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Auxiliary DC Alignment for Carrier Feed Through Suppression Disclosure Number: IPCOM000011630D
Original Publication Date: 2003-Mar-10
Included in the Prior Art Database: 2003-Mar-10

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Scott R. Anderson


In many of the transmitter architectures, the minimization of carrier feed through (CFT) has been an issue. CFT is usually a manifestation of DC offsets occurring within the transmitter. These DC offsets are traditionally trained out through the use of a training algorithm within the transmit IC, but this training cannot always account for all of the additive components that contribute to CFT. The most common of these is DC offsets in the baseband input to the IC, but it can also include LO leakage into the feedback path (in Cartesian Loop