design and optimization of lc oscillators

• DOI: 10.5555/339492.339574
• Publication Date: 2003-01-20
• Authors: del Mar Hershenso...; Hajimiri, Ali; Mohan, Sunderaraj...; Boyd, Stephen P.; Lee, Thomas H.
• Keywords: 0202 electrical engineering, electronic engineering, information engineering; 02 engineering and technology

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.