Patent ID: 8295845
Filing Date: 2012-10-23
Classification: H04B

Abstract:
1. A method for performing I/Q mismatch calibration in a wireless communication device comprising a receiver unit and a transmitter unit, the method comprising: during an I/Q mismatch calibration mode, providing a first signal from the transmitter unit to the receiver unit of the wireless communication device via a loopback path coupled between the transmitter unit and receiver unit, wherein said providing the first signal comprises closing a bypass switch of a phase shift unit in the loopback path to bypass the phase shift unit in the loopback path when the first signal is provided to the receiver unit during the I/Q mismatch calibration mode; during the I/Q mismatch calibration mode, providing a second signal from the transmitter unit to the receiver unit of the wireless communication device via the loopback path coupled between the transmitter unit and receiver unit, wherein said providing the second signal to the receiver unit comprises opening the bypass switch of the phase shift unit in the loopback path to add the phase shift to the second signal via the phase shift unit when the second signal is provided to the receiver unit during the I/Q mismatch calibration mode; determining a first set of I/Q measurements from the first signal and a second set of I/Q measurements from the second signal with the added phase shift; calculating transmitter I/Q mismatch parameters and receiver I/Q mismatch parameters based on the first and second sets of I/Q measurements; and programming the transmitter unit to compensate for I/Q mismatch at the transmitter unit based on the transmitter I/Q mismatch parameters and programming the receiver unit to compensate for I/Q mismatch at the receiver unit based on the receiver I/Q mismatch parameters.