Patent ID: 8681840
Filing Date: 2014-03-25
Classification: H04B

Abstract:
1. A transceiver comprising: a transmitter circuit configured to, in a normal mode, up-convert a transmission digital signal to generate a first transmission signal, the transmitter circuit being further configured to, in a calibration mode, perform a digital-to-analog conversion (DAC) operation on a calibration code without the transmission digital signal to generate a calibration signal, change a bias of a mixer in response to the calibration signal, and output a carrier signal of an oscillator as a second transmission signal; a receiver circuit configured to, in a normal mode, down-convert a receiving signal received from an antenna to generate a first receiving digital signal, the receiver circuit being further configured to, in the calibration mode, down-convert the second transmission signal to generate a second receiving digital signal; and a loopback switch configured to electrically connect an output terminal of the transmitter circuit with an input terminal of the receiver circuit in the calibration mode.