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On the amplitude and phase errors of quadrature LC-tank CMOS oscillators

In English

Författare

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.

Publiceringsår

2006

Språk

Engelska

Sidor

1305-1313

Publikation/Tidskrift/Serie

IEEE Journal of Solid-State Circuits

Volym

41

Issue

6

Dokumenttyp

Artikel i tidskrift

Förlag

IEEE - Institute of Electrical and Electronics Engineers Inc.

Ämne

  • Electrical Engineering, Electronic Engineering, Information Engineering

Nyckelord

  • CMOS radio frequency integrated circuits image rejection local oscillators phase accuracy quadrature voltage-controlled oscillators (QVCOs)

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0018-9200