Tracking and correcting gain of open-loop driver in a multi-path processing system
AssigneeCirrus Logic, Inc.
InventorsAmar Vellanki, Tejasvi Das, John L. Melanson
Life of this patent
Estimating the term…
Abstract
A multi-path subsystem may include a first processing path, a second processing path, a mixed signal return path, and a calibration engine configured to: estimate and cancel a direct current (DC) offset of the mixed signal return path, estimate and cancel a DC offset between the first processing path and the second processing path, estimate and cancel a phase difference between the first processing path and a sum of the second processing path and the mixed signal return path, estimate and cancel a return path gain of the mixed signal return path, and track and correct for a gain difference between the first processing path and the second processing path.
Claims26
A multi-path subsystem comprising:
- a first processing path;
- a second processing path;
- a mixed signal return path;
- and
- a calibration engine configured to:
- estimate and cancel a first direct current (DC) offset of the mixed signal return path;
- estimate and cancel a second DC offset between the first processing path and the second processing path;
- estimate and cancel a phase difference between the first processing path on one hand and the sum of the second processing path and the mixed signal return path on the other hand;
- estimate and cancel a return path gain of the mixed signal return path;
- and
- track and correct for a gain difference between the first processing path and the second processing path.
A method for calibrating gain in a multi-path subsystem having a first processing path, a second processing path, and a mixed signal return path, the method comprising:
- estimating and cancelling a first direct current (DC) offset of the mixed signal return path;
- estimating and cancelling a second DC offset between the first processing path and the second processing path;
- estimating and cancelling a phase difference between the first processing path and a sum of the second processing path and the mixed signal return path;
- estimating and cancelling a return path gain of the mixed signal return path;
- and
- tracking and correcting for a gain difference between the first processing path and the second processing path.
Dependencies are inferred from the claim text.