FPGAs are an increasing alternative for implementing signal processing in Mechatronics. But unfortunately they lack an on-chip ADC. This paper presents the approach and results of a bit serial implementation of a reconfigurable Delta-Sigma ADC using Texas Instrument's four channel Delta-Sigma-Modulator ADS1204. Filtering and decimation is accomplished in three stages by different filter types. The implementation has been done on a Xilinx Virtex4 using VHDL for specification. Bit serial arithmetic has been used to reduce implementation cost.
Field Programmable Gate Arrays provide an excellent opportunity to implement drive control functionalities in a highly flexible environment. This paper presents the FPGAbased implementation of a partially reconfigurable drive control system for DC motors. The controller supports the run-time reconfiguration of control functions and algorithms directly in hardware and meets hard real-time conditions. Features of the drive control system include test functions, a proportional plus integral closed-loop speed control, a PWM output and a USB 2.0 interface for communication purposes. In addition, the drive controller comprises a fast on-chip reconfiguration solution using an on-chip configuration interface (ICAP) and direct memory access. A Xilinx Virtex-II FPGA was used for this implementation.
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