FPGA Based Resolver to Digital Converter Using Delta-Sigma Technology
Jens Onno Krah, Marcel J. I. J. Albers · 2006
This contribution describes a new FPGA based method to convert the analog resolver signals to a digital position signal using Delta Sigma ADC technology. By using a 2 nd order ∆Σ modulator it is possible to increase the effective resolution. In a servo drive the significant better signal to noise ratio can be used to build a smoother motor current (less noisy), or to increase the tracking loop bandwidth. Due to ∆Σ modulation EMI noise from the IGBT power stage can be suppressed in an efficient way by using digital filters implemented in an FPGA.