| 摘要 |
A mixer circuit with improving characteristic of image rejection by compensating mismatch in a spurious rejection mixer circuit (SRM) used in a transmitter is provided. The mixer circuit according to the present invention comprises an up conversion unit for modulating a base-band input signal to a RF signal, a down conversion unit for converting an output signal from the up conversion unit to a base-band output signal, mismatch estimating means for determining a mismatch compensation value by which spurious component in an output signal from the down conversion unit is minimized, wherein the spurious component results from mismatch in the up conversion unit, and mismatch compensating means for compensating the mismatch in the up conversion unit by using the mismatch compensation value determined by the mismatch estimating means.
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