Chip design of a 5.6-GHz 1-V wide tuning range frequency synthesizer with Gm-boosting Colpitts VCO for biomedical application

A low‐phase‐noise and low‐power CMOS colpitts VCO using Gm boosting and capacitance switching techniques

“…In other words, the phase noise of VCOs can apparently degrade selectivity and sensitivity. The paper recently focused on low‐noise and low power LC‐VCO, 1 but other papers did not show great performances in their VCO designs 2‐4 . A G m ‐boosting Colpitts VCO, which was used to increase output power and to reduce phase noise simultaneously, was found in Reference 2.…”

“…The paper recently focused on low‐noise and low power LC‐VCO, 1 but other papers did not show great performances in their VCO designs 2‐4 . A G m ‐boosting Colpitts VCO, which was used to increase output power and to reduce phase noise simultaneously, was found in Reference 2. The Q ‐factors of the transformer‐based tank were improved in References 3,4, but the improvement of the measured phase noise and power consumption were not significant.…”