An ultrasonic system and method with adaptive overflow and gain control is provided, and the main technology of the present disclosure is to use two-stage gain controls to improve signal noise ratio (SNR) and to achieve the correct analysis of the results. The first stage uses an analog gain, and this first stage will immediately monitor whether the signal may be overflow (over flow) or the signal’s strength is too weak to adjust the gain value, not overflow as the goal, and try to amplify the gain value to improve the signal and SNR value. The second stage uses a digital gain to receive all the gained data with a gain value after all the first-stage analog gain is adjused, and gained data with a gain segment is continuously taken out the data in chronological order. The gained data with the gain segment is converted to the same gained data segment of the same gain. Finally, the same gained data segment is provided to a Doppler analyzer for analysis.一種具適應性溢滿與增益控制之超音波系統及其方法,其主要技術為使用兩階段的增益控制方式以達成提高信號訊雜比及正確分析結果。第一階段採用類比增益,此階段會即時監測信號是否可能溢滿或強度太弱來調整增益值,以不溢滿為目標,並盡量放大增益值,以提高信號訊雜比(SNR)值。第二階段採用數位增益,接收所有該第一階段類比增益調整後之所有具增益之含增益資料,並由所有資料中,依時間順序持續取出一具增益之含增益資料段,並將該具增益之含增益資料段轉換為相同增益之一相同增益資料段。最後,將該將相同增益資料段提供給都卜勒信號分析器分析。2‧‧‧具適應性溢滿與增益控制之超音波系統21‧‧‧超音波壓電片22‧‧‧都卜勒解調器23‧‧‧類比增益濾波器24‧‧‧類比數位轉換器25‧‧‧具適應性增益控制的模組26‧‧‧數位增益模組27‧‧‧都卜勒信號分析器28‧‧‧顯示器8‧‧‧類比增益調整方塊9‧‧‧數位增益調整方塊70‧‧‧低功耗藍牙
