0001285081-05-000072 4 1 20050819 20050823 20050823 SILICON LABORATORIES INC 0001038074 3674 742793174 DE 1231 4635 BOSTON LN AUSTIN TX 78735 4635 BOSTON LANE AUSTIN TX 78735 SOOCH NAVDEEP S 0001134855 4 34 000-29823 051042962 5124168500 4635 BOSTON LANE AUSTIN TX 78735 4 1 primary_doc.xml PRIMARY DOCUMENT