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Level-locked loop: a technique for broadband quadrature signal generation

Navid, Saeed and Behbahani, Farbod and Fotowat, Ali and Hajimiri, Ali and Gaethke, Rainer and Delurio, Micheal (1997) Level-locked loop: a technique for broadband quadrature signal generation. In: Proceedings of the IEEE 1997 Custom Integrated Circuits Conference. IEEE , Piscataway, NJ, pp. 411-414. ISBN 0-7803-3670-4

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A method for precise wideband quadrature signal generation is presented. A divide-by-2 stage forms an adjustable phase quadrature signal generator. Its output phase error is converted to an error signal, which feeds back to the quadrature signal generator through an integrator, to correct the output phase difference. Using this method, a phase accuracy better than 0.5° is achieved over 40 MHz to 500 MHz of output frequency without any external tuning. The loop compensates for any circuit and layout mismatches, is not sensitive to distorted input LO signals, and has no inherent high frequency limitation.

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Additional Information:© 1997 IEEE. Date of Current Version: 06 August 2002. Authors wish to thank M. Gholipour, A. Tabatabaie, S. Shah-Heidari, A. Arefpur, and A. Khalili-Azad for their contribution in the project and Mark Judson for the measurements.
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INSPEC Accession Number5730320
Record Number:CaltechAUTHORS:20120125-112220383
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Official Citation:Navid, S.; Behbahani, F.; Fotowat, A.; Hajimiri, A.; Gaethke, R.; Delurio, M.; , "Level-locked loop: a technique for broadband quadrature signal generation," Custom Integrated Circuits Conference, 1997., Proceedings of the IEEE 1997 , vol., no., pp.411-414, 5-8 May 1997 doi: 10.1109/CICC.1997.606656 URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:28961
Deposited By: Tony Diaz
Deposited On:26 Jan 2012 00:24
Last Modified:26 Jan 2012 00:24

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