| 摘要 |
A quadrature transmitter ( 200 ) and receiver ( 100 ) have configurable I and Q channel paths that facilitate the application of select test signals to determine gain and phase imbalance introduced by each of the transmitter ( 200 ) and receiver ( 100 ). In a first 'normal' configuration, each of the I and Q channels are independently tested by applying an I-only test signal, followed by a Q-only test signal. In a second 'switched transmitter' configuration, the Q-only test signal is again applied. In a third 'switched receiver' configuration, the I-only test signal is again applied. By combining the results of the application of each of these test signals, gain and phase imbalance of each of the transmitter and the receiver can be determined. In a preferred embodiment, these configurations and test signals are applied within a single transceiver ( 300 ) that has the output of its transmitter ( 200 ) closed-loop coupled to the input of its receiver ( 100 ).
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