7. Simulation Results

On the following pages simulation results for typical digital and analog circuits will be presented. These circuits have been selected to demonstrate typical problems occurring during mixed-mode device simulation. Most of these problems are related to high bias voltages and mutually coupled devices. For circuits containing only one distributed device, normally no convergence problems are encountered compared to simulations of the same device in single-mode. Except for the last circuit ($\mu$A709 OpAmp), operating points could be easily found using the new shunt conductance technique as described in Section 6.2.5. However, to obtain a solution for HD and self-heating simulations iteration schemes had to be used to successively refine the solution starting from an initial DD solution.