Design and optimization of LC oscillators

Authors:
Maria del Mar Hershenson;Ali Hajimiri;Sunderarajan S. Mohan;Stephen P. Boyd;Thomas H. Lee
Affiliations:
Barcelona Design, Stanford University;California Institute of Technology;Barcelona Design, Stanford University;Stanford University;Stanford University
Venue:
ICCAD '99 Proceedings of the 1999 IEEE/ACM international conference on Computer-aided design
Year:
1999

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Abstract

We present a method for optimizing and automating component and transistor sizing for CMOS LC oscillators. We observe that the performance measures can be formulated as posynomial functions of the design variables. As a result, the LC oscillator design problems can be posed as a geometric program, a special type of optimization problem for which very efficient global optimization methods have recently been developed. The synthesis method is therefore fast, and determines the globally optimal design; in particular the final solution is completely independent of the starting point (which can even be infeasible), and infeasible specifications are unambiguously detected. We can rapidly compute globally optimal trade-off curves between competing objectives such as phase noise and power.