(19)

(11)

EP 0 932 931 A2

(12)

(43) Date of publication: 04.08.1999 Bulletin 1999/31 (21) Application number: 97909825.0 (22) Date of filing: 20.10.1997

(51) International Patent Classification (IPC):  H03B 19/ 14( . ) (86) International application number: PCT/SE1997/001754 (87) International publication number: WO 1998/018201 (30.04.1998 Gazette 1998/17)

(84) Designated Contracting States: DE ES FR GB IT NL SE (30) Priority: 21.10.1996 SE 19960003876 (71) Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (publ) 126 25 Stockholm (SE)	(72) Inventor: ZIRATH, Hans, Göran, Herbert S-431 36 Mölndal (SE) (74) Representative: Norin, Klas, et al  Ericsson Radio Systems AB Common Patent Department 164 80 Stockholm 164 80 Stockholm (SE)