Broadband on-chip nested-loop alternating current (AC)-coupling systems and methods
AssigneeAnalog Devices, Inc.
InventorsAriel Leonardo Vera Villarroel, Ronald F. Talaga, Jr., Abdelrahman Hesham Elsayed Ahmed, Jianwei Wang
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Abstract
Various embodiments of the invention provide for an AC-coupling method and systems that utilize a nested loop circuit to generate a differential mode output that facilitates an offset compensation and a common mode output that facilitates DC-biasing of an active circuit. In embodiments, the nested loop circuit comprises a differential amplifier and a differential mode loop that generates a differential mode output and a common mode loop that uses a common mode voltage and a reference voltage to generate the common mode output.
Claims16
A nested loop circuit comprising:
- a common mode loop that, in a closed loop configuration, uses a common mode voltage and a reference voltage to generate a common mode output that facilitates DC biasing of an active circuit;
- and
- a differential mode loop that generates a differential mode output that facilitates an offset compensation,
- wherein the common mode output and the differential mode output are coupled to a high impedance converter circuit that provides a high impedance loading to an input of the active circuit.
A nested loop circuit comprising:
- a common mode loop that, in a closed loop configuration, uses a common mode voltage and a reference voltage to generate a common mode output that facilitates DC biasing of an active circuit;
- and
- a differential mode loop that generates a differential mode output that facilitates an offset compensation,
- wherein the differential mode loop is nested in the common mode loop.
A broadband amplifier circuit comprising:
- a differential amplifier;
- nested loop circuit coupled to the differential amplifier, the nested loop circuit comprising:
- a common mode loop that, in a closed loop configuration, uses a common mode voltage and a reference voltage to generate a common mode output that facilitates DC biasing of an active circuit;
- and
- a differential mode loop that generates a differential mode output that facilitates an offset compensation;
- and
- a high impedance converter circuit coupled to the nested loop circuit, the high impedance converter circuit provides a high impedance input to the differential amplifier.
An AC-coupling method comprising:
- using a nested loop circuit to generate a differential mode output, which facilitates an offset compensation and a common mode output that facilitates DC biasing of an active circuit, the nested loop circuit being coupled to a differential amplifier and comprising:
- a common mode loop that, in a closed loop configuration, uses a common mode voltage and a reference voltage to generate the common mode output;
- and
- a differential mode loop that generates the differential mode output.
Dependencies are inferred from the claim text.