(19)

(11)

EP 0 667 057 A1

(12)

(43) Date of publication: 16.08.1995 Bulletin 1995/33 (21) Application number: 94923969.0 (22) Date of filing: 15.07.1994

(51) International Patent Classification (IPC):  H03H 11/ 04( . ) H03H 11/ 46( . ) (86) International application number: PCT/US1994/008129 (87) International publication number: WO 1995/006977 (09.03.1995 Gazette 1995/11)

(84) Designated Contracting States: DE FR GB (30) Priority: 02.09.1993 US 19930116151 (71) Applicant: NATIONAL SEMICONDUCTOR CORPORATION Santa Clara, California 95052 (US)	(72) Inventor: HOBRECHT, Stephen, W. Los Altos, CA 95052 (US) (74) Representative: Horton, Andrew Robert Grant, et al  BOWLES HORTON Felden House Dower Mews High Street Berkhamsted Hertfordshire HP4 2BL Berkhamsted Hertfordshire HP4 2BL (GB)