| 摘要 |
A mixer core is provided which has a pair of CMOS transistors 21 and 22 connected as a matched pair and having a common source node N<SUB>1</SUB>. The CMOS transistors have a non-linear parasitic capacitance which degrades the harmonic performance of the mixer core. An inductor is connected to the common source node and optionally to ground, a signal input node or to a further common source node when the mixer core is part of a double balanced mixer. The inductor is chosen such that it co-operates with the parasitic capacitors to form a resonant circuit tuned to the local oscillator frequency or optionally a harmonic of it, such as the second harmonic, or to the input signal frequency.
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