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We describe a synthesis system that takes operating
range constraints and inter and intracircuit parametric manufacturing
variations into account while designing a sized and biased
analog circuit. Previous approaches to computer-aided design for
analog circuit synthesis have concentrated on nominal analog circuit
design, and subsequent optimization of these circuits for statistical
fluctuations and operating point ranges. Our approach simultaneously
synthesizes and optimizes for operating and manufacturing
variations by mapping the circuit design problem into an
Infinite Programming problem and solving it using an annealing
within annealing formulation. We present circuits designed by this
integrated synthesis system, and show that they indeed meet their
operating range and parametric manufacturing constraints. And
finally, we show that our consideration of variations during the
initial optimization-based circuit synthesis leads to better starting
points for post-synthesis yield optimization than a classical nominal
synthesis approach.
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