(19)

(11)

EP 1 805 893 A1

(12)

(43) Date of publication: 11.07.2007 Bulletin 2007/28 (21) Application number: 05857339.5 (22) Date of filing: 12.09.2005

(51) International Patent Classification (IPC):  H03K 17/16(2006.01) G05F 3/26(2006.01) (86) International application number: PCT/GB2005/050153 (87) International publication number: WO 2006/087508 (24.08.2006 Gazette 2006/34)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR (30) Priority: 11.10.2004 GB 0422524 03.12.2004 US 633265 P (71) Applicant: Frontier Silicon Limited Cambridge Cambridgeshire CB2 4LJ (GB)	(72) Inventor: Taylor, Clive Roland c/o Frontier Silicon Limited Cambridge Cambridgeshire CB2 4LJ (GB) (74) Representative: Martin, Philip John  Marks & Clerk 66-68 Hills Road Cambridge CB2 1LA Cambridge CB2 1LA (GB)