A Simulation Example of SAMOC

With the device models presented in chapter 2 and the simulation techniques presented in chapter 3, SAMOC can analyze DC solutions of MOS circuits. In order to test the models and the simulation techniques, some simple circuits are selected to be analyzed by SAMOC. One of the most important circuit parts in analog CMOS circuit design is the differential amplifier. A differential amplifier is usually used in comparing two voltage signals. Typically, a differential amplifier has two inputs and its output is a function of the difference of two inputs. Most of time, the output gain is designed to be large to emphasize the difference of two inputs. One of the best differential amplifiers that can work well inside the allowed range is the wide-range transconductance amplifier presented in [mead]. The schematic of the wide-range transconductance amplifier which is constructed by 4 PMOS and 5 NMOS transistors, is shown in Fig. 1. By adding some extra code, it is possible to monitor the state change details while SAMOC is finding out the DC solution of a circuit. Table 1 shows the state changing detail of 9 MOS transistors in the wide-range transconductance amplifier shown in Fig. 1 with V+ = 1.05V and V= 1.00V.