Wall Street Journal reports that PortalPlayer, whose chip powered the hit IPod is going public sometime this week, selling 6.25 million shares at $11 to $13 a share. Citigroup Inc. and Credit Suisse Group’s Credit Suisse First Boston are leading the IPO. “It’s on everybody’s radar screen now,” Sal Morreale, who tracks IPOs for Cantor Fitzgerald LP in Los Angeles told Wall Street Journal. “People want a piece of the iPod, and they haven’t had too many chances.”