Modeling a resonant LC tank circuit embedded in a VCO

Abstract

This paper reveals the frequency-dependent behavior of the effective positive conductance in a passive LC tank circuit embedded in a voltage-controlled oscillator, (VCO). This frequency-dependent behavior of the effective positive conductance makes the signal level of the. VCO also frequency dependent. Moreover, this effective positive conductance is dominated by the series resistance of the inductor and sets the criteria for minimizing the tank current to provide a desired output signal level.