Patent ID: 8135055
Filing Date: 2012-03-13
Classification: H04L

Abstract:
1. A method comprising: (a) receiving a single tone reference signal into a quadrature mixer of a transmit path, wherein the transmit path exhibits a gain mismatch and a phase mismatch; (b) using the single tone reference signal to generate an up-converted RF signal; (c) transmitting the up-converted RF signal via an RF loop-back path to a quadrature mixer of a receive path, wherein the receive path exhibits a gain mismatch and a phase mismatch; (d) using the up-converted RF signal to generate a down-converted evaluation signal, wherein the down-converted evaluation signal is generated as a result of the single tone reference signal being received in (a); and (e) using the down-converted evaluation signal to determine the gain mismatch of the transmit path, the phase mismatch of the transmit path, the gain mismatch of the receive path, and the phase mismatch of the receive path substantially simultaneously at one time, wherein the evaluation signal has a first sideband tone with a first amplitude, a second sideband tone with a second amplitude, a third sideband tone with a third amplitude and a fourth sideband tone with a fourth amplitude, and wherein the gain mismatch and the phase mismatch of the transmit path and the gain mismatch and the phase mismatch of the receive path are determined based on the first amplitude, the second amplitude, the third amplitude and the fourth amplitude.