| 摘要 |
The present invention discloses an oscillating device for frequency detection, an ultrasonic transceiver system and a frequency detection method thereof. The oscillating device for frequency detection, which is applicable for detecting a transducer having a lowest impedance frequency and a highest impedance frequency, comprises an oscillating circuit. The oscillating circuit has a loop gain whose maximum value occurs at the lowest impedance frequency of the transducer and whose minimum value occurs at the highest impedance frequency of the transducer, wherein a difference of a phase of the loop gain and an impedance phase of the transducer is zero between the lowest impedance frequency and the highest impedance frequency, and the loop gain is of a value greater than 1 at a frequency where the phase difference is zero.
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