Title :
Coupled Inverter Ring I/Q Oscillator for Low Power Frequency Synthesis
Author :
Xu, Junfeng ; Verma, Shwetabh ; Lee, Thomas H.
Author_Institution :
Center for Integrated Syst., Stanford Univ., CA
Abstract :
A novel 12-stage VCO with in-phase and quadrature outputs at the 3rd harmonic of the oscillating frequency is presented. It employs coupled inverter rings. A new linear model of coupled inverter rings is developed to identify all possible oscillating modes and their frequencies using the Barkhausen criterion. A frequency synthesizer implemented in 0.18mum CMOS with such a VCO has wide tuning range, and consumes only 2.8mA from a 1.5V supply to generate 2.4GHz differential I/Q outputs
Keywords :
CMOS analogue integrated circuits; UHF oscillators; coupled circuits; frequency synthesizers; integrated circuit modelling; linear network analysis; low-power electronics; voltage-controlled oscillators; 0.18 micron; 1.5 V; 2.4 GHz; 2.8 mA; Barkhausen criterion; CMOS; VCO; coupled inverter rings; frequency synthesizer; linear model; low power frequency synthesis; Coupling circuits; Frequency synthesizers; Inverters; MOS devices; Power harmonic filters; Ring oscillators; Semiconductor device modeling; Signal generators; Voltage; Voltage-controlled oscillators;
Conference_Titel :
VLSI Circuits, 2006. Digest of Technical Papers. 2006 Symposium on
Conference_Location :
Honolulu, HI
Print_ISBN :
1-4244-0006-6
DOI :
10.1109/VLSIC.2006.1705365
