公开(公告)号：EP1943659A4

公开(公告)日：2013-12-18

申请号：EP05789951

申请日：2005-10-05

Applicant: ERICSSON TELEFON AB L M

Inventor： JACOBSSON HARALD ,  ASPEMYR LARS

IPC: H01J5/22 ,  H03B5/12 ,  H03J3/32 ,  H03J7/08

CPC classification number: H03J3/32 ,  H03B5/1215 ,  H03B5/1228 ,  H03B5/124 ,  H03B5/1278 ,  H03B5/1284

Abstract: The present invention relates to an oscillating circuit arrangement having a resonating arrangement with a first resonance frequency (coo) comprising a voltage controlled oscillator arrangement. It further comprises a tunable filter arrangement connected to the source node of said voltage controlled oscillator (VCO) arrangement. Said filter arrangement particularly comprises an equivalent current source resonating at a second resonance frequency c&thetas;f, the second resonance frequency being a multiple n, n=1 or 2 of said first resonance frequency (α>o), n being equal to the minimum number of switch transistors required for oscillation of said VCO arrangement. The filter arrangement particularly comprises an inductor connected in parallel with a capacitor, said capacitor being adapted to be tunable such that the phase noise of the resonating arrangement can be minimized through tuning of the filter arrangement.

公开(公告)号：EP1938448A4

公开(公告)日：2013-12-04

申请号：EP05788688

申请日：2005-09-27

Applicant: ERICSSON TELEFON AB L M

Inventor： ASPEMYR LARS ,  JACOBSSON HARALD

IPC: H03B5/24 ,  H03B5/12

CPC classification number: H03B5/1215 ,  H03B5/1228