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  ProMOST transistor optimization software

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About ProMOST

ChipDesignWorks' ProMOST is a single transistor optimizer targeting analog and RF circuit designers, mainly for CMOS technologies. ProMOST is meant to be used as fast desktop calculator that lets designed quickly estimate optimum bias settings and optimum device sizes, per device. This results in extreme fast designing and dimensioning (or porting) circuits, or in extremely quickly identify bottlenecks in your design. ProMOST lets you

ProMOST supports many transistor models, including many MOS11, PSP and BSIM models and compound models (consisting of at least one transistor, diodes, passives, ...). ProMOST is developed for use in industry, and as such currently used within a number of major electronics companies and design houses worldwide. ProMOST software runs on Linux machines, either stand-alone or integrated in Cadence.

ProMOST allows fast optimization of circuits, speeds up the design phase for circuit and can (especially in later design stages) be operated in tandem with conventional circuit simulators. Our goal is to significantly speed up the design process, and provide insight to the circuit designer. This speed aspect is also reflected in the fact that ProMOST does not have "calculate" or "run" button: everything is calculated (almost) directly after changing a setting, sweep mode, operating condition....

ProMOST requires and further improves designers'knowledge on target functioning and target performance of a transistor in a circuit schematic. This may be its function as current source, with voltage headroom limitations and requirements on noise, output impedance and current. Using these constraints, ProMOST enables a designer to quickly optimize this transistor. This process can be repeated for other transistors that may have completely different conditions, limitations and requirements. Doing so, the designer will get more in depth knowledge on the (feasible) circuit performance AND the design process is significantly sped up.

The design speed improvement using ProMOST is twofold. Firstly, individually optimizing transistors in a circuit consisting of $N$ (unique) transistors, where each transistor has $M$ parameters to optimize, yields an $M^N$-dimensional optimization problem. Already for relatively small circuit schematic this yields very high dimensional optimization challenges that consume a significant amount of time and computational power. Using ProMOST, the $N$ (unique) transistors are optimized one-by-one. This way the designer optimizes $N$ times a low-dimensional problem which is much easier, much faster and typically yields a better result. Using ProMOST yields better designs in less time.
   Added to this, ProMOST is an extremely fast optimization/analysis tool for single transistors thereby also significantly speeding up the optimization of single transistors. This can be leveraged both in the initial stages of the design to quickly arrive at a good design, or during further optimization or in pinpointing performance bottle necks in later stages of the design process.

ProMOST is (by default) operated from a GUI that lets you select the process, transistor type, corner and temperature (in the lower right hand side corner). The bias settings and device dimensions can be specified in the upper right hand side corner. Extra instance settings such as stress parameters can be set in another input panel. After starting ProMOST from within Cadence, component parameters and nbias settings (from various runs) can be copied between ProMOST and the schamtic entry window (Artist) of Cadence.

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The default output is shown on the left hand side of the GUI. this output includes OP data, noise data, mismatch data and includes a pane that shows some parameters in (constrained or unconstrained) sweeps. This offers many options to designers to pick optimum settings for the transistor.

ProMOST come with addins that show more in-depth or more advanced sweeps and thereby lets designers to optimize also for those properties. This includes properties such as distortion, IIP, OIP, s-parameters and more. Also an addin that allows to set other transistor configurations is provided.

 

News & updates

On average every year we deploy an update of ProMOST, with bug fixes, added features, added transistor models, or with performance enhancements. A full update log is provided with each software distribution package.