Patent ID: 8212700

Claim:
An Analog-to-Digital converter comprising: a Delta-Sigma-Delta modulator having a modulator input configured to receive an analog input signal (x(t)), and a modulator output configured to supply a digital signal (v(i)), the digital signal being a digital estimate (v(i)) of the analog input signal; wherein the Delta-Sigma-Delta modulator comprises: a comparator having a first input for receiving the analog input signal (x(t)), a second input for receiving an analog estimate (y(t)) of the analog input signal, and a comparator output, wherein the comparator output comprises a digital quantized tracking error signal (q(i)); a digital loop fitter coupled to the comparator output and responsive to the digital quantized tracking error signal (q(i)) for providing, on the modulator output, the digital estimate(v(i)) of the analog input signal; and a Sigma-Delta Digital-to-Analog Converter (DAC) configured to convert the digital estimate (v(i)) of the analog input signal into the analog estimate (y(t)) of the analog input signal.