Title:
CIRCUIT AND METHOD FOR CONTROLLING A DYNAMIC, BI-DIRECTIONAL HIGH VOLTAGE ANALOG SWITCH AND ULTRASOUND EXAMINATION APPARATUS EQUIPPED WITH SUCH A CIRCUIT
Document Type and Number:
WIPO Patent Application WO2002075924
Kind Code:
A3
Abstract:
A circuit and method for controlling a switch is provided. Specifically, the circuit and method of the present invention provide a level shifter (12) that controls a dynamic, bi-directional high voltage analog switch (14). The level shifter generally includes transistors, input terminals, a voltage source, a high negative voltage source, and a diode. The configuration of the level shifter, inter alia, allows the switch to be kept ON without a current/signal, prevents dissipation of transistors of the level shifter, and provides constant gate-to-source voltage on the switch transistors for improved linearity. The circuit is advantageously used in a scanhead connected to an ultrasound examination apparatus.
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Inventors:
DUFORT BENOIT
Application Number:
PCT/IB2002/000825
Publication Date:
December 27, 2002
Filing Date:
March 18, 2002
Export Citation:
Assignee:
KONINKL PHILIPS ELECTRONICS NV (NL)
International Classes:
H03F3/34; H03K17/0412; H03K17/00; H03K17/06; H03K17/687; (IPC1-7): H03K17/687; A61B8/00
Foreign References:
| US4500802A | 1985-02-19 | |||
| EP0321702A2 | 1989-06-28 | |||
| EP0398170A2 | 1990-11-22 | |||
| US5371415A | 1994-12-06 | |||
| US5841297A | 1998-11-24 |
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