Patent ID: 11876524
Assignee: NXP B.V.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. A method of converting an analog input signal into a digital output signal, the method comprising:
receiving the analog input signal at a first ADC circuit and converting it into a first digital signal, the first ADC circuit comprising:
an SAR-based quantizer having an output for outputting the first digital signal,
an anti-aliasing filter having an output coupled to an input of the SAR-based quantizer, and

a feedback loop combiner having a first input coupled to receive the analog input signal,
a second input coupled to the output of the SAR-based quantizer, and an output coupled to an input of the anti-aliasing filter;
receiving the first digital signal at a DAC circuit and converting it into a first analog signal;
delaying the analog input signal utilizing a delay circuit;
generating an analog residual signal by subtracting the first analog signal from the delayed analog input signal in a first combiner;
receiving the residual analog signal at a second ADC circuit and converting it into a second digital signal;
receiving the first digital signal at a filter circuit and outputting a filtered first digital signal, the filter circuit having a transfer function corresponding to a combined transfer function of the DAC circuit and the second ADC circuit; and
generating the digital output signal by adding the second digital signal and the filtered first digital signal in a second combiner.