Patent ID: 7715836

Claim:
A transceiver for transmitting and receiving signals, the transceiver comprising: a transmitter operative to up-convert baseband signals from a baseband frequency into RF signals at a radio frequency (RF) frequency and output the RF signals; a receiver operative to receive RF signals and down-convert the received RF signals into baseband signals having the baseband frequency; a plurality of calibration paths coupling the transmitter to the receiver, wherein one or more of the calibration paths can be selected to be active when calibrating components of the transceiver using one or more of a plurality of calibration methods, wherein the transceiver is a direct up-conversion and down-conversion architecture, and comprises baseband analog transmit filters having responses which can be measured for calibration using one of the calibration paths, and wherein one of the calibration paths comprises a loopback connection that couples the transmitter to the receiver; and digital-to-analog converters (DACs) coupled to the transmit filters, and controllable to tune the transmit filters based on the measurements of the transmit filters over the calibration path.