TIME-OF-FLIGHT GENERATING CIRCUIT AND CHIP, FLOW METER AND METHOD OF THE SAME

The application discloses a time-of-flight (TOF) generating circuit (100), coupled to a first transducer (102) and a second transducer (104), wherein the first transducer and the second transducer are arranged in a pipeline (120) filled with fluid. The TOF generating circuit includes a first transmitter (106) and a first receiver (108), a second transmitter (110) and a second receiver (112), a signal generating circuit (114), a correlation circuit (116), and a processing circuit (118). Under different ambient factors, the signal generating circuit generates, respectively, a first signal and a second signal, which are received by the second receiver and the first receiver to generate a first receiving signal (RS1) and a second receiving signal (RS2), respectively. The correlation circuit performs a correlation operation to generate a first correlation signal (CS1). The processing circuit generates the TOF variation according at least to the first correlation signal (118).