Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2007-05-08
2007-05-08
Nguyen, Patricia (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S258000, C330S260000, C330S278000
Reexamination Certificate
active
11205653
ABSTRACT:
In one embodiment, a programmable gain instrumentation amplifier comprises an input stage configured with a differential precision current conveyor circuit. The current conveyor circuit may be implemented with operational amplifiers coupled to gain-setting resistors, with double-multiplexers configured on each end of the gain-setting resistors. In a first set of embodiments, the double-multiplexers may be bootstrapped, whereby the power supplies of each double-multiplexer may track the signals on the output pin of a respective sense-multiplexer component of the double-multiplexer. In a second set of embodiments, the power supplies may alternatively track the op-amp differential output during non-overload conditions, or the op-amp common-mode output at a gain resistor center tap during overload conditions. Corresponding bootstrap circuits may be designed for both sets of embodiments, the bootstrap circuits coupling to the respective tracking node or nodes in either case.
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Hood Jeffrey C.
Meyertons Hood Kivlin Kowert & Goetzel P.C.
National Instruments Corporation
Nguyen Patricia
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