公开(公告)号：DE60334568D1

公开(公告)日：2010-11-25

申请号：DE60334568

申请日：2003-11-14

Applicant: QUALCOMM INC

Inventor： GARD KEVIN ,  SEGORIA ANTHONY ,  SAHOTA GURKANWAL KAMAL ,  PERSICO CHARLES

IPC: H04B1/30

公开(公告)号：AU2003287661A1

公开(公告)日：2004-06-15

申请号：AU2003287661

申请日：2003-11-14

Applicant: QUALCOMM INC

Inventor： SEGORIA ANTHONY ,  SAHOTA GURKANWAL KAMAL ,  PERSICO CHARLES ,  GARD KEVIN

IPC: H04B1/30

Abstract: Techniques to reduce LO leakage by controlling the amplitude of LO signal based on the level of output signal after the frequency conversion process. An LO generator receives a VCO signal and generates an LO signal having a variable amplitude and a frequency that is related to the frequency of the VCO signal. A variable gain amplifier receives a control signal and adjusts the amplitude of the LO signal based on the control signal. The variable amplitude LO signal is used for frequency upconversion (e.g., direction upconversion) of an input signal (e.g., at baseband) to obtain an output signal (e.g., at RF). The relationship between LO signal amplitude and output signal level may be defined by a particular transfer function. In general, the LO signal is set higher for higher output signal level and is reduced proportionally for lower output signal level.

公开(公告)号：AT484888T

公开(公告)日：2010-10-15

申请号：AT03781962

申请日：2003-11-14

Applicant: QUALCOMM INC

Inventor： GARD KEVIN ,  SEGORIA ANTHONY ,  SAHOTA GURKANWAL ,  PERSICO CHARLES

IPC: H04B1/30

Abstract: Techniques to reduce LO leakage by controlling the amplitude of LO signal based on the level of output signal after the frequency conversion process. An LO generator receives a VCO signal and generates an LO signal having a variable amplitude and a frequency that is related to the frequency of the VCO signal. A variable gain amplifier receives a control signal and adjusts the amplitude of the LO signal based on the control signal. The variable amplitude LO signal is used for frequency upconversion (e.g., direction upconversion) of an input signal (e.g., at baseband) to obtain an output signal (e.g., at RF). The relationship between LO signal amplitude and output signal level may be defined by a particular transfer function. In general, the LO signal is set higher for higher output signal level and is reduced proportionally for lower output signal level.