Patent ID: 7567788

Claim:
A method ( 200 ) of gain calibration for a transceiver having a transmitter unit and a receiver unit including a measurement unit and including two feed back coupling paths from the transmitter unit to the receiver unit, the method comprising the steps of: setting ( 201 ) a reference signal level of a feedback signal from the transmitter unit by adjusting characteristics of the transmitter unit in response to a measured signal level; measuring ( 203 ) by the measurement unit, a measurement reference value associated with the reference signal level when sent via a first feed back coupling path; measuring, by the measurement unit, at least one measurement of a signal level transmit on a second feed back coupling path from the transmitter unit via a receiver path; changing ( 205 ) a gain parameter of a transceiver unit of the transceiver by a gain step; measuring ( 207 ), by the measurement unit a gain adjusted feedback signal level of the second feedback coupling path; determining ( 209 ) an effect of the gain step on the feedback signal level relative to said measurement reference value; and calibrating ( 211 ) the gain step according to said relative effect of the gain step on the feedback signal.