A bias-driven approach to improve the efficiency of automatic design optimization for CMOS OP-Amps

The equation-based analog design automation is getting popular in last decade to search the optimal solutions with good efficiency. However, due to the deep-submicron effects, significant modeling errors often exist in major transistor parameters like g_ds and g_m. This often results in wrong prediction of circuit performance and leads to several redesign cycles to meet the specifications. Instead of building complex parameter models for g_ds and g_m, this paper adopts the g_m/I_d design concept, which is an independent value to the device size, on equation-based optimization to solve the accuracy issue. Without the complex effects from W and L, the modeling accuracy of transistor parameters is significantly improved. No more iteration is required by using the proposed approach, which improves the efficiency as well as the accuracy. To the best of our knowledge, this is the first work that adopts the internal voltages instead of device sizes as the unknown variables to be solved. As demonstrated on several circuits with different objectives, both the accuracy and efficiency of circuit optimization can be improved significantly.