Ultrasonic transmitter, ultrasonic transceiver and sounding...

Details Ultrasonic transmitter, ultrasonic transceiver and sounding... Ultrasonic transmitter, ultrasonic transceiver and sounding...

2007-09-11

2007-09-11

Lobo, Ian J. (Department: 3662)

Communications, electrical: acoustic wave systems and devices

Transmitter systems

Reexamination Certificate

active

10857976

ABSTRACT:
A driver circuit for generating a driving signal by pulse-width modulation (PWM) includes a half-bridge circuit formed essentially of a pair of series-connected FETs. When the level of an ultrasonic signal, or of the driving signal, is to be maximized, the individual FETs are switched at a switching frequency matched to the frequency of the driving signal. When the level of the ultrasonic signal, or the driving signal is to be reduced, on the other hand, the individual FETs are switched with specific timing determined based on the frequency of a clock signal of which period is shorter than that of the driving signal.

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Hua, C., “High Switching Frequency DSP Controlled PWM Inverter”, Control Applications, 1993 Second IEEE Conference on., Sep. 13, 1993, pp. 273-281, vol. 1, Digital Object Identifier 10.1109/CCA. 1993.348276.

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