Title :
A 2.4-GHz linear-tuning CMOS LC voltage-controlled oscillator
Author :
Zhang, Hong ; Chen, Guican ; Li, Ning
Author_Institution :
Inst. of Microelectron., Inst. of Microelectron., Xi´´an, China
Abstract :
This paper presents a voltage-controlled oscillator (VCO) with high linearity in frequency tuning. The VCO has two control inputs. One controls a pair of p+/n-well varactors to realize continuous tuning and the other controls a pair of MOS varactors for band switching. This new circuit topology achieves a good tuning nonlinearity of 1.45% and a wide total tuning range from 2.33 GHz to 2.72 GHz. The simulated phase noise is only -115.7 dBc/Hz at 600kHz offset from 2.4 GHz. Based on a 0.25-μm process, the VCO dissipates only 15mW at a 2.5-V supply voltage.
Keywords :
CMOS integrated circuits; circuit tuning; varactors; voltage-controlled oscillators; 0.25 micron; 1.45 percent; 2.33 to 2.72 GHz; 2.4 GHz; 2.4 V; 600 kHz; CMOS LC voltage-controlled oscillator; MOS varactors; band switching; circuit topology; frequency tuning; linear-tuning; p+/n-well varactors; Circuit optimization; Circuit simulation; Circuit topology; Frequency; Linearity; Phase noise; Tuning; Varactors; Voltage; Voltage-controlled oscillators;
Conference_Titel :
Design Automation Conference, 2005. Proceedings of the ASP-DAC 2005. Asia and South Pacific
Print_ISBN :
0-7803-8736-8
DOI :
10.1109/ASPDAC.2005.1466465
