Output common-mode control loop for fast and smooth transition in multi-mode amplifiers
AssigneeCirrus Logic, Inc.
InventorsNishant Jain, Vamsikrishna Parupalli, Gaurav Agarwal
Life of this patent
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Abstract
A system may include a pulse-width modulation mode path configured to drive a load at an output of the system in a first mode of operation, a linear mode path configured to drive the load in a second mode of operation, a common mode control feedback loop configured to set a value of a common mode output signal at the output in the second mode of operation, and an auxiliary circuit coupled to the common mode feedback control loop and configured to maintain a state of the common mode feedback control loop during the first mode of operation as the state was or will be during the second mode of operation.
Claims10
A system comprising:
- a pulse-width modulation mode path configured to drive a load at an output of the system in a first mode of operation;
- a linear mode path configured to drive the load in a second mode of operation;
- a common mode control feedback loop configured to set a value of a common mode output signal at the output in the second mode of operation;
- and
- an auxiliary circuit coupled to the common mode control feedback loop and configured to maintain a state of the common mode control feedback loop during the first mode of operation as the state was or would be during the second mode of operation.
A method comprising, in a system including a pulse-width modulation mode path configured to drive a load at an output of the system in a first mode of operation, a linear mode path configured to drive the load in a second mode of operation, and a common mode control feedback loop configured to set a value of a common mode output signal at the output in the second mode of operation:
- maintaining, with an auxiliary circuit coupled to the common mode control feedback loop, a state of the common mode control feedback loop during the first mode of operation as the state was or would be during the second mode of operation.
Dependencies are inferred from the claim text.