US 12,170,874 B2
Digital non-linearity compensation in a silicon microphone
Dietmar Straeussnigg, Villach (AT); Niccoló De Milleri, Villach (AT); Hong Chen, Villach (AT); Simon Gruenberger, Moosburg (AT); and Andreas Wiesbauer, Poertschach (AT)
Assigned to INFINEON TECHNOLOGIES AG, Neubiberg (DE)
Filed by Infineon Technologies AG, Neubiberg (DE)
Filed on Feb. 18, 2022, as Appl. No. 17/675,801.
Prior Publication US 2023/0269534 A1, Aug. 24, 2023
Int. Cl. H04R 3/06 (2006.01); H03M 1/12 (2006.01); H04R 3/02 (2006.01); H04R 19/04 (2006.01)
CPC H04R 3/06 (2013.01) [H03M 1/12 (2013.01); H04R 3/02 (2013.01); H04R 19/04 (2013.01); H04R 2201/003 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A digital microphone comprising:
an analog-to-digital converter (ADC) for receiving an analog input signal;
a DC blocker component coupled to the ADC;
a digital low pass filter coupled to the DC blocker component; and
a nonlinear compensation component coupled to the digital low pass filter for providing a digital output signal,
wherein a transfer function of the nonlinear compensation component comprises a second order polynomial, and wherein the nonlinear compensation component comprises a multiplier coupled to an input of the nonlinear compensation component, a gain stage coupled to an output of the multiplier, and an adder coupled to an output of the gain stage and coupled to the input of the nonlinear compensation component.