Dithering techniques for analog-to-digital converters

An analog-to-digital converter (ADC) comprising:

• first ADC circuitry having an input and an output;
• second ADC circuitry having an input and an output;
• and
• dither circuitry including:
• first circuitry configured to produce a first dithered input signal at a first output coupled to the input of the first ADC circuitry, and to produce a second dithered input signal at a second output coupled to the input of the second ADC circuitry, the first dithered input signal based on a first dither signal, the second dithered input signal based on a second dither signal having an opposite sign relative to the first dither signal based on a condition;
• second circuitry having a first input coupled to the output of the first ADC circuitry, having a second input coupled to the output of the second ADC circuitry, having a first output to provide an adjusted first output signal based on the output of the first ADC circuitry, and having a second output to provide an adjusted second output signal based on the output of the second ADC circuitry;
• and
• third circuitry having a first input coupled to the first output of the second circuitry, having a second input coupled to the second output of the second circuitry, and having an output, the third circuitry configured to provide one of the adjusted first output signal, the adjusted second output signal or a combination of the adjusted first output signal and the adjusted second output signal at the output of the third circuitry.

An analog-to-digital converter (ADC) comprising:

• first ADC circuitry having an input and an output;
• second ADC circuitry having an input and an output;
• and
• dither circuitry including:
• first circuitry configured to produce a first dithered input signal at a first output coupled to the input of the first ADC circuitry, and to produce a second dithered input signal at a second output coupled to the input of the second ADC circuitry, the first dithered input signal based on a first dither signal, the second dithered input signal based on a second dither signal having an opposite sign relative to the first dither signal based on a condition;
• second circuitry having a first input coupled to the output of the first ADC circuitry, having a second input coupled to the output of the second ADC circuitry, having a first output to provide an adjusted first output signal based on the output of the first ADC circuitry, and having a second output to provide an adjusted second output signal based on the output of the second ADC circuitry;
• and
• third circuitry having a first input coupled to the first output of the second circuitry, having a second input coupled to the second output of the second circuitry, and having an output, the third circuitry configured to provide a weighted combination of the adjusted first output signal and the adjusted second output signal at the output of the third circuitry.

An analog-to-digital converter (ADC) comprising:

• first ADC circuitry having an input and an output;
• second ADC circuitry having an input and an output;
• and
• dither circuitry including:
• first circuitry having a first output, a second output, and an input, the first circuitry configured to provide a first dither signal at the first output and to provide a second dither signal at the second output, the first circuitry configured to generate the first dither signal and the second dither signal to have opposite signs based on a plurality of magnitude signals and a plurality of digital sequences;
• second circuitry having a first input coupled to the first output of the first circuitry, and having a second input coupled to the second output of the first circuitry, the second circuitry configured to produce a first dithered input signal at a first output coupled to the input of the first ADC circuitry, and to produce second dithered input signal at a second output coupled to the input of the second ADC circuitry, the first dithered input signal based on the first dither signal, the second dithered input signal based on the second dither signal;
• and
• third circuitry having an input, and having an output coupled to the input of the first circuitry, the third circuitry configured to determine a control signal based on a signal applied to the input, the third circuitry configured to output the control signal at the output, wherein the first circuitry is configured to set one or more values of the plurality of digital sequences based on the control signal.