**Exhibit 31. 1**

 

CERTIFICATION OF CHIEF EXECUTIVE OFFICER PURSUANT TO SECTION 302 

 

**CERTIFICATION OF CHIEF EXECUTIVE OFFICER PURSUANT TO**

**SECURITIES EXCHANGE ACT RULES 13a-14(a) and 15d-14(a), AS ADOPTED PURSUANT TO**

**SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002**

 

I, Richard K. Williams, certify that: 

 

1. I have reviewed this report on Form 10-Q of Advanced Analogic Technologies Incorporated, a Delaware corporation, for the period ended September 30, 2005, as filed with the Securities and Exchange Commission; 

 

2. Based on my knowledge, this report does not contain any untrue statementof 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 report; 

 

3. Based on my knowledge, the financial statements, and other financialinformation included in this 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 report; 

 

4. The registrant’s other certifying officer(s) and I are responsiblefor establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have: 

 

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under oursupervision, 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 report is being prepared;

 

(b) [Intentionally omitted pursuant to SECrules] 

 

(c) Evaluated the effectiveness of theregistrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

 

(d) Disclosed in this report any change inthe registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or isreasonably likely to materially affect, the registrant’s internal control over financial reporting; and 

 

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financialreporting, 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 overfinancial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and 

 

(b) Any fraud, whether or not material, that involves management or other employees who have a significantrole in the registrant’s internal control over financial reporting. 

 

Date:November 9, 2005