator >
Nexxim Component Models >
Nexxim Filters >
Pole Zero Band Reject Filter

Pole Zero Band Reject Filter

Netlist Syntax

An instance of a pole-zero band reject filter has the following Nexxim netlist syntax:

Axxx n1 n2 [FC=val] [BW=val] [GF=val] [R1=val] [X1=val] [R2=val] [X2=val] POLES=[rp1 ip1 ...] ZEROS=[rz1 iz1 ...] COMPONENT=polezero_bandreject_filter

n1 and n2 are the nodes connected to the filter. The entry COMPONENT=polezero_bandreject_filter is required.

**Pole-Zero Band Reject Filter Instance Parameters**
Parameter	Description	Units	Default
FC	Center frequency	Hz	0
BW	Bandwidth (3dB)	Hz	0
GF	Gain factor	None	1.0
R1	Resistive part of reference impedance at node 1	Ohm	50
X1	Reactive part of reference impedance at node 1	Ohm	0
R2	Resistive part of reference impedance at node 2	Ohm	50
X2	Reactive part of reference impedance at node 2	Ohm	0
*rp1, ip1* ... *rpN, ipN*	Real and imaginary parts of the poles	None	None
*rz1, iz1* ... *rzN, izN*	Real and imaginary parts of the zeros	None	None

Netlist Example

A22 1 2 FC=80e6 BW=101e4 POLES=[.1 -1.03 .2 .003]
+ ZEROS=[.05 -1.7] + COMPONENT=polezero_bandreject_filter

Notes

1. The element is specified using a transfer function given as the ratio of two expressions in the complex variable s. The bold brackets for the POLES and ZEROS entries are required.

The function of the device is expressed as:

GAIN ´ H(s)

The transfer function H(s) is specified by giving the coefficients:

where F = the analysis frequency and j=sqrt(-1)

2. The first coefficients in both numerator and denominator (a₀ and b₀) are constants, which must be specified even if they are zero. Thus, leading zeros are significant. In addition, intermediate zero-valued coefficients must be explicitly supplied in order to have the non-zero coefficients applied to the correct powers of s.

3. Trailing zeros are not significant, and are automatically removed.

4. At least one non-zero pole value must be supplied.

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