US 12,175,040 B2 · Ultrasonic sensing devices

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.

Claims30

Dependent claims

A device for ultrasonic sensing, comprising:

a driver circuit configured to generate an ultrasonic signal;
a piezoelectric element having a first electrode and a second electrode, the piezoelectric element coupled with the driver circuit with the first electrode, and for receiving a reflected ultrasonic signal in response to the ultrasonic signal;
a blocking transistor configured to connect the piezoelectric element with the second electrode to a fixed bias voltage, wherein 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 control signal, the blocking transistor is configured to be turned on within a transmission period and to be turned off within a receiving period;
and
a source rectifier including a gate, a drain, and a source, the source of the source rectifier being directly connected to the piezoelectric element and the blocking transistor.

2 more elements

A device for ultrasonic sensing, comprising:

a piezoelectric element configured to receive a reflected ultrasonic signal;
a blocking transistor configured to connect the piezoelectric element to ground, wherein the blocking transistor is configured to be turned on within a transmission period, and to be turned off within a receiving period;
and
a source rectifier including a gate, a drain, and a source, the source of the source rectifier being directly connected to the piezoelectric element and the blocking transistor;
and
a sink rectifier including a gate, a drain, and a source, the source of the sink rectifier being directly connected to the piezoelectric element and the blocking transistor.

3 more elements

An ultrasonic sensing device, comprising:

a piezoelectric element configured to receive a reflected ultrasonic signal, the piezoelectric element having an electrode;
a blocking transistor configured to connect the electrode of the piezoelectric element to a fixed voltage, wherein the blocking transistor is configured to be turned on within a transmission period, and to be turned off within a receiving period;
a first amplifier having a first input terminal connected to the electrode of the piezoelectric element and the blocking transistor, a second input terminal, and an output terminal;
a source rectifier including a gate directly connected to the output terminal of the first amplifier, a drain, and a source directly connected to the second input terminal of the first amplifier;
and
a sink rectifier including a gate electrically connected to the gate of the source rectifier, a drain, and a source directly connected to the source of the source rectifier.

3 more elements

Dependencies are inferred from the claim text.

Ultrasonic sensing devices

Life of this patent

Ultrasonic sensing devices

Life of this patent

Abstract

Claims30