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A self-calibrated LC quadrature VCO in a current-limited region
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- Authors
- Sang Jin Byun, Kwan-Woo Kim, Dong-Ho Lee, Joy Laskar, Cheon Soo Kim
- Issue Date
- 2008-06
- Citation
- Radio Frequency Integrated Circuits Symposium (RFIC) 2008, pp.379-382
- Publisher
- IEEE
- Language
- English
- Type
- Conference Paper
- Abstract
- This paper presents a self-calibrated LC quadrature VCO (LC QVCO) which operates in a current-limited region. Our steady-state phasor analysis shows that phase and amplitude errors of an LC QVCO are linearly related to each other if the LC QVCO is designed to operate in a current-limited region. Based on this linear relationship, we propose a self-calibration technique which uses a low speed amplitude error detector instead of a conventional high speed phase error detector for I/Q error compensation of an LC QVCO. As a prototype, a 2.7GHz self-calibrated LC QVCO was implemented in a 0.18um CMOS process. The LC QVCO core and the self-calibration loop consume 7.6mA and 0.4mA from a 1.8V supply, respectively, and successfully compensate for phase and amplitude errors. © 2008 IEEE.
- KSP Keywords
- 0.18um CMOS, Amplitude error, CMOS Process, Error Compensation, High Speed, Phasor analysis, Quadrature VCO, Self-Calibrated, Self-calibration, calibration technique, linear relationship