FLICKER NOISE, POWER CONSUMPTION, AND PULLING REDUCTION TECHNIQUES FOR VOLTAGE-CONTROLLED OSCILLATORS (VCOs)

摘要

Certain aspects of the present disclosure provide methods and apparatus for reducing flicker noise, power consumption, and/or frequency pulling in voltage-controlled oscillators (VCOs). One example VCO generally includes an active negative transconductance circuit and a resonant circuit connected between a voltage rail for the VCO and the active negative transconductance circuit, wherein the resonant circuit is configured to resonate at a frequency of an oscillating signal generated by the VCO. The resonant circuit may provide high impedance between the voltage rail and the VCO at the frequency of the oscillating signal

主权项

1. A voltage-controlled oscillator (VCO), comprising:
an active negative transconductance circuit; a first resonant circuit connected between a voltage rail for the VCO and the active negative transconductance circuit, wherein the first resonant circuit is configured to resonate at a frequency of an oscillating signal generated by the VCO:, a second resonant circuit configured to control the frequency of the oscillating signal generated by the VCO; and a capacitive element coupled between the second resonant circuit and a common-mode voltage for the VCO.