A CMOS digitized wind transducer implemented by wind speed to frequency converter with calibration circuits

In this paper, a CMOS digitized wind transducer implemented by wind speed to frequency converter with calibration circuits is newly proposed. A calibration technique is proposed in this work. Another innovation is that the outputs of the proposed chip are directly digitized, they could be easily sent over a wide range of transmission media, such as PSN, radio, optical, IR, ultrasonic, and etc. Before performing the proposed calibration circuits, the maximum linear error is 71.6%. After calibration, the maximum linear error is reduced to 4.87%. The wind speed range is 2.5 to 3.8 m/s, and the corresponding output frequency range is 27.87 kHz to 139.2 kHz. The chip area is 1.08 × 1.08 mm. The proposed chip is suitable for devices of measuring wind speed.