Instrumentation input systems
AssigneeAnalog Devices, Inc.
InventorBarrie Gilbert
Life of this patent
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Abstract
An input stage for an instrumentation system may include a resistor coupled between an input terminal and a summing node, and an amplifier arranged to maintain the voltage at the summing node. In anther embodiment, an instrumentation input system may include an input stage to receive a signal to be measured, and a variable gain amplifier having an input coupled to an output of the input stage, wherein the variable gain amplifier comprises two or more gain stages. A variable gain amplifier may include an attenuator having an input and a series of tap points and a series of low-inertia switches to steer outputs from the attenuator to an output terminal.
Claims12
An input system for an instrumentation system, the input system comprising:
- an input stage to receive a signal to be measured;
- and
- a variable gain amplifier having an input coupled to an output of the input stage;
- wherein the variable gain amplifier comprises two or more gain stages;
- wherein each of the two or more gain stages provides a low pass filter pole to the overall input system response;
- and
- wherein each of the two or more gain stages comprises a fixed gain amplifier and a variable attenuator.
An input system for an instrumentation system, the input system comprising:
- an input stage to receive a signal to be measured;
- and
- a variable gain amplifier having an input coupled to an output of the input stage;
- wherein the variable gain amplifier comprises two or more gain stages;
- and
- wherein the two or more gain stages comprise:
- an attenuator having an input and a series of tap points;
- and
- a series of low-inertia switches, each switch coupled to a corresponding one of the tap points to steer outputs from the attenuator to an output terminal.
Dependencies are inferred from the claim text.