Method for sampling output from a grid based digitizer sensor

A computing device comprising:

• a grid based digitizer sensor comprising sensing lines;
• a digitizer circuit, the digitizer circuit comprising:
• a plurality of inverters configured to invert signals from the sensing lines of the grid based digitizer sensor;
• a plurality of Analog to Digital Converters (ADCs), each configured to sample a combination of signals from a plurality of the sensing lines, wherein the combination of signals selectively includes inverted and non-inverted signals from the plurality of sensing lines;
• and
• a multiplexer configured to selectively direct inverted and non-inverted signals from the plurality of sensing line to each of the plurality of ADCs based on coefficients of a Hadamard Matrix;
• and
• a host computer configured to post process outputs from the plurality of ADCs, wherein the post processing includes multiplying an inverse of the Hadamard Matrix with the sampled outputs from the plurality of ADCs and to detect presence of an object interacting with the grid based digitizer sensor based on the post processing.