Design and implementation of an ASIC-based four-axis position servo system

A new Application Specific Integrated Circuit (ASIC) realization of high- performance servo system of four-axis actuators is proposed. This scheme integrates four-axis position loop, velocity loop and current loop on one-chip ASIC. Furthermore, the detail implementations of basic modules such as multiple axis synchronous control strategy, M/T algorithm, Pseudo Derivative Feedback +Feedforward (PDFF) ,Proportional Integral (PI) and Proportional Integral Derivative(PID)regulating method are presented. Then a novel approach of modeling, simulation and verification of whole servo system under the unique EDA environment is realized with Verilog Hardware Description Language (HDL). This ASIC has been implemented in a 0.18 micron CMOS process, and the physical layout schematic of the proposed ASIC is showed. Simulation and experimental results show that the proposed scheme has excellent dynamic and steady-state performance.