Auto Gain Control Technique Realizing Wide-Range and Precise A/D Conversion for Dynamic Signal Sensing

There is a trade-off between resolution and acquisition range of voltage while performance of feedback control depends on the resolution. Many signals in motion control change quickly with various range and hence both of saturation avoidance and high-resolution data-acquisition are one of the challenges. This research proposes a multi-amplification technique which provides a wide-range and high-resolution A/D conversion. A high-frequency-operated circuit and a fast processor on an FPGA are developed and then a signal-processing module is designed. Experimental results show the validity of the module.