Methods and apparatus to perform analog-to-digital conversions in a continuous time pipeline

An apparatus comprising:

• first analog-to-digital converter (ADC) circuitry having an input and an output;
• digital-to-analog converter (DAC) circuitry having an input and an output, the input of the DAC circuitry coupled to the output of the first ADC circuitry;
• first combination circuitry having a first input, a second input, and an output, the first input of the first combination circuitry coupled to the input of the first ADC circuitry, the second input of the first combination circuitry coupled to the output of the DAC circuitry;
• amplifier circuitry having an input and an output, the input of the amplifier circuitry coupled to the output of the first combination circuitry;
• second ADC circuitry having an input and an output, the input of the second ADC circuitry coupled to the output of the amplifier circuitry;
• and
• second combination circuitry having a first input and a second input, the first input of the second combination circuitry coupled to the output of the first ADC circuitry, the second input of the second combination circuitry coupled to the output of the second ADC circuitry.

An apparatus comprising:

• first analog-to-digital converter (ADC) circuitry;
• digital-to-analog converter (DAC) circuitry coupled to the first ADC circuitry;
• amplifier circuitry coupled to the DAC circuitry, the amplifier circuitry configured to amplify a residue by a gain, the residue is a difference between a first analog value and a second analog value;
• second ADC circuitry coupled to the amplifier circuitry;
• and
• combination circuitry coupled to first ADC circuitry and the second ADC circuitry, the combination circuitry configured to:
• multiply a first digital value by the gain to produce a combined digital value, the first digital value corresponds to the first analog value;
• combine a second digital value and the combined digital value, the second digital value corresponds to the residue;
• and
• generate a third digital value responsive to the combination of the second digital value and the combined digital value.