Implementation of Novel Quadrature Voltage-Controlled-Oscillator and Dual-Resonance Injection-Locked Frequency Dividers

• Main Authors: Chih-chieh Shih, 施智傑
• Other Authors: Sheng-Lyang Jang
• Format: Others
• Language: en_US
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/14107674166589555690

碩士 === 國立臺灣科技大學 === 電子工程系 === 98 === 　The voltage controlled oscillator (VCO) and the injection locked frequency divider (ILFD) are two kinds of important sub-circuits in wireless telecommunication systems. Designing requirements of these circuits become more stringent on the aspects of low-power and low-complexity for modern portable and multi-standard uses. This thesis describe three novel dual resonance multi-band injection locked frequency dividers and a new quadrature voltage controlled oscillator. 　The First part proposed two dual resonance dual-band ILFD with 4th order resonator. One of the circuits is a divide-by-2 ILFD. At supply voltage of 1.25 V, the free-running frequency can be from 3.22 (6.76) GHz to 3.41 (7.53) GHz for the low-(high-) frequency band. The divide-by-2 operational locking range can be from 6.3 (12.8) GHz to 6.95 (15.3) GHz for the low- (high-) frequency band. The other one is a divide-by-2 and -4 ILFD. Measurement results show that at supply voltage of 0.8 V, the low-band free-running frequency is tunable from 2.7 to 3.18 GHz. one excited high-band frequency band is from 4.07 to 4.13 GHz. The divide-by-2 operational locking range is from 3.4 to 9.4 GHz and divide-by-4 operational locking range is from 10.5 (15.95) GHz to 13.6 (16.9) GHz for the low- (high-) frequency band. 　Then the dual resonance triple-band divide-by-2 injection locked frequency divider is presented. The ILFD is realized with a cross-coupled nMOS oscillator with a double-tuned transformer resonator. At the dc drain-source voltage of 0.65 V, the free-running ILFD can have two frequency band s while switching one varactor bias, and tuning range is from 4.23 (8.89) to GHz to 4.47 (10.39) GHz for the low- (high-) frequency band. The operational locking range is from 7.6 (15.3) GHz to 10 (19.9) GHz for the low- (high-) frequency band. The double-resonace ILFD has one excited locking frequency band while biasing at the high-frequency band, the excited operational locking range is from 5.75 to 6.3 GHz. 　Finally, a novel quadrature VCO (QVCO) is showed, which consists of two complementary cross-coupled VCOs with two tail inductors. The two differential VCOs are coupled via two tail inductor. At the supply voltage of 1.45 V, the output phase noise of the QVCO is -124.58 dBc/Hz at 1MHz offset frequency from the carrier frequency of 5.15 GHz, and the figure of merit (FOM) is -189.42 dBc/Hz. The power consumption of QVCO core is 8.7 mW. The free-running frequency of the QVCO is tunable from 4.94 GHz to 5.22 GHz as the control voltage is varied from 0 V to 1.0 V.