US 11,817,875 B2
Systems and methods for removing low frequency offset components from a digital data stream
Erin C. McPhalen, Victoria (CA)
Assigned to Schneider Electric USA, Inc., Boston, MA (US)
Filed by Schneider Electric USA, Inc., Andover, MA (US)
Filed on Dec. 17, 2021, as Appl. No. 17/554,118.
Application 17/554,118 is a continuation in part of application No. 17/063,838, filed on Oct. 6, 2020, granted, now 11,245,409.
Claims priority of provisional application 62/912,918, filed on Oct. 9, 2019.
Prior Publication US 2022/0116049 A1, Apr. 14, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H03M 1/06 (2006.01); H03M 1/12 (2006.01); H03M 1/10 (2006.01)
CPC H03M 1/0626 (2013.01) [H03M 1/1023 (2013.01); H03M 1/12 (2013.01); H03M 1/1245 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A method for removing low frequency offset components from a digital data stream, comprising:
receiving, at an input of an analog-to-digital converter (ADC), an analog input signal from one or more analog front end components, the analog input signal having an associated low frequency offset due, at least in part, to the analog front end components;
generating, at an output of the ADC, a digital data stream representative of the analog input signal, the digital data stream having an associated low frequency offset due, at least in part, to the analog front end components and/or the ADC;
applying one or more low pass infinite impulse response (IIR) filters to the digital data stream to detect the low frequency offset components in the digital data stream, and generate a filtered output signal with only the low frequency offset components present;
controlling, at the output of the ADC, a first path of the digital data stream to the one or more low pass IIR filters and a second path of the digital data stream to one or more other circuits configured to capture information associated with the analog input signal; and
taking the difference of the filtered output signal from the digital data stream to generate a corrected digital data stream without the low frequency offset components.