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A planar miniature CMOS dual balun with unequal coupled-line width for millimeter-wave (MMW) transceiver is reported. The dual balun can be applied to a star mixer or a four-way power amplifier for four-way equal power dividing. The dual balun occupies a small chip area of 0.0252 mm2 and achieves S11 smaller than −12 dB for frequencies of 50∼110 GHz. For frequencies of 55∼65 GHz, the dual balun achieves...
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