LO METHOD AND APPARATUS TO DETECT LO LEAKAGE AND IMAGE REJECTION USING A SINGLE TRANSISTOR

摘要

Local oscillator (LO) leakage and image are common and undesirable effects in common transmitters. In general, fairly complex hardware and algorithms are used to correct and reduce such failures. A single transistor, which inherently occupies a very small area without consuming dc current, detects LO leakage and image signals. A single transistor operating as a square-law device is used to mix the signals at the input and output ports of the power amplifier. A mixing signal generated by a single transistor enables simultaneous correction of LO leakage and image rejection.