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US 10,476,483 B2Granted
Decimation filter
AssigneeInfineon Technologies AG
InventorsDietmar Straeussnigg, Peter Bogner, Michael Kropfitsch, Jens Barrenscheen
Life of this patent
Estimating the term…
Abstract
Filters are discussed where a first window function and a second window function are applied to a digital input signal, wherein a window length of the first window function is longer than a window length of the second window function. The results of this windowing are integrated.
Claims19
A device, comprising:
- a windowing circuit configured to apply a first window function to a first digital signal to generate a second digital signal and to apply a second window function to the first digital signal to generate a third digital signal, wherein a window length of the first window function is longer than a window length of the second window function,
- a first integrator configured to receive the second digital signal,
- a second integrator configured to receive the third digital signal,
- an analog-to-digital converter configured to output the first digital signal based on a received analog signal,
- a chopping circuit configured to apply a chopping signal at an input of the analog-to-digital converter and at an output of the second integrator, and
- an offset compensation circuit configured to estimate an offset of the first digital signal based on an output signal of the second integrator and the applied chopping signal, and to compensate the estimated offset in an output signal of the first integrator.
3 more elements
A device, comprising:
- a first decimation path configured to provide a first decimated signal based on an input signal,
- a second decimation path configured to provide a second decimated signal based on the input signal, wherein the second decimation path has a faster response to a change in the input signal than the first decimation path, and
- an offset compensation circuit configured to estimate an offset of the input signal by applying chopping to the second decimation path and to compensate the estimated offset in the first decimation path.
A method, comprising:
- converting an analog signal to a first digital signal,
- applying a first window function to the first digital signal to generate a second digital signal,
- applying a second window function to the first digital signal to generate a third digital signal, wherein a window length of the second window function is shorter than a window length of the first window function,
- integrating the second digital signal or a signal derived therefrom to generate a fourth digital signal,
- integrating the third digital signal or a signal derived therefrom to generate a fifth digital signal,
- applying a chopping signal to the analog signal and to the fifth digital signal,
- estimating an offset of the first digital signal based on the fifth digital signal and the applied chopping signal, and
- compensating the estimated offset in the fourth digital signal.
5 more elements
Dependencies are inferred from the claim text.