paper 150204210610

Published: 2015-07-09

An Ultra Low-power and Low-noise VCO Using Transformer Coupled Dual LC Tanks Topology

Hwann-Kaeo Chiou,

Hwann-Kaeo Chiou

National Central University, Taiwan

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Kuan-Hsiu Chien,

Kuan-Hsiu Chien

National Central University, Taiwan

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Tzu-Yun Chou

National Central University, Taiwan

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Proceedings of 2015 Photonics & Electromagnetics Research Symposium, Prague, July 6 - 9，Page(s)1411-1414

Abstract

A K-band low power voltage-controlled oscillator (VCO) using transformer coupled dual LC tanks is implemented in a 90-nm CMOS process. The use of transformer provides tight coupling factor between two LC tanks that improves the phase noise performance by increasing the output signal swing and waveform symmetry of the VCO. In addition, taking advantage of the tight-coupling transformer, the inductor layout is properly designed to obtain a high Q-factor and a die area comparable to single-inductor VCO. The VCO core dissipates very small DC power of 1.61 mW from a 0.7-V supply due to the benefit of tight-coupled transformer. The measured phase noise is −97.61 dBc/Hz at 1-MHz offset from 23.99 GHz oscillation frequency.

Citation

Hwann-Kaeo Chiou, Kuan-Hsiu Chien, and Tzu-Yun Chou, "An Ultra Low-power and Low-noise VCO Using Transformer Coupled Dual LC Tanks Topology," Proceedings of 2015 Photonics & Electromagnetics Research Symposium, Prague, July 6 - 9，Page(s)1411-1414

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