Exhibit 12.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

I, Peter Bauer, certify that:

1.	I have reviewed this annual report on Form 20-F/A of Infineon Technologies AG; and
2.	Based on my knowledge, this annual 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 annual report.

Date: May 18, 2010

/s/ Peter Bauer  

Peter Bauer 

Member of the Management Board and
Chief Executive Officer