Apple CEO Steve Jobs said the company was purchased to design system-on-chips for iPhones and iPods

Apple did not respond to inquiries about whether Dobberpuhl was still at Apple. Several sources said Dobberpuhl's departure was not recent and may have happened as long ago as last fall or possibly before that. Sources said they believe Dobberpuhl has joined Amarjit Gill, a former PA Semi principal, at Silicon Valley start-up Agnilux. Dobberpuhl isn't alone. Other key PA Semi team members have left Apple, including one of PA Semi's leading members, Mark Hayter.

Apple did not respond to inquiries about whether Dobberpuhl was still at Apple. Several sources said Dobberpuhl's departure was not recent and may have happened as long ago as last fall or possibly before that. Sources said they believe Dobberpuhl has joined Amarjit Gill, a former PA Semi principal, at Silicon Valley start-up Agnilux.

Dobberpuhl isn't alone. Other key PA Semi team members have left Apple, including one of PA Semi's leading members, Mark Hayter. It is not clear if the PA Semi team hired by Apple contributed to the design of the iPad's A4 chip, which Apple describes as a "custom-designed, high-performance, low-power system-on-a-chip."

Dan Dobberpuhl, the PA Semi founder and CEO who came to Apple with the acquisition of his company, has apparently jumped ship to work at a chip-related start-up.

Apple acquired PA Semi in April of 2008 for $278 million. At the time, Apple CEO Steve Jobs said the company was purchased to design system-on-chips for iPhones and iPods. Dobberpuhl was the leader of the team Apple hired.

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