An Improved Colpitts VCO With Low Phase Noise Using a GaAs BiHEMT Process

Xinlin Xia,Xu Cheng,Fengjun Chen,Xianhu Luo,Xianjin Deng

IEEE Microwave and Wireless Components Letters（2020）

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摘要

In this letter, an improved balanced Colpitts voltage-controlled oscillator (VCO) with a collector-emitter cross-coupled capacitors is presented. The proposed Colpitts structure can introduce a more robust oscillation startup condition. The noise-shifting technique is used to enhance the loaded quality factor of the tank, which improves the phase noise in turn. In addition, three-bit switches comp...

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关键词

Voltage-controlled oscillators,Phase noise,Tuning,Gallium arsenide,Heterojunction bipolar transistors,Silicon

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