Abstract: A dual-band transceiver is disclosed. In one embodiment, the system includes a first mixer circuit that generates a first signal having a first frequency that is within a first predefined frequency range. The system also includes a second mixer circuit that generates a second signal having one of a second frequency that is within a second predefined frequency range and a third frequency that is within a third predefined frequency range, and wherein each of the first mixer circuit and the second mixer circuit are used for at least two frequency bands.

Abstract: A method and system for calibrating the mismatch between I data and Q data of a receiver is disclosed. The receiver includes an amplifier, first and second mixers coupled to the amplifier, an oscillator for driving the first and second mixers; and first and second filters coupled to the first and second mixers. The method comprises turning off the amplifier; and injecting a signal into the first and second mixers. The method also requires measuring the amplitude and phase information of the I and Q data from the first and second mixers based upon the injected signal to provide mismatch information and utilizing the mismatch information to compensate the I data and the Q data during normal operating mode. In a method and system in accordance with an embodiment, the IQ mismatch of a receiver can be measured and compensated. This allows direct-conversion architecture, which is known to have IQ mismatch problem, to be used.

Abstract: A dual-band transceiver is disclosed. In one embodiment, the system includes a first mixer circuit that generates a first signal having a first frequency that is within a first predefined frequency range. The system also includes a second mixer circuit that generates a second signal having one of a second frequency that is within a second predefined frequency range and a third frequency that is within a third predefined frequency range, and wherein each of the first mixer circuit and the second mixer circuit are used for at least two frequency bands.

Abstract: A method is disclosed to correct the IQ mismatch of an RF transceiver. The method generates a reference signal down a transmitting-receiving loop and measures the received signals SDTA-1 and SDTA-2, respectively dominated by their desired component and image component, under two programmed mixer settings of operating mode and LOF. The method then calculates a system image rejection ratio (IRRsys) with SDTA-1 and SDTA-2, systematically adjusts the amplitude and phase pre-distortion of the transmitting baseband signals till IRRsys is maximized thus correcting for the transmitter IQ mismatch. The now-corrected transmitter IQ mismatch is then used to correct receiver IQ mismatch by reprogramming the first setting and measuring mismatches in amplitude ?A and phase ?? between received baseband IQ signals, corrects for ?A and ?? accordingly and stores the corrective values for future compensation of receiver IQ mismatch.