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US 4,384,257 AGranted
Storage stabilized integrator
OwnerWilliam M. Nolainventor
Life of this patent
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Abstract
An electronic integrator which is insensitive to drift because a storage and forcing circuit maintains the output voltage of the integrator at a constant level.
Claims3
The process of stabilizing an integrator circuit comprising the steps of:
- first, integrating a signal in an integrator circuit having an input terminal and an output terminal,
- second, storing the output of the integrator in a storage circuit, said storage circuit having an input and an output,
- comparing in a comparator means the outputs of the integrator circuit and the storage circuit, said comparator means having a first and second input terminal and an output terminal,
- sensing voltage differences at said first and second input terminals of said comparator means,
- signalling a drift compensator circuit means having an input and an output, said drift compensator circuit means comprising means to apply a voltage to said integrator to cause its output to match the output of the storage circuit,
- successively repeating the aforesaid process so long as the integrator is energized,
- said circuit including a normally open switch means to close upon a predetermined integrate signal cyclically applied to said integrator;
- and
- said circuit means including a normally open second switch means adapted to close to apply an output to the storage circuit, and
- simultaneously or sequentially opening said first and said second normally open switch means after each integrate cycle.
7 more elements
An integrator stabilizing circuit having a main input terminal and a main output terminal, said integrator stabilizing circuit comprising,
- an integrator means having an input and an output,
- first conductor means electrically connecting the input of the integrator and the main input,
- first normally open switch means in the first conductor means,
- a storage circuit means having an input,
- second conductor means electrically connecting the output of the integrator and the input of the storage circuit means,
- a comparator having an output and a first and second input,
- third conductor means interconnecting said first input with the output of said integrator and
- fourth conductor means interconnecting the output of said storage means and the second input of said comparator means,
- drift compensator having an input and an output, fifth conductor means connecting the output of the comparator and the input of the drift compensator means,
- sixth conductor means connecting the output of the drift compensator and the input of the integrator,
- second normally open switch means in the second conductor neans, and
- means to close the first and second switch means comprising an integrate logic circuit.
9 more elements
Dependencies are inferred from the claim text.