Jamil Asad, Kalkur Thottam S, Cramer Nicholas
University of Colorado, Colorado Springs 80918, USA.
IEEE Trans Ultrason Ferroelectr Freq Control. 2007 Feb;54(2):222-6. doi: 10.1109/tuffc.2007.314503.
Ferroelectric capacitors made from Ba(1-0.5)Sr0.5TiO3 (BST) are applied as varactors in tunable, high-frequency circuit applications. In this context, a voltage-controlled oscillator (VCO) has been designed and implemented using discrete RF bipolar junction transistor (BJTs) and tunable ferroelectric capacitor. The designed VCO has a tuning range from 205 MHz to 216.3 MHz with a power dissipation of 5.1 mW. The measured phase noise is -90 dBc/Hz at 100 kHz and -140 dBc/Hz at 1 MHz offset.
由Ba(1-0.5)Sr0.5TiO3（BST）制成的铁电电容器被用作可调谐高频电路应用中的变容二极管。在此背景下，已使用分立射频双极结型晶体管（BJT）和可调谐铁电电容器设计并实现了一个压控振荡器（VCO）。所设计的VCO的调谐范围为205 MHz至216.3 MHz，功耗为5.1 mW。在100 kHz偏移时测得的相位噪声为-90 dBc/Hz，在1 MHz偏移时为-140 dBc/Hz。
