(19)

(11)

EP 0 474 669 A1

(12)

(43) Date of publication: 18.03.1992 Bulletin 1992/12 (21) Application number: 90907660.0 (22) Date of filing: 18.05.1990

(51) International Patent Classification (IPC):  H03B 5/ 32( . ) H03B 5/ 36( . ) (86) International application number: PCT/US1990/002705 (87) International publication number: WO 1990/015477 (13.12.1990 Gazette 1990/28)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 30.05.1989 US 19890358059 (71) Applicant: MOTOROLA, INC. Schaumburg, IL 60196 (US)	(72) Inventors: HIGGINS, Robert, Jacob, Jr. Sunrise, FL 33322 (US) OOMS, William, Jay Chandler, AZ 85224 (US) IRWIN, James, Stuart Bastrop, TX 78602 (US) (74) Representative: Lupton, Frederick, et al  Motorola European Intellectual Property Operations Jays Close Viables Industrial Estate Basingstoke, Hants RG22 4PD Basingstoke, Hants RG22 4PD (GB)