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US 9,148,164 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
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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.
Claims10
A processing system comprising:
- a plurality of processing paths including a first processing path and a second processing path, wherein:
- the first processing path has a first path gain and is configured to generate a first analog signal based on an analog input signal;
- and
- the second processing path has a second path gain and is configured to generate a second analog signal based on the analog input signal;
- and
- a controller configured to:
- select one of the first digital signal and the second digital signal as a digital output signal of the processing system based on a magnitude of the analog input signal;
- determine a scale factor indicative of the magnitude of difference between first path gain and second path gain;
- and
- prior to switching selection between the first digital signal and the second digital signal, apply an additional gain based on the scale factor to one or both of the first path gain and the second path gain to compensate for the magnitude of difference between the first path gain and the second path gain.
7 more elements
A method comprising:
- processing an analog input signal by a first processing path having a first path gain and configured to generate a first analog signal based on an analog input signal;
- processing the analog input signal by a second processing path having a second path gain and configured to generate a second analog signal based on the analog input signal;
- selecting one of a first digital signal and a second digital signal as a digital output signal of a processing system based on a magnitude of the analog input signal;
- determining a scale factor indicative of the magnitude of difference between first path gain and second path gain;
- and
- prior to switching selection between the first digital signal and the second digital signal, applying an additional gain based on the scale factor to one or both of the first path gain and the second path gain to compensate for the magnitude of difference between the first path gain and the second path gain.
3 more elements
Dependencies are inferred from the claim text.