Design Of Wideband VCO In Frequency Synthesizer For Multi-mode Multi-standard Transceiver

The field of wireless communication has grown rapidly over the past several decades,reaching far into our lives and livelihood.Along with higher integration level,better performance and lower power consumption,the development of RF circuit promotes the progress of wireless communication.In order to adapt to the current trend of wireless communication development,a receiver that supports multi-standard and multi-band has become a focus.As the key module in the transceiver,the frequency synthesizer provides the vibration signal for transceiver.The performance of Voltage-Controlled Oscillator(VCO)determines the frequency range and phase noise performance of the synthesizer,which makes designing VCO a key part of designing the frequency synthesizer.This thesis introduces the theoretical basis of VCO,and uses different models to analyze the phase noise of VCO.After comparing with different wideband VCO structure,this paper designs a triple-mode wideband VCO using TSMC 0.18-pm CMOS technology.The triple-mode VCO uses a sixth-order resonator based on three coupled inductors with a compact common-centric layout.The coupled inductors are designed and simulated using ADS Momentum.Current-reuse topology is used to reduce power dissipation.To further expand the frequency range,varactors and a 5-bit switched capacitor array are used.The circuit and layout design in this thesis are completed by using Cadence tools.Post-simulation results show that the proposed VCO covers a frequency range of 1.36-5.92GHz and phase noise at 1MHz offset is less than-110.2dBc/Hz.Power consumption of the core VCO is less than 12mA.The whole chip area is 1688μm×1191μm.According to the simulation results,all the performances meet the design requirements.