A 5 GHz Differential Colpitts CMOS VCO Using the Bottom PMOS Cross-Coupled Current Source

  title={A 5 GHz Differential Colpitts CMOS VCO Using the Bottom PMOS Cross-Coupled Current Source},
  author={Jian-An Hou and Yeong-Her Wang},
  journal={IEEE Microwave and Wireless Components Letters},
A low phase noise differential Colpitts voltage-controlled oscillator (VCO) with the bottom series PMOS cross-coupled current source is presented. The core Colpitts VCO adopts a pair of PMOS as the biased current source at the bottom, instead of a conventional NMOS topology, to achieve a better phase noise performance as the PMOS has lower flicker and white noise than those of NMOS and the output power spectral density of PMOS operated in bottom-biased type is further less than that in top… CONTINUE READING
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