The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 03, 2013
Filed:
Nov. 26, 2008
Kevin Gard, Raleigh, NC (US);
Anthony Segoria, San Diego, CA (US);
Gurkanwal (Kamal) Sahota, San Diego, CA (US);
Charles Persico, Rancho Santa Fe, CA (US);
Kevin Gard, Raleigh, NC (US);
Anthony Segoria, San Diego, CA (US);
Gurkanwal (Kamal) Sahota, San Diego, CA (US);
Charles Persico, Rancho Santa Fe, CA (US);
Qualcomm Incorporated, San Diego, CA (US);
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.