EXHIBIT 31.2
 CERTIFICATION
  1.
    
    I have reviewed this Quarterly Report on Form 10-Q of Conexant Systems, Inc.;2.
    
    Based on my knowledge, this Quarterly Report does not contain any untrue statement of a
material fact or omit to state a material fact necessary to make the statements made, in light
of the circumstances under which such statements were made, not misleading with respect to the
period covered by this Quarterly Report;3.
    
    Based on my knowledge, the financial statements, and other financial information included in
this Quarterly Report, fairly present in all material respects the financial condition,
results of operations and cash flows of the registrant as of, and for, the periods presented
in this Quarterly Report;4.
    
    The registrants other certifying officer and I are responsible for establishing and
maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and
15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules
13a-15(f) and 15d-15(f)) for the registrant and have:a. designed such disclosure controls and procedures, or caused such disclosure controls and
procedures to be designed under our supervision, to ensure that material information relating to
the registrant, including its consolidated subsidiaries, is made known to us by others within
those entities, particularly during the period in which this Quarterly Report is being prepared;b. designed such internal control over financial reporting, or caused such internal control over
financial reporting to be designed under our supervision, to provide reasonable assurance
regarding the reliability of financial reporting and the preparation of financial statements for
external purposes in accordance with generally accepted accounting principles;c. evaluated the effectiveness of the registrants disclosure controls and procedures and
presented in this Quarterly Report our conclusions about the effectiveness of the disclosure
controls and procedures, as of the end of the period covered by this Quarterly Report based on
such evaluation; andd. disclosed in this Quarterly Report any change in the registrants internal control over
financial reporting that occurred during the registrants most recent fiscal quarter that has
materially affected, or is reasonably likely to materially affect, the registrants internal
control over financial reporting; and5.
    
    The registrants other certifying officer and I have disclosed, based on our most recent
evaluation of internal control over financial reporting, to the registrants auditors and the
audit committee of the registrants board of directors (or persons performing the equivalent
functions):a. all significant deficiencies and material weaknesses in the design or operation of internal
control over financial reporting which are reasonably likely to adversely affect the
registrants ability to record, process, summarize and report financial information; andb. any fraud, whether or not material, that involves management or other employees who have a
significant role in the registrants internal control over financial reporting.
  /s/ KAREN ROSCHERKaren RoscherSenior Vice President and Chief Financial Officer