Title :
AM-to-PM conversion in varactor-tuned oscillators
Author :
Levantino, Salvatore ; Samori, Carlo ; Zanchi, Alfio ; Lacaita, Andrea L.
Author_Institution :
Dipt. di Elettronica e Inf., Politecnico di Milano, Italy
fDate :
7/1/2002 12:00:00 AM
Abstract :
This brief deals with AM-to-PM noise conversion due to varactors and nonlinear capacitances. The effect increases the sensitivity of oscillators to substrate and power supply noise and sets a serious limitation to the phase noise performance of these stages when they are embedded in complete transceivers. A rigorous approach to the quantitative estimate of the conversion factor and a closed-form expression are derived. The conversion due to typical varactor structures available in integrated technology is discussed.
Keywords :
BiCMOS analogue integrated circuits; UHF integrated circuits; UHF oscillators; amplitude modulation; integrated circuit noise; phase modulation; phase noise; varactors; voltage-controlled oscillators; 0.35 micron; 2.4 GHz; AM-to-PM noise conversion; BiCMOS technology; SPICE-like simulator; analog integrated circuits; closed-form expression; conversion factor; nonlinear capacitances; oscillator sensitivity; phase noise performance; power supply noise sensitivity; substrate noise sensitivity; transceivers; varactor structures; varactor-tuned oscillators; varactors; voltage-controlled oscillators; Amplitude modulation; Capacitors; Circuit noise; Low-frequency noise; Phase noise; Power supplies; Transceivers; Tuning; Varactors; Voltage-controlled oscillators;
Journal_Title :
Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on
DOI :
10.1109/TCSII.2002.804051
