Rf Integration (rf Ics) Research And Design Of The Voltage-controlled Oscillator (vco)

The explosive growth of wireless communications system has driven research and development on RF IC. With the rapid advancement of process and technology, especially the realization of on-chip passive elements such as inductors and varactors, the on-chip implementation of voltage-controlled oscillators (VCOs) which are necessary in wireless transceivers has become easy. On-chip VCO is a key factor in lowering the cost of wireless transceivers and has sturdy requirements in system application. It's an important subject in the area of RF IC to fulfill the noise and tuning range requirements with low power consumption.The theory and practice of full-integrated LC VCO are studied in this thesis. With a view to domestic and overseas references that are related, a VCO is designed under the conditions of low voltage-supply, low power consumption, low phase noise and large tuning range. Major contents and results of study are abstracted as following.1. VCO's theory and parameters especially for the basic mechanism of phase noise are studied. The parasitic effects of RF-IC passive devices such as inductors and varactors and the design guidelines for the on-chip spiral inductors are included too. The accumulation -mode varactor, which has a higher quality factor value than the inversion-mode MOS varactor, is studied in detail.2. The VCO's topology is presented according to the conditions of low voltage-supply, low power consumption, low phase noise and large tuning range. With consideration of parameters trade-offs involved in the circuits, the VCO's topology is designed. With Linear Time-Invariant modeling of phase noise and definition of"effective resistor", we analyze the critical parameters of the circuit and calculate the value of phase noise at the 1 /f~2 region.3. A 4.2GHz VCO tuned by an accumulation-mode MOS varactor in TSMC 0.35μm SiGe BiCMOS process is obtained after debugging with the simulator SpectreRF. The VCO is optimized according to the targets of low voltage-supply, low power consumption, low phase noise and large tuning range. With a voltage-supply of...