Computer-based design of analog integrated CMOS-Circuits

In this paper a software design tool is presented that supports the designer in the development process of integrated MOS circuits. Here the general difficulty to find out the right parameter set of all devices in the circuit is split into small device-level tasks, so the designer is able to interactively compute proper W & L geometries of each single MOS-device. Starting with the common dilemma in the design of integrated analog MOS-circuits with conventional design software, the approach is described to find out the right parameters at transistor-level. Operating point determinations expose some parasitic effects of modem MOS-devices, which complicate the process of design. Using the presented computer-program the designer directly experiences the dependencies of the transistor-parameters and their couplings among each other by interactive modifications of the design variables.