A Reconfigurable Delta-Sigma ADC

Abstract

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.

Software Programmable ADC and DAC interfaces in VHDL

“…In order to reduce the space and power, an FPGA based systems is proposed, where all the digital functionalities are implemented on an FPGA [3]. All the analog circuitry is kept external with proper interface to the processor within the FPGA [4]. The system will be realized using Xilinx Virtex 5-Fx series FPGA, where the PowerPC 440 processor core is established.…”