Digital Silicon Microphone with Configurable Sensitivity, Frequency Response and Noise Transfer Function
AssigneeInfineon Technologies AG
InventorsElmar Bach, Dietmar Straeussnigg, Andreas Wiesbauer
Life of this patent
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Abstract
In some embodiments, a microphone system includes a multi-bit delta-sigma modulator configured to be coupled to a microphone and configured to covert an output of the microphone into a first digital signal with a multi-bit resolution at a first output of the multi-bit delta-sigma modulator. The microphone system also includes a digital noise shaper coupled to the first output of the multi-bit delta-sigma modulator, and configured to convert a multi-bit digital input of the digital noise shaper into a one-bit digital signal.
Claims31
A microphone system comprising:
- a multi-bit delta-sigma modulator configured to be coupled to a microphone and configured to covert an output of the microphone into a first digital signal with a multi-bit resolution at a first output of the multi-bit delta-sigma modulator;
- a digital noise shaper coupled to the first output of the multi-bit delta-sigma modulator, and configured to convert a multi-bit digital input of the digital noise shaper into a one-bit digital signal;
- a digital filter coupled between the multi-bit delta-sigma modulator and the digital noise shaper, with an input of the digital filter coupled to the first output of the multi-bit delta-sigma modulator and an output of the digital filter coupled to an input of the digital noise shaper;
- and
- a code mapping module coupled between the multi-bit delta-sigma modulator and the digital filter.
(canceled)
(canceled)
A semiconductor device comprising:
- a multi-bit delta-sigma modulator configured to convert an output voltage of a microelectromechanical systems (MEMS) microphone into a first digital signal with a multi-bit resolution;
- and
- a digital logic coupled to the multi-bit delta-sigma modulator, the digital logic having a configuration that is reconfigurable, the digital logic comprising:
- a digital filter configured to equalize the first digital signal and having a reconfigurable configuration;
- and
- a digital interface unit configured to convert an output of the digital filter into a second digital signal with a pre-determined data format, wherein a configuration of the digital interface unit is reconfigurable:
- a storage unit configured to store first sets of coefficient for the digital filter and second sets of coefficients for the digital interface unit, wherein at least one of the first sets of coefficients and the second sets of coefficients are configured to support different sensitivity requirements of the microphone;
- a configuration module configured to load different sets of coefficients into at least one of the digital filter and the digital interface unit in accordance with the different sensitivity requirements;
- and
- a control interface for setting the sensitivity requirement of the microphone.
(canceled)
(canceled)
A method of operating a reconfigurable microphone system comprising:
- converting a first output of a microphone into a first digital signal having a multi-bit resolution using a multi-bit delta-sigma modulator;
- setting a configuration of a digital filter and setting a configuration of a digital interface unit, wherein the digital filter and the digital interface unit are reconfigurable;
- equalizing the first digital signal using the digital filter, wherein the equalizing comprises:
- applying a first gain for components of the first digital signal at a first frequency;
- and
- applying a second gain different from the first gain for components of the first digital signal at a second frequency;
- and
- converting an output of the digital filter into a second digital signal having a pre-determined bit resolution using the digital interface unit.
-30. (canceled)
Dependencies are inferred from the claim text.