Patent ID: 8508395
Filing Date: 2013-08-13
Classification: H03M

Abstract:
1. A method of reducing nonlinear distortions in a digitized signal generated by an analog-to-digital converter (ADC) when converting an analog input signal from analog to digital form, the method comprising: adding, to the analog input signal, a dither waveform adapted to suppress nonlinear distortions attributed to quantizer circuitry of the ADC during conversion of the analog input signal into a digitized signal, the dither waveform being substantially uncorrelated with the analog input signal and having a signal level that is approximately equal to or greater than a maximum signal level of the analog input signal; performing nonlinear equalization (NLEQ) on the digitized signal to suppress nonlinear distortions attributed to sample-and-hold (S/H) circuitry of the ADC during the conversion of the analog input signal into the digitized signal; and removing, from the digitized signal, a digital counterpart of the dither waveform added to the analog input signal.