A Study of A 3D Helical Inductors Low Voltage VCO and A 5/2.5G Injection Locked Quadrature VCO

• Main Authors: Chi li-Jen, 錡利仁
• Other Authors: Sheng-lyang Jang
• Format: Others
• Language: en_US
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/27pu9b

碩士 === 國立臺灣科技大學 === 電子工程系 === 94 === This thesis is mainly composed of two topics, the first one is the 2.4-GHz low-voltage voltage controlled oscillator (VCO) with 3D helical inductors. The LC resonator consists of two tapped 3D helical inductors and varactors. The balanced VCO has two differential outputs and the frequency is tuned by varactors. It effectively makes use of 3D helical inductors to reduce the area of the whole chip, and to decrease the phase noise by center tapped inductors. The second one is the 5/2.5GHz injection locked quadrature VCO circuit, using a 5GHz Colpitts VCO to inject signals into two complementary type CMOS VCOs to produce the quadrature outputs. It makes use of PMOS to reduce flicker noise in order to get better phase noise.