On the amplitude and phase errors of quadrature LC-tank CMOS oscillators
Author
Summary, in English
An analytic approach for the estimation of the phase and amplitude imbalances caused by component mismatches and parasitic magnetic fields in two popular quadrature LC oscillators is presented. Very simple and closed-form equations are derived, proving that, although the two topologies share the same small signal circuit, they display very different sensitivities to the mentioned sources of imbalance. Moreover, it is shown that parasitic inductors coupling, overlooked up to date, plays a key role ultimately limiting the achievable phase accuracy. The theoretical results are verified through extensive simulations and measurements on a 1.7-GHz quadrature oscillator and frequency up-converter implemented in a 0.18-/spl mu/m CMOS process.
Publishing year
2006
Language
English
Pages
1305-1313
Publication/Series
IEEE Journal of Solid-State Circuits
Volume
41
Issue
6
Links
Document type
Journal article
Publisher
IEEE - Institute of Electrical and Electronics Engineers Inc.
Topic
- Electrical Engineering, Electronic Engineering, Information Engineering
Keywords
- CMOS radio frequency integrated circuits image rejection local oscillators phase accuracy quadrature voltage-controlled oscillators (QVCOs)
Status
Published
ISBN/ISSN/Other
- ISSN: 0018-9200