Title :
Varactor characteristics, oscillator tuning curves, and AM-FM conversion
Author :
Hegazi, Emad ; Abidi, Asad A.
Author_Institution :
Dept. of Electr. Eng., Univ. of California, Los Angeles, CA, USA
fDate :
6/1/2003 12:00:00 AM
Abstract :
A simple analysis relates the small-signal specification of a varactor´s capacitance to an oscillator´s tuning curve. The notion of an effective capacitance across the amplitude of oscillation is introduced. The analysis also explains how the varactor converts AM noise on the oscillation into FM, which is phase noise. The analysis is experimentally validated.
Keywords :
circuit tuning; phase noise; radiofrequency integrated circuits; radiofrequency oscillators; varactors; voltage-controlled oscillators; AM noise; AM-FM conversion; FM noise; amplitude of oscillation; differential LC oscillator; oscillator tuning curves; phase noise; small-signal specification; tuning curve; varactor characteristics; voltage-controlled oscillator; Capacitance; Circuits; Frequency; Phase noise; Steady-state; Tail; Tuning; Varactors; Voltage control; Voltage-controlled oscillators;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2003.811968
