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US 12,633,887 B2Granted
Filtering architecture with transients minimization due to temporary scaling
AssigneeInfineon Technologies AG
InventorsDietmar Straeussnigg, Florian Brame, David Andrew Russell
Life of this patent
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Abstract
A digital filter includes a delay line; coefficients coupled to the delay line; and a summer coupled to at least one of the of coefficients, wherein the coefficients each include a first value during a normal mode of operation, and wherein at least one of the coefficients comprises a second value during a transient mode of operation.
Claims21
A digital microphone comprising:
- a programmable gain amplifier (PGA);
- an analog-to-digital converter (ADC) coupled to the PGA;
- a digital filter coupled to the ADC, wherein the digital filter comprises a plurality of coefficients;
- and
- a digital gain compensation component coupled to the digital filter,
- wherein the plurality of coefficients each comprise a first value during a normal mode of operation of the digital microphone, wherein at least one of the plurality of coefficients comprises a second value during a first cycle of a transient mode of operation of the digital microphone, and wherein at least two of the plurality of coefficients comprise the second value during a second cycle of the transient mode of operation.
3 more elements
A method of operating a digital microphone, the method comprising:
- adjusting a gain of a signal path of the digital microphone, wherein the signal path comprises a programmable gain amplifier (PGA), an analog-to-digital converter (ADC) coupled to the PGA, a filter coupled to the ADC, wherein the filter comprises a plurality of coefficients, and a digital gain compensation component coupled to the filter, wherein adjusting the gain of the signal path of the digital microphone further comprises:
- setting a coefficient of the filter of the digital microphone to a first value during a normal mode of operation of the digital microphone;
- setting the coefficient of the filter of the digital microphone to a second value during a first cycle of a transient mode of operation of the digital microphone;
- and
- setting at least two coefficients of the filter of the digital microphone to the second value during a second cycle of the transient mode of operation of the digital microphone.
2 more elements
A digital microphone comprising:
- a programmable gain amplifier (PGA);
- an analog-to-digital converter (ADC) coupled to the PGA;
- a digital filter coupled to the ADC, wherein the digital filter comprises a plurality of coefficients;
- and
- a digital modulator coupled to the digital filter,
- wherein the plurality of coefficients each comprise a first value during a normal mode of operation of the digital microphone, wherein at least one of the plurality of coefficients comprises a second value during a first cycle of a transient mode of operation of the digital microphone, and wherein at least two of the plurality of coefficients comprise the second value during a second cycle of the transient mode of operation.
3 more elements
Dependencies are inferred from the claim text.