| 摘要 |
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. |
