Proceedings of the 1998 IEEE/ACM international conference on Computer-aided design
MAELSTROM: efficient simulation-based synthesis for custom analog cells
Proceedings of the 36th annual ACM/IEEE Design Automation Conference
MOSFET Modeling and Bsim3 User's Guide
MOSFET Modeling and Bsim3 User's Guide
The sizing rules method for analog integrated circuit design
Proceedings of the 2001 IEEE/ACM international conference on Computer-aided design
AMGIE-A synthesis environment for CMOS analog integrated circuits
IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems
Operating-point driven formulation for analog computer-aided design
Analog Integrated Circuits and Signal Processing
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DC operating point computation is inescapable for both knowledge-based and simulation-based analog synthesis. In this perspective, this article presents the automatic computation of DC operating point and the¿generation of suitable design plans for analog IPs. The analog IP is built as a hierarchy of subcircuits inside our dedicated framework CAIRO+. Leaf subcircuits are known as devices and higher-level subcircuits are known as modules. Each subcircuit is represented by a dependency graph. The¿dependency graph expresses electrical dependencies of circuit parameters on a selected set of design parameters. The dependency graph of the analog IP is constructed, in a hierarchical bottom-up approach, by merging graphs of children devices and modules. The graph is converted to a directed acyclic graph (DAG) by detecting and removing existing directed cycles. The resulting DAG is the design plan for the analog IP. Upon construction, the DAG is executed, in a top-down approach, to compute the DC operating point and the dimensions of the transistors. The computed DC operating point is compared to a DC simulation to ensure its correctness. The proposed methodology has been successfully applied to size and bias two analog IPs: a single-ended two-stage operational amplifier and a␣differential cascode current-mode integrator. The results prove the efficiency and accuracy of the proposed methodology.