Title :
A CMOS VCO with 48% tuning range for modern broadband systems
Author :
Manetakis, K. ; Jessie, Darryl ; Narathong, Chiewcharn
Author_Institution :
Qualcomm CDMA Technol., San Diego, CA, USA
Abstract :
This paper presents a CMOS VCO in a 0.35 μm process which achieves a tuning range of 2.8 GHz-4.55 GHz and phase noise of -142dBc/Hz at 3 MHz offset (from a 1.8 GHz carrier). 5-bit digital coarse-tuning and accumulation-type MOS varactors allow for a 48% tuning range. An integrated regulator provides low supply pushing (100 kHz/V), reduces AM-to-PM sensitivity from the supply, and ensures optimum operation on multi-band/multi-standard single-chip transceivers with simultaneous operation. A model for the hand analysis of VCO noise is presented giving excellent agreement with measurements.
Keywords :
CMOS integrated circuits; MMIC oscillators; circuit tuning; phase noise; transceivers; varactors; voltage regulators; voltage-controlled oscillators; 0.35 micron; 1.8 GHz; 2.8 to 4.55 GHz; CMOS VCO; accumulation-type MOS varactors; digital coarse-tuning; integrated regulator; low supply pushing; multiband transceivers; multistandard single-chip transceivers; phase noise; supply AM-to-PM sensitivity; tuning range; Inductors; Multiaccess communication; Phase noise; Power dissipation; Regulators; Switches; Transceivers; Tuning; Varactors; Voltage-controlled oscillators;
Conference_Titel :
Custom Integrated Circuits Conference, 2004. Proceedings of the IEEE 2004
Print_ISBN :
0-7803-8495-4
DOI :
10.1109/CICC.2004.1358794
