Journal article
Analysis and Design of a 1.8-GHz CMOS LC Quadrature VCO
This paper presents a quadrature voltage-controlled oscillator (QVCO) based on the coupling of two LC-tank VCOs. A simplified theoretical analysis for the oscillation frequency and phase noise displayed by the QVCO in the 1/f3 region is developed, and good agreement is found between theory and simulation results.
A prototype for the QVCO was implemented in a 0.35-μm CMOS process with three standard metal layers. The QVCO could be tuned between 1.64 and 1.97 GHz, and showed a phase noise of -140 dBc/Hz or less across the tuning range at a 3-MHz offset frequency from the carrier, for a current consumption of 25 mA from a 2-V power supply.
The equivalent phase error between I and Q signals was at most 0.25°.
| Language: | English |
|---|---|
| Publisher: | IEEE |
| Year: | 2002 |
| Pages: | 1737-1747 |
| ISSN: | 1558173x and 00189200 |
| Types: | Journal article |
| DOI: | 10.1109/JSSC.2002.804352 |
0.35 micron 1.64 to 1.97 GHz 1/f noise 1/f/sup 3/ region 2 V 25 mA CMOS LC quadrature VCO CMOS analogue integrated circuits Energy consumption Filters Frequency conversion Inductors LC-tank VCO coupling Phase noise Q factor Ring oscillators S-QVCO Transceivers UHF integrated circuits UHF oscillators Varactors Voltage-controlled oscillators coupled circuits integrated circuit design network analysis oscillation frequency phase error phase noise quadrature VCO quadrature voltage-controlled oscillator submicron CMOS process voltage-controlled oscillators
