Journal article
On the phase-noise and phase-error performances of multiphase LC CMOS VCOs
This paper presents an analysis of phase noise in multiphase LC oscillators, and measurement results for several CMOS quadrature-voltage-controlled-oscillators (QVCOs) working in the 2-GHz frequency range. The phase noise data for a so-called BS-QVCO (- 140 dBc/Hz or less at 3 MHz frequency offset from the carrier, for a power consumption of 20.8 mW and a figure-of-merit of 184 dBc/Hz) show that phase noise performances are close to the previously derived limits.
A systematic cause of departure from ideal quadrature between QVCO signals is also analyzed and measured experimentally, and a compact LC-tank layout that removes this source of phase error is proposed. A TS-QVCO designed with this technique shows a phase-noise figure-of-merit improvement of 4 dB, compared to a previous implementation.
The measured equivalent phase error for all QVCOs is between 0.6degrees and 1degrees.
| Language: | English |
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| Publisher: | IEEE |
| Year: | 2004 |
| Pages: | 1883-1893 |
| ISSN: | 1558173x and 00189200 |
| Types: | Journal article |
| DOI: | 10.1109/JSSC.2004.835828 |
2 GHz 20.8 mW 3 MHz BS-QVCO CMOS integrated circuits Energy consumption Frequency measurement LC-tank layout Noise generators Noise measurement Phase measurement Phase noise QVCO signals RF signals Signal analysis Signal generators UHF integrated circuits Voltage-controlled oscillators figure-of-merit multiphase LC oscillators phase-error performances phase-noise power consumption quadrature-voltage-controlled-oscillators voltage-controlled oscillators
