Balanced Monolithic Frequency Doublers for Millimeter Wave Signal Source with Low211 Phase Noise

摘要

In digital wireless systems, the achievable bit error rate is strongly dependent211u001eon low phase noise in millimeter wave signal sources. The low phase noise can be 211u001eachieved with frequency multiplication of high performance microwave oscillators. 211u001eIn this study, the authors reduced the size of the millimeter wave balanced 211u001efrequency doublers by minimizing the size of the balun. Consequently, the authors 211u001eevaluated artificial transmission line (ATL) and spiral transmission line 211u001etransformer in the balun design and developed a balanced millimeter wave 211u001efrequency doubler, which used only 0.3 sq mm area on MMIC. In addition, the 211u001ebalanced doubler had highly wide frequency bandwidth of an octave and rejected 211u001ethe fundamental frequency signal by more than 25dB over this bandwidth. The 211u001eauthors also present theoretical evaluation and simulation of these novel 211u001ebalanced frequency doublers. The design and measurements of the balanced 211u001efrequency doublers based on these data are included. Finally, the authors 211u001edemonstrate the frequency doublers in a millimeter wave signal source with ultra 211u001elow phase noise.