Back to results
US 9,071,268 B1Granted
Multi-path analog front end and analog-to-digital converter for a signal processing system
AssigneeCirrus Logic, Inc.
InventorsEdmund Mark Schneider, Aniruddha Satoskar, Daniel J. Allen, Seyedeh Maryam Mortazavi Zanjani
Life of this patent
Estimating the term…
Abstract
A processing system may include multiple selectable processing paths for processing an analog signal in order to reduce noise and increase dynamic range. Techniques are employed to transition between processing paths and calibrate operational parameters of the two paths in order to reduce or eliminate artifacts caused by switching between processing paths.
Claims12
A processing system comprising:
- a plurality of processing paths including a first processing path and a second processing path, wherein:
- the first processing path comprises a first analog front end and a first digital processing subsystem having a first analog-to-digital converter, wherein the first analog front end is configured to amplify an analog input signal in order to generate a first amplified analog signal and the first analog-to-digital converter is configured to convert the first amplified analog signal into a first digital signal, and further wherein the first analog-to-digital converter comprises a first modulator configured to receive the first amplified input signal and a first digital decimator configured to receive an output of the first modulator;
- and
- the second processing path comprises a second analog front end and a second digital processing subsystem having a second analog-to-digital converter, wherein the second analog front end is configured to amplify the analog input signal to generate a second amplified analog signal and the second analog-to-digital converter is configured to convert the second amplified analog signal into a second digital signal, further wherein the second analog-to-digital converter comprises a second modulator configured to receive the second amplified input signal and a second digital decimator configured to receive an output of the second modulator, and further wherein a magnitude of the gain of the second analog front end is substantially larger than a magnitude of a gain of the first analog front end;
- and
- a controller configured to switch selection from the second digital signal to the first digital signal based on the output of the second modulator.
3 more elements
A method comprising:
- processing an analog input signal with a first processing path, wherein the first processing path comprises a first analog front end and a first digital processing subsystem having a first analog-to-digital converter, wherein the first analog front end is configured to amplify the analog input signal in order to generate a first amplified analog signal and the first analog-to-digital converter is configured to convert the first amplified analog signal into a first digital signal, and further wherein the first analog-to-digital converter comprises a first modulator configured to receive the first amplified input signal and a first digital decimator configured to receive an output of the first modulator;
- processing the analog input signal with a second processing path, wherein the second processing path comprises a second analog front end and a second digital processing subsystem having a second analog-to-digital converter, wherein the second analog front end is configured to amplify the analog input signal to generate a second amplified analog signal and the second analog-to-digital converter is configured to convert the second amplified analog signal into a second digital signal, further wherein the second analog-to-digital converter comprises a second modulator configured to receive the second amplified input signal and a second digital decimator configured to receive an output of the second modulator, and further wherein a magnitude of the gain of the second analog front end is substantially larger than a magnitude of a gain of the first analog front end;
- switching selection from the second digital signal to the first digital signal based on the output of at least one of the output of the second modulator;
- and
- switching selection from the first digital signal to the second digital signal based on the output of at least one of the output of the first modulator and the output of the second modulator.
2 more elements
Dependencies are inferred from the claim text.