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The development of 5G communication systems is underway. When employing 64 QAM, very low phase noise levels are required to limit EVM — i.e. less than −117dBc/Hz at 1MHz offset from f=20GHz. In this paper, the challenges of achieving such a low phase noise are discussed in detail. The choice between CMOS vs BJT devices is investigated and the impact of the base resistance intrinsic in BJT-based VCOs...
Next-generation 5G communication systems require adaptive high-order modulations to increase spectral efficiency. To limit EVM, very low phase noise levels are required — i.e. less than −117dBc/Hz at 1MHz offset for 64QAM at f=20GHz. In this paper, the design and measurements of a low-noise K-Band VCO are presented. The challenges of achieving such a low phase noise are discussed in detail, with particular...
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