Keysight U8903B User Manual page 563

The IIR filter transfer function, H(z), is defined as:
NOTE
H(z)
where z = complex variable, N = number of sections, x = section number
You may set up to 256 coefficients for the FIR filter type, and up to 36 sections for the IIR
filter. The number of FIR coefficients must not be less than four, while the minimum
number of sections allowed for IIR is one (seven coefficients). The delay is specified in the
form of samples and within the range of 0 to 65535.
Keysight U8903B User's Guide
N
⎛
B x 0 [ ] B x 1 [ ]z +
⎜
∏ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
= Gain x
⎜
A x 0 [ ] A x 1 [ ]z +
⎝
x = 1
–1 –1
⎞
+ B x 2 [ ]z
⎟
⎟
–1 –1
+ A x 2 [ ]z
⎠
Appendixes A
563