A 5 GHz quadrature relaxation oscillator with mixing for improved testability or compact front-end implementation

Authors:
Luis Bica Oliveira;Chris van den Bos;Jorge R. Fernandes;Chris J. M. Verhoeven;Manuel M. Silva
Affiliations:
INESC-ID-Universidade Nova de Lisboa, Rua Alves Redol, 9, 1000-029 Lisbon, Portugal;Systematic IC Design, Motorenweg 5G 2623 CR Delft, The Netherlands;INESC-ID-TU Lisbon, Rua Alves Redol, 9, 1000-029 Lisbon, Portugal;Delft University of Technology, Electronics Res. Lab.-Dimes, Mekelweg, 4 2628 CD Delft, The Netherlands;INESC-ID-TU Lisbon, Rua Alves Redol, 9, 1000-029 Lisbon, Portugal
Venue:
International Journal of Circuit Theory and Applications
Year:
2010

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Abstract

We demonstrate by measurements on a test circuit that a 5 GHz relaxation oscillator with accurate quadrature outputs and low phase-noise can be obtained, and that these favorable properties can be preserved while the mixing function is performed by this oscillator. This is useful either to measure the quadrature error at a low frequency, or to implement a low-intermediate frequency (IF) or zero-IF (homodyne) radio frequency front-end. Copyright © 2008 John Wiley & Sons, Ltd.