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

Claim 0:
1. A hybrid ADC device for converting an analog input signal into a digital output signal, the device comprising:
a first ADC circuit configured to receive the analog input signal and convert 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;

a DAC circuit configured to receive the first digital signal and convert it into a first analog signal;
a delay circuit configured to delay the analog input signal;
a first combiner configured to generate an analog residual signal by subtracting the first analog signal from the delayed analog input signal;
a second ADC circuit configured to receive the residual analog signal and convert it into a second digital signal;
a filter circuit configured to receive the first digital signal and output 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
a second combiner configured to generate the digital output signal by adding the second digital signal and the filtered first digital signal.