Miscellaneous active electrical nonlinear devices – circuits – and – Gating – Accelerating switching
Reexamination Certificate
2005-12-13
2005-12-13
Callahan, Timothy P. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Gating
Accelerating switching
C327S375000, C327S376000, C327S377000
Reexamination Certificate
active
06975157
ABSTRACT:
A semiconductor switching device or amplifier combined in parallel with one or more active devices defined as starter devices. A starter device is used to reduce the terminal voltage of a switching device or amplifier to a dc level below about 0.4 volts which will then allow the switching device to easily change between the on or conducting state and the off or non-conducting state. Three different starter devices are utilized. The first being a Bipolar Junction Transistor (BJT), the second a Metal Oxide Silicon Field Effect Transistor (MOSFET), and the third consisting of three normally off JFETs connected serially. Generally, a single starter device is coupled across the terminals of a semiconductor switching device or amplifier, but it is possible and sometimes advantageous to couple two or more starter devices in parallel. In a first case, a symmetrical, normally off or enhancement mode JFET is used as the switch or amplifier. A starter device coupled between source and drain of the JFET will allow operation at dc voltage levels above 0.4 volts. In a second case, an asymmetrical, normally off JFET is used as the switch or amplifier. A starter device coupled between source and drain of the JFET will allow operation at dc voltage levels above 0.4 volts. In a third case, a normally off MESFET is used as the switch or amplifier. A starter device coupled between source and drain of the MESFET will allow operation at dc voltage levels above 0.4 volts.
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Callahan Timothy P.
Lovoltech Inc.
Luu An T.
Wagner , Murabito & Hao LLP
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