IP Library › Granted Patent US 7,772,932
Granted Patent B1
US 7,772,932 · App. 11/952,027 · Granted Aug 10, 2010

Quadrature local oscillator generation for direct conversion radio transceiver

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Quick Facts
Patent No.
US 7,772,932
App. No.
11/952,027
Granted
Aug 10, 2010
Kind
B1
Abstract

A method of generating a quadrature local oscillator (LO) frequencies is provided. In this method, a voltage-controlled oscillator (VCO) frequency can be mixed with a divided version of the VCO frequency to generate mixed signals. A lower sideband of the mixed signals can be selected for the quadrature LO frequencies to minimize the occurrence of spurs. Notably, the divided version is 1/N of the VCO frequency and the VCO frequency is a radio frequency (RF) channel frequency times a ratio N/(N−1).

Claims (4)

1. A method of generating a quadrature local oscillator (LO) frequency, the method comprising:

mixing a voltage-controlled oscillator (VCO) frequency with a divided version of the VCO frequency to generate a mixed signal; and

selecting a lower sideband of the mixed signal for the quadrature LO frequency,

wherein the divided version is 1/N of the VCO frequency and the VCO frequency is a radio frequency (RF) channel frequency times a ratio N/(N−1).

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 20, 2012
From: QUALCOMM ATHEROS, INC.
To: QUALCOMM INCORPORATED
Reel/Frame 029328/0052 →
MERGER Recorded Jul 15, 2011
From: ATHEROS COMMUNICATIONS, INC.
To: QUALCOMM ATHEROS, INC.
Reel/Frame 026599/0360 →