Appendixes
Keysight U8903A User’s Guide
163
Example of the IIR filter file format:
#Type: IIR
#Delay: 10
#Sections: [0.021888116917017919, 1, –1.8522189864275376,
0.93977145409560914, 1, 2, 1] [0.020670375338350408, 1,
–1.7491711051903651, 0.83185260654376658, 1, 2, 1]
The coefficients of the IIR filter are described as follows.
where A
x
= Denominator and B
x
= Numerator
0.021888116917017919
// Section 1: Gain
1
1 // Section 1: A
1
[0]
–1.8522189864275376
// Section 1: A
1
[1]
0.93977145409560914
// Section 1: A
1
[2]
1
// Section 1: B
1
[0]
2
// Section 1: B
1
[1]
1
// Section 1: B
1
[2]
0.020670375338350408
// Section 2: Gain
2
1
// Section 2: A
2
[0]
–1.7491711051903651 // Section 2: A
2
[1]
0.83185260654376658
// Section 2: A
2
[2]
1
// Section 2: B
2
[0]
2
// Section 2: B
2
[1]
1
// Section 2: B
2
[2]
NOTE
The IIR filter transfer function,
H
(
z
), is defined as:
where z = complex variable, N = number of sections, x = section number
H(z) =
Gainx
Bx
0
[ ]
Bx
1
[ ]
z
1
–
Bx
2
[ ]
z
2
–
+
+
Ax
0
[ ]
Ax
1
[ ]
z
1
–
Ax
2
[ ]
z
2
–
+
+
----------------------------------------------------------
x = 1
N
∏
Summary of Contents for U8903A
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