Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Reexamination Certificate
2005-10-18
2005-10-18
Lam, Tuan T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
C327S390000, C327S384000
Reexamination Certificate
active
06956411
ABSTRACT:
A low distortion, high frequency switch circuit for selectively coupling an input voltage terminal to an output voltage terminal includes a switching device coupled to the input voltage terminal and the output voltage terminal, a charge storage device, and a first, second and third switches. While the switch circuit is turned off, the charge storage device, typically a capacitor, is charged to a precharge voltage. Then, when the switch circuit is to be turned on, the charge storage device is coupled between the control terminal of the switching device and the input voltage terminal. As a result, the switching device receives a constant gate-to-source voltage approximately equals to the precharge voltage and becomes conductive with a minimum and constant RONfor all values of input voltages. In another embodiment, the switch circuit includes a pedestal voltage compensation circuit for reducing charge injection induced pedestal errors.
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Cook Carmen C.
Lam Tuan T.
National Semiconductor Corporation
Nguyen Hiep
Patent Law Group LLP
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