2차 고조파를 이용한 UWB 시스템용 쿼드러쳐 혼합기 설계

초록

This paper presents an ultra wideband(UWB) direct conversion mixer for IEEE 802.15.3a applications with simulation and measurement results. Since the direct conversion mixing causes dc-offset and even-order distortion, the proposed mixer adopts an anti-parallel diode pairs(APDPs) to solve these problems. The proposed mixer consists of an in-phase wilkinson power divider over 3.1～4.8 GHz, a wideband 45° power divider over 1.5～2.4 GHz, and miniatured band pass filters(BPFs) for RF-LO isolations. The conversion loss is optimized with impedance matchings between APDPs and wideband components. The measured mixer shows the conversion loss of 13.5 dB, input third-order intercept-point(IIP3) of 7 dBm, and 1-dB gain compression point(P1dB) of 4 dBm. Quadrature(I/Q) outputs have the magnitude difference of about 1 dB and phase difference of ±3°.

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