CTLE Fitter

Fit poles and zeros to CTLE transfer functions

Since R2022a

Description

The CTLE Fitter app fits poles, zeros, and gains to CTLE transfer functions. The app also allows an organized approach to preprocess CTLE data sets information. The app then fits the parameters using the rational (RF Toolbox) function from the RF Toolbox™.

Using the app, you can:

• Easily fit poles and zeros to frequency domain CTLE transfer functions.

• Easily input GPZ matrix to the block.

• Export the script to base workspace.

×

Open the CTLE Fitter App

• MATLAB^® command prompt: Enter ctlefitter.

• SerDes Designer app: Open the CTLE block parameters dialog box and click the Launch CTLE Fitter App button.

• Simulink^® model: Open the CTLE block parameters dialog box and click the Launch CTLE Fitter App button.

Examples

• Find Zeros, Poles, and Gains for CTLE from Transfer Function

Programmatic Use

ctlefitter

ctlefitter opens a new session of the CTLE Fitter app.

More About

Import Data

You can import data to the CTLE Fitter app in two ways:

• From CSV file — The data in the CSV file must have specific headers and data arrangement.

  freq	<data_1>	<data_2>	<data_1>	<data_2>	<data_1>	<data_2>
  <value>	<value>	<value>	<value>	<value>	<value>	<value>
  <value>	<value>	<value>	<value>	<value>	<value>	<value>

  <data_1> and <data_2> column pairs can only be one of the following options:

  • real and imag,

  • db and phaseDeg,

  • db and phaseRad,

  • mag and phaseDeg,

  • mag and phaseRad.

  The CSV file must contain the first three columns. The subsequent column pairs are optional. The first column must contain frequencies. The subsequent column pairs can only have one set of data format. For example:

  freq	db	phaseDeg	db	phaseDeg
  <value>	<value>	<value>	<value>	<value>

• From base workspace — You can create the base workspace variables by reading the data from a CSV file.

  fn = 'ExampleCTLEDatadBPhaseDeg.csv';
  [f,H]=ctlefit.readcsv(fn);
  MyVar = [f,H];

Slice Select

Using the CTLE block or serdes.CTLE System object™, you can define which corner of a 3-D GPZ matrix to use during parameter selection.

When you are fitting the CTLE transfer function, you can either replace the current slice in the GPZ matrix or add a new slice to the GPZ matrix.

Version History

Introduced in R2022a

R2023b: Slice Select

you can now select which slice, family, or corner of a 3-D GPZ matrix to use during CTLE configuration.