FPGA Based Sine-Cosine Encoder to Digital Converter using Delta-Sigma Technology

Since the very beginning of position feedback control, the industries wish has been to rapidly obtain a position signal with the highest possible precision, and this of course for a reasonable price. For accurate angle and position measurements optical encoders have shown to best meet these needs. An improved method for fast and high resolution synchronous evaluation of optical encoders with sine/cosine signals is presented that further enhances position measurement. Excellent disturbance and noise suppression and at the same time high signal frequencies are the key benefits. Analog circuitry is reduced to a minimum, thus all signal processing is performed digitally.