Local oscillator signal generator with automatic quadrature phase imbalance compensation

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(11)

EP 2 797 234 A8

(12)	CORRECTED EUROPEAN PATENT APPLICATION
	Note: Bibliography reflects the latest situation

(15)	Correction information:
	Corrected version no 1 (W1 A1)

(48)	Corrigendum issued on:
	03.12.2014 Bulletin 2014/49

(88)	Date of publication A3:
	29.10.2014 Bulletin 2014/44

(43)	Date of publication:
	29.10.2014 Bulletin 2014/44

(21)	Application number: 14175067.9

(22)	Date of filing: 18.08.2009

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International Patent Classification (IPC):

H03L 7/081^(2006.01)

H03D 3/00^(2006.01)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

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Priority:

18.08.2008 US 193693

(62)	Application number of the earlier application in accordance with Art. 76 EPC:
	09791628.2 / 2327159

(71)	Applicant: Qualcomm Incorporated
	San Diego, CA 92121-1714 (US)

(72)	Inventors:
	Qiao, Dongjiang San Diego, CA California 92121 (US) Bossu, Frederic San Diego, 92121 (US)

(74)	Representative: Roche, Dermot et al
	Tomkins & Co. 5 Dartmouth Road Dublin 6 Dublin 6 (IE)


	Remarks:
	This application was filed on 30-06-2014 as a divisional application to the application mentioned under INID code 62.

(54)	Local oscillator signal generator with automatic quadrature phase imbalance compensation

(57) A local oscillator circuit, comprising a timing circuit configured to provide an in phase signal and a quadrature phase signal; a delay circuit configured to delay the in phase signal, thereby producing a delayed in phase signal; and a feedback circuit configured to receive the delayed in-phase and quadrature signals and provide a bias adjustment signal to the delay circuit to control a delay time of the delay circuit.