Patent ID: 7221302

Claim:
A method for calibrating a delta-sigma modulator, said method comprising: injecting a noise signal into a feedback loop of said delta-sigma modulator from a noise generator; measuring a response of a quantizer of said delta-sigma modulator to said noise signal over a number of samples by delaying said noise signal to provide a delayed noise signal, wherein said delaying comprises delaying said output of said noise generator with a multi-tap delay; correlating an output of said delta-sigma modulator with said delayed noise signal to obtain at least one impulse response term of a noise transfer function of said delta-sigma modulator and wherein said correlating is performed for each tap of said multi-tap delay simultaneously to determine terms of said impulse response of said noise transfer function; and adjusting coefficients of said delta-sigma modulator to shape said noise transfer function in conformity with a result of said measuring, so that said noise transfer function more closely approximates a desired transfer function, wherein said adjusting is performed in conformity with a result of said correlating.