A digital double closed-loop control circuit of phase and amplitude based on resonant biomimetichair flow sensor is designed. The basic working principle of the sensor and the control principle of the double closedloop of phase and amplitude are introduced. The proposed sensor control scheme is based on the digital phaselocked loop and the digital amplitude stable closed-loop system. The control system model is built in SIMULINK
the feasibility of the control scheme is verified. Flow velocity experiments are carried out
which shows that the circuit can track the resonant frequency of the sensor resonator in real-time and the driving amplitude is stable.The experimental results confirm that the flow sensor has a detection-limit of 2. 32 mm/s.