Title :
A wide-tuning range 1.8 GHz quadrature VCO utilizing coupled ring oscillators
Author :
Mesgarzadeh, Behzad ; Alvandpour, Atila
Author_Institution :
Dept. of Electr. Eng., Linkoping Univ.
Abstract :
This paper presents a fully integrated 1.8 GHz, 0.35-mum CMOS quadrature voltage-controlled oscillator (QVCO) design. The topology uses coupled ring oscillators to produce quadrature outputs. In order to gain better phase noise performance LC-based filtering is introduced to QVCO. Also using variable inductance concept, a 1.2 GHz tuning range is achieved. According to simulation results, proposed QVCO draws 26.1 mA from 3.3V supply and exhibits a worst-case phase noise of -117.3 dBc/Hz at 1-MHz offset over the tuning range
Keywords :
CMOS integrated circuits; UHF integrated circuits; UHF oscillators; coupled circuits; phase noise; voltage-controlled oscillators; 0.35 micron; 1 MHz; 1.2 GHz; 1.8 GHz; 26.1 mA; 3.3 V; CMOS quadrature voltage-controlled oscillator design; LC-based filtering; phase noise; ring oscillators; variable inductance; Circuit topology; Coupling circuits; Filtering; Frequency conversion; Inverters; Performance gain; Phase noise; Ring oscillators; Tuning; Voltage-controlled oscillators;
Conference_Titel :
Circuits and Systems, 2006. ISCAS 2006. Proceedings. 2006 IEEE International Symposium on
Conference_Location :
Island of Kos
Print_ISBN :
0-7803-9389-9
DOI :
10.1109/ISCAS.2006.1693790
