Description  Claims  Drawing  Cited references 

US20110273239A   [0007] 
US9425737B1   [0008] 

A Noise-Shifting Differential Colpitts VCO   [0003] 
2013 IEEE Radio Frequency Integrated Circuits Symposium, 978-1-4673-6062-3/13   [0004] 
Tuning Range Extension of a Transformer-Based Oscillator through Common-Mode Colpitts Resonance   [0005]