Integrated low-voltage transmit/receive switch for...

Surgery – Diagnostic testing – Detecting nuclear – electromagnetic – or ultrasonic radiation

Reexamination Certificate

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C310S317000

Reexamination Certificate

active

10749977

ABSTRACT:
A low-voltage transmit/receive switch that acts to protect sensitive low-voltage electronics from high-voltage pulse signals used to drive an ultrasonic transducer. The low-voltage transmit/receive switch comprises a series resistor and a parallel MOSFET pair. The parallel MOSFETs are low-voltage devices. The low-voltage transmit/receive switch is placed between the output of a high-voltage pulser and the input of a receive pre-amplifier. If dual high- and low-voltage pulsers are used, then the low-voltage pulser is connected so that it is also protected from the high-voltage pulse signals by the low-voltage transmit/receive switch. In an alternative embodiment, the low-voltage pulser and the receive pre-amplifier are protected from the high-voltage pulse signals by a high-voltage transmit/receive switch.

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patent: 5740806 (1998-04-01), Miller
patent: 5744898 (1998-04-01), Smith et al.
patent: 6380766 (2002-04-01), Savord
patent: 6540677 (2003-04-01), Angelsen et al.
patent: 6540682 (2003-04-01), Leavitt et al.
patent: 6589180 (2003-07-01), Erikson et al.
patent: 6759888 (2004-07-01), Wodnicki
patent: 6856175 (2005-02-01), Wodnicki
patent: 6956426 (2005-10-01), Wodnicki

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