ULTRASONIC SENSING DEVICES
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United States of America Patent
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Issued Date -
Nov 23, 2023
app pub date -
Jan 11, 2023
filing date -
May 19, 2022
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Abstract
The present disclosure provides a device for ultrasonic sensing, which includes a driver circuit configured to generate an ultrasonic signal, a piezoelectric element having a first electrode and a second electrode, a blocking transistor configured to connect the piezoelectric element with the second electrode to a fixed bias voltage, and a source rectifier including a gate, a drain, and a source electrically connected to the piezoelectric element and the blocking transistor. The piezoelectric element is coupled with the driver circuit with the first electrode. The blocking transistor includes a gate for receiving a blocking control signal, a drain electrically connected to the second electrode of the piezoelectric element, and a source electrically connected to the fixed bias voltage, wherein, in response to the blocking signal, the blocking transistor is configured to be turned on within a transmission period and to be turned off within a receiving period.
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