Mixed chopping and correlated double sampling two-step analog-to-digital converter
AssigneeNXP USA, Inc.
InventorsKamlesh Singh, Vikram Varma
Life of this patent
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Abstract
A two-step, hybrid analog-to-digital converter (ADC) includes a Delta-Sigma ADC that employs chopping to resolve MSBs, a Nyquist ADC that employs correlated double sampling (CDS) to resolve LSBs, and a combiner that combines the MSBs and the LSBs to generate a digital output signal. The Delta-Sigma ADC has first and second integrators where, after resolving the MSBs, the first integrator is re-configured to function as a reference buffer for the Nyquist ADC and the second integrator is re-configured to function as the Nyquist ADC.
Claims13
A two-step, hybrid analog-to-digital converter (ADC) for converting an analog input signal into a digital output signal, the hybrid ADC comprising:
- a Delta-Sigma ADC that employs chopping to resolve one or more most-significant bits (MSBs) for the analog input signal;
- a Nyquist ADC that employs correlated double sampling (CDS) to resolve one or more least-significant bits (LSBs) for the analog input signal;
- and
- a combiner that combines the one or more MSBs and the one or more LSBs to generate the digital output signal.
A method for converting an analog input signal into a digital output signal, the method comprising:
- performing Delta-Sigma ADC processing with chopping to resolve one or more MSBs for the analog input signal;
- then performing Nyquist ADC processing using CDS to generate a reference voltage for the Nyquist ADC processing to resolve one or more LSBs for the analog input signal;
- and
- combining the one or more MSBs and the one or more LSBs to generate the digital output signal.
Dependencies are inferred from the claim text.