Circuit Architectures Addressing Erroneous Common-Mode Voltage
AssigneeElevation Microsystems, Inc.
InventorsCelal Avci, Ferhat Ozturk, Batuhan Dogan, Emrah Peker, Emre Topcu
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Abstract
In one embodiment, an electrical circuit can include one or both of two different circuit architectures that provide robust protection against spurious common-mode signals, including common-mode degradation and transient common-mode signals. When used in electrical isolators, these circuit architectures improve common-mode signal quality over the isolation barrier and maintain signal quality by reducing common-mode degradation.
Claims12
A common-mode correction circuit comprising:
- input circuitry configured to detect a common-mode voltage of a first circuit;
- and
- a negative feedback loop circuit configured to:
- amplify a difference between (1) the detected common-mode voltage of the first circuit and (2) a correct common-mode voltage;
- and
- output the amplified difference to the first circuit.
A circuit comprising at least one common-mode rejection circuit, the common-mode rejection circuit comprising:
- a first high-pass filter coupled in series with a first input to the common-mode rejection circuit;
- a second high-pass filter coupled in series with a second input to the common-mode rejection circuit;
- a first resistor coupled (1) in series between a correct common-mode voltage Vcm and a first output of the common-mode rejection circuit and (2) in parallel with the first capacitor and the first output;
- and
- a second resistor coupled (1) in series between the correct common-mode voltage Vcm and a second output of the common-mod rejection circuit and (2) in parallel with the second capacitor and the second output.
Dependencies are inferred from the claim text.