Digital capacitive isolator
Number of patents in Portfolio can not be more than 2000
United States of America
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Jan 18, 2022
Grant Date -
Feb 4, 2021
app pub date -
Jul 30, 2019
filing date -
Jul 30, 2019
priority date (Note) -
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Abstract
An isolation circuit that isolates a driver circuit that is biased at a first common mode voltage from a detection circuit that is biased at a second common mode voltage using isolation capacitors. The detection circuit includes a transimpedance amplifier having improved susceptibility to transient common-mode input signals and improved insensitivity to parasitic capacitance on the isolation capacitor terminals. Included within the transimpedance amplifier are circuits for mirroring current to convert the input current from the isolation capacitors into a voltage value and to amplify that voltage value. The transimpedance amplifier outputs a differential voltage value that is held by a latch circuit so that a comparator in the detection circuit can process the differential voltage value and output a differential signal with fully restored logic levels.
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