Title :
Tracking Phaselock Loop Characteristics with a VCO Using a Barium Strontium Titanate (BST) Thin-Film Varactor
Author :
Victor, A. ; Nath, J. ; Gard, K.G. ; Maria, J-P. ; Kingon, A.I. ; Steer, M.B.
Author_Institution :
Div. of Microwave Commun., Harris Corp., Morrisville, NC
Abstract :
Barium strontium titanate (BST) varactors utilized in a VCO demonstrate unique tuning characteristics compared to junction varactors. A 2.7 GHz microstrip line VCO operates in a tracking phaselock loop configured as an X4 frequency multiplier. BST oscillator tuning and the effect on loop dynamics is observed by the intentional design of an under damped system. Oscillator noise correction and peaking is noted particularly at low tune voltages. Loop dynamics are addressed through proper design of the loop compensator filter. The differences between BST varactor and junction varactor operation in frequency control are noted
Keywords :
barium compounds; frequency multipliers; phase locked loops; thin film devices; varactors; voltage-controlled oscillators; barium strontium titanate thin-film varactor; frequency multiplier; junction varactor; loop compensator filter; loop dynamics; microstrip line VCO; oscillator noise correction; phaselock loop characteristics; under damped system; Barium; Binary search trees; Microstrip; Strontium; Titanium compounds; Tracking loops; Transistors; Tuning; Varactors; Voltage-controlled oscillators; BST; PLL; VCO; ferroelectric; loop filter; resonator; tracking loop;
Conference_Titel :
Radio and Wireless Symposium, 2007 IEEE
Conference_Location :
Long Beach, CA
Print_ISBN :
1-4244-0445-2
Electronic_ISBN :
1-4244-0445-2
DOI :
10.1109/RWS.2007.351825
