PID control with 32-bit RISC microprocessors

With the reduction of the cost and the increase in performance of digital microprocessors, many system designers are performing both system control and signal processing with the same microcontroller. In order to do this, the system designer must evaluate what performance is needed to control the system and what is needed to perform the signal processing. One method of system requirements is to determine how many MIPS (million instructions per second) are needed to complete the control tasks and how many MIPS are required to perform the signal processing. These values are combined to produce total MIPS required for the system. RISC microprocessors are able to perform DSP algorithms because of their high operating frequencies and multiple units. They are not a solution for all systems. In systems with complex signal processing, a dedicated DSP processor may offer a better price/performance solution