Patent ID: 9172388
Filing Date: 2015-10-27
Classification: H03M

Abstract:
1. An analog to digital conversion device with DC offset mismatch compensation, comprising: a composite analog to digital converter (ADC) characterized by a system sampling rate S and including N interleaved sub-ADCs, a DC offsets accumulator having an input connected to the output of the ADC and an output, said DC offsets accumulator being adapted to measure and provide at its output, a DC offset of each partial converted digital signal provided at the output of the ADC, an averaging unit having an input connected to the output of the DC offsets accumulator, and an output, wherein the averaging unit is responsive to the measurements provided at the outputs of the DC offsets accumulator, to calculate and provide at an averaging unit output, a value corresponding to an average value of the measured DC offsets of the respective partial converted digital signals; a subtraction unit having a DC offsets input connected to the outputs of the DC offsets accumulator, an average value input connected to the output of the averaging unit, and an output, wherein the subtraction unit generates and provides at its output, corrections signals corresponding to differences between the measured DC offset of each partial converted digital signal provided at the output of the ADC and the average value of the measured DC offsets of the respective partial converted digital signals provided by the averaging unit, and a compensation unit having a signal input connected to the output of the composite ADC, a correction input connected to the output of the subtraction unit, and an output, wherein the compensation unit subtracts the corrections signals at the correction input from the corresponding partial converted digital signals at the signal input, thereby providing at the output of the compensation unit, a sequence of digital samples at the system sampling rate S corresponding to all portions of the analog signal and characterized by substantially no DC offset mismatch for the respective portions of the analog signal.