Silicon Laboratories (SLAB)

We have performed an evaluation under the supervision and with the participation of our management, including our Chief Executive Officer (CEO) and Chief Financial Officer (CFO), of the effectiveness of our disclosure controls and procedures, as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934 (the Exchange Act).  Based on that evaluation, our management, including our CEO and CFO, concluded that our disclosure controls and procedures were effective as of April 4, 2009 to provide reasonable assurance that information required to be disclosed by us in the reports filed or submitted by us under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms.  Such disclosure controls and procedures include controls and procedures designed to ensure that information required to be disclosed is accumulated and communicated to our management, including our CEO and CFO, to allow timely decisions regarding required disclosures.  There was no change in our internal controls during the fiscal quarter ended April 4, 2009 that materially affected, or is reasonably likely to materially affect, our internal controls over financial reporting.

Part II.  Other Information

We have performed an evaluation under the supervision and with the participation of our management, including our Chief Executive Officer (CEO) and Chief Financial Officer (CFO), of the effectiveness of our disclosure controls and procedures, as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934 (the Exchange Act).  Based on that evaluation, our management, including our CEO and CFO, concluded that our disclosure controls and procedures were effective as of October 4, 2008 to provide reasonable assurance that information required to be disclosed by us in the reports filed or submitted by us under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms.  There was no change in our internal controls during the fiscal quarter ended October 4, 2008 that materially affected, or is reasonably likely to materially affect, our internal controls over financial reporting.

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We have performed an evaluation under the supervision and with the participation of our management, including our Chief Executive Officer (CEO) and Chief Financial Officer (CFO), of the effectiveness of our disclosure controls and procedures, as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934 (the Exchange Act).  Based on that evaluation, our management, including our CEO and CFO, concluded that our disclosure controls and procedures were effective as of July 5, 2008 to provide reasonable assurance that information required to be disclosed by us in the reports filed or submitted by us under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms.  There was no change in our internal controls during the fiscal quarter ended July 5, 2008 that materially affected, or is reasonably likely to materially affect, our internal controls over financial reporting.

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We have performed an evaluation under the supervision and with the participation of our management, including our Chief Executive Officer (CEO) and Chief Financial Officer (CFO), of the effectiveness of our disclosure controls and procedures, as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934 (the Exchange Act).  Based on that evaluation, our management, including our CEO and CFO, concluded that our disclosure controls and procedures were effective as of April 5, 2008 to provide reasonable assurance that information required to be disclosed by us in the reports filed or submitted by us under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms.  There was no change in our internal controls during the fiscal quarter ended April 5, 2008 that materially affected, or is reasonably likely to materially affect, our internal controls over financial reporting.

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Item 9A.    Controls and Procedures

        We have performed an evaluation under the supervision and with the participation of our management, including our Chief Executive Officer (CEO) and Chief Financial Officer (CFO), of the effectiveness of our disclosure controls and procedures, as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934 (the Exchange Act). Based on that evaluation, our management, including our CEO and CFO, concluded that our disclosure controls and procedures were effective as of December 29, 2007 to provide reasonable assurance that information required to be disclosed by us in the reports filed or submitted by us under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC's rules and forms. There was no change in our internal controls during the fiscal quarter ended December 29, 2007 that materially affected, or is reasonably likely to materially affect, our internal controls over financial reporting.

Management's Report on Internal Control over Financial Reporting

        Our management is responsible for establishing and maintaining adequate internal control over financial reporting. Our internal control system was designed to provide reasonable assurance to our management and Board of Directors regarding the preparation and fair presentation of published financial statements.

        Our management assessed the effectiveness of our internal control over financial reporting as of December 29, 2007. In making this assessment, it used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control—Integrated Framework. Based on our assessment we believe that, as of December 29, 2007, our internal control over financial reporting is effective based on those criteria.

        Our independent registered public accounting firm, Ernst & Young LLP, issued an attestation report on our internal control over financial reporting. This report appears on page F-1.

Item 9A.    Controls and Procedures

        We have performed an evaluation under the supervision and with the participation of our management, including our Chief Executive Officer (CEO) and Chief
Financial Officer (CFO), of the effectiveness of our disclosure controls and procedures, as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934 (the Exchange Act).
Based on that evaluation, our management, including our CEO and CFO, concluded that our disclosure controls and procedures were effective as of December 29, 2007 to provide reasonable assurance
that information required to be disclosed by us in the reports filed or submitted by us under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the
SEC's rules and forms. There was no change in our internal controls during the fiscal quarter ended December 29, 2007 that materially affected, or is reasonably likely to materially affect, our
internal controls over financial reporting.

Management's Report on Internal Control over Financial Reporting

        Our management is responsible for establishing and maintaining adequate internal control over financial reporting. Our internal control system was designed to
provide reasonable assurance to our management and Board of Directors regarding the preparation and fair presentation of published financial statements.

        Our
management assessed the effectiveness of our internal control over financial reporting as of December 29, 2007. In making this assessment, it used the criteria set forth by
the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control—Integrated Framework. Based on our
assessment we believe that, as of December 29, 2007, our internal control over financial reporting is effective based on those criteria.

        Our
independent registered public accounting firm, Ernst & Young LLP, issued an attestation report on our internal control over financial reporting. This report appears on
page F-1.

     We have performed an evaluation under the supervision and with the participation of our management, including our Chief Executive Officer (CEO) and Chief Financial Officer (CFO), of the effectiveness of our disclosure controls and procedures, as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934 (the Exchange Act).  Based on that evaluation, our management, including our CEO and CFO, concluded that our disclosure controls and procedures were effective as of September 29, 2007 to provide reasonable assurance that information required to be disclosed by us in the reports filed or submitted by us under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms.  There were no changes in our internal controls during the fiscal quarter ended September 29, 2007 that materially affected, or are reasonably likely to materially affect, our internal controls over financial reporting.

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     We have performed an evaluation under the supervision and with the participation of our management, including our Chief Executive Officer (CEO) and Chief Financial Officer (CFO), of the effectiveness of our disclosure controls and procedures, as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934 (the Exchange Act).  Based on that evaluation, our management, including our CEO and CFO, concluded that our disclosure controls and procedures were effective as of June 30, 2007 to provide reasonable assurance that information required to be disclosed by us in the reports filed or submitted by us under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms.

     In April 2007, we implemented a global enterprise resource planning (ERP) system to help us improve our planning and management processes.  The migration of certain legacy systems to the new ERP system required us to make significant changes to our internal controls over financial reporting.  We believe we have taken the necessary steps to monitor and maintain appropriate internal controls during this implementation.  There were no other changes in our internal controls during the fiscal quarter ended June 30, 2007 that materially affected, or are reasonably likely to materially affect, our internal controls over financial reporting.

Part II.  Other Information

     We have performed an evaluation under the supervision and with the participation of our management, including our Chief Executive Officer (CEO) and Chief Financial Officer (CFO), of the effectiveness of our disclosure controls and procedures, as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934 (the Exchange Act).  Based on that evaluation, our management, including our CEO and CFO, concluded that our disclosure controls and procedures were effective as of March 31, 2007 to provide reasonable assurance that information required to be disclosed by us in the reports filed or submitted by us under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms.  There was no change in our internal controls during the fiscal quarter ended March 31, 2007 that materially affected, or is reasonably likely to materially affect, our internal controls over financial reporting.

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     We have performed an evaluation under the supervision and with the participation of our management, including our Chief Executive Officer (CEO) and Chief Financial Officer (CFO), of the effectiveness of our disclosure controls and procedures, as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934 (the Exchange Act).  Based on that evaluation, our management, including our CEO and CFO, concluded that our disclosure controls and procedures were effective as of September 30, 2006 to provide reasonable assurance that information required to be disclosed by us in the reports filed or submitted by us under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms.  There was no change in our internal controls during the fiscal quarter ended September 30, 2006 that materially affected, or is reasonably likely to materially affect, our internal controls over financial reporting.

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Part II.  Other Information

     We have performed an evaluation under the supervision and with the participation of our management, including our Chief Executive Officer (CEO) and Chief Financial Officer (CFO), of the effectiveness of our disclosure controls and procedures, as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934 (the Exchange Act).  Based on that evaluation, our management, including our CEO and CFO, concluded that our disclosure controls and procedures were effective as of July 1, 2006 to provide reasonable assurance that information required to be disclosed by us in the reports filed or submitted by us under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms.  There was no change in our internal controls during the fiscal quarter ended July 1, 2006 that materially affected, or is reasonably likely to materially affect, our internal controls over financial reporting.

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PART II.  OTHER INFORMATION

We have performed an evaluation under the supervision and with the participation of our management, including our Chief Executive Officer (CEO) and Chief Financial Officer (CFO), of the effectiveness of our disclosure controls and procedures, as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934 (the Exchange Act). Based on that evaluation, our management, including our CEO and CFO, concluded that our disclosure controls and procedures were effective as of April 1, 2006 to provide reasonable assurance that information required to be disclosed by us in the reports filed or submitted by us under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms. There was no change in our internal controls during the fiscal quarter ended April 1, 2006 that materially affected, or is reasonably likely to materially affect, our internal controls over financial reporting.

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We have performed an evaluation under the supervision and with the participation of our management, including our Chief Executive Officer (CEO) and Chief Financial Officer (CFO), of the effectiveness of our disclosure controls and procedures, as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934 (the Exchange Act). Based on that evaluation, our management, including our CEO and CFO, concluded that our disclosure controls and procedures were effective as of December 31, 2005 to provide reasonable assurance that information required to be disclosed by us in the reports filed or submitted by us under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms. There was no change in our internal controls during the fiscal quarter ended December 31, 2005 that materially affected, or is reasonably likely to materially affect, our internal controls over financial reporting.

Management’s Report on Internal Control over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting. Our internal control system was designed to provide reasonable assurance to our management and board of directors regarding the preparation and fair presentation of published financial statements.

Our management assessed the effectiveness of our internal control over financial reporting as of December 31, 2005. In making this assessment, it used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control—Integrated Framework. Based on our assessment we believe that, as of December 31, 2005, our internal control over financial reporting is effective based on those criteria.

Our independent registered public accounting firm, Ernst & Young LLP, issued an attestation report on our assessment of our internal control over financial reporting. This report appears on page F-1.

We have performed an evaluation under the supervision and with the participation of our management, including our Chief Executive Officer (CEO) and Chief Financial Officer (CFO), of the effectiveness of our disclosure controls and procedures, as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934 (the Exchange Act). Based on that evaluation, our management, including our CEO and CFO, concluded that our disclosure controls and procedures were effective as of December 31, 2005 to provide reasonable assurance that information required to be disclosed by us in the reports filed or submitted by us under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms. There was no change in our internal controls during the fiscal quarter ended December 31, 2005 that materially affected, or is reasonably likely to materially affect, our internal controls over financial reporting.

Management’s Report on Internal Control over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting. Our internal control system was designed to provide reasonable assurance to our management and board of directors regarding the preparation and fair presentation of published financial statements.

Our management assessed the effectiveness of our internal control over financial reporting as of December 31, 2005. In making this assessment, it used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control—Integrated Framework. Based on our assessment we believe that, as of December 31, 2005, our internal control over financial reporting is effective based on those criteria.

Our independent registered public accounting firm, Ernst & Young LLP, issued an attestation report on our assessment of our internal control over financial reporting. This report appears on page F-1.

We have performed an evaluation under the supervision and with the participation of our management, including our Chief Executive Officer (CEO) and Chief Financial Officer (CFO), of the effectiveness of our disclosure controls and procedures, as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934 (the Exchange Act).  Based on that evaluation, our management, including our CEO and CFO, concluded that our disclosure controls and procedures were effective as of October 1, 2005 to provide reasonable assurance that information required to be disclosed by us in the reports filed or submitted by us under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms.  There was no change in our internal controls during the fiscal quarter ended October 1, 2005 that materially affected, or is reasonably likely to materially affect, our internal controls over financial reporting.

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ITEM 4.  CONTROLS AND PROCEDURES

We have performed an evaluation under the supervision and with the participation of our management, including our Chief Executive Officer (CEO) and Chief Financial Officer (CFO), of the effectiveness of our disclosure controls and procedures, as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934 (the Exchange Act).  Based on that evaluation, our management, including our CEO and CFO, concluded that our disclosure controls and procedures were effective as of July 2, 2005 to provide reasonable assurance that information required to be disclosed by us in the reports filed or submitted by us under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms.  There was no change in our internal controls during the fiscal quarter ended July 2, 2005 that materially affected, or is reasonably likely to materially affect, our internal controls over financial reporting.

36

We have performed an evaluation under the supervision and with the participation of our management, including our Chief Executive Officer (CEO) and Chief Financial Officer (CFO), of the effectiveness of our disclosure controls and procedures, as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934 (the Exchange Act).  Based on that evaluation, our management, including our CEO and CFO, concluded that our disclosure controls and procedures were effective as of April 2, 2005 to provide reasonable assurance that information required to be disclosed by us in the reports filed or submitted by us under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms.  There was no change in our internal controls during the fiscal quarter ended April 2, 2005 that materially affected, or is reasonably likely to materially affect, our internal controls over financial reporting.

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