Exhibit 31.1



CERTIFICATION



I, James A. Fontaine, certify that:



1. I have reviewed this quarterly report on Form 10-Q of Microtune, 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;



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 officers and I are responsible for establishing and maintaining disclosure controls and procedures
(as defined in Exchange Act Rules 13a-14 and 15d-14) for the registrant and we are in the process of:



| | a) |  | designing such disclosure controls and procedures 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;
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| | b) |  | evaluating, on the basis of the findings of our Audit Committee inquiry concluded July 2003, the effectiveness of the registrants disclosure controls and procedures as of the
filing date of this quarterly report (the Evaluation Date); and
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| | c) |  | presenting in this quarterly report our conclusions about the effectiveness of the disclosure controls and procedures based on our evaluation as of the Evaluation Date;
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5. The registrants other certifying officers and I have
disclosed, based on my present knowledge from our ongoing evaluation, to the registrants auditors and the audit committee of registrants board of directors (or persons fulfilling the equivalent functions):



| | a) |  | significant deficiencies in the design or operation of internal controls which could adversely affect the registrants ability to record, process, summarize and report
financial data and have identified for the registrants auditors material weaknesses in internal controls; and
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| | b) |  | any fraud, whether or not material, that involves management or other employees who have a significant role in the registrants internal controls;
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6. The registrants other certifying officers and I have indicated in this quarterly
report whether or not there were significant changes in internal controls or in other factors that could significantly affect internal controls subsequent to the date of our most recent evaluation, including any corrective actions with regard to
significant deficiencies and material weaknesses.



Date: August 14, 2003



/s/ JAMES A.
FONTAINE

James A. Fontaine

Chief Executive Officer